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Dalghi MG, DuRie E, Ruiz WG, Clayton DR, Montalbetti N, Mutchler SB, Satlin LM, Kleyman TR, Carattino MD, Shi YS, Apodaca G. Expression and localization of the mechanosensitive/osmosensitive ion channel TMEM63B in the mouse urinary tract. Physiol Rep 2024; 12:e16043. [PMID: 38724885 PMCID: PMC11082094 DOI: 10.14814/phy2.16043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/23/2024] [Accepted: 04/23/2024] [Indexed: 05/12/2024] Open
Abstract
The epithelial cells that line the kidneys and lower urinary tract are exposed to mechanical forces including shear stress and wall tension; however, the mechanosensors that detect and respond to these stimuli remain obscure. Candidates include the OSCA/TMEM63 family of ion channels, which can function as mechanosensors and osmosensors. Using Tmem63bHA-fl/HA-fl reporter mice, we assessed the localization of HA-tagged-TMEM63B within the urinary tract by immunofluorescence coupled with confocal microscopy. In the kidneys, HA-TMEM63B was expressed by proximal tubule epithelial cells, by the intercalated cells of the collecting duct, and by the epithelial cells lining the thick ascending limb of the medulla. In the urinary tract, HA-TMEM63B was expressed by the urothelium lining the renal pelvis, ureters, bladder, and urethra. HA-TMEM63B was also expressed in closely allied organs including the epithelial cells lining the seminal vesicles, vas deferens, and lateral prostate glands of male mice and the vaginal epithelium of female mice. Our studies reveal that TMEM63B is expressed by subsets of kidney and lower urinary tract epithelial cells, which we hypothesize are sites of TMEM63B mechanosensation or osmosensation, or both.
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Affiliation(s)
- Marianela G. Dalghi
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Ella DuRie
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Wily G. Ruiz
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Dennis R. Clayton
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Nicolas Montalbetti
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Stephanie B. Mutchler
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Lisa M. Satlin
- Department of PediatricsIcahn School of Medicine at Mount SinaiNew YorkNew YorkUSA
| | - Thomas R. Kleyman
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of Cell BiologyUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of Chemical Biology & PharmacologyUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Marcelo D. Carattino
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of Cell BiologyUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Yun Stone Shi
- Ministry of Education Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Medical SchoolNanjing UniversityNanjingChina
| | - Gerard Apodaca
- Department of Medicine and George M. O'Brien Pittsburgh Center for Kidney ResearchUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of Cell BiologyUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
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2
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Kincheloe GN, Roberson PA, Jefferson LS, Kimball SR. Tissue-specific expression differences in Ras-related GTP-binding proteins in male rats. Physiol Rep 2024; 12:e15928. [PMID: 38296461 PMCID: PMC10830385 DOI: 10.14814/phy2.15928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/30/2023] [Accepted: 01/14/2024] [Indexed: 02/05/2024] Open
Abstract
The protein kinase Mechanistic Target of Rapamycin (mTOR) in Complex 1 (mTORC1) is regulated in part by the Ras-related GTP-binding proteins (Rag GTPases). Rag GTPases form a heterodimeric complex consisting of either RagA or RagB associated with either RagC or RagD and act to localize mTORC1 to the lysosomal membrane. Until recently, RagA and RagB were thought to be functionally redundant, as were RagC and RagD. However, recent research suggests that the various isoforms differentially activate mTORC1. Here, the mRNA expression and protein abundance of the Rag GTPases was compared across male rat skeletal muscle, heart, liver, kidney, and brain. Whereas mRNA expression of RagA was higher than RagB in nearly all tissues studied, RagB protein abundance was higher than RagA in all tissues besides skeletal muscle. RagC mRNA expression was more abundant or equal to RagD mRNA, and RagD protein was more abundant than RagC protein in all tissues. Moreover, the proportion of RagB in the short isoform was greater than the long in liver, whereas the opposite was true in brain. These results serve to further elucidate Rag GTPase expression and offer potential explanations for the differential responses to amino acids that are observed in different tissues.
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Affiliation(s)
- Gregory N. Kincheloe
- Department of Cellular and Molecular PhysiologyPenn State College of MedicineHersheyPennsylvaniaUSA
- Present address:
Department of AnatomyUCSF College of MedicineSan FranciscoCaliforniaUSA
| | - Paul A. Roberson
- Department of Cellular and Molecular PhysiologyPenn State College of MedicineHersheyPennsylvaniaUSA
- Present address:
Division of Endocrinology, Metabolism, Diabetes, Department of MedicineUniversity of Colorado – Anschutz Medical CampusAuroraColoradoUSA
| | - Leonard S. Jefferson
- Department of Cellular and Molecular PhysiologyPenn State College of MedicineHersheyPennsylvaniaUSA
| | - Scot R. Kimball
- Department of Cellular and Molecular PhysiologyPenn State College of MedicineHersheyPennsylvaniaUSA
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3
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Williamson A, da Silva A, do Carmo JM, Le Maitre C, Hall JE, Aberdein N. Impact of leptin deficiency on male tibia and vertebral body 3D bone architecture independent of changes in body weight. Physiol Rep 2023; 11:10.14814/phy2.15832. [PMID: 37786973 PMCID: PMC10546263 DOI: 10.14814/phy2.15832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 09/12/2023] [Accepted: 09/12/2023] [Indexed: 10/04/2023] Open
Abstract
Leptin an adipokine with potent effects on energy balance and body weight plays an important role in defining bone architecture in growing mammals. However, major changes in body weight can also influence morphology of trabecular and cortical bone. Therefore, we examined the impact of leptin deficiency on tibia and vertebral body 3D bone architecture independent of changes in body weight. Furthermore, advances in computational 3D image analysis suggest that average morphological values may mask regional specific differences in trabecular bone thickness. The study utilized leptin-deficient Ob/Ob mice (n = 8) weight-paired to C57BL/6 (C57) control mice (n = 8) which were split into either lean or obese groups for 24 ± 2 weeks. Whole tibias and L3 vertebrae were fixed before high resolution microcomputed tomography (μCT) scanning was performed. Leptin deficiency independent of body weight reduced tibia cortical bone volume, trabecular bone volume/tissue volume, number, and mineral density. Mean tibia trabecular thickness showed no significant differences between all groups; however, significant changes in trabecular thickness were found when analyzed by region. This study demonstrates that leptin deficiency significantly impacts tibia and vertebral body trabecular and cortical bone 3D architecture independent of changes in body weight.
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Affiliation(s)
- Alexander Williamson
- Biomolecular Science Research Centre, Department of Bioscience and ChemistrySheffield Hallam UniversitySheffieldUK
| | - Alexandre da Silva
- Mississippi Center for Obesity Research, Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMississippiUSA
| | - Jussara M. do Carmo
- Mississippi Center for Obesity Research, Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMississippiUSA
| | - Christine L. Le Maitre
- Biomolecular Science Research Centre, Department of Bioscience and ChemistrySheffield Hallam UniversitySheffieldUK
| | - John E. Hall
- Mississippi Center for Obesity Research, Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMississippiUSA
| | - Nicola Aberdein
- Biomolecular Science Research Centre, Department of Bioscience and ChemistrySheffield Hallam UniversitySheffieldUK
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Joseph I, Flores J, Farrell V, Davis J, Bianchi‐Smak J, Feng Q, Goswami S, Lin X, Wei Z, Tong K, Feng Z, Verzi MP, Bonder EM, Goldenring JR, Gao N. RAB11A and RAB11B control mitotic spindle function in intestinal epithelial progenitor cells. EMBO Rep 2023; 24:e56240. [PMID: 37424454 PMCID: PMC10481667 DOI: 10.15252/embr.202256240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 06/20/2023] [Accepted: 06/27/2023] [Indexed: 07/11/2023] Open
Abstract
RAB11 small GTPases and associated recycling endosome have been localized to mitotic spindles and implicated in regulating mitosis. However, the physiological significance of such regulation has not been observed in mammalian tissues. We have used newly engineered mouse models to investigate intestinal epithelial renewal in the absence of single or double isoforms of RAB11 family members: Rab11a and Rab11b. Comparing with single knockouts, mice with compound ablation demonstrate a defective cell cycle entry and robust mitotic arrest followed by apoptosis, leading to a total penetrance of lethality within 3 days of gene ablation. Upon Rab11 deletion ex vivo, enteroids show abnormal mitotic spindle formation and cell death. Untargeted proteomic profiling of Rab11a and Rab11b immunoprecipitates has uncovered a shared interactome containing mitotic spindle microtubule regulators. Disrupting Rab11 alters kinesin motor KIF11 function and impairs bipolar spindle formation and cell division. These data demonstrate that RAB11A and RAB11B redundantly control mitotic spindle function and intestinal progenitor cell division, a mechanism that may be utilized to govern the homeostasis and renewal of other mammalian tissues.
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Affiliation(s)
- Ivor Joseph
- Department of Biological SciencesRutgers UniversityNewarkNJUSA
| | - Juan Flores
- Department of Biological SciencesRutgers UniversityNewarkNJUSA
| | | | - Justin Davis
- Department of Biological SciencesRutgers UniversityNewarkNJUSA
| | | | - Qiang Feng
- Department of Biological SciencesRutgers UniversityNewarkNJUSA
| | | | - Xiang Lin
- Department of Computer SciencesNew Jersey Institute of TechnologyNewarkNJUSA
| | - Zhi Wei
- Department of Computer SciencesNew Jersey Institute of TechnologyNewarkNJUSA
| | - Kevin Tong
- Department of GeneticsRutgers UniversityNew BrunswickNJUSA
| | - Zhaohui Feng
- Rutgers Cancer Institute of New JerseyNew BrunswickNJUSA
| | | | - Edward M Bonder
- Department of Biological SciencesRutgers UniversityNewarkNJUSA
| | - James R Goldenring
- Section of Surgical Sciences and Epithelial Biology CenterVanderbilt University Medical CenterNashvilleTNUSA
| | - Nan Gao
- Department of Biological SciencesRutgers UniversityNewarkNJUSA
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5
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Delgado Spicuzza JM, Proctor DN, Thijssen DHJ, Somani YB. Menopausal stage differences in endothelial resistance to ischemia-reperfusion injury. Physiol Rep 2023; 11:e15768. [PMID: 37734868 PMCID: PMC10513907 DOI: 10.14814/phy2.15768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 06/25/2023] [Indexed: 09/23/2023] Open
Abstract
BACKGROUND In postmenopausal women, reduced ovarian function precedes endothelial dysfunction and attenuated endothelial resistance to ischemia-reperfusion (IR) injury. We hypothesized that IR injury would lower endothelial function, with premenopausal women demonstrating the greatest protection from injury, followed by early, then late postmenopausal women. METHODS Flow-mediated dilation (FMD) was assessed at baseline and following IR injury in premenopausal (n = 11), early (n = 11; 4 ± 1.6 years since menopause), and late (n = 11; 15 ± 5.5 years since menopause) postmenopausal women. RESULTS There were significant group differences in baseline FMD (p = 0.007); post hoc analysis revealed a similar resting FMD between premenopausal (7.8% ± 2.1%) and early postmenopausal (7.1% ± 2.7%), but significantly lower FMD in late postmenopausal women (4.5% ± 2.3%). Results showed an overall decline in FMD after IR injury (p < 0.001), and a significant condition*time interaction (p = 0.048), with early postmenopausal women demonstrating the most significant decline in FMD following IR. CONCLUSION Our findings indicate that endothelial resistance to IR injury is attenuated in healthy early postmenopausal women.
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Affiliation(s)
- Jocelyn M. Delgado Spicuzza
- Integrative and Biomedical Physiology, Huck Life SciencesThe Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA
| | - David N. Proctor
- Integrative and Biomedical Physiology, Huck Life SciencesThe Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA
- Kinesiology DepartmentThe Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA
| | - Dick H. J. Thijssen
- Research Institute of Sport and Exercise ScienceLiverpool John Moores UniversityLiverpoolUK
- Radboud Institute of Health Sciences, Department of PhysiologyRadboud University Medical CenterNijmegenThe Netherlands
| | - Yasina B. Somani
- Research Institute of Sport and Exercise ScienceLiverpool John Moores UniversityLiverpoolUK
- School of Biomedical Sciences, Faculty of Biological SciencesUniversity of LeedsLeedsUK
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6
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Wang Y, Lifshitz L, Silverstein NJ, Mintzer E, Luk K, StLouis P, Brehm MA, Wolfe SA, Deeks SG, Luban J. Transcriptional and chromatin profiling of human blood innate lymphoid cell subsets sheds light on HIV-1 pathogenesis. EMBO J 2023; 42:e114153. [PMID: 37382276 PMCID: PMC10425848 DOI: 10.15252/embj.2023114153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/30/2023] [Accepted: 06/12/2023] [Indexed: 06/30/2023] Open
Abstract
Innate lymphoid cells (ILCs) are a diverse population of cells that include NK cells and contribute to tissue homeostasis and repair, inflammation, and provide protection from infection. The interplay between human blood ILCs, as well as their responses to HIV-1 infection, remains poorly understood. This study used transcriptional and chromatin profiling to explore these questions. Transcriptional profiling and flow cytometry analysis support that there are four main ILC subsets found in human blood. Unlike in mice, human NK cells expressed the tissue repair protein amphiregulin (AREG). AREG production was induced by TCF7/WNT, IL-2, and IL-15, and inhibited by TGFB1, a cytokine increased in people living with HIV-1. In HIV-1 infection, the percentage of AREG+ NK cells correlated positively with the numbers of ILCs and CD4+ T cells but negatively with the concentration of inflammatory cytokine IL-6. NK-cell knockout of the TGFB1-stimulated WNT antagonist RUNX3 increased AREG production. Antiviral gene expression was increased in all ILC subsets from HIV-1 viremic people, and anti-inflammatory gene MYDGF was increased in an NK-cell subset from HIV-1-infected people whose viral load was undetectable in the absence of antiretroviral therapy. The percentage of defective NK cells in people living with HIV-1 correlated inversely with ILC percentage and CD4+ T-cell counts. CD4+ T cells and their production of IL-2 prevented the loss of NK-cell function by activating mTOR. These studies clarify how ILC subsets are interrelated and provide insight into how HIV-1 infection disrupts NK cells, including an uncharacterized homeostatic function in NK cells.
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Affiliation(s)
- Yetao Wang
- Hospital for Skin Diseases (Institute of Dermatology)Chinese Academy of Medical Sciences and Peking Union Medical CollegeNanjingChina
- Key Laboratory of Basic and Translational Research on Immune‐Mediated Skin DiseasesChinese Academy of Medical SciencesNanjingChina
- Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Institute of DermatologyChinese Academy of Medical Sciences and Peking Union Medical CollegeNanjingChina
- Program in Molecular MedicineUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Lawrence Lifshitz
- Program in Molecular MedicineUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Noah J Silverstein
- Program in Molecular MedicineUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Esther Mintzer
- Department of Molecular, Cell and Cancer BiologyUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Kevin Luk
- Department of Molecular, Cell and Cancer BiologyUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Pamela StLouis
- Diabetes Center of ExcellenceUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Michael A Brehm
- Diabetes Center of ExcellenceUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Scot A Wolfe
- Department of Molecular, Cell and Cancer BiologyUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Steven G Deeks
- Department of MedicineUniversity of CaliforniaSan FranciscoCAUSA
| | - Jeremy Luban
- Program in Molecular MedicineUniversity of Massachusetts Medical SchoolWorcesterMAUSA
- Department of Biochemistry and Molecular BiotechnologyUniversity of Massachusetts Medical SchoolWorcesterMAUSA
- Broad Institute of MIT and HarvardCambridgeMAUSA
- Ragon Institute of MGH, MIT, and HarvardCambridgeMAUSA
- Massachusetts Consortium on Pathogen ReadinessBostonMAUSA
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7
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Seifert EL, Hajnóczky G. Fuel oxidation under the control of mitochondrial shape and dynamics. EMBO J 2023; 42:e114129. [PMID: 37154272 PMCID: PMC10233371 DOI: 10.15252/embj.2023114129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 03/31/2023] [Indexed: 05/10/2023] Open
Abstract
How mitochondrial shape and substrate-specific metabolism are related has been a difficult question to address. Here, new work by Ngo et al (2023) reports that mitochondrial shape-long versus fragmented-determines the activity of β-oxidation of long-chain fatty acids, supporting a novel role for mitochondrial fission products as β-oxidation hubs.
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Affiliation(s)
- Erin L Seifert
- MitoCare Center, Department of Pathology and Genomic MedicineThomas Jefferson UniversityPhiladelphiaPAUSA
| | - György Hajnóczky
- MitoCare Center, Department of Pathology and Genomic MedicineThomas Jefferson UniversityPhiladelphiaPAUSA
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8
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Pham D, Silberger DJ, Nguyen KN, Gao M, Weaver CT, Hatton RD. Batf stabilizes Th17 cell development via impaired Stat5 recruitment of Ets1-Runx1 complexes. EMBO J 2023; 42:e109803. [PMID: 36917143 PMCID: PMC10106990 DOI: 10.15252/embj.2021109803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 01/13/2023] [Accepted: 01/19/2023] [Indexed: 03/16/2023] Open
Abstract
Although the activator protein-1 (AP-1) factor Batf is required for Th17 cell development, its mechanisms of action to underpin the Th17 program are incompletely understood. Here, we find that Batf ensures Th17 cell identity in part by restricting alternative gene programs through its actions to restrain IL-2 expression and IL-2-induced Stat5 activation. This, in turn, limits Stat5-dependent recruitment of Ets1-Runx1 factors to Th1- and Treg-cell-specific gene loci. Thus, in addition to pioneering regulatory elements in Th17-specific loci, Batf acts indirectly to inhibit the assembly of a Stat5-Ets1-Runx1 complex that enhances the transcription of Th1- and Treg-cell-specific genes. These findings unveil an important role for Stat5-Ets1-Runx1 interactions in transcriptional networks that define alternate T cell fates and indicate that Batf plays an indispensable role in both inducing and maintaining the Th17 program through its actions to regulate the competing actions of Stat5-assembled enhanceosomes that promote Th1- and Treg-cell developmental programs.
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Affiliation(s)
- Duy Pham
- Department of PathologyUniversity of Alabama at BirminghamBirminghamALUSA
| | - Daniel J Silberger
- Department of PathologyUniversity of Alabama at BirminghamBirminghamALUSA
| | - Kim N Nguyen
- Department of PathologyUniversity of Alabama at BirminghamBirminghamALUSA
| | - Min Gao
- Informatics InstituteUniversity of Alabama at BirminghamBirminghamALUSA
| | - Casey T Weaver
- Department of PathologyUniversity of Alabama at BirminghamBirminghamALUSA
| | - Robin D Hatton
- Department of PathologyUniversity of Alabama at BirminghamBirminghamALUSA
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Radyk MD, Spatz LB, Peña BL, Brown JW, Burclaff J, Cho CJ, Kefalov Y, Shih C, Fitzpatrick JAJ, Mills JC. ATF3 induces RAB7 to govern autodegradation in paligenosis, a conserved cell plasticity program. EMBO Rep 2021; 22:e51806. [PMID: 34309175 PMCID: PMC8419698 DOI: 10.15252/embr.202051806] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 06/04/2021] [Accepted: 06/18/2021] [Indexed: 12/20/2022] Open
Abstract
Differentiated cells across multiple species and organs can re-enter the cell cycle to aid in injury-induced tissue regeneration by a cellular program called paligenosis. Here, we show that activating transcription factor 3 (ATF3) is induced early during paligenosis in multiple cellular contexts, transcriptionally activating the lysosomal trafficking gene Rab7b. ATF3 and RAB7B are upregulated in gastric and pancreatic digestive-enzyme-secreting cells at the onset of paligenosis Stage 1, when cells massively induce autophagic and lysosomal machinery to dismantle differentiated cell morphological features. Their expression later ebbs before cells enter mitosis during Stage 3. Atf3-/- mice fail to induce RAB7-positive autophagic and lysosomal vesicles, eventually causing increased death of cells en route to Stage 3. Finally, we observe that ATF3 is expressed in human gastric metaplasia and during paligenotic injury across multiple other organs and species. Thus, our findings indicate ATF3 is an evolutionarily conserved gene orchestrating the early paligenotic autodegradative events that must occur before cells are poised to proliferate and contribute to tissue repair.
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Affiliation(s)
- Megan D Radyk
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Lillian B Spatz
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Bianca L Peña
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Jeffrey W Brown
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Joseph Burclaff
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Charles J Cho
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Yan Kefalov
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
| | - Chien‐Cheng Shih
- Washington University Center for Cellular ImagingWashington University School of MedicineSt. LouisMOUSA
| | - James AJ Fitzpatrick
- Washington University Center for Cellular ImagingWashington University School of MedicineSt. LouisMOUSA
- Departments of Neuroscience and Cell Biology & PhysiologyWashington University School of MedicineSt. LouisMOUSA
- Department of Biomedical EngineeringWashington University in St. LouisSt. LouisMOUSA
| | - Jason C Mills
- Division of GastroenterologyDepartment of MedicineWashington University School of MedicineSt. LouisMOUSA
- Department of Developmental BiologyWashington University School of MedicineSt. LouisMOUSA
- Department of Pathology and ImmunologyWashington University School of MedicineSt. LouisMOUSA
- Present address:
Section of Gastroenterology and HepatologyDepartments of Medicine and PathologyBaylor College of MedicineHoustonTXUSA
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10
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Traughber CA, Opoku E, Brubaker G, Major J, Lu H, Lorkowski SW, Neumann C, Hardaway A, Chung YM, Gulshan K, Sharifi N, Brown JM, Smith JD. Uptake of high-density lipoprotein by scavenger receptor class B type 1 is associated with prostate cancer proliferation and tumor progression in mice. J Biol Chem 2020; 295:8252-8261. [PMID: 32358065 PMCID: PMC7294086 DOI: 10.1074/jbc.ra120.013694] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/28/2020] [Indexed: 12/30/2022] Open
Abstract
High-density lipoprotein (HDL) metabolism is facilitated in part by scavenger receptor class B, type 1 (SR-B1) that mediates HDL uptake into cells. Higher levels of HDL have been associated with protection in other diseases, however, its role in prostate cancer is not definitive. SR-B1 is up-regulated in prostate cancer tissue, suggesting a possible role of this receptor in tumor progression. Here, we report that knockout (KO) of SR-B1 in both human and mouse prostate cancer cell lines through CRISPR/Cas9-mediated genome editing reduces HDL uptake into the prostate cancer cells and reduces their proliferation in response to HDL. In vivo studies using syngeneic SR-B1 WT (SR-B1+/+) and SR-B1 KO (SR-B1-/-) prostate cancer cells in WT and apolipoprotein-AI KO (apoA1-KO) C57BL/6J mice revealed that WT hosts, containing higher levels of total and HDL-cholesterol, grew larger tumors than apoA1-KO hosts with lower levels of total and HDL-cholesterol. Furthermore, SR-B1-/- prostate cancer cells formed smaller tumors in WT hosts than SR-B1+/+ cells in the same host model. Increased tumor volume was overall associated with reduced survival. We conclude that knocking out SR-B1 in prostate cancer tumors reduces HDL-associated increases in prostate cancer cell proliferation and disease progression.
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Affiliation(s)
- C Alicia Traughber
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Emmanuel Opoku
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Gregory Brubaker
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Jennifer Major
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Hanxu Lu
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Shuhui Wang Lorkowski
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Chase Neumann
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Aimalie Hardaway
- Department of Cancer Biology, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Yoon-Mi Chung
- Department of Cancer Biology, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Kailash Gulshan
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Nima Sharifi
- Department of Cancer Biology, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - J Mark Brown
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
- Comprehensive Cancer Center, Case Western Reserve University, Cleveland, Ohio, USA
- Center for Microbiome and Human Health, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Jonathan D Smith
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
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11
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Archer CR, Enslow BT, Carver CM, Stockand JD. Phosphatidylinositol 4,5-bisphosphate directly interacts with the β and γ subunits of the sodium channel ENaC. J Biol Chem 2020; 295:7958-7969. [PMID: 32341072 PMCID: PMC7278353 DOI: 10.1074/jbc.ra120.012606] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 04/22/2020] [Indexed: 12/18/2022] Open
Abstract
The plasma membrane phospholipid phosphatidylinositol 4,5-bisphosphate (PIP2) regulates the activity of diverse ion channels to include the epithelial Na+ channel ENaC. Whether PIP2 regulation of ENaC is due to a direct phospholipid-protein interaction, remains obscure. To date, possible interaction of PIP2 with ENaC primarily has been tested indirectly through assays of channel function. A fragment-based biochemical analysis approach is used here to directly quantify possible PIP2-ENaC interactions. We find using the CIBN-CRY2 optogenetic dimerization system that the phosphoryl group positioned at carbon 5 of PIP2 is necessary for interaction with ENaC. Previous studies have implicated conserved basic residues in the cytosolic portions of β- and γ-ENaC subunits as being important for PIP2-ENaC interactions. To test this, we used synthetic peptides of these regions of β- and γ-ENaC. Steady-state intrinsic fluorescence spectroscopy demonstrated that phosphoinositides change the local conformation of the N terminus of β-ENaC, and two sites of γ-ENaC adjacent to the plasma membrane, suggesting direct interactions of PIP2 with these three regions. Microscale thermophoresis elaborated PIP2 interactions with the N termini of β- (Kd ∼5.2 μm) and γ-ENaC (Kd ∼13 μm). A weaker interaction site within the carboxyl terminus of γ-ENaC (Kd ∼800 μm) was also observed. These results support that PIP2 regulates ENaC activity by directly interacting with at least three distinct regions within the cytoplasmic domains of the channel that contain conserved basic residues. These interactions are probably electrostatic in nature, and are likely to bear a key structural role in support of channel activity.
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Affiliation(s)
- Crystal R Archer
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center, San Antonio, Texas, United States
| | - Benjamin T Enslow
- Division of Nephrology, Department of Medicine, University of Texas Health Science Center, San Antonio, Texas, United States
| | - Chase M Carver
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center, San Antonio, Texas, United States
| | - James D Stockand
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center, San Antonio, Texas, United States
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12
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Kang T, Boland BB, Jensen P, Alarcon C, Nawrocki A, Grimsby JS, Rhodes CJ, Larsen MR. Characterization of Signaling Pathways Associated with Pancreatic β-cell Adaptive Flexibility in Compensation of Obesity-linked Diabetes in db/db Mice. Mol Cell Proteomics 2020; 19:971-993. [PMID: 32265294 PMCID: PMC7261816 DOI: 10.1074/mcp.ra119.001882] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 03/03/2020] [Indexed: 12/20/2022] Open
Abstract
The onset of obesity-linked type 2 diabetes (T2D) is marked by an eventual failure in pancreatic β-cell function and mass that is no longer able to compensate for the inherent insulin resistance and increased metabolic load intrinsic to obesity. However, in a commonly used model of T2D, the db/db mouse, β-cells have an inbuilt adaptive flexibility enabling them to effectively adjust insulin production rates relative to the metabolic demand. Pancreatic β-cells from these animals have markedly reduced intracellular insulin stores, yet high rates of (pro)insulin secretion, together with a substantial increase in proinsulin biosynthesis highlighted by expanded rough endoplasmic reticulum and Golgi apparatus. However, when the metabolic overload and/or hyperglycemia is normalized, β-cells from db/db mice quickly restore their insulin stores and normalize secretory function. This demonstrates the β-cell's adaptive flexibility and indicates that therapeutic approaches applied to encourage β-cell rest are capable of restoring endogenous β-cell function. However, mechanisms that regulate β-cell adaptive flexibility are essentially unknown. To gain deeper mechanistic insight into the molecular events underlying β-cell adaptive flexibility in db/db β-cells, we conducted a combined proteomic and post-translational modification specific proteomic (PTMomics) approach on islets from db/db mice and wild-type controls (WT) with or without prior exposure to normal glucose levels. We identified differential modifications of proteins involved in redox homeostasis, protein refolding, K48-linked deubiquitination, mRNA/protein export, focal adhesion, ERK1/2 signaling, and renin-angiotensin-aldosterone signaling, as well as sialyltransferase activity, associated with β-cell adaptive flexibility. These proteins are all related to proinsulin biosynthesis and processing, maturation of insulin secretory granules, and vesicular trafficking-core pathways involved in the adaptation of insulin production to meet metabolic demand. Collectively, this study outlines a novel and comprehensive global PTMome signaling map that highlights important molecular mechanisms related to the adaptive flexibility of β-cell function, providing improved insight into disease pathogenesis of T2D.
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Affiliation(s)
- Taewook Kang
- Protein research group, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark; The Danish Diabetes Academy, Odense, Denmark
| | - Brandon B Boland
- The Kovler Diabetes Center, Department of Medicine Section of Endocrinology, Diabetes & Metabolism, University of Chicago, Chicago, Illinois 60637; Cardiovascular, Renal and Metabolic Disease, BioPharmaceuticals Research and Development, AstraZeneca Gaithersburg, Maryland 20878
| | - Pia Jensen
- Protein research group, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Cristina Alarcon
- The Kovler Diabetes Center, Department of Medicine Section of Endocrinology, Diabetes & Metabolism, University of Chicago, Chicago, Illinois 60637
| | - Arkadiusz Nawrocki
- Protein research group, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Joseph S Grimsby
- Cardiovascular, Renal and Metabolic Disease, BioPharmaceuticals Research and Development, AstraZeneca Gaithersburg, Maryland 20878
| | - Christopher J Rhodes
- The Kovler Diabetes Center, Department of Medicine Section of Endocrinology, Diabetes & Metabolism, University of Chicago, Chicago, Illinois 60637; Cardiovascular, Renal and Metabolic Disease, BioPharmaceuticals Research and Development, AstraZeneca Gaithersburg, Maryland 20878
| | - Martin R Larsen
- Protein research group, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark.
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13
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Aggarwal G, Zarrow JE, Mashhadi Z, Flynn CR, Vinson P, Weaver CD, Davies SS. Symmetrically substituted dichlorophenes inhibit N-acyl-phosphatidylethanolamine phospholipase D. J Biol Chem 2020; 295:7289-7300. [PMID: 32284327 PMCID: PMC7247316 DOI: 10.1074/jbc.ra120.013362] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 04/06/2020] [Indexed: 01/09/2023] Open
Abstract
N-Acyl-phosphatidylethanolamine phospholipase D (NAPE-PLD) (EC 3.1.4.4) catalyzes the final step in the biosynthesis of N-acyl-ethanolamides. Reduced NAPE-PLD expression and activity may contribute to obesity and inflammation, but a lack of effective NAPE-PLD inhibitors has been a major obstacle to elucidating the role of NAPE-PLD and N-acyl-ethanolamide biosynthesis in these processes. The endogenous bile acid lithocholic acid (LCA) inhibits NAPE-PLD activity (with an IC50 of 68 μm), but LCA is also a highly potent ligand for TGR5 (EC50 0.52 μm). Recently, the first selective small-molecule inhibitor of NAPE-PLD, ARN19874, has been reported (having an IC50 of 34 μm). To identify more potent inhibitors of NAPE-PLD, here we used a quenched fluorescent NAPE analog, PED-A1, as a substrate for recombinant mouse Nape-pld to screen a panel of bile acids and a library of experimental compounds (the Spectrum Collection). Muricholic acids and several other bile acids inhibited Nape-pld with potency similar to that of LCA. We identified 14 potent Nape-pld inhibitors in the Spectrum Collection, with the two most potent (IC50 = ∼2 μm) being symmetrically substituted dichlorophenes, i.e. hexachlorophene and bithionol. Structure-activity relationship assays using additional substituted dichlorophenes identified key moieties needed for Nape-pld inhibition. Both hexachlorophene and bithionol exhibited significant selectivity for Nape-pld compared with nontarget lipase activities such as Streptomyces chromofuscus PLD or serum lipase. Both also effectively inhibited NAPE-PLD activity in cultured HEK293 cells. We conclude that symmetrically substituted dichlorophenes potently inhibit NAPE-PLD in cultured cells and have significant selectivity for NAPE-PLD versus other tissue-associated lipases.
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Affiliation(s)
- Geetika Aggarwal
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232
| | - Jonah E Zarrow
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232
| | - Zahra Mashhadi
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232
| | - C Robb Flynn
- Division of Surgery, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232
| | - Paige Vinson
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232; Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, Tennessee 37232
| | - C David Weaver
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232; Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232
| | - Sean S Davies
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232; Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232; Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232.
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14
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Miyamoto S, Zhang G, Hall D, Oates PJ, Maity S, Madesh M, Han X, Sharma K. Restoring mitochondrial superoxide levels with elamipretide (MTP-131) protects db/db mice against progression of diabetic kidney disease. J Biol Chem 2020; 295:7249-7260. [PMID: 32277051 PMCID: PMC7247302 DOI: 10.1074/jbc.ra119.011110] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 04/03/2020] [Indexed: 01/14/2023] Open
Abstract
Exposure to chronic hyperglycemia because of diabetes mellitus can lead to development and progression of diabetic kidney disease (DKD). We recently reported that reduced superoxide production is associated with mitochondrial dysfunction in the kidneys of mouse models of type 1 DKD. We also demonstrated that humans with DKD have significantly reduced levels of mitochondrion-derived metabolites in their urine. Here we examined renal superoxide production in a type 2 diabetes animal model, the db/db mouse, and the role of a mitochondrial protectant, MTP-131 (also called elamipretide, SS-31, or Bendavia) in restoring renal superoxide production and ameliorating DKD. We found that 18-week-old db/db mice have reduced renal and cardiac superoxide levels, as measured by dihydroethidium oxidation, and increased levels of albuminuria, mesangial matrix accumulation, and urinary H2O2 Administration of MTP-131 significantly inhibited increases in albuminuria, urinary H2O2, and mesangial matrix accumulation in db/db mice and fully preserved levels of renal superoxide production in these mice. MTP-131 also reduced total renal lysocardiolipin and major lysocardiolipin subspecies and preserved lysocardiolipin acyltransferase 1 expression in db/db mice. These results indicate that, in type 2 diabetes, DKD is associated with reduced renal and cardiac superoxide levels and that MTP-131 protects against DKD and preserves physiological superoxide levels, possibly by regulating cardiolipin remodeling.
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Affiliation(s)
- Satoshi Miyamoto
- Center for Renal Translational Medicine, Division of Nephrology-Hypertension, University of California, San Diego, La Jolla, California 92093; Division of Nephrology-Hypertension, Veterans Affairs San Diego Healthcare System, La Jolla, California 92093
| | - Guanshi Zhang
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, University of Texas Health San Antonio, San Antonio, Texas 78229; Audie L. Murphy Memorial Veterans Affairs Hospital, South Texas Veterans Health Care System, San Antonio, Texas 78229
| | - David Hall
- Institute of Engineering in Medicine, University of California, San Diego, La Jolla, California 92093
| | - Peter J Oates
- Oates Biomedical Consulting, LLC, Old Lyme, Connecticut 06371
| | - Soumya Maity
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, University of Texas Health San Antonio, San Antonio, Texas 78229
| | - Muniswamy Madesh
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, University of Texas Health San Antonio, San Antonio, Texas 78229
| | - Xianlin Han
- Division of Diabetes, Department of Medicine, University of Texas Health San Antonio, San Antonio, Texas 78229
| | - Kumar Sharma
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, University of Texas Health San Antonio, San Antonio, Texas 78229; Audie L. Murphy Memorial Veterans Affairs Hospital, South Texas Veterans Health Care System, San Antonio, Texas 78229.
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15
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Wang Q, Henry TAN, Pronin AN, Jang GF, Lubaczeuski C, Crabb JW, Bernal-Mizrachi E, Slepak VZ. The regulatory G protein signaling complex, Gβ5-R7, promotes glucose- and extracellular signal-stimulated insulin secretion. J Biol Chem 2020; 295:7213-7223. [PMID: 32229584 PMCID: PMC7247291 DOI: 10.1074/jbc.ra119.011534] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 03/05/2020] [Indexed: 12/29/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are important modulators of glucose-stimulated insulin secretion, essential for maintaining energy homeostasis. Here we investigated the role of Gβ5-R7, a protein complex consisting of the atypical G protein β subunit Gβ5 and a regulator of G protein signaling of the R7 family. Using the mouse insulinoma MIN6 cell line and pancreatic islets, we investigated the effects of G protein subunit β 5 (Gnb5) knockout on insulin secretion. Consistent with previous work, Gnb5 knockout diminished insulin secretion evoked by the muscarinic cholinergic agonist Oxo-M. We found that the Gnb5 knockout also attenuated the activity of other GPCR agonists, including ADP, arginine vasopressin, glucagon-like peptide 1, and forskolin, and, surprisingly, the response to high glucose. Experiments with MIN6 cells cultured at different densities provided evidence that Gnb5 knockout eliminated the stimulatory effect of cell adhesion on Oxo-M-stimulated glucose-stimulated insulin secretion; this effect likely involved the adhesion GPCR GPR56. Gnb5 knockout did not influence cortical actin depolymerization but affected protein kinase C activity and the 14-3-3ϵ substrate. Importantly, Gnb5-/- islets or MIN6 cells had normal total insulin content and released normal insulin amounts in response to K+-evoked membrane depolarization. These results indicate that Gβ5-R7 plays a role in the insulin secretory pathway downstream of signaling via all GPCRs and glucose. We propose that the Gβ5-R7 complex regulates a phosphorylation event participating in the vesicular trafficking pathway downstream of G protein signaling and actin depolymerization but upstream of insulin granule release.
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Affiliation(s)
- Qiang Wang
- Department of Molecular and Cellular Pharmacology, University of Miami School of Medicine, Miami, Florida 33136
| | - Taylor A N Henry
- Department of Molecular and Cellular Pharmacology, University of Miami School of Medicine, Miami, Florida 33136
| | - Alexey N Pronin
- Department of Molecular and Cellular Pharmacology, University of Miami School of Medicine, Miami, Florida 33136
| | - Geeng-Fu Jang
- Cole Eye Institute and Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Camila Lubaczeuski
- Division of Endocrinology, Diabetes, and Metabolism, University of Miami School of Medicine, Miami, Florida 33136
| | - John W Crabb
- Cole Eye Institute and Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Ernesto Bernal-Mizrachi
- Division of Endocrinology, Diabetes, and Metabolism, University of Miami School of Medicine, Miami, Florida 33136
| | - Vladlen Z Slepak
- Department of Molecular and Cellular Pharmacology, University of Miami School of Medicine, Miami, Florida 33136.
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16
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Ray S, Chee L, Matson DR, Palermo NY, Bresnick EH, Hewitt KJ. Sterile α-motif domain requirement for cellular signaling and survival. J Biol Chem 2020; 295:7113-7125. [PMID: 32241909 PMCID: PMC7242717 DOI: 10.1074/jbc.ra119.011895] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 04/01/2020] [Indexed: 01/21/2023] Open
Abstract
Hundreds of sterile α-motif (SAM) domains have predicted structural similarities and are reported to bind proteins, lipids, or RNAs. However, the majority of these domains have not been analyzed functionally. Previously, we demonstrated that a SAM domain-containing protein, SAMD14, promotes SCF/proto-oncogene c-Kit (c-Kit) signaling, erythroid progenitor function, and erythrocyte regeneration. Deletion of a Samd14 enhancer (Samd14-Enh), occupied by GATA2 and SCL/TAL1 transcription factors, reduces SAMD14 expression in bone marrow and spleen and is lethal in a hemolytic anemia mouse model. To rigorously establish whether Samd14-Enh deletion reduces anemia-dependent c-Kit signaling by lowering SAMD14 levels, we developed a genetic rescue assay in murine Samd14-Enh-/- primary erythroid precursor cells. SAMD14 expression at endogenous levels rescued c-Kit signaling. The conserved SAM domain was required for SAMD14 to increase colony-forming activity, c-Kit signaling, and progenitor survival. To elucidate the molecular determinants of SAM domain function in SAMD14, we substituted its SAM domain with distinct SAM domains predicted to be structurally similar. The chimeras were less effective than SAMD14 itself in rescuing signaling, survival, and colony-forming activities. Thus, the SAMD14 SAM domain has attributes that are distinct from other SAM domains and underlie SAMD14 function as a regulator of cellular signaling and erythrocyte regeneration.
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Affiliation(s)
- Suhita Ray
- Department of Genetics, Cell Biology and Anatomy, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Linda Chee
- Department of Genetics, Cell Biology and Anatomy, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Daniel R Matson
- University of Wisconsin-Madison Blood Research Program, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53705
| | - Nick Y Palermo
- Holland Computing Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68588
| | - Emery H Bresnick
- University of Wisconsin-Madison Blood Research Program, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53705
| | - Kyle J Hewitt
- Department of Genetics, Cell Biology and Anatomy, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198
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17
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Schmider AB, Bauer NC, Sunwoo H, Godin MD, Ellis GE, Lee JT, Nigrovic PA, Soberman RJ. Two- and three-color STORM analysis reveals higher-order assembly of leukotriene synthetic complexes on the nuclear envelope of murine neutrophils. J Biol Chem 2020; 295:5761-5770. [PMID: 32152223 PMCID: PMC7186161 DOI: 10.1074/jbc.ra119.012069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 02/24/2020] [Indexed: 11/06/2022] Open
Abstract
Over the last several years it has become clear that higher order assemblies on membranes, exemplified by signalosomes, are a paradigm for the regulation of many membrane signaling processes. We have recently combined two-color direct stochastic optical reconstruction microscopy (dSTORM) with the (Clus-DoC) algorithm that combines cluster detection and colocalization analysis to observe the organization of 5-lipoxygenase (5-LO) and 5-lipoxygenase-activating protein (FLAP) into higher order assemblies on the nuclear envelope of mast cells; these assemblies were linked to leukotriene (LT) C4 production. In this study we investigated whether higher order assemblies of 5-LO and FLAP included cytosolic phospholipase A2 (cPLA2) and were linked to LTB4 production in murine neutrophils. Using two- and three-color dSTORM supported by fluorescence lifetime imaging microscopy we identified higher order assemblies containing 40 molecules (median) (IQR: 23, 87) of 5-LO, and 53 molecules (62, 156) of FLAP monomer. 98 (18, 154) molecules of cPLA2 were clustered with 5-LO, and 77 (33, 114) molecules of cPLA2 were associated with FLAP. These assemblies were tightly linked to LTB4 formation. The activation-dependent close associations of cPLA2, FLAP, and 5-LO in higher order assemblies on the nuclear envelope support a model in which arachidonic acid is generated by cPLA2 in apposition to FLAP, facilitating its transfer to 5-LO to initiate LT synthesis.
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Affiliation(s)
- Angela B Schmider
- Nephrology Division, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129
| | - Nicholas C Bauer
- Nephrology Division, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129
| | - Hongjae Sunwoo
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114
| | - Matthew D Godin
- Nephrology Division, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129
| | - Giorgianna E Ellis
- Nephrology Division, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129
| | - Jeannie T Lee
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114; Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
| | - Peter A Nigrovic
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, Massachusetts 02115
| | - Roy J Soberman
- Nephrology Division, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129.
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18
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Lear TB, Lockwood KC, Larsen M, Tuncer F, Kennerdell JR, Morse C, Valenzi E, Tabib T, Jurczak MJ, Kass DJ, Evankovich JW, Finkel T, Lafyatis R, Liu Y, Chen BB. Kelch-like protein 42 is a profibrotic ubiquitin E3 ligase involved in systemic sclerosis. J Biol Chem 2020; 295:4171-4180. [PMID: 32071084 PMCID: PMC7105301 DOI: 10.1074/jbc.ac119.012066] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 02/07/2020] [Indexed: 01/08/2023] Open
Abstract
Systemic scleroderma (SSc) is an autoimmune disease that affects over 2.5 million people globally. SSc results in dysfunctional connective tissues with excessive profibrotic signaling, affecting skin, cardiovascular, and particularly lung tissue. Over three-quarters of individuals with SSc develop pulmonary fibrosis within 5 years, the main cause of SSc mortality. No approved medicines to manage lung SSc currently exist. Recent research suggests that profibrotic signaling by transforming growth factor β (TGF-β) is directly tied to SSc. Previous studies have also shown that ubiquitin E3 ligases potently control TGF-β signaling through targeted degradation of key regulatory proteins; however, the roles of these ligases in SSc-TGF-β signaling remain unclear. Here we utilized primary SSc patient lung cells for high-throughput screening of TGF-β signaling via high-content imaging of nuclear translocation of the profibrotic transcription factor SMAD family member 2/3 (SMAD2/3). We screened an RNAi library targeting ubiquitin E3 ligases and observed that knockdown of the E3 ligase Kelch-like protein 42 (KLHL42) impairs TGF-β-dependent profibrotic signaling. KLHL42 knockdown reduced fibrotic tissue production and decreased TGF-β-mediated SMAD activation. Using unbiased ubiquitin proteomics, we identified phosphatase 2 regulatory subunit B'ϵ (PPP2R5ϵ) as a KLHL42 substrate. Mechanistic experiments validated ubiquitin-mediated control of PPP2R5ϵ stability through KLHL42. PPP2R5ϵ knockdown exacerbated TGF-β-mediated profibrotic signaling, indicating a role of PPP2R5ϵ in SSc. Our findings indicate that the KLHL42-PPP2R5ϵ axis controls profibrotic signaling in SSc lung fibroblasts. We propose that future studies could investigate whether chemical inhibition of KLHL42 may ameliorate profibrotic signaling in SSc.
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Affiliation(s)
- Travis B Lear
- Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Karina C Lockwood
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Mads Larsen
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Ferhan Tuncer
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Jason R Kennerdell
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Christina Morse
- Division of Rheumatology and Clinical Immunology, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Eleanor Valenzi
- Division of Rheumatology and Clinical Immunology, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Tracy Tabib
- Division of Rheumatology and Clinical Immunology, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Michael J Jurczak
- Division of Endocrinology and Metabolism, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Daniel J Kass
- Dorothy P. and Richard P. Simmons Center for Interstitial Lung Disease, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - John W Evankovich
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; Acute Lung Injury Center of Excellence, Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Toren Finkel
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; Division of Cardiology, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Robert Lafyatis
- Division of Rheumatology and Clinical Immunology, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Yuan Liu
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; Acute Lung Injury Center of Excellence, Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213.
| | - Bill B Chen
- Aging Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; Acute Lung Injury Center of Excellence, Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; Vascular Medicine Institute, Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213.
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19
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Iqbal J, Mascareno E, Chua S, Hussain MM. Leptin-mediated differential regulation of microsomal triglyceride transfer protein in the intestine and liver affects plasma lipids. J Biol Chem 2020; 295:4101-4113. [PMID: 32047110 PMCID: PMC7105304 DOI: 10.1074/jbc.ra119.011881] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 02/06/2020] [Indexed: 11/06/2022] Open
Abstract
The hormone leptin regulates fat storage and metabolism by signaling through the brain and peripheral tissues. Lipids delivered to peripheral tissues originate mostly from the intestine and liver via synthesis and secretion of apolipoprotein B (apoB)-containing lipoproteins. An intracellular chaperone, microsomal triglyceride transfer protein (MTP), is required for the biosynthesis of these lipoproteins, and its regulation determines fat mobilization to different tissues. Using cell culture and animal models, here we sought to identify the effects of leptin on MTP expression in the intestine and liver. Leptin decreased MTP expression in differentiated intestinal Caco-2 cells, but increased expression in hepatic Huh7 cells. Similarly, acute and chronic leptin treatment of chow diet-fed WT mice decreased MTP expression in the intestine, increased it in the liver, and lowered plasma triglyceride levels. These leptin effects required the presence of leptin receptors (LEPRs). Further experiments also suggested that leptin interacted with long-form LEPR (ObRb), highly expressed in the intestine, to down-regulate MTP. In contrast, in the liver, leptin interacted with short-form LEPR (ObRa) to increase MTP expression. Mechanistic experiments disclosed that leptin activates signal transducer and activator of transcription 3 (STAT3) and mitogen-activated protein kinase (MAPK) signaling pathways in intestinal and hepatic cells, respectively, and thereby regulates divergent MTP expression. Our results also indicated that leptin-mediated MTP regulation in the intestine affects plasma lipid levels. In summary, our findings suggest that leptin regulates MTP expression differentially by engaging with different LEPR types and activating distinct signaling pathways in intestinal and hepatic cells.
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Affiliation(s)
- Jahangir Iqbal
- Department of Cell Biology, SUNY Downstate Medical Center, Brooklyn, New York 11203; King Abdullah International Medical Research Center, King Saud Bin Abdulaziz University for Health Sciences, Eastern Region, Ministry of National Guard Health Affairs, Al Ahsa 31982, Saudi Arabia.
| | - Eduardo Mascareno
- Department of Cell Biology, SUNY Downstate Medical Center, Brooklyn, New York 11203
| | - Streamson Chua
- Department of Medicine and Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461
| | - M Mahmood Hussain
- Department of Cell Biology, SUNY Downstate Medical Center, Brooklyn, New York 11203; Department of Foundations of Medicine, NYU Long Island School of Medicine and Diabetes and Obesity Research Center, NYU Winthrop Research Institute, Mineola, New York 11501; Veterans Affairs New York Harbor Healthcare System, Brooklyn, New York 11209.
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20
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Canalis E, Grossman TR, Carrer M, Schilling L, Yu J. Antisense oligonucleotides targeting Notch2 ameliorate the osteopenic phenotype in a mouse model of Hajdu-Cheney syndrome. J Biol Chem 2020; 295:3952-3964. [PMID: 31992595 PMCID: PMC7086019 DOI: 10.1074/jbc.ra119.011440] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 01/24/2020] [Indexed: 12/23/2022] Open
Abstract
Notch receptors play critical roles in cell-fate decisions and in the regulation of skeletal development and bone remodeling. Gain-of-function NOTCH2 mutations can cause Hajdu-Cheney syndrome, an untreatable disease characterized by osteoporosis and fractures, craniofacial developmental abnormalities, and acro-osteolysis. We have previously created a mouse model harboring a point 6955C→T mutation in the Notch2 locus upstream of the PEST domain, and we termed this model Notch2tm1.1Ecan Heterozygous Notch2tm1.1Ecan mutant mice exhibit severe cancellous and cortical bone osteopenia due to increased bone resorption. In this work, we demonstrate that the subcutaneous administration of Notch2 antisense oligonucleotides (ASO) down-regulates Notch2 and the Notch target genes Hes-related family basic helix-loop-helix transcription factor with YRPW motif 1 (Hey1), Hey2, and HeyL in skeletal tissue from Notch2tm1.1Ecan mice. Results of microcomputed tomography experiments indicated that the administration of Notch2 ASOs ameliorates the cancellous osteopenia of Notch2tm1.1Ecan mice, and bone histomorphometry analysis revealed decreased osteoclast numbers in Notch2 ASO-treated Notch2tm1.1Ecan mice. Notch2 ASOs decreased the induction of mRNA levels of TNF superfamily member 11 (Tnfsf11, encoding the osteoclastogenic protein RANKL) in cultured osteoblasts and osteocytes from Notch2tm1.1Ecan mice. Bone marrow-derived macrophage cultures from the Notch2tm1.1Ecan mice displayed enhanced osteoclastogenesis, which was suppressed by Notch2 ASOs. In conclusion, Notch2tm1.1Ecan mice exhibit cancellous bone osteopenia that can be ameliorated by systemic administration of Notch2 ASOs.
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Affiliation(s)
- Ernesto Canalis
- Department of Orthopaedic Surgery, UConn Health, Farmington, Connecticut 06030
- Department of Medicine, UConn Health, Farmington, Connecticut 06030
- UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut 06030
| | | | | | - Lauren Schilling
- UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut 06030
| | - Jungeun Yu
- Department of Orthopaedic Surgery, UConn Health, Farmington, Connecticut 06030
- UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut 06030
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21
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Li L, Bertram S, Kaplan J, Jia X, Ward DM. The mitochondrial iron exporter genes MMT1 and MMT2 in yeast are transcriptionally regulated by Aft1 and Yap1. J Biol Chem 2020; 295:1716-1726. [PMID: 31896574 PMCID: PMC7008362 DOI: 10.1074/jbc.ra119.011154] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/30/2019] [Indexed: 12/12/2022] Open
Abstract
Budding yeast (Saccharomyces cerevisiae) responds to low cytosolic iron by up-regulating the expression of iron import genes; iron import can reflect iron transport into the cytosol or mitochondria. Mmt1 and Mmt2 are nuclearly encoded mitochondrial proteins that export iron from the mitochondria into the cytosol. Here we report that MMT1 and MMT2 expression is transcriptionally regulated by two pathways: the low-iron-sensing transcription factor Aft1 and the oxidant-sensing transcription factor Yap1. We determined that MMT1 and MMT2 expression is increased under low-iron conditions and decreased when mitochondrial iron import is increased through overexpression of the high-affinity mitochondrial iron importer Mrs3. Moreover, loss of iron-sulfur cluster synthesis induced expression of MMT1 and MMT2 We show that exposure to the oxidant H2O2 induced MMT1 expression but not MMT2 expression and identified the transcription factor Yap1 as being involved in oxidant-mediated MMT1 expression. We defined Aft1- and Yap1-dependent transcriptional sites in the MMT1 promoter that are necessary for low-iron- or oxidant-mediated MMT1 expression. We also found that the MMT2 promoter contains domains that are important for regulating its expression under low-iron conditions, including an upstream region that appears to partially repress expression under low-iron conditions. Our findings reveal that MMT1 and MMT2 are induced under low-iron conditions and that the low-iron regulator Aft1 is required for this induction. We further uncover an Aft1-binding site in the MMT1 promoter sufficient for inducing MMT1 transcription and identify an MMT2 promoter region required for low iron induction.
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Affiliation(s)
- Liangtao Li
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah 84132
| | - Sophie Bertram
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah 84132
| | - Jerry Kaplan
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah 84132
| | - Xuan Jia
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah 84132
| | - Diane M Ward
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah 84132.
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22
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Azumaya CM, Linton EA, Risener CJ, Nakagawa T, Karakas E. Cryo-EM structure of human type-3 inositol triphosphate receptor reveals the presence of a self-binding peptide that acts as an antagonist. J Biol Chem 2020; 295:1743-1753. [PMID: 31915246 PMCID: PMC7008357 DOI: 10.1074/jbc.ra119.011570] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/06/2020] [Indexed: 01/04/2023] Open
Abstract
Calcium-mediated signaling through inositol 1,4,5-triphosphate receptors (IP3Rs) is essential for the regulation of numerous physiological processes, including fertilization, muscle contraction, apoptosis, secretion, and synaptic plasticity. Deregulation of IP3Rs leads to pathological calcium signaling and is implicated in many common diseases, including cancer and neurodegenerative, autoimmune, and metabolic diseases. Revealing the mechanism of activation and inhibition of this ion channel will be critical to an improved understanding of the biological processes that are controlled by IP3Rs. Here, we report structural findings of the human type-3 IP3R (IP3R-3) obtained by cryo-EM (at an overall resolution of 3.8 Å), revealing an unanticipated regulatory mechanism where a loop distantly located in the primary sequence occupies the IP3-binding site and competitively inhibits IP3 binding. We propose that this inhibitory mechanism must differ qualitatively among IP3R subtypes because of their diverse loop sequences, potentially serving as a key molecular determinant of subtype-specific calcium signaling in IP3Rs. In summary, our structural characterization of human IP3R-3 provides critical insights into the mechanistic function of IP3Rs and into subtype-specific regulation of these important calcium-regulatory channels.
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MESH Headings
- Binding Sites
- Calcium Signaling
- Cryoelectron Microscopy
- Humans
- Inositol 1,4,5-Trisphosphate/metabolism
- Inositol 1,4,5-Trisphosphate Receptors/antagonists & inhibitors
- Inositol 1,4,5-Trisphosphate Receptors/chemistry
- Inositol 1,4,5-Trisphosphate Receptors/metabolism
- Inositol 1,4,5-Trisphosphate Receptors/ultrastructure
- Models, Molecular
- Peptides/metabolism
- Protein Conformation
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Affiliation(s)
- Caleigh M Azumaya
- Department of Molecular Physiology and Biophysics, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232
| | - Emily A Linton
- Department of Molecular Physiology and Biophysics, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232
| | - Caitlin J Risener
- Department of Molecular Physiology and Biophysics, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232
| | - Terunaga Nakagawa
- Department of Molecular Physiology and Biophysics, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232; Center for Structural Biology, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232; Vanderbilt Brain Institute, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232
| | - Erkan Karakas
- Department of Molecular Physiology and Biophysics, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232; Center for Structural Biology, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232.
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23
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De Leoz MLA, Duewer DL, Fung A, Liu L, Yau HK, Potter O, Staples GO, Furuki K, Frenkel R, Hu Y, Sosic Z, Zhang P, Altmann F, Grunwald-Grube C, Shao C, Zaia J, Evers W, Pengelley S, Suckau D, Wiechmann A, Resemann A, Jabs W, Beck A, Froehlich JW, Huang C, Li Y, Liu Y, Sun S, Wang Y, Seo Y, An HJ, Reichardt NC, Ruiz JE, Archer-Hartmann S, Azadi P, Bell L, Lakos Z, An Y, Cipollo JF, Pucic-Bakovic M, Štambuk J, Lauc G, Li X, Wang PG, Bock A, Hennig R, Rapp E, Creskey M, Cyr TD, Nakano M, Sugiyama T, Leung PKA, Link-Lenczowski P, Jaworek J, Yang S, Zhang H, Kelly T, Klapoetke S, Cao R, Kim JY, Lee HK, Lee JY, Yoo JS, Kim SR, Suh SK, de Haan N, Falck D, Lageveen-Kammeijer GSM, Wuhrer M, Emery RJ, Kozak RP, Liew LP, Royle L, Urbanowicz PA, Packer NH, Song X, Everest-Dass A, Lattová E, Cajic S, Alagesan K, Kolarich D, Kasali T, Lindo V, Chen Y, Goswami K, Gau B, Amunugama R, Jones R, Stroop CJM, Kato K, Yagi H, Kondo S, Yuen CT, Harazono A, Shi X, Magnelli PE, Kasper BT, Mahal L, Harvey DJ, O'Flaherty R, Rudd PM, Saldova R, Hecht ES, Muddiman DC, Kang J, Bhoskar P, Menard D, Saati A, Merle C, Mast S, Tep S, Truong J, Nishikaze T, Sekiya S, Shafer A, Funaoka S, Toyoda M, de Vreugd P, Caron C, Pradhan P, Tan NC, Mechref Y, Patil S, Rohrer JS, Chakrabarti R, Dadke D, Lahori M, Zou C, Cairo C, Reiz B, Whittal RM, Lebrilla CB, Wu L, Guttman A, Szigeti M, Kremkow BG, Lee KH, Sihlbom C, Adamczyk B, Jin C, Karlsson NG, Örnros J, Larson G, Nilsson J, Meyer B, Wiegandt A, Komatsu E, Perreault H, Bodnar ED, Said N, Francois YN, Leize-Wagner E, Maier S, Zeck A, Heck AJR, Yang Y, Haselberg R, Yu YQ, Alley W, Leone JW, Yuan H, Stein SE. NIST Interlaboratory Study on Glycosylation Analysis of Monoclonal Antibodies: Comparison of Results from Diverse Analytical Methods. Mol Cell Proteomics 2020; 19:11-30. [PMID: 31591262 PMCID: PMC6944243 DOI: 10.1074/mcp.ra119.001677] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 08/26/2019] [Indexed: 01/24/2023] Open
Abstract
Glycosylation is a topic of intense current interest in the development of biopharmaceuticals because it is related to drug safety and efficacy. This work describes results of an interlaboratory study on the glycosylation of the Primary Sample (PS) of NISTmAb, a monoclonal antibody reference material. Seventy-six laboratories from industry, university, research, government, and hospital sectors in Europe, North America, Asia, and Australia submitted a total of 103 reports on glycan distributions. The principal objective of this study was to report and compare results for the full range of analytical methods presently used in the glycosylation analysis of mAbs. Therefore, participation was unrestricted, with laboratories choosing their own measurement techniques. Protein glycosylation was determined in various ways, including at the level of intact mAb, protein fragments, glycopeptides, or released glycans, using a wide variety of methods for derivatization, separation, identification, and quantification. Consequently, the diversity of results was enormous, with the number of glycan compositions identified by each laboratory ranging from 4 to 48. In total, one hundred sixteen glycan compositions were reported, of which 57 compositions could be assigned consensus abundance values. These consensus medians provide community-derived values for NISTmAb PS. Agreement with the consensus medians did not depend on the specific method or laboratory type. The study provides a view of the current state-of-the-art for biologic glycosylation measurement and suggests a clear need for harmonization of glycosylation analysis methods.
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Affiliation(s)
- Maria Lorna A De Leoz
- Mass Spectrometry Data Center, Biomolecular Measurement Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive Gaithersburg, Maryland 20899.
| | - David L Duewer
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive Gaithersburg, Maryland 20899
| | - Adam Fung
- Analytical Development, Agensys, Inc., 1800 Steward Street Santa Monica, California 90404
| | - Lily Liu
- Analytical Development, Agensys, Inc., 1800 Steward Street Santa Monica, California 90404
| | - Hoi Kei Yau
- Analytical Development, Agensys, Inc., 1800 Steward Street Santa Monica, California 90404
| | - Oscar Potter
- Agilent Technologies, Inc., 5301 Stevens Creek Blvd Santa Clara, California 95051
| | - Gregory O Staples
- Agilent Technologies, Inc., 5301 Stevens Creek Blvd Santa Clara, California 95051
| | - Kenichiro Furuki
- Astellas Pharma, 5-2-3 Tokodai, Tsukiba, Ibaraki, 300-2698, Japan
| | - Ruth Frenkel
- Analytical Development, Biogen, 14 Cambridge Center Cambridge, Massachusetts 02142
| | - Yunli Hu
- Analytical Development, Biogen, 14 Cambridge Center Cambridge, Massachusetts 02142
| | - Zoran Sosic
- Analytical Development, Biogen, 14 Cambridge Center Cambridge, Massachusetts 02142
| | - Peiqing Zhang
- Bioprocessing Technology Institute, 20 Biopolis Way, Level 3 Singapore 138668
| | - Friedrich Altmann
- Department of Chemistry, University of Natural Resources and Life Science, Vienna (BOKU), Muthgasse 18 1190 Wien, Austria
| | - Clemens Grunwald-Grube
- Department of Chemistry, University of Natural Resources and Life Science, Vienna (BOKU), Muthgasse 18 1190 Wien, Austria
| | - Chun Shao
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, 670 Albany Street Boston, Massachusetts 02118
| | - Joseph Zaia
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, 670 Albany Street Boston, Massachusetts 02118
| | - Waltraud Evers
- Bruker Daltonik GmbH, Fahrenheitstr. 4, 28359 Bremen, Germany
| | | | - Detlev Suckau
- Bruker Daltonik GmbH, Fahrenheitstr. 4, 28359 Bremen, Germany
| | - Anja Wiechmann
- Bruker Daltonik GmbH, Fahrenheitstr. 4, 28359 Bremen, Germany
| | - Anja Resemann
- Bruker Daltonik GmbH, Fahrenheitstr. 4, 28359 Bremen, Germany
| | - Wolfgang Jabs
- Bruker Daltonik GmbH, Fahrenheitstr. 4, 28359 Bremen, Germany; Department of Life Sciences & Technology, Beuth Hochschule für Technik Berlin, Seestraβe 64, 13347 Berlin, Germany
| | - Alain Beck
- Centre d'Immunologie Pierre Fabre, 5 Avenue Napoléon III, BP 60497, 74164 St Julien-en-Genevois, France
| | - John W Froehlich
- Department of Urology, Boston Children's Hospital, 300 Longwood Avenue Boston Massachusetts 02115
| | - Chuncui Huang
- Institute of Biophysics, Chinese Academy of Sciences, 15 Da Tun Road, Chaoyang District, Beijing 100101 China
| | - Yan Li
- Institute of Biophysics, Chinese Academy of Sciences, 15 Da Tun Road, Chaoyang District, Beijing 100101 China
| | - Yaming Liu
- Institute of Biophysics, Chinese Academy of Sciences, 15 Da Tun Road, Chaoyang District, Beijing 100101 China
| | - Shiwei Sun
- Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 15 Da Tun Road, Chaoyang District, Beijing 100101 China
| | - Yaojun Wang
- Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 15 Da Tun Road, Chaoyang District, Beijing 100101 China
| | - Youngsuk Seo
- Graduate School of Analytical Science and Technology, Chungnam National University, Gung-dong 220, Yuseong-Gu, Daejeon 305-764, Korea (South)
| | - Hyun Joo An
- Graduate School of Analytical Science and Technology, Chungnam National University, Gung-dong 220, Yuseong-Gu, Daejeon 305-764, Korea (South)
| | | | | | - Stephanie Archer-Hartmann
- Analytical Services, Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road Athens, Georgia 30602
| | - Parastoo Azadi
- Analytical Services, Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road Athens, Georgia 30602
| | - Len Bell
- BioCMC Solutions (Large Molecules), Covance Laboratories Limited, Otley Road, Harrogate, North Yorks HG3 1PY, United Kingdom
| | - Zsuzsanna Lakos
- Biochemistry Method Development & Validation, Eurofins Lancaster Laboratories, Inc., 2425 New Holland Pike Lancaster, Pennsylvania 17601
| | - Yanming An
- Center for Biologics Evaluation and Research, Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, Maryland 20993
| | - John F Cipollo
- Center for Biologics Evaluation and Research, Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, Maryland 20993
| | - Maja Pucic-Bakovic
- Glycoscience Research Laboratory, Genos, Borongajska cesta 83h, 10 000 Zagreb, Croatia
| | - Jerko Štambuk
- Glycoscience Research Laboratory, Genos, Borongajska cesta 83h, 10 000 Zagreb, Croatia
| | - Gordan Lauc
- Glycoscience Research Laboratory, Genos, Borongajska cesta 83h, 10 000 Zagreb, Croatia; Faculty of Pharmacy and Biochemistry, University of Zagreb, A. Kovačića 1, 10 000 Zagreb, Croatia
| | - Xu Li
- Department of Chemistry, Georgia State University, 100 Piedmont Avenue, Atlanta, Georgia 30303
| | - Peng George Wang
- Department of Chemistry, Georgia State University, 100 Piedmont Avenue, Atlanta, Georgia 30303
| | - Andreas Bock
- glyXera GmbH, Brenneckestrasse 20 * ZENIT / 39120 Magdeburg, Germany
| | - René Hennig
- glyXera GmbH, Brenneckestrasse 20 * ZENIT / 39120 Magdeburg, Germany
| | - Erdmann Rapp
- glyXera GmbH, Brenneckestrasse 20 * ZENIT / 39120 Magdeburg, Germany; AstraZeneca, Granta Park, Cambridgeshire, CB21 6GH United Kingdom
| | - Marybeth Creskey
- Health Products and Foods Branch, Health Canada, AL 2201E, 251 Sir Frederick Banting Driveway, Ottawa, Ontario, K1A 0K9 Canada
| | - Terry D Cyr
- Health Products and Foods Branch, Health Canada, AL 2201E, 251 Sir Frederick Banting Driveway, Ottawa, Ontario, K1A 0K9 Canada
| | - Miyako Nakano
- Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama Higashi-Hiroshima 739-8530 Japan
| | - Taiki Sugiyama
- Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama Higashi-Hiroshima 739-8530 Japan
| | | | - Paweł Link-Lenczowski
- Department of Medical Physiology, Jagiellonian University Medical College, ul. Michalowskiego 12, 31-126 Krakow, Poland
| | - Jolanta Jaworek
- Department of Medical Physiology, Jagiellonian University Medical College, ul. Michalowskiego 12, 31-126 Krakow, Poland
| | - Shuang Yang
- Department of Pathology, Johns Hopkins University, 400 N. Broadway Street Baltimore, Maryland 21287
| | - Hui Zhang
- Department of Pathology, Johns Hopkins University, 400 N. Broadway Street Baltimore, Maryland 21287
| | - Tim Kelly
- Mass Spec Core Facility, KBI Biopharma, 1101 Hamlin Road Durham, North Carolina 27704
| | - Song Klapoetke
- Mass Spec Core Facility, KBI Biopharma, 1101 Hamlin Road Durham, North Carolina 27704
| | - Rui Cao
- Mass Spec Core Facility, KBI Biopharma, 1101 Hamlin Road Durham, North Carolina 27704
| | - Jin Young Kim
- Division of Mass Spectrometry, Korea Basic Science Institute, 162 YeonGuDanji-Ro, Ochang-eup, Cheongwon-gu, Cheongju Chungbuk, 363-883 Korea (South)
| | - Hyun Kyoung Lee
- Division of Mass Spectrometry, Korea Basic Science Institute, 162 YeonGuDanji-Ro, Ochang-eup, Cheongwon-gu, Cheongju Chungbuk, 363-883 Korea (South)
| | - Ju Yeon Lee
- Division of Mass Spectrometry, Korea Basic Science Institute, 162 YeonGuDanji-Ro, Ochang-eup, Cheongwon-gu, Cheongju Chungbuk, 363-883 Korea (South)
| | - Jong Shin Yoo
- Division of Mass Spectrometry, Korea Basic Science Institute, 162 YeonGuDanji-Ro, Ochang-eup, Cheongwon-gu, Cheongju Chungbuk, 363-883 Korea (South)
| | - Sa-Rang Kim
- Advanced Therapy Products Research Division, Korea National Institute of Food and Drug Safety, 187 Osongsaengmyeong 2-ro Osong-eup, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do, 363-700, Korea (South)
| | - Soo-Kyung Suh
- Advanced Therapy Products Research Division, Korea National Institute of Food and Drug Safety, 187 Osongsaengmyeong 2-ro Osong-eup, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do, 363-700, Korea (South)
| | - Noortje de Haan
- Center for Proteomics and Metabolomics, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - David Falck
- Center for Proteomics and Metabolomics, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | | | - Manfred Wuhrer
- Center for Proteomics and Metabolomics, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Robert J Emery
- Ludger Limited, Culham Science Centre, Abingdon, Oxfordshire, OX14 3EB, United Kingdom
| | - Radoslaw P Kozak
- Ludger Limited, Culham Science Centre, Abingdon, Oxfordshire, OX14 3EB, United Kingdom
| | - Li Phing Liew
- Ludger Limited, Culham Science Centre, Abingdon, Oxfordshire, OX14 3EB, United Kingdom
| | - Louise Royle
- Ludger Limited, Culham Science Centre, Abingdon, Oxfordshire, OX14 3EB, United Kingdom
| | - Paulina A Urbanowicz
- Ludger Limited, Culham Science Centre, Abingdon, Oxfordshire, OX14 3EB, United Kingdom
| | - Nicolle H Packer
- Biomolecular Discovery and Design Research Centre and ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP), Macquarie University, North Ryde, Australia
| | - Xiaomin Song
- Biomolecular Discovery and Design Research Centre and ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP), Macquarie University, North Ryde, Australia
| | - Arun Everest-Dass
- Biomolecular Discovery and Design Research Centre and ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP), Macquarie University, North Ryde, Australia
| | - Erika Lattová
- Proteomics, Central European Institute for Technology, Masaryk University, Kamenice 5, A26, 625 00 BRNO, Czech Republic
| | - Samanta Cajic
- Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstrasse 1, 39106 Magdeburg, Germany
| | - Kathirvel Alagesan
- Department of Biomolecular Sciences, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - Daniel Kolarich
- Department of Biomolecular Sciences, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - Toyin Kasali
- AstraZeneca, Granta Park, Cambridgeshire, CB21 6GH United Kingdom
| | - Viv Lindo
- AstraZeneca, Granta Park, Cambridgeshire, CB21 6GH United Kingdom
| | - Yuetian Chen
- Merck, 2015 Galloping Hill Rd, Kenilworth, New Jersey 07033
| | - Kudrat Goswami
- Merck, 2015 Galloping Hill Rd, Kenilworth, New Jersey 07033
| | - Brian Gau
- Analytical R&D, MilliporeSigma, 2909 Laclede Ave. St. Louis, Missouri 63103
| | - Ravi Amunugama
- MS Bioworks, LLC, 3950 Varsity Drive Ann Arbor, Michigan 48108
| | - Richard Jones
- MS Bioworks, LLC, 3950 Varsity Drive Ann Arbor, Michigan 48108
| | | | - Koichi Kato
- Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki 444-8787 Japan; Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuhoku, Nagoya 467-8603 Japan
| | - Hirokazu Yagi
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuhoku, Nagoya 467-8603 Japan
| | - Sachiko Kondo
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuhoku, Nagoya 467-8603 Japan; Medical & Biological Laboratories Co., Ltd, 2-22-8 Chikusa, Chikusa-ku, Nagoya 464-0858 Japan
| | - C T Yuen
- National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Potters Bar, Hertfordshire EN6 3QG United Kingdom
| | - Akira Harazono
- Division of Biological Chemistry & Biologicals, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501 Japan
| | - Xiaofeng Shi
- New England Biolabs, Inc., 240 County Road, Ipswich, Massachusetts 01938
| | - Paula E Magnelli
- New England Biolabs, Inc., 240 County Road, Ipswich, Massachusetts 01938
| | - Brian T Kasper
- New York University, 100 Washington Square East New York City, New York 10003
| | - Lara Mahal
- New York University, 100 Washington Square East New York City, New York 10003
| | - David J Harvey
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7FZ, United Kingdom
| | - Roisin O'Flaherty
- GlycoScience Group, The National Institute for Bioprocessing Research and Training, Fosters Avenue, Mount Merrion, Blackrock, Co. Dublin, Ireland
| | - Pauline M Rudd
- GlycoScience Group, The National Institute for Bioprocessing Research and Training, Fosters Avenue, Mount Merrion, Blackrock, Co. Dublin, Ireland
| | - Radka Saldova
- GlycoScience Group, The National Institute for Bioprocessing Research and Training, Fosters Avenue, Mount Merrion, Blackrock, Co. Dublin, Ireland
| | - Elizabeth S Hecht
- Department of Chemistry, North Carolina State University, 2620 Yarborough Drive Raleigh, North Carolina 27695
| | - David C Muddiman
- Department of Chemistry, North Carolina State University, 2620 Yarborough Drive Raleigh, North Carolina 27695
| | - Jichao Kang
- Pantheon, 201 College Road East Princeton, New Jersey 08540
| | | | | | - Andrew Saati
- Pfizer Inc., 1 Burtt Road Andover, Massachusetts 01810
| | - Christine Merle
- Proteodynamics, ZI La Varenne 20-22 rue Henri et Gilberte Goudier 63200 RIOM, France
| | - Steven Mast
- ProZyme, Inc., 3832 Bay Center Place Hayward, California 94545
| | - Sam Tep
- ProZyme, Inc., 3832 Bay Center Place Hayward, California 94545
| | - Jennie Truong
- ProZyme, Inc., 3832 Bay Center Place Hayward, California 94545
| | - Takashi Nishikaze
- Koichi Tanaka Mass Spectrometry Research Laboratory, Shimadzu Corporation, 1 Nishinokyo Kuwabara-cho Nakagyo-ku, Kyoto, 604 8511 Japan
| | - Sadanori Sekiya
- Koichi Tanaka Mass Spectrometry Research Laboratory, Shimadzu Corporation, 1 Nishinokyo Kuwabara-cho Nakagyo-ku, Kyoto, 604 8511 Japan
| | - Aaron Shafer
- Children's GMP LLC, St. Jude Children's Research Hospital, 262 Danny Thomas Place Memphis, Tennessee 38105
| | - Sohei Funaoka
- Sumitomo Bakelite Co., Ltd., 1-5 Muromati 1-Chome, Nishiku, Kobe, 651-2241 Japan
| | - Masaaki Toyoda
- Sumitomo Bakelite Co., Ltd., 1-5 Muromati 1-Chome, Nishiku, Kobe, 651-2241 Japan
| | - Peter de Vreugd
- Synthon Biopharmaceuticals, Microweg 22 P.O. Box 7071, 6503 GN Nijmegen, The Netherlands
| | - Cassie Caron
- Takeda Pharmaceuticals International Co., 40 Landsdowne Street Cambridge, Massachusetts 02139
| | - Pralima Pradhan
- Takeda Pharmaceuticals International Co., 40 Landsdowne Street Cambridge, Massachusetts 02139
| | - Niclas Chiang Tan
- Takeda Pharmaceuticals International Co., 40 Landsdowne Street Cambridge, Massachusetts 02139
| | - Yehia Mechref
- Department of Chemistry and Biochemistry, Texas Tech University, 2500 Broadway, Lubbock, Texas 79409
| | - Sachin Patil
- Thermo Fisher Scientific, 1214 Oakmead Parkway Sunnyvale, California 94085
| | - Jeffrey S Rohrer
- Thermo Fisher Scientific, 1214 Oakmead Parkway Sunnyvale, California 94085
| | - Ranjan Chakrabarti
- United States Pharmacopeia India Pvt. Ltd. IKP Knowledge Park, Genome Valley, Shamirpet, Turkapally Village, Medchal District, Hyderabad 500 101 Telangana, India
| | - Disha Dadke
- United States Pharmacopeia India Pvt. Ltd. IKP Knowledge Park, Genome Valley, Shamirpet, Turkapally Village, Medchal District, Hyderabad 500 101 Telangana, India
| | - Mohammedazam Lahori
- United States Pharmacopeia India Pvt. Ltd. IKP Knowledge Park, Genome Valley, Shamirpet, Turkapally Village, Medchal District, Hyderabad 500 101 Telangana, India
| | - Chunxia Zou
- Alberta Glycomics Centre, University of Alberta, Edmonton, Alberta T6G 2G2 Canada; Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2 Canada
| | - Christopher Cairo
- Alberta Glycomics Centre, University of Alberta, Edmonton, Alberta T6G 2G2 Canada; Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2 Canada
| | - Béla Reiz
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2 Canada
| | - Randy M Whittal
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2 Canada
| | - Carlito B Lebrilla
- Department of Chemistry, University of California, One Shields Ave, Davis, California 95616
| | - Lauren Wu
- Department of Chemistry, University of California, One Shields Ave, Davis, California 95616
| | - Andras Guttman
- Horváth Csaba Memorial Laboratory for Bioseparation Sciences, Research Center for Molecular Medicine, Doctoral School of Molecular Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Egyetem ter 1, Hungary
| | - Marton Szigeti
- Horváth Csaba Memorial Laboratory for Bioseparation Sciences, Research Center for Molecular Medicine, Doctoral School of Molecular Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Egyetem ter 1, Hungary; Translational Glycomics Research Group, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Veszprem, Egyetem ut 10, Hungary
| | - Benjamin G Kremkow
- Delaware Biotechnology Institute, University of Delaware, 15 Innovation Way Newark, Delaware 19711
| | - Kelvin H Lee
- Delaware Biotechnology Institute, University of Delaware, 15 Innovation Way Newark, Delaware 19711
| | - Carina Sihlbom
- Proteomics Core Facility, University of Gothenburg, Medicinaregatan 1G SE 41390 Gothenburg, Sweden
| | - Barbara Adamczyk
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Institute of Biomedicine, Sahlgrenska Academy, Medicinaregatan 9A, Box 440, 405 30, Gothenburg, Sweden
| | - Chunsheng Jin
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Institute of Biomedicine, Sahlgrenska Academy, Medicinaregatan 9A, Box 440, 405 30, Gothenburg, Sweden
| | - Niclas G Karlsson
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Institute of Biomedicine, Sahlgrenska Academy, Medicinaregatan 9A, Box 440, 405 30, Gothenburg, Sweden
| | - Jessica Örnros
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Institute of Biomedicine, Sahlgrenska Academy, Medicinaregatan 9A, Box 440, 405 30, Gothenburg, Sweden
| | - Göran Larson
- Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy at the University of Gothenburg, Bruna Straket 16, 41345 Gothenburg, Sweden
| | - Jonas Nilsson
- Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy at the University of Gothenburg, Bruna Straket 16, 41345 Gothenburg, Sweden
| | - Bernd Meyer
- Department of Chemistry, University of Hamburg, Martin Luther King Pl. 6 20146 Hamburg, Germany
| | - Alena Wiegandt
- Department of Chemistry, University of Hamburg, Martin Luther King Pl. 6 20146 Hamburg, Germany
| | - Emy Komatsu
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, Canada R3T 2N2
| | - Helene Perreault
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, Canada R3T 2N2
| | - Edward D Bodnar
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, Canada R3T 2N2; Agilent Technologies, Inc., 5301 Stevens Creek Blvd Santa Clara, California 95051
| | - Nassur Said
- Laboratory of Mass Spectrometry of Interactions and Systems, University of Strasbourg, UMR Unistra-CNRS 7140, France
| | - Yannis-Nicolas Francois
- Laboratory of Mass Spectrometry of Interactions and Systems, University of Strasbourg, UMR Unistra-CNRS 7140, France
| | - Emmanuelle Leize-Wagner
- Laboratory of Mass Spectrometry of Interactions and Systems, University of Strasbourg, UMR Unistra-CNRS 7140, France
| | - Sandra Maier
- Natural and Medical Sciences Institute, University of Tübingen, Markwiesenstraβe 55, 72770 Reutlingen, Germany
| | - Anne Zeck
- Natural and Medical Sciences Institute, University of Tübingen, Markwiesenstraβe 55, 72770 Reutlingen, Germany
| | - Albert J R Heck
- Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Yang Yang
- Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Rob Haselberg
- Division of Bioanalytical Chemistry, Amsterdam Institute for Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, de Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
| | - Ying Qing Yu
- Department of Chemistry, Waters Corporation, 34 Maple Street Milford, Massachusetts 01757
| | - William Alley
- Department of Chemistry, Waters Corporation, 34 Maple Street Milford, Massachusetts 01757
| | | | - Hua Yuan
- Zoetis, 333 Portage St. Kalamazoo, Michigan 49007
| | - Stephen E Stein
- Mass Spectrometry Data Center, Biomolecular Measurement Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive Gaithersburg, Maryland 20899
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24
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Bekeova C, Anderson-Pullinger L, Boye K, Boos F, Sharpadskaya Y, Herrmann JM, Seifert EL. Multiple mitochondrial thioesterases have distinct tissue and substrate specificity and CoA regulation, suggesting unique functional roles. J Biol Chem 2019; 294:19034-19047. [PMID: 31676684 PMCID: PMC6916504 DOI: 10.1074/jbc.ra119.010901] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/16/2019] [Indexed: 12/13/2022] Open
Abstract
Acyl-CoA thioesterases (Acots) hydrolyze fatty acyl-CoA esters. Acots in the mitochondrial matrix are poised to mitigate β-oxidation overload and maintain CoA availability. Several Acots associate with mitochondria, but whether they all localize to the matrix, are redundant, or have different roles is unresolved. Here, we compared the suborganellar localization, activity, expression, and regulation among mitochondrial Acots (Acot2, -7, -9, and -13) in mitochondria from multiple mouse tissues and from a model of Acot2 depletion. Acot7, -9, and -13 localized to the matrix, joining Acot2 that was previously shown to localize there. Mitochondria from heart, skeletal muscle, brown adipose tissue, and kidney robustly expressed Acot2, -9, and -13; Acot9 levels were substantially higher in brown adipose tissue and kidney mitochondria, as was activity for C4:0-CoA, a unique Acot9 substrate. In all tissues, Acot2 accounted for about half of the thioesterase activity for C14:0-CoA and C16:0-CoA. In contrast, liver mitochondria from fed and fasted mice expressed little Acot activity, which was confined to long-chain CoAs and due mainly to Acot7 and Acot13 activities. Matrix Acots occupied different functional niches, based on substrate specificity (Acot9 versus Acot2 and -13) and strong CoA inhibition (Acot7, -9, and -13, but not Acot2). Interpreted in the context of β-oxidation, CoA inhibition would prevent Acot-mediated suppression of β-oxidation, while providing a release valve when CoA is limiting. In contrast, CoA-insensitive Acot2 could provide a constitutive siphon for long-chain fatty acyl-CoAs. These results reveal how the family of matrix Acots can mitigate β-oxidation overload and prevent CoA limitation.
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Affiliation(s)
- Carmen Bekeova
- MitoCare Center, Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Lauren Anderson-Pullinger
- MitoCare Center, Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Kevin Boye
- MitoCare Center, Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Felix Boos
- Division of Cellular Biology, Department of Biology, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Yana Sharpadskaya
- MitoCare Center, Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Johannes M Herrmann
- Division of Cellular Biology, Department of Biology, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Erin L Seifert
- MitoCare Center, Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
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25
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O'Hara SP, Splinter PL, Trussoni CE, Guicciardi ME, Splinter NP, Al Suraih MS, Nasser-Ghodsi N, Stollenwerk D, Gores GJ, LaRusso NF. The transcription factor ETS1 promotes apoptosis resistance of senescent cholangiocytes by epigenetically up-regulating the apoptosis suppressor BCL2L1. J Biol Chem 2019; 294:18698-18713. [PMID: 31659122 PMCID: PMC6901313 DOI: 10.1074/jbc.ra119.010176] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 10/15/2019] [Indexed: 12/21/2022] Open
Abstract
Primary sclerosing cholangitis (PSC) is an idiopathic, progressive cholangiopathy. Cholangiocyte senescence is important in PSC pathogenesis, and we have previously reported that senescence is regulated by the transcription factor ETS proto-oncogene 1 (ETS1) and associated with overexpression of BCL2 like 1 (BCL2L1 or BCL-xL), an anti-apoptotic BCL2-family member. Here, we further explored the mechanisms regulating BCL-xL-mediated, apoptosis resistance in senescent cholangiocytes and uncovered that ETS1 and the histone acetyltransferase E1A-binding protein P300 (EP300 or p300) both promote BCL-xL transcription. Using immunofluorescence, we found that BCL-xL protein expression is increased both in cholangiocytes of livers from individuals with PSC and a mouse model of PSC. Using an in vitro model of lipopolysaccharide-induced senescence in normal human cholangiocytes (NHCs), we found increased BCL-xL mRNA and protein levels, and ChIP-PCRs indicated increased occupancy of ETS1, p300, and histone 3 Lys-27 acetylation (H3K27Ac) at the BCL-xL promoter. Using co-immunoprecipitation and proximity ligation assays, we further demonstrate that ETS1 and p300 physically interact in senescent but not control NHCs. Additionally, mutagenesis of predicted ETS1-binding sites within the BCL-xL promoter blocked luciferase reporter activity, and CRISPR/Cas9-mediated genetic deletion of ETS1 reduced senescence-associated BCL-xL expression. In senescent NHCs, TRAIL-mediated apoptosis was reduced ∼70%, and ETS1 deletion or RNAi-mediated BCL-xL suppression increased apoptosis. Overall, our results suggest that ETS1 and p300 promote senescent cholangiocyte resistance to apoptosis by modifying chromatin and inducing BCL-xL expression. These findings reveal ETS1 as a central regulator of both cholangiocyte senescence and the associated apoptosis-resistant phenotype.
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Affiliation(s)
- Steven P O'Hara
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905.
| | - Patrick L Splinter
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Christy E Trussoni
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Maria Eugenia Guicciardi
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Noah P Splinter
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Mohammed S Al Suraih
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Navine Nasser-Ghodsi
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Deborah Stollenwerk
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Gregory J Gores
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
| | - Nicholas F LaRusso
- Division of Gastroenterology and Hepatology and the Mayo Clinic Center for Cell Signaling in Gastroenterology, Mayo Clinic, Rochester, Minnesota 55905
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26
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Goonatilleke E, Smilowitz JT, Mariño KV, German BJ, Lebrilla CB, Barboza M. Immunoglobulin A N-glycosylation Presents Important Body Fluid-specific Variations in Lactating Mothers. Mol Cell Proteomics 2019; 18:2165-2177. [PMID: 31409668 PMCID: PMC6823845 DOI: 10.1074/mcp.ra119.001648] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Indexed: 01/09/2023] Open
Abstract
Secretory Immunoglobulin A (SIgA) is central to mucosal immunity: represents one of the main immunological mechanisms of defense against the potential attack of pathogens. During lactation SIgA is produced by plasmablasts in the mammary gland and is present in breast milk, playing a vital role in the passive immunity of the newborn. Interestingly, the different components of SIgA are highly N-glycosylated, and these N-Glycans have an essential role in health maintenance. In this work, we performed a glycomic study to compare N-glycosylation of SIgA purified from mature breast milk and saliva, and plasma IgA from the same lactating participants. Our results revealed a greater diversity than previously reported, with 89 glycan compositions that may correspond to over 250 structures. Among these glycans, 54 glycan compositions were characterized as body-fluid specific. Most of these unique N-Glycan compositions identified in SIgA from mature milk and IgA from plasma were fucosylated and both fucosylated and sialylated species, whereas in salivary SIgA the unique structures were mainly undecorated complex N-Glycans. In addition, we evaluated the effect of delivery mode on (S)IgA glycosylation. Lactating participants who had given birth by vaginal delivery presented an increased proportion of high mannose and fucosylated glycans in salivary SIgA, and selected high mannose, fucosylated, sialylated, and both fucosylated and sialylated glycans in plasma IgA, indicating that the hormonal changes during vaginal delivery could affect plasma and saliva IgA. These results reveal the structural details that provide a new dimension to the roles of (S)IgA N-Glycans in different tissues, and especially in maternal and new-born protection and infant development. The design of optimal recombinant IgA molecules specifically targeted to protect mucosal surfaces will need to include this dimension of structural detail.
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Affiliation(s)
- Elisha Goonatilleke
- Department of Chemistry, University of California Davis, Davis, California 95616
| | - Jennifer T Smilowitz
- Foods for Health Institute, University of California Davis, Davis, California 95616; Department of Food Science and Technology, University of California Davis, Davis, California 95616
| | - Karina V Mariño
- Laboratorio de Glicómica Funcional y Molecular, Instituto de Biología y Medicina Experimental- Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), C1428ADN, Buenos Aires, Argentina
| | - Bruce J German
- Foods for Health Institute, University of California Davis, Davis, California 95616; Department of Food Science and Technology, University of California Davis, Davis, California 95616
| | - Carlito B Lebrilla
- Department of Chemistry, University of California Davis, Davis, California 95616; Foods for Health Institute, University of California Davis, Davis, California 95616; Department of Biochemistry and Molecular Medicine, University of California Davis, Davis, California 95616
| | - Mariana Barboza
- Department of Chemistry, University of California Davis, Davis, California 95616; Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California Davis, Davis, California 95616.
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27
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Gao S, Ghoshal S, Zhang L, Stevens JR, McCommis KS, Finck BN, Lopaschuk GD, Butler AA. The peptide hormone adropin regulates signal transduction pathways controlling hepatic glucose metabolism in a mouse model of diet-induced obesity. J Biol Chem 2019; 294:13366-13377. [PMID: 31324719 PMCID: PMC6737218 DOI: 10.1074/jbc.ra119.008967] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/02/2019] [Indexed: 12/24/2022] Open
Abstract
The peptide hormone adropin regulates energy metabolism in skeletal muscle and plays important roles in the regulation of metabolic homeostasis. Besides muscle, the liver has an essential role in regulating glucose homeostasis. Previous studies have reported that treatment of diet-induced obese (DIO) male mice with adropin34-76 (the putative secreted domain) reduces fasting blood glucose independently of body weight changes, suggesting that adropin suppresses glucose production in the liver. Here, we explored the molecular mechanisms underlying adropin's effects on hepatic glucose metabolism in DIO mice. Male DIO B6 mice maintained on a high-fat diet received five intraperitoneal injections of adropin34-76 (450 nmol/kg/injection) over a 48-h period. We found that adropin34-76 enhances major intracellular signaling activities in the liver that are involved in insulin-mediated regulation of glucose homeostasis. Moreover, treatment with adropin34-76 alleviated endoplasmic reticulum stress responses and reduced activity of c-Jun N-terminal kinase in the liver, explaining the enhanced activities of hepatic insulin signaling pathways observed with adropin34-76 treatment. Furthermore, adropin34-76 suppressed cAMP activated protein kinase A (PKA) activities, resulting in reduced phosphorylation of inositol trisphosphate receptor, which mediates endoplasmic reticulum calcium efflux, and of cAMP-responsive element-binding protein, a key transcription factor in hepatic regulation of glucose metabolism. Adropin34-76 directly affected liver metabolism, decreasing glucose production and reducing PKA-mediated phosphorylation in primary mouse hepatocytes in vitro Our findings indicate that major hepatic signaling pathways contribute to the improved glycemic control achieved with adropin34-76 treatment in situations of obesity.
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Affiliation(s)
- Su Gao
- Department of Pediatrics, University of Alberta, Edmonton, Alberta T6G 2R7, Canada; Department of Metabolism and Aging, Scripps Research Institute, Jupiter, Florida 33458
| | - Sarbani Ghoshal
- Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63104
| | - Liyan Zhang
- Department of Pediatrics, University of Alberta, Edmonton, Alberta T6G 2R7, Canada
| | - Joseph R Stevens
- Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63104
| | - Kyle S McCommis
- Division of Geriatrics and Nutritional Sciences, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110
| | - Brian N Finck
- Division of Geriatrics and Nutritional Sciences, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110
| | - Gary D Lopaschuk
- Department of Pediatrics, University of Alberta, Edmonton, Alberta T6G 2R7, Canada
| | - Andrew A Butler
- Department of Metabolism and Aging, Scripps Research Institute, Jupiter, Florida 33458; Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63104.
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28
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Ghosh S, Wicks SE, Vandanmagsar B, Mendoza TM, Bayless DS, Salbaum JM, Dearth SP, Campagna SR, Mynatt RL, Noland RC. Extensive metabolic remodeling after limiting mitochondrial lipid burden is consistent with an improved metabolic health profile. J Biol Chem 2019; 294:12313-12327. [PMID: 31097541 PMCID: PMC6699851 DOI: 10.1074/jbc.ra118.006074] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 04/29/2019] [Indexed: 01/19/2023] Open
Abstract
Mitochondrial lipid overload in skeletal muscle contributes to insulin resistance, and strategies limiting this lipid pressure improve glucose homeostasis; however, comprehensive cellular adaptations that occur in response to such an intervention have not been reported. Herein, mice with skeletal muscle-specific deletion of carnitine palmitoyltransferase 1b (Cpt1bM-/-), which limits mitochondrial lipid entry, were fed a moderate fat (25%) diet, and samples were subjected to a multimodal analysis merging transcriptomics, proteomics, and nontargeted metabolomics to characterize the coordinated multilevel cellular responses that occur when mitochondrial lipid burden is mitigated. Limiting mitochondrial fat entry predictably improves glucose homeostasis; however, remodeling of glucose metabolism pathways pales compared with adaptations in amino acid and lipid metabolism pathways, shifts in nucleotide metabolites, and biogenesis of mitochondria and peroxisomes. Despite impaired fat utilization, Cpt1bM-/- mice have increased acetyl-CoA (14-fold) and NADH (2-fold), indicating metabolic shifts yield sufficient precursors to meet energy demand; however, this does not translate to enhance energy status as Cpt1bM-/- mice have low ATP and high AMP levels, signifying energy deficit. Comparative analysis of transcriptomic data with disease-associated gene-sets not only predicted reduced risk of glucose metabolism disorders but was also consistent with lower risk for hepatic steatosis, cardiac hypertrophy, and premature death. Collectively, these results suggest induction of metabolic inefficiency under conditions of energy surfeit likely contributes to improvements in metabolic health when mitochondrial lipid burden is mitigated. Moreover, the breadth of disease states to which mechanisms induced by muscle-specific Cpt1b inhibition may mediate health benefits could be more extensive than previously predicted.
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Affiliation(s)
- Sujoy Ghosh
- Laboratory of Computational Biology, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808; Program in Cardiovascular and Metabolic Disorders and Center for Computational Biology, Duke-National University of Singapore Medical School, Singapore 169857, Singapore
| | - Shawna E Wicks
- Talaria Antibodies, Inc., Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808; Gene Nutrient Interactions Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Bolormaa Vandanmagsar
- Gene Nutrient Interactions Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Tamra M Mendoza
- Gene Nutrient Interactions Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - David S Bayless
- Gene Nutrient Interactions Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - J Michael Salbaum
- Genomics Core Facility, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Stephen P Dearth
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - Shawn R Campagna
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - Randall L Mynatt
- Gene Nutrient Interactions Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808; Transgenic Core Facility, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Robert C Noland
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808.
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29
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Bhattacharya S, Stanley CB, Heller WT, Friedman PA, Bu Z. Dynamic structure of the full-length scaffolding protein NHERF1 influences signaling complex assembly. J Biol Chem 2019; 294:11297-11310. [PMID: 31171716 PMCID: PMC6643037 DOI: 10.1074/jbc.ra119.008218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 06/05/2019] [Indexed: 01/14/2023] Open
Abstract
The Na+/H+ exchange regulatory cofactor 1 (NHERF1) protein modulates the assembly and intracellular trafficking of several transmembrane G protein-coupled receptors (GPCRs) and ion transport proteins with the membrane-cytoskeleton adapter protein ezrin. Here, we applied solution NMR and small-angle neutron scattering (SANS) to structurally characterize full-length NHERF1 and disease-associated variants that are implicated in impaired phosphate homeostasis. Using NMR, we mapped the modular architecture of NHERF1, which is composed of two structurally-independent PDZ domains that are connected by a flexible, disordered linker. We observed that the ultra-long and disordered C-terminal tail of NHERF1 has a type 1 PDZ-binding motif that interacts weakly with the proximal, second PDZ domain to form a dynamically autoinhibited structure. Using ensemble-optimized analysis of SANS data, we extracted the molecular size distribution of structures from the extensive conformational space sampled by the flexible chain. Our results revealed that NHERF1 is a diffuse ensemble of variable PDZ domain configurations and a disordered C-terminal tail. The joint NMR/SANS data analyses of three disease variants (L110V, R153Q, and E225K) revealed significant differences in the local PDZ domain structures and in the global conformations compared with the WT protein. Furthermore, we show that the substitutions affect the affinity and kinetics of NHERF1 binding to ezrin and to a C-terminal peptide from G protein-coupled receptor kinase 6A (GRK6A). These findings provide important insight into the modulation of the intrinsic flexibility of NHERF1 by disease-associated point mutations that alter the dynamic assembly of signaling complexes.
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Affiliation(s)
| | - Christopher B Stanley
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
| | - William T Heller
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
| | - Peter A Friedman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Zimei Bu
- Department of Chemistry and Biochemistry, City College of New York, New York, New York 10031
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30
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Wang XP, Im SJ, Balchak DM, Montalbetti N, Carattino MD, Ray EC, Kashlan OB. Murine epithelial sodium (Na +) channel regulation by biliary factors. J Biol Chem 2019; 294:10182-10193. [PMID: 31092599 PMCID: PMC6664190 DOI: 10.1074/jbc.ra119.007394] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 05/15/2019] [Indexed: 01/01/2023] Open
Abstract
The epithelial sodium channel (ENaC) mediates Na+ transport in several epithelia, including the aldosterone-sensitive distal nephron, distal colon, and biliary epithelium. Numerous factors regulate ENaC activity, including extracellular ligands, post-translational modifications, and membrane-resident lipids. However, ENaC regulation by bile acids and conjugated bilirubin, metabolites that are abundant in the biliary tree and intestinal tract and are sometimes elevated in the urine of individuals with advanced liver disease, remains poorly understood. Here, using a Xenopus oocyte-based system to express and functionally study ENaC, we found that, depending on the bile acid used, bile acids both activate and inhibit mouse ENaC. Whether bile acids were activating or inhibiting was contingent on the position and orientation of specific bile acid moieties. For example, a hydroxyl group at the 12-position and facing the hydrophilic side (12α-OH) was activating. Taurine-conjugated bile acids, which have reduced membrane permeability, affected ENaC activity more strongly than did their more membrane-permeant unconjugated counterparts, suggesting that bile acids regulate ENaC extracellularly. Bile acid-dependent activation was enhanced by amino acid substitutions in ENaC that depress open probability and was precluded by proteolytic cleavage that increases open probability, consistent with an effect of bile acids on ENaC open probability. Bile acids also regulated ENaC in a cortical collecting duct cell line, mirroring the results in Xenopus oocytes. We also show that bilirubin conjugates activate ENaC. These results indicate that ENaC responds to compounds abundant in bile and that their ability to regulate this channel depends on the presence of specific functional groups.
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Affiliation(s)
- Xue-Ping Wang
- From the Renal-Electrolyte Division, Department of Medicine
| | | | | | | | - Marcelo D Carattino
- From the Renal-Electrolyte Division, Department of Medicine
- the Department of Cell Biology and Molecular Physiology, and
| | - Evan C Ray
- From the Renal-Electrolyte Division, Department of Medicine
| | - Ossama B Kashlan
- From the Renal-Electrolyte Division, Department of Medicine,
- the Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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31
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Butler AA, Zhang J, Price CA, Stevens JR, Graham JL, Stanhope KL, King S, Krauss RM, Bremer AA, Havel PJ. Low plasma adropin concentrations increase risks of weight gain and metabolic dysregulation in response to a high-sugar diet in male nonhuman primates. J Biol Chem 2019; 294:9706-9719. [PMID: 30988006 PMCID: PMC6597842 DOI: 10.1074/jbc.ra119.007528] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/30/2019] [Indexed: 12/15/2022] Open
Abstract
Mouse studies linking adropin, a peptide hormone encoded by the energy homeostasis-associated (ENHO) gene, to biological clocks and to glucose and lipid metabolism suggest a potential therapeutic target for managing diseases of metabolism. However, adropin's roles in human metabolism are unclear. In silico expression profiling in a nonhuman primate diurnal transcriptome atlas (GSE98965) revealed a dynamic and diurnal pattern of ENHO expression. ENHO expression is abundant in brain, including ventromedial and lateral hypothalamic nuclei regulating appetite and autonomic function. Lower ENHO expression is present in liver, lung, kidney, ileum, and some endocrine glands. Hepatic ENHO expression associates with genes involved in glucose and lipid metabolism. Unsupervised hierarchical clustering identified 426 genes co-regulated with ENHO in liver, ileum, kidney medulla, and lung. Gene Ontology analysis of this cluster revealed enrichment for epigenetic silencing by histone H3K27 trimethylation and biological processes related to neural function. Dietary intervention experiments with 59 adult male rhesus macaques indicated low plasma adropin concentrations were positively correlated with fasting glucose, plasma leptin, and apolipoprotein C3 (APOC3) concentrations. During consumption of a high-sugar (fructose) diet, which induced 10% weight gain, animals with low adropin had larger increases of plasma leptin and more severe hyperglycemia. Declining adropin concentrations were correlated with increases of plasma APOC3 and triglycerides. In summary, peripheral ENHO expression associates with pathways related to epigenetic and neural functions, and carbohydrate and lipid metabolism, suggesting co-regulation in nonhuman primates. Low circulating adropin predicts increased weight gain and metabolic dysregulation during consumption of a high-sugar diet.
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Affiliation(s)
- Andrew A Butler
- From the Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63104,
- The Henry and Amelia Nasrallah Center for Neuroscience, Saint Louis University, St. Louis, Missouri 63104
| | - Jinsong Zhang
- From the Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63104
- The Henry and Amelia Nasrallah Center for Neuroscience, Saint Louis University, St. Louis, Missouri 63104
| | - Candice A Price
- the Department of Molecular Biosciences, School of Veterinary Medicine and Department of Nutrition, University of California, Davis, Davis, California 95616
| | - Joseph R Stevens
- From the Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63104
| | - James L Graham
- the Department of Molecular Biosciences, School of Veterinary Medicine and Department of Nutrition, University of California, Davis, Davis, California 95616
| | - Kimber L Stanhope
- the Department of Molecular Biosciences, School of Veterinary Medicine and Department of Nutrition, University of California, Davis, Davis, California 95616
| | - Sarah King
- the Children's Hospital Oakland Research Institute, Oakland, California 94609, and
| | - Ronald M Krauss
- the Children's Hospital Oakland Research Institute, Oakland, California 94609, and
| | - Andrew A Bremer
- the Department of Pediatrics, Vanderbilt University, Nashville, Tennessee 37232
| | - Peter J Havel
- the Department of Molecular Biosciences, School of Veterinary Medicine and Department of Nutrition, University of California, Davis, Davis, California 95616,
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32
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Youn DY, Xiaoli AM, Kwon H, Yang F, Pessin JE. The subunit assembly state of the Mediator complex is nutrient-regulated and is dysregulated in a genetic model of insulin resistance and obesity. J Biol Chem 2019; 294:9076-9083. [PMID: 31028171 PMCID: PMC6556571 DOI: 10.1074/jbc.ra119.007850] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/18/2019] [Indexed: 01/22/2023] Open
Abstract
The Mediator complex plays a critical role in the regulation of transcription by linking transcription factors to RNA polymerase II. By examining mouse livers, we have found that in the fasted state, the Mediator complex exists primarily as an approximately 1.2-MDa complex, consistent with the size of the large Mediator complex, whereas following feeding, it converts to an approximately 600-kDa complex, consistent with the size of the core Mediator complex. This dynamic change is due to the dissociation and degradation of the kinase module that includes the MED13, MED12, cyclin-dependent kinase 8 (CDK8), and cyclin C (CCNC) subunits. The dissociation and degradation of the kinase module are dependent upon nutrient activation of mTORC1 that is necessary for the induction of lipogenic gene expression because pharmacological or genetic inhibition of mTORC1 in the fed state restores the kinase module. The degradation but not dissociation of the kinase module depends upon the E3 ligase, SCFFBW7 In addition, genetically insulin-resistant and obese db/db mice in the fasted state displayed elevated lipogenic gene expression and loss of the kinase module that was reversed following mTORC1 inhibition. These data demonstrate that the assembly state of the Mediator complex undergoes physiologic regulation during normal cycles of fasting and feeding in the mouse liver. Furthermore, the assembly state of the Mediator complex is dysregulated in states of obesity and insulin resistance.
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Affiliation(s)
- Dou Yeon Youn
- From the Departments of Medicine
- Molecular Pharmacology and
| | - Alus M Xiaoli
- From the Departments of Medicine
- Developmental and Molecular Biology, and
| | - Hyokjoon Kwon
- the Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey 08901
| | - Fajun Yang
- From the Departments of Medicine
- Developmental and Molecular Biology, and
- the Fleischer Institute of Diabetes and Metabolism, Albert Einstein College of Medicine, Bronx, New York 10461 and
| | - Jeffrey E Pessin
- From the Departments of Medicine,
- Molecular Pharmacology and
- the Fleischer Institute of Diabetes and Metabolism, Albert Einstein College of Medicine, Bronx, New York 10461 and
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Scheiber IF, Wu Y, Morgan SE, Zhao N. The intestinal metal transporter ZIP14 maintains systemic manganese homeostasis. J Biol Chem 2019; 294:9147-9160. [PMID: 31028174 PMCID: PMC6556583 DOI: 10.1074/jbc.ra119.008762] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 04/24/2019] [Indexed: 12/21/2022] Open
Abstract
ZIP14 (encoded by the solute carrier 39 family member 14 (SLC39A14) gene) is a manganese transporter that is abundantly expressed in the liver and small intestine. Loss-of-function mutations in SLC39A14 cause severe hypermanganesemia. Because the liver is regarded as the main regulatory organ involved in manganese homeostasis, impaired hepatic manganese uptake for subsequent biliary excretion has been proposed as the underlying disease mechanism. However, liver-specific Zip14 KO mice exhibit decreased manganese only in the liver and do not develop manganese accumulation in other tissues under normal conditions. This suggests that impaired hepatobiliary excretion is not the primary cause for manganese overload observed in individuals lacking functional ZIP14. We therefore hypothesized that increased intestinal manganese absorption could induce manganese hyperaccumulation when ZIP14 is inactivated. To elucidate the role of ZIP14 in manganese absorption, here we used CaCo-2 Transwell cultures as a model system for intestinal epithelia. The generation of a ZIP14-deficient CaCo-2 cell line enabled the identification of ZIP14 as the major transporter mediating basolateral manganese uptake in enterocytes. Lack of ZIP14 severely impaired basolateral-to-apical (secretory) manganese transport and strongly enhanced manganese transport in the apical-to-basolateral (absorptive) direction. Mechanistic studies provided evidence that ZIP14 restricts manganese transport in the absorptive direction via direct basolateral reuptake of freshly absorbed manganese. In support of such function of intestinal ZIP14 in vivo, manganese levels in the livers and brains of intestine-specific Zip14 KO mice were significantly elevated. Our findings highlight the importance of intestinal ZIP14 in regulating systemic manganese homeostasis.
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Affiliation(s)
- Ivo Florin Scheiber
- From the Department of Nutritional Sciences, University of Arizona, Tucson, Arizona 85721
| | - Yuze Wu
- From the Department of Nutritional Sciences, University of Arizona, Tucson, Arizona 85721
| | | | - Ningning Zhao
- From the Department of Nutritional Sciences, University of Arizona, Tucson, Arizona 85721
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34
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Hu T, Schreiter FC, Bagchi RA, Tatman PD, Hannink M, McKinsey TA. HDAC5 catalytic activity suppresses cardiomyocyte oxidative stress and NRF2 target gene expression. J Biol Chem 2019; 294:8640-8652. [PMID: 30962285 PMCID: PMC6544848 DOI: 10.1074/jbc.ra118.007006] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 03/21/2019] [Indexed: 01/19/2023] Open
Abstract
Histone deacetylase 5 (HDAC5) and HDAC9 are class IIa HDACs that function as signal-responsive repressors of the epigenetic program for pathological cardiomyocyte hypertrophy. The conserved deacetylase domains of HDAC5 and HDAC9 are not required for inhibition of cardiac hypertrophy. Thus, the biological function of class IIa HDAC catalytic activity in the heart remains unknown. Here we demonstrate that catalytic activity of HDAC5, but not HDAC9, suppresses mitochondrial reactive oxygen species generation and subsequent induction of NF-E2-related factor 2 (NRF2)-dependent antioxidant gene expression in cardiomyocytes. Treatment of cardiomyocytes with TMP195 or TMP269, which are selective class IIa HDAC inhibitors, or shRNA-mediated knockdown of HDAC5 but not HDAC9 leads to stimulation of NRF2-mediated transcription in a reactive oxygen species-dependent manner. Conversely, ectopic expression of catalytically active HDAC5 decreases cardiomyocyte oxidative stress and represses NRF2 activation. These findings establish a role of the catalytic domain of HDAC5 in the control of cardiomyocyte redox homeostasis and define TMP195 and TMP269 as a novel class of NRF2 activators that function by suppressing the enzymatic activity of an epigenetic regulator.
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Affiliation(s)
- Tianjing Hu
- Department of Medicine, Division of Cardiology and Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Friederike C Schreiter
- Department of Molecular Cardiology and Epigenetics, Heidelberg University, Heidelberg, Germany; German Centre for Cardiovascular Research, Heidelberg/Mannheim, Germany
| | - Rushita A Bagchi
- Department of Medicine, Division of Cardiology and Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Philip D Tatman
- Medical Scientist Training Program, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Mark Hannink
- Bond Life Sciences Center and Department of Biochemistry, University of Missouri, Columbia, Missouri 65211
| | - Timothy A McKinsey
- Department of Medicine, Division of Cardiology and Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045.
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35
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Gregg T, Sdao SM, Dhillon RS, Rensvold JW, Lewandowski SL, Pagliarini DJ, Denu JM, Merrins MJ. Obesity-dependent CDK1 signaling stimulates mitochondrial respiration at complex I in pancreatic β-cells. J Biol Chem 2019; 294:4656-4666. [PMID: 30700550 PMCID: PMC6433064 DOI: 10.1074/jbc.ra118.006085] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/25/2019] [Indexed: 12/18/2022] Open
Abstract
β-Cell mitochondria play a central role in coupling glucose metabolism with insulin secretion. Here, we identified a metabolic function of cyclin-dependent kinase 1 (CDK1)/cyclin B1-the activation of mitochondrial respiratory complex I-that is active in quiescent adult β-cells and hyperactive in β-cells from obese (ob/ob) mice. In WT islets, respirometry revealed that 65% of complex I flux and 49% of state 3 respiration is sensitive to CDK1 inhibition. Islets from ob/ob mice expressed more cyclin B1 and exhibited a higher sensitivity to CDK1 blockade, which reduced complex I flux by 76% and state 3 respiration by 79%. The ensuing reduction in mitochondrial NADH utilization, measured with two-photon NAD(P)H fluorescence lifetime imaging (FLIM), was matched in the cytosol by a lag in citrate cycling, as shown with a FRET reporter targeted to β-cells. Moreover, time-resolved measurements revealed that in ob/ob islets, where complex I flux dominates respiration, CDK1 inhibition is sufficient to restrict the duty cycle of ATP/ADP and calcium oscillations, the parameter that dynamically encodes β-cell glucose sensing. Direct complex I inhibition with rotenone mimicked the restrictive effects of CDK1 inhibition on mitochondrial respiration, NADH turnover, ATP/ADP, and calcium influx. These findings identify complex I as a critical mediator of obesity-associated metabolic remodeling in β-cells and implicate CDK1 as a regulator of complex I that enhances β-cell glucose sensing.
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Affiliation(s)
- Trillian Gregg
- From the Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism and
| | - Sophia M Sdao
- From the Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism and
| | - Rashpal S Dhillon
- Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53705
| | - Jarred W Rensvold
- Morgridge Institute for Research and Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53715, and
| | - Sophie L Lewandowski
- From the Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism and
| | - David J Pagliarini
- Morgridge Institute for Research and Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53715, and
| | - John M Denu
- Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53705
| | - Matthew J Merrins
- From the Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism and
- Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53705
- William S. Middleton Memorial Veterans Hospital, Madison, Wisconsin 53705
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36
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Piroli GG, Manuel AM, Patel T, Walla MD, Shi L, Lanci SA, Wang J, Galloway A, Ortinski PI, Smith DS, Frizzell N. Identification of Novel Protein Targets of Dimethyl Fumarate Modification in Neurons and Astrocytes Reveals Actions Independent of Nrf2 Stabilization. Mol Cell Proteomics 2019; 18:504-519. [PMID: 30587509 PMCID: PMC6398201 DOI: 10.1074/mcp.ra118.000922] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 12/01/2018] [Indexed: 12/15/2022] Open
Abstract
The fumarate ester dimethyl fumarate (DMF) has been introduced recently as a treatment for relapsing remitting multiple sclerosis (RRMS), a chronic inflammatory condition that results in neuronal demyelination and axonal loss. DMF is known to act by depleting intracellular glutathione and modifying thiols on Keap1 protein, resulting in the stabilization of the transcription factor Nrf2, which in turn induces the expression of antioxidant response element genes. We have previously shown that DMF reacts with a wide range of protein thiols, suggesting that the complete mechanisms of action of DMF are unknown. Here, we investigated other intracellular thiol residues that may also be irreversibly modified by DMF in neurons and astrocytes. Using mass spectrometry, we identified 24 novel proteins that were modified by DMF in neurons and astrocytes, including cofilin-1, tubulin and collapsin response mediator protein 2 (CRMP2). Using an in vitro functional assay, we demonstrated that DMF-modified cofilin-1 loses its activity and generates less monomeric actin, potentially inhibiting its cytoskeletal remodeling activity, which could be beneficial in the modulation of myelination during RRMS. DMF modification of tubulin did not significantly impact axonal lysosomal trafficking. We found that the oxygen consumption rate of N1E-115 neurons and the levels of proteins related to mitochondrial energy production were only slightly affected by the highest doses of DMF, confirming that DMF treatment does not impair cellular respiratory function. In summary, our work provides new insights into the mechanisms supporting the neuroprotective and remyelination benefits associated with DMF treatment in addition to the antioxidant response by Nrf2.
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Affiliation(s)
- Gerardo G Piroli
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Allison M Manuel
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Tulsi Patel
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Michael D Walla
- §Mass Spectrometry Center, Department of Chemistry & Biochemistry, University of South Carolina, Columbia, South Carolina 29205
| | - Liang Shi
- ¶Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29205
| | - Scott A Lanci
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Jingtian Wang
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Ashley Galloway
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Pavel I Ortinski
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209
| | - Deanna S Smith
- ¶Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29205
| | - Norma Frizzell
- From the ‡Department of Pharmacology, Physiology & Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina 29209;
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Zhang Z, Parker MP, Graw S, Novikova LV, Fedosyuk H, Fontes JD, Koestler DC, Peterson KR, Slawson C. O-GlcNAc homeostasis contributes to cell fate decisions during hematopoiesis. J Biol Chem 2019; 294:1363-1379. [PMID: 30523150 PMCID: PMC6349094 DOI: 10.1074/jbc.ra118.005993] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/29/2018] [Indexed: 11/06/2022] Open
Abstract
The addition of a single β-d-GlcNAc sugar (O-GlcNAc) by O-GlcNAc-transferase (OGT) and O-GlcNAc removal by O-GlcNAcase (OGA) maintain homeostatic O-GlcNAc levels on cellular proteins. Changes in protein O-GlcNAcylation regulate cellular differentiation and cell fate decisions, but how these changes affect erythropoiesis, an essential process in blood cell formation, remains unclear. Here, we investigated the role of O-GlcNAcylation in erythropoiesis by using G1E-ER4 cells, which carry the erythroid-specific transcription factor GATA-binding protein 1 (GATA-1) fused to the estrogen receptor (GATA-1-ER) and therefore undergo erythropoiesis after β-estradiol (E2) addition. We observed that during G1E-ER4 differentiation, overall O-GlcNAc levels decrease, and physical interactions of GATA-1 with both OGT and OGA increase. RNA-Seq-based transcriptome analysis of G1E-ER4 cells differentiated in the presence of the OGA inhibitor Thiamet-G (TMG) revealed changes in expression of 433 GATA-1 target genes. ChIP results indicated that the TMG treatment decreases the occupancy of GATA-1, OGT, and OGA at the GATA-binding site of the lysosomal protein transmembrane 5 (Laptm5) gene promoter. TMG also reduced the expression of genes involved in differentiation of NB4 and HL60 human myeloid leukemia cells, suggesting that O-GlcNAcylation is involved in the regulation of hematopoietic differentiation. Sustained treatment of G1E-ER4 cells with TMG before differentiation reduced hemoglobin-positive cells and increased stem/progenitor cell surface markers. Our results show that alterations in O-GlcNAcylation disrupt transcriptional programs controlling erythropoietic lineage commitment, suggesting a role for O-GlcNAcylation in regulating hematopoietic cell fate.
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Affiliation(s)
- Zhen Zhang
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160
| | - Matthew P Parker
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160
| | | | - Lesya V Novikova
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160
| | - Halyna Fedosyuk
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160
| | - Joseph D Fontes
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160; Cancer Center, University of Kansas Medical Center, Kansas City, Kansas 66160
| | - Devin C Koestler
- Biostatistics, Kansas City, Kansas 66160; Cancer Center, University of Kansas Medical Center, Kansas City, Kansas 66160
| | - Kenneth R Peterson
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160; Cancer Center, University of Kansas Medical Center, Kansas City, Kansas 66160; Anatomy and Cell Biology, Kansas City, Kansas 66160.
| | - Chad Slawson
- Departments of Biochemistry and Molecular Biology, Kansas City, Kansas 66160; Cancer Center, University of Kansas Medical Center, Kansas City, Kansas 66160.
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38
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Ohlemacher SI, Xu Y, Kober DL, Malik M, Nix JC, Brett TJ, Henderson JP. YbtT is a low-specificity type II thioesterase that maintains production of the metallophore yersiniabactin in pathogenic enterobacteria. J Biol Chem 2018; 293:19572-19585. [PMID: 30355735 PMCID: PMC6314147 DOI: 10.1074/jbc.ra118.005752] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 10/23/2018] [Indexed: 12/20/2022] Open
Abstract
Clinical isolates of Yersinia, Klebsiella, and Escherichia coli frequently secrete the small molecule metallophore yersiniabactin (Ybt), which passivates and scavenges transition metals during human infections. YbtT is encoded within the Ybt biosynthetic operon and is critical for full Ybt production in bacteria. However, its biosynthetic function has been unclear because it is not essential for Ybt production by the in vitro reconstituted nonribosomal peptide synthetase/polyketide synthase (NRPS/PKS) pathway. Here, we report the structural and biochemical characterization of YbtT. YbtT structures at 1.4-1.9 Å resolution possess a serine hydrolase catalytic triad and an associated substrate chamber with features similar to those previously reported for low-specificity type II thioesterases (TEIIs). We found that YbtT interacts with the two major Ybt biosynthetic proteins, HMWP1 (high-molecular-weight protein 1) and HMWP2 (high-molecular-weight protein 2), and hydrolyzes a variety of aromatic and acyl groups from their phosphopantetheinylated carrier protein domains. In vivo YbtT titration in uropathogenic E. coli revealed a distinct optimum for Ybt production consistent with a tradeoff between clearing both stalled inhibitory intermediates and productive Ybt precursors from HMWP1 and HMWP2. These results are consistent with a model in which YbtT maintains cellular Ybt biosynthesis by removing nonproductive, inhibitory thioesters that form aberrantly at multiple sites on HMWP1 and HMWP2.
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Affiliation(s)
- Shannon I Ohlemacher
- From the Center for Women's Infectious Diseases Research
- Division of Infectious Diseases
- Department of Internal Medicine, and
| | - Yiquan Xu
- From the Center for Women's Infectious Diseases Research
- Division of Infectious Diseases
- Department of Internal Medicine, and
| | - Daniel L Kober
- Department of Internal Medicine, and
- Division of Pulmonary and Critical Care Medicine
- Department of Cell Biology and Physiology, Washington University, St. Louis, Missouri 63110 and
| | - Mahnoor Malik
- From the Center for Women's Infectious Diseases Research
- Division of Infectious Diseases
- Department of Internal Medicine, and
| | - Jay C Nix
- the Molecular Biology Consortium, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Tom J Brett
- Department of Internal Medicine, and
- Division of Pulmonary and Critical Care Medicine
- Department of Cell Biology and Physiology, Washington University, St. Louis, Missouri 63110 and
| | - Jeffrey P Henderson
- From the Center for Women's Infectious Diseases Research,
- Division of Infectious Diseases
- Department of Internal Medicine, and
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39
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Sheng S, Chen J, Mukherjee A, Yates ME, Buck TM, Brodsky JL, Tolino MA, Hughey RP, Kleyman TR. Thumb domains of the three epithelial Na + channel subunits have distinct functions. J Biol Chem 2018; 293:17582-17592. [PMID: 30228189 PMCID: PMC6231141 DOI: 10.1074/jbc.ra118.003618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 09/13/2018] [Indexed: 01/10/2023] Open
Abstract
The epithelial Na+ channel (ENaC) possesses a large extracellular domain formed by a β-strand core enclosed by three peripheral α-helical subdomains, which have been dubbed thumb, finger, and knuckle. Here we asked whether the ENaC thumb domains play specific roles in channel function. To this end, we examined the characteristics of channels lacking a thumb domain in an individual ENaC subunit (α, β, or γ). Removing the γ subunit thumb domain had no effect on Na+ currents when expressed in Xenopus oocytes, but moderately reduced channel surface expression. In contrast, ENaCs lacking the α or β subunit thumb domain exhibited significantly reduced Na+ currents along with a large reduction in channel surface expression. Moreover, channels lacking an α or γ thumb domain exhibited a diminished Na+ self-inhibition response, whereas this response was retained in channels lacking a β thumb domain. In turn, deletion of the α thumb domain had no effect on the degradation rate of the immature α subunit as assessed by cycloheximide chase analysis. However, accelerated degradation of the immature β subunit and mature γ subunit was observed when the β or γ thumb domain was deleted, respectively. Our results suggest that the thumb domains in each ENaC subunit are required for optimal surface expression in oocytes and that the α and γ thumb domains both have important roles in the channel's inhibitory response to external Na+ Our findings support the notion that the extracellular helical domains serve as functional modules that regulate ENaC biogenesis and activity.
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Affiliation(s)
- Shaohu Sheng
- From the Renal-Electrolyte Division, Department of Medicine and
| | - Jingxin Chen
- From the Renal-Electrolyte Division, Department of Medicine and
| | | | | | | | | | | | - Rebecca P Hughey
- From the Renal-Electrolyte Division, Department of Medicine and
- Cell Biology
- Microbiology and Molecular Genetics, and
| | - Thomas R Kleyman
- From the Renal-Electrolyte Division, Department of Medicine and
- Cell Biology
- Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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40
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Stanfill BA, Nakayasu ES, Bramer LM, Thompson AM, Ansong CK, Clauss TR, Gritsenko MA, Monroe ME, Moore RJ, Orton DJ, Piehowski PD, Schepmoes AA, Smith RD, Webb-Robertson BJM, Metz TO. Quality Control Analysis in Real-time (QC-ART): A Tool for Real-time Quality Control Assessment of Mass Spectrometry-based Proteomics Data. Mol Cell Proteomics 2018; 17:1824-1836. [PMID: 29666158 PMCID: PMC6126382 DOI: 10.1074/mcp.ra118.000648] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/13/2018] [Indexed: 12/29/2022] Open
Abstract
Liquid chromatography-mass spectrometry (LC-MS)-based proteomics studies of large sample cohorts can easily require from months to years to complete. Acquiring consistent, high-quality data in such large-scale studies is challenging because of normal variations in instrumentation performance over time, as well as artifacts introduced by the samples themselves, such as those because of collection, storage and processing. Existing quality control methods for proteomics data primarily focus on post-hoc analysis to remove low-quality data that would degrade downstream statistics; they are not designed to evaluate the data in near real-time, which would allow for interventions as soon as deviations in data quality are detected. In addition to flagging analyses that demonstrate outlier behavior, evaluating how the data structure changes over time can aide in understanding typical instrument performance or identify issues such as a degradation in data quality because of the need for instrument cleaning and/or re-calibration. To address this gap for proteomics, we developed Quality Control Analysis in Real-Time (QC-ART), a tool for evaluating data as they are acquired to dynamically flag potential issues with instrument performance or sample quality. QC-ART has similar accuracy as standard post-hoc analysis methods with the additional benefit of real-time analysis. We demonstrate the utility and performance of QC-ART in identifying deviations in data quality because of both instrument and sample issues in near real-time for LC-MS-based plasma proteomics analyses of a sample subset of The Environmental Determinants of Diabetes in the Young cohort. We also present a case where QC-ART facilitated the identification of oxidative modifications, which are often underappreciated in proteomic experiments.
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Affiliation(s)
| | | | - Lisa M Bramer
- From the ‡Computational and Statistical Analytics Division
| | - Allison M Thompson
- ¶Environmental and Molecular Sciences Laboratory, 902 Battelle Blvd, Pacific Northwest National Laboratory, Richland, Washington
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41
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Lee JA, Wang Z, Sambo D, Bunting KD, Pallas DC. Global loss of leucine carboxyl methyltransferase-1 causes severe defects in fetal liver hematopoiesis. J Biol Chem 2018; 293:9636-9650. [PMID: 29735529 PMCID: PMC6016458 DOI: 10.1074/jbc.ra118.002012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 04/12/2018] [Indexed: 11/06/2022] Open
Abstract
Leucine carboxyl methyltransferase-1 (LCMT-1) methylates the C-terminal leucine α-carboxyl group of the catalytic subunits of the protein phosphatase 2A (PP2A) subfamily of protein phosphatases, PP2Ac, PP4c, and PP6c. LCMT-1 differentially regulates the formation and function of a subset of the heterotrimeric complexes that PP2A and PP4 form with their regulatory subunits. Global LCMT-1 knockout causes embryonic lethality in mice, but LCMT-1 function in development is unknown. In this study, we analyzed the effects of global LCMT-1 loss on embryonic development. LCMT-1 knockout causes loss of PP2Ac methylation, indicating that LCMT-1 is the sole PP2Ac methyltransferase. PP2A heterotrimers containing the Bα and Bδ B-type subunits are dramatically reduced in whole embryos, and the steady-state levels of PP2Ac and the PP2A structural A subunit are also down ∼30%. Strikingly, global loss of LCMT-1 causes severe defects in fetal hematopoiesis and usually death by embryonic day 16.5. Fetal livers of homozygous lcmt-1 knockout embryos display hypocellularity, elevated apoptosis, and greatly reduced numbers of hematopoietic stem and progenitor cell-enriched Kit+Lin-Sca1+ cells. The percent cycling cells and mitotic indices of WT and lcmt-1 knockout fetal liver cells are similar, suggesting that hypocellularity may be due to a combination of apoptosis and/or defects in specification, self-renewal, or survival of stem cells. Indicative of a possible intrinsic defect in stem cells, noncompetitive and competitive transplantation experiments reveal that lcmt-1 loss causes a severe multilineage hematopoietic repopulating defect. Therefore, this study reveals a novel role for LCMT-1 as a key player in fetal liver hematopoiesis.
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Affiliation(s)
- Jocelyn A Lee
- From the Department of Biochemistry, Winship Cancer Institute, the Biochemistry, Cell, and Developmental Graduate Program, and
| | - Zhengqi Wang
- the Aflac Cancer and Blood Disorders Center of Children's Healthcare of Atlanta, Department of Pediatrics, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Danielle Sambo
- From the Department of Biochemistry, Winship Cancer Institute, the Biochemistry, Cell, and Developmental Graduate Program, and
| | - Kevin D Bunting
- the Aflac Cancer and Blood Disorders Center of Children's Healthcare of Atlanta, Department of Pediatrics, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - David C Pallas
- From the Department of Biochemistry, Winship Cancer Institute, the Biochemistry, Cell, and Developmental Graduate Program, and
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Sakabe T, Sakai K, Maeda T, Sunaga A, Furuta N, Schweitzer R, Sasaki T, Sakai T. Transcription factor scleraxis vitally contributes to progenitor lineage direction in wound healing of adult tendon in mice. J Biol Chem 2018; 293:5766-5780. [PMID: 29507095 PMCID: PMC5912447 DOI: 10.1074/jbc.ra118.001987] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 02/16/2018] [Indexed: 01/02/2023] Open
Abstract
Tendon is a dense connective tissue that transmits high mechanical forces from skeletal muscle to bone. The transcription factor scleraxis (Scx) is a highly specific marker of both precursor and mature tendon cells (tenocytes). Mice lacking scx exhibit a specific and virtually complete loss of tendons during development. However, the functional contribution of Scx to wound healing in adult tendon has not yet been fully characterized. Here, using ScxGFP-tracking and loss-of-function systems, we show in an adult mouse model of Achilles tendon injury that paratenon cells, representing a stem cell antigen-1 (Sca-1)-positive and Scx-negative progenitor subpopulation, display Scx induction, migrate to the wound site, and produce extracellular matrix (ECM) to bridge the defect, whereas resident tenocytes exhibit a delayed response. Scx induction in the progenitors is initiated by transforming growth factor β (TGF-β) signaling. scx-deficient mice had migration of Sca-1-positive progenitor cell to the lesion site but impaired ECM assembly to bridge the defect. Mechanistically, scx-null progenitors displayed higher chondrogenic potential with up-regulation of SRY-box 9 (Sox9) coactivator PPAR-γ coactivator-1α (PGC-1α) in vitro, and knock-in analysis revealed that forced expression of full-length scx significantly inhibited Sox9 expression. Accordingly, scx-null wounds formed cartilage-like tissues that developed ectopic ossification. Our findings indicate a critical role of Scx in a progenitor-cell lineage in wound healing of adult mouse tendon. These progenitor cells could represent targets in strategies to facilitate tendon repair. We propose that this lineage-regulatory mechanism in tissue progenitors could apply to a broader set of tissues or biological systems in the body.
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Affiliation(s)
- Tomoya Sakabe
- From the Medical Research Council Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3GE, United Kingdom
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Keiko Sakai
- From the Medical Research Council Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3GE, United Kingdom
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Toru Maeda
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Ataru Sunaga
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Nao Furuta
- From the Medical Research Council Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3GE, United Kingdom
| | - Ronen Schweitzer
- Research Division, Shriners Hospital for Children, Portland, Oregon 97239, and
| | - Takako Sasaki
- Department of Biochemistry, Faculty of Medicine, Oita University, Oita 879-5593, Japan
| | - Takao Sakai
- From the Medical Research Council Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3GE, United Kingdom,
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
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Bhattacharyya S, Ali M, Smith WH, Minkler PE, Stoll MS, Hoppel CL, Adams SH. Anesthesia and bariatric surgery gut preparation alter plasma acylcarnitines reflective of mitochondrial fat and branched-chain amino acid oxidation. Am J Physiol Endocrinol Metab 2017; 313:E690-E698. [PMID: 28830869 PMCID: PMC5814600 DOI: 10.1152/ajpendo.00222.2017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 08/14/2017] [Accepted: 08/14/2017] [Indexed: 01/08/2023]
Abstract
The period around bariatric surgery offers a unique opportunity to characterize metabolism responses to dynamic shifts in energy, gut function, and anesthesia. We analyzed plasma acylcarnitines in obese women (n = 17) sampled in the overnight fasted/postabsorptive state approximately 1-2 wk before surgery (condition A), the morning of surgery (prior restriction to a 48-h clear liquid diet coupled in some cases a standard polyethylene glycol gut evacuation: condition B), and following induction of anesthesia (condition C). Comparisons tested if 1) plasma acylcarnitine derivatives reflective of fatty acid oxidation (FAO) and xenometabolism would be significantly increased and decreased, respectively, by preoperative gut preparation/negative energy balance (condition A vs. B), and 2) anesthesia would acutely depress markers of FAO. Acylcarnitines associated with fat mobilization and FAO were significantly increased in condition B: long-chain acylcarnitines (i.e., C18:1, ~70%), metabolites from active but incomplete FAO [i.e., C14:1 (161%) and C14:2 (102%)] and medium- to short-chain acylcarnitines [i.e., C2 (91%), R-3-hydroxybutyryl-(245%), C6 (45%), and cis-3,4-methylene-heptanoyl-(17%), etc.]. Branched-chain amino acid markers displayed disparate patterns [i.e., isobutyryl-(40% decreased) vs. isovaleryl carnitine (51% increased)]. Anesthesia reduced virtually every acylcarnitine. These results are consistent with a fasting-type metabolic phenotype coincident with the presurgical "gut preparation" phase of bariatric surgery, and a major and rapid alteration of both fat and amino acid metabolism with onset of anesthesia. Whether presurgical or anesthesia-associated metabolic shifts in carnitine and fuel metabolism impact patient outcomes or surgical risks remains to be evaluated experimentally.
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Affiliation(s)
- Sudeepa Bhattacharyya
- Arkansas Children's Nutrition Center, Little Rock, Arkansas
- Department of Pediatrics, University of Arkansas for Medical Science, Little Rock, Arkansas
| | - Mohamed Ali
- Department of Surgery, University of California, Davis School of Medicine, Sacramento, California; and
| | - William H Smith
- Department of Surgery, University of California, Davis School of Medicine, Sacramento, California; and
| | - Paul E Minkler
- Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio
| | - Maria S Stoll
- Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio
| | - Charles L Hoppel
- Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio
| | - Sean H Adams
- Arkansas Children's Nutrition Center, Little Rock, Arkansas;
- Department of Pediatrics, University of Arkansas for Medical Science, Little Rock, Arkansas
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