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Gall CM, Le AA, Lynch G. Sex differences in synaptic plasticity underlying learning. J Neurosci Res 2023; 101:764-782. [PMID: 33847004 PMCID: PMC10337639 DOI: 10.1002/jnr.24844] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 03/23/2021] [Indexed: 11/09/2022]
Abstract
Although sex differences in learning behaviors are well documented, sexual dimorphism in the synaptic processes of encoding is only recently appreciated. Studies in male rodents have built upon the discovery of long-term potentiation (LTP), and acceptance of this activity-dependent increase in synaptic strength as a mechanism of encoding, to identify synaptic receptors and signaling activities that coordinate the activity-dependent remodeling of the subsynaptic actin cytoskeleton that is critical for enduring potentiation and memory. These molecular substrates together with other features of LTP, as characterized in males, have provided an explanation for a range of memory phenomena including multiple stages of consolidation, the efficacy of spaced training, and the location of engrams at the level of individual synapses. In the present report, we summarize these findings and describe more recent results from our laboratories showing that in females the same actin regulatory mechanisms are required for hippocampal LTP and memory but, in females only, the engagement of both modulatory receptors such as TrkB and synaptic signaling intermediaries including Src and ERK1/2 requires neuron-derived estrogen and signaling through membrane-associated estrogen receptor α (ERα). Moreover, in association with the additional ERα involvement, females exhibit a higher threshold for hippocampal LTP and spatial learning. We propose that the distinct LTP threshold in females contributes to as yet unappreciated sex differences in information processing and features of learning and memory.
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Affiliation(s)
- Christine M. Gall
- Department of Anatomy and Neurobiology, University of California, Irvine, CA, USA
- Department of Neurobiology and Behavior, University of California, Irvine, CA, USA
| | - Aliza A. Le
- Department of Anatomy and Neurobiology, University of California, Irvine, CA, USA
| | - Gary Lynch
- Department of Anatomy and Neurobiology, University of California, Irvine, CA, USA
- Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
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2
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Li Q, Dibus M, Casey A, Yee CSK, Vargas SO, Luo S, Rosen SM, Madden JA, Genetti CA, Brabek J, Brownstein CA, Kazerounian S, Raby BA, Schmitz-Abe K, Kennedy JC, Fishman MP, Mullen MP, Taylor JM, Rosel D, Agrawal PB. A homozygous stop-gain variant in ARHGAP42 is associated with childhood interstitial lung disease, systemic hypertension, and immunological findings. PLoS Genet 2021; 17:e1009639. [PMID: 34232960 PMCID: PMC8289122 DOI: 10.1371/journal.pgen.1009639] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 07/19/2021] [Accepted: 06/02/2021] [Indexed: 11/18/2022] Open
Abstract
ARHGAP42 encodes Rho GTPase activating protein 42 that belongs to a member of the GTPase Regulator Associated with Focal Adhesion Kinase (GRAF) family. ARHGAP42 is involved in blood pressure control by regulating vascular tone. Despite these findings, disorders of human variants in the coding part of ARHGAP42 have not been reported. Here, we describe an 8-year-old girl with childhood interstitial lung disease (chILD), systemic hypertension, and immunological findings who carries a homozygous stop-gain variant (c.469G>T, p.(Glu157Ter)) in the ARHGAP42 gene. The family history is notable for both parents with hypertension. Histopathological examination of the proband lung biopsy showed increased mural smooth muscle in small airways and alveolar septa, and concentric medial hypertrophy in pulmonary arteries. ARHGAP42 stop-gain variant in the proband leads to exon 5 skipping, and reduced ARHGAP42 levels, which was associated with enhanced RhoA and Cdc42 expression. This is the first report linking a homozygous stop-gain variant in ARHGAP42 with a chILD disorder, systemic hypertension, and immunological findings in human patient. Evidence of smooth muscle hypertrophy on lung biopsy and an increase in RhoA/ROCK signaling in patient cells suggests the potential mechanistic link between ARHGAP42 deficiency and the development of chILD disorder.
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Affiliation(s)
- Qifei Li
- Division of Newborn Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Michal Dibus
- Department of Cell Biology, Charles University in Prague, Viničná 7, Prague, Czech Republic
- Department of Cell Biology, Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, Vestec u Prahy, Czech Republic
| | - Alicia Casey
- Division of Pulmonary Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Christina S. K. Yee
- Division of Immunology, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Sara O. Vargas
- Department of Pathology, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Shiyu Luo
- Division of Newborn Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Samantha M. Rosen
- Division of Newborn Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jill A. Madden
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Casie A. Genetti
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jan Brabek
- Department of Cell Biology, Charles University in Prague, Viničná 7, Prague, Czech Republic
- Department of Cell Biology, Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, Vestec u Prahy, Czech Republic
| | - Catherine A. Brownstein
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Shideh Kazerounian
- Division of Newborn Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Benjamin A. Raby
- Division of Pulmonary Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Klaus Schmitz-Abe
- Division of Newborn Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - John C. Kennedy
- Division of Pulmonary Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Pathology, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Martha P. Fishman
- Division of Pulmonary Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Mary P. Mullen
- Department of Cardiology, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Joan M. Taylor
- Dept. Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Daniel Rosel
- Department of Cell Biology, Charles University in Prague, Viničná 7, Prague, Czech Republic
- Department of Cell Biology, Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, Vestec u Prahy, Czech Republic
| | - Pankaj B. Agrawal
- Division of Newborn Medicine, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Genetics and Genomics, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- The Manton Center for Orphan Disease Research, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
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Linklater ES, Duncan ED, Han KJ, Kaupinis A, Valius M, Lyons TR, Prekeris R. Rab40-Cullin5 complex regulates EPLIN and actin cytoskeleton dynamics during cell migration. J Cell Biol 2021; 220:212111. [PMID: 33999101 PMCID: PMC8129794 DOI: 10.1083/jcb.202008060] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 02/09/2021] [Accepted: 04/26/2021] [Indexed: 12/12/2022] Open
Abstract
Rab40b is a SOCS box–containing protein that regulates the secretion of MMPs to facilitate extracellular matrix remodeling during cell migration. Here, we show that Rab40b interacts with Cullin5 via the Rab40b SOCS domain. We demonstrate that loss of Rab40b–Cullin5 binding decreases cell motility and invasive potential and show that defective cell migration and invasion stem from alteration to the actin cytoskeleton, leading to decreased invadopodia formation, decreased actin dynamics at the leading edge, and an increase in stress fibers. We also show that these stress fibers anchor at less dynamic, more stable focal adhesions. Mechanistically, changes in the cytoskeleton and focal adhesion dynamics are mediated in part by EPLIN, which we demonstrate to be a binding partner of Rab40b and a target for Rab40b–Cullin5-dependent localized ubiquitylation and degradation. Thus, we propose a model where Rab40b–Cullin5-dependent ubiquitylation regulates EPLIN localization to promote cell migration and invasion by altering focal adhesion and cytoskeletal dynamics.
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Affiliation(s)
- Erik S Linklater
- Department of Cell and Developmental Biology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Emily D Duncan
- Department of Cell and Developmental Biology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Ke-Jun Han
- Department of Cell and Developmental Biology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Algirdas Kaupinis
- Proteomics Center, Institute of Biochemistry, Vilnius University Life Sciences Center, Vilnius, Lithuania
| | - Mindaugas Valius
- Proteomics Center, Institute of Biochemistry, Vilnius University Life Sciences Center, Vilnius, Lithuania
| | - Traci R Lyons
- Division of Medical Oncology, Department of Medicine, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO.,University of Colorado Cancer Center, Young Women's Breast Cancer Translational Program, Aurora, CO
| | - Rytis Prekeris
- Department of Cell and Developmental Biology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO
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4
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Cheah JS, Jacobs KA, Lai TW, Caballelo R, Yee JL, Ueda S, Heinrich V, Yamada S. Spatial proximity of proteins surrounding zyxin under force-bearing conditions. Mol Biol Cell 2021; 32:1221-1228. [PMID: 33909446 PMCID: PMC8351546 DOI: 10.1091/mbc.e19-10-0568] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Sensing physical forces is a critical first step in mechano-transduction of cells. Zyxin, a LIM domain-containing protein, is recruited to force-bearing actin filaments and is thought to repair and strengthen them. Yet, the precise force-induced protein interactions surrounding zyxin remain unclear. Using BioID analysis, we identified proximal proteins surrounding zyxin under normal and force-bearing conditions by label-free mass spectrometry analysis. Under force-bearing conditions, increased biotinylation of α-actinin 1, α-actinin 4, and AFAP1 were detected, and these proteins accumulated along force-bearing actin fibers independently from zyxin, albeit at a lower intensity than zyxin. VASP also accumulated along force-bearing actin fibers in a zyxin-dependent manner, but the biotinylation of VASP remained constant regardless of force, supporting the model of a free zyxin-VASP complex in the cytoplasm being corecruited to tensed actin fibers. In addition, ARHGAP42, a RhoA GAP, was also identified as a proximal protein of zyxin and colocalized with zyxin along contractile actin bundles. The overexpression of ARHGAP42 reduced the rate of small wound closure, a zyxin-dependent process. These results demonstrate that the application of proximal biotinylation can resolve the proximity and composition of protein complexes as a function of force, which had not been possible with traditional biochemical analysis.
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Affiliation(s)
- Joleen S Cheah
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616.,Biosciences Program, Stanford University, Stanford, CA 94305
| | - Kyle A Jacobs
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616
| | - Tzu Wei Lai
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616
| | - Reca Caballelo
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616
| | - Jacqueline L Yee
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616
| | - Shuji Ueda
- Graduate School of Agricultural Science, Kobe University, Kobe, Japan 657
| | - Volkmar Heinrich
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616
| | - Soichiro Yamada
- Biomedical Engineering Department, University of California Davis, Davis, CA 95616
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5
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The role of ARHGAP9: clinical implication and potential function in acute myeloid leukemia. J Transl Med 2021; 19:65. [PMID: 33579308 PMCID: PMC7881617 DOI: 10.1186/s12967-021-02733-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/01/2021] [Indexed: 12/16/2022] Open
Abstract
Background Rho GTPase activating protein 9 (ARHGAP9) is expressed in various types of cancers and can inactivate Rho GTPases that mainly regulate cytoskeletal dynamics. However, the exact role of ARHGAP9 in acute myeloid leukemia (AML) has yet to be clarified. Methods We compared the transcriptional expression, prognosis, differentially expressed genes, functional enrichment, and hub genes in AML patients on the basis of the data published in the following databases: UALCAN, GEPIA, Gene Expression Omnibus, the Human Protein Atlas, Cancer Cell Line Encyclopedia, LinkedOmics, Metascape, and String. Data from the Cancer Genome Atlas database was used to evaluate the correlations between ARHGAP9 expression and various clinicopathological parameters, as well as the significantly different genes associated with ARHGAP9 expression. Results We found that ARHGAP9 expression was higher in the tissues and cell lines extracted from patients with AML than corresponding control tissues and other cancer types. ARHGAP9 overexpression was associated with decreased overall survival (OS) in AML. Compared with the ARHGAP9low group, the ARHGAP9high group, which received only chemotherapy, showed significantly worse OS and event-free survival (EFS); however, no significant difference was observed after treatment with autologous or allogeneic hematopoietic stem cell transplantation (auto/allo-HSCT). The ARHGAP9high patients undergoing auto/allo-HSCT also had a significantly better prognosis with respect to OS and EFS than those receiving only chemotherapy. Most overlapping genes of the significantly different genes and co-expression genes exhibited enriched immune functions, suggesting the immune regulation potential of ARHGAP9 in AML. A total of 32 hub genes were identified from the differentially expressed genes, within which the KIF20A had a significant prognostic value for AML. Conclusions ARHGAP9 overexpression was associated with poor OS in AML patients and can be used as a prognostic biomarker. AML patients with ARHGAP9 overexpression can benefit from auto/allo-HSCT rather than chemotherapy.
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6
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Dibus M, Brábek J, Rösel D. A Screen for PKN3 Substrates Reveals an Activating Phosphorylation of ARHGAP18. Int J Mol Sci 2020; 21:ijms21207769. [PMID: 33092266 PMCID: PMC7594087 DOI: 10.3390/ijms21207769] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/16/2020] [Accepted: 10/17/2020] [Indexed: 12/13/2022] Open
Abstract
Protein kinase N3 (PKN3) is a serine/threonine kinase implicated in tumor progression of multiple cancer types, however, its substrates and effector proteins still remain largely understudied. In the present work we aimed to identify novel PKN3 substrates in a phosphoproteomic screen using analog sensitive PKN3. Among the identified putative substrates we selected ARHGAP18, a protein from RhoGAP family, for validation of the screen and further study. We confirmed that PKN3 can phosphorylate ARHGAP18 in vitro and we also characterized the interaction of the two proteins, which is mediated via the N-terminal part of ARHGAP18. We present strong evidence that PKN3-ARHGAP18 interaction is increased upon ARHGAP18 phosphorylation and that the phosphorylation of ARHGAP18 by PKN3 enhances its GAP domain activity and contributes to negative regulation of active RhoA. Taken together, we identified new set of potential PKN3 substrates and revealed a new negative feedback regulatory mechanism of Rho signaling mediated by PKN3-induced ARHGAP18 activation.
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Affiliation(s)
- Michal Dibus
- Department of Cell Biology, Charles University, Viničná 7, 12800 Prague, Czech Republic; (M.D.); (J.B.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 25242 Vestec u Prahy, Czech Republic
| | - Jan Brábek
- Department of Cell Biology, Charles University, Viničná 7, 12800 Prague, Czech Republic; (M.D.); (J.B.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 25242 Vestec u Prahy, Czech Republic
| | - Daniel Rösel
- Department of Cell Biology, Charles University, Viničná 7, 12800 Prague, Czech Republic; (M.D.); (J.B.)
- Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (BIOCEV), Průmyslová 595, 25242 Vestec u Prahy, Czech Republic
- Correspondence:
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Jiang K, Liu P, Xu H, Liang D, Fang K, Du S, Cheng W, Ye L, Liu T, Zhang X, Gong P, Shao S, Wang Y, Meng S. SASH1 suppresses triple-negative breast cancer cell invasion through YAP-ARHGAP42-actin axis. Oncogene 2020; 39:5015-5030. [PMID: 32523092 DOI: 10.1038/s41388-020-1356-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 05/31/2020] [Accepted: 06/04/2020] [Indexed: 11/09/2022]
Abstract
Triple-negative breast cancer (TNBC) is extremely aggressive and lacks effective therapy. SAM and SH3 domain containing1 (SASH1) has been implicated in TNBC as a candidate tumor suppressor; however, the mechanisms of action of SASH1 in TNBC remain underexplored. Here, we show that SASH1 was significantly downregulated in TNBC patients samples compared with other subtypes of breast cancer. Ectopic SASH1 expression inhibited, while depletion of SASH1 enhanced, the invasive phenotype of TNBC cells, accompanied by deregulated expression of MMP2 and MMP9. The functional effects of SASH1 depletion were confirmed in the chicken chorioallantoic membrane and mouse xenograft models. Mechanistically, SASH1 knockdown downregulated the phosphorylation levels of the Hippo kinase LATS1 and its effector YAP (Yes associated protein), thereby upregulating YAP accumulation together with its downstream target CYR61. Consistently, forced SASH1 expression exhibited opposite effects. Pharmacological inhibition of YAP or knockdown of YAP reversed the enhanced cell invasion of TNBC cells following SASH1 depletion. Furthermore, SASH1-induced YAP signaling was LATS1-dependent, which in reverse enhanced phosphorylation of SASH1. The SASH1 S407A mutant (phosphorylation deficient) failed to rescue the altered YAP signaling by SASH1 knockdown. Notably, SASH1 depletion upregulated ARHGAP42 levels via YAP-TEAD and the YAP-ARHGAP42-actin axis contributed to SASH1-regulated TNBC cell invasion. Therefore, our findings uncover a new mechanism for the tumor-suppressive activity of SASH1 in TNBC, which may serve as a novel target for therapeutic intervention.
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Affiliation(s)
- Ke Jiang
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Peng Liu
- Department of General Surgery, Shenzhen University General Hospital, 518055, Shenzhen, China
- Carson International Cancer Research Centre, Shenzhen University School of Medicine, 518055, Shenzhen, China
| | - Huizhe Xu
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Dapeng Liang
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Kun Fang
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Sha Du
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Wei Cheng
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Leiguang Ye
- Department of Oncology, Harbin Medical University Cancer Hospital, 150000, Harbin, China
| | - Tong Liu
- Department of Breast Surgery, Harbin Medical University Cancer Hospital, 150000, Harbin, China
| | - Xiaohong Zhang
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China
| | - Peng Gong
- Department of General Surgery, Shenzhen University General Hospital, 518055, Shenzhen, China
- Carson International Cancer Research Centre, Shenzhen University School of Medicine, 518055, Shenzhen, China
| | - Shujuan Shao
- Key Laboratory of Proteomics, Dalian Medical University, 116044, Dalian, China.
| | - Yifei Wang
- Department of Obstetrics and Gynecology, the Second Affiliated Hospital of Dalian Medical University, 116027, Dalian, China.
| | - Songshu Meng
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, 116044, Dalian, China.
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Molecular Regulation of the RhoGAP GRAF3 and Its Capacity to Limit Blood Pressure In Vivo. Cells 2020; 9:cells9041042. [PMID: 32331391 PMCID: PMC7226614 DOI: 10.3390/cells9041042] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/20/2020] [Indexed: 12/26/2022] Open
Abstract
Anti-hypertensive therapies are usually prescribed empirically and are often ineffective. Given the prevalence and deleterious outcomes of hypertension (HTN), improved strategies are needed. We reported that the Rho-GAP GRAF3 is selectively expressed in smooth muscle cells (SMC) and controls blood pressure (BP) by limiting the RhoA-dependent contractility of resistance arterioles. Importantly, genetic variants at the GRAF3 locus controls BP in patients. The goal of this study was to validate GRAF3 as a druggable candidate for future anti-HTN therapies. Importantly, using a novel mouse model, we found that modest induction of GRAF3 in SMC significantly decreased basal and vasoconstrictor-induced BP. Moreover, we found that GRAF3 protein toggles between inactive and active states by processes controlled by the mechano-sensing kinase, focal adhesion kinase (FAK). Using resonance energy transfer methods, we showed that agonist-induced FAK-dependent phosphorylation at Y376GRAF3 reverses an auto-inhibitory interaction between the GAP and BAR-PH domains. Y376 is located in a linker between the PH and GAP domains and is invariant in GRAF3 homologues and a phosphomimetic E376GRAF3 variant exhibited elevated GAP activity. Collectively, these data provide strong support for the future identification of allosteric activators of GRAF3 for targeted anti-hypertensive therapies.
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9
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Berger A, Le Fourn V, Masternak J, Regamey A, Bodenmann I, Girod P, Mermod N. Overexpression of transcription factor Foxa1 and target genes remediate therapeutic protein production bottlenecks in Chinese hamster ovary cells. Biotechnol Bioeng 2020; 117:1101-1116. [PMID: 31956982 PMCID: PMC7079004 DOI: 10.1002/bit.27274] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 12/27/2019] [Accepted: 01/12/2020] [Indexed: 12/13/2022]
Abstract
Despite extensive research conducted to increase protein production from Chinese hamster ovary (CHO) cells, cellular bottlenecks often remain, hindering high yields. In this study, a transcriptomic analysis led to the identification of 32 genes that are consistently upregulated in high producer clones and thus might mediate high productivity. Candidate genes were associated with functions such as signaling, protein folding, cytoskeleton organization, and cell survival. We focused on two engineering targets, Erp27, which binds unfolded proteins and the Erp57 disulfide isomerase in the endoplasmic reticulum, and Foxa1, a pioneering transcription factor involved in organ development. Erp27 moderate overexpression increased production of an easy-to-express antibody, whereas Erp27 and Erp57 co-overexpression increased cell density, viability, and the yield of difficult-to-express proteins. Foxa1 overexpression increased cell density, cell viability, and easy- and difficult-to-express protein yields, whereas it decreased reactive oxygen species late in fed-batch cultures. Foxa1 overexpression upregulated two other candidate genes that increased the production of difficult- and/or easy-to-express proteins, namely Ca3, involved in protecting cells from oxidative stress, and Tagap, involved in signaling and cytoskeleton remodeling. Overall, several genes allowing to overcome CHO cell bottlenecks were identified, including Foxa1, which mediated multiple favorable metabolic changes that improve therapeutic protein yields.
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Affiliation(s)
- Audrey Berger
- Department of Fundamental Microbiology, Institute of BiotechnologyUniversity of LausanneLausanneSwitzerland
- Present address: Laboratory of Microsystems LMIS4Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | | | - Jacqueline Masternak
- Department of Fundamental Microbiology, Institute of BiotechnologyUniversity of LausanneLausanneSwitzerland
| | | | | | | | - Nicolas Mermod
- Department of Fundamental Microbiology, Institute of BiotechnologyUniversity of LausanneLausanneSwitzerland
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Koudelková L, Pataki AC, Tolde O, Pavlik V, Nobis M, Gemperle J, Anderson K, Brábek J, Rosel D. Novel FRET-Based Src Biosensor Reveals Mechanisms of Src Activation and Its Dynamics in Focal Adhesions. Cell Chem Biol 2019; 26:255-268.e4. [DOI: 10.1016/j.chembiol.2018.10.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/12/2018] [Accepted: 10/26/2018] [Indexed: 10/27/2022]
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11
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Dee RA, Mangum KD, Bai X, Mack CP, Taylor JM. Druggable targets in the Rho pathway and their promise for therapeutic control of blood pressure. Pharmacol Ther 2019; 193:121-134. [PMID: 30189292 PMCID: PMC7235948 DOI: 10.1016/j.pharmthera.2018.09.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The prevalence of high blood pressure (also known as hypertension) has steadily increased over the last few decades. Known as a silent killer, hypertension increases the risk for cardiovascular disease and can lead to stroke, heart attack, kidney failure and associated sequela. While numerous hypertensive therapies are currently available, it is estimated that only half of medicated patients exhibit blood pressure control. This signifies the need for a better understanding of the underlying cause of disease and for more effective therapies. While blood pressure homeostasis is very complex and involves the integrated control of multiple body systems, smooth muscle contractility and arterial resistance are important contributors. Strong evidence from pre-clinical animal models and genome-wide association studies indicate that smooth muscle contraction and BP homeostasis are governed by the small GTPase RhoA and its downstream target, Rho kinase. In this review, we summarize the signaling pathways and regulators that impart tight spatial-temporal control of RhoA activity in smooth muscle cells and discuss current therapeutic strategies to target these RhoA pathway components. We also discuss known allelic variations in the RhoA pathway and consider how these polymorphisms may affect genetic risk for hypertension and its clinical manifestations.
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Affiliation(s)
- Rachel A Dee
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Kevin D Mangum
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Xue Bai
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Christopher P Mack
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599, USA; McAllister Heart Institute, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Joan M Taylor
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599, USA; McAllister Heart Institute, University of North Carolina, Chapel Hill, NC 27599, USA.
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BAR domain proteins-a linkage between cellular membranes, signaling pathways, and the actin cytoskeleton. Biophys Rev 2018; 10:1587-1604. [PMID: 30456600 DOI: 10.1007/s12551-018-0467-7] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 10/17/2018] [Indexed: 12/23/2022] Open
Abstract
Actin filament assembly typically occurs in association with cellular membranes. A large number of proteins sit at the interface between actin networks and membranes, playing diverse roles such as initiation of actin polymerization, modulation of membrane curvature, and signaling. Bin/Amphiphysin/Rvs (BAR) domain proteins have been implicated in all of these functions. The BAR domain family of proteins comprises a diverse group of multi-functional effectors, characterized by their modular architecture. In addition to the membrane-curvature sensing/inducing BAR domain module, which also mediates antiparallel dimerization, most contain auxiliary domains implicated in protein-protein and/or protein-membrane interactions, including SH3, PX, PH, RhoGEF, and RhoGAP domains. The shape of the BAR domain itself varies, resulting in three major subfamilies: the classical crescent-shaped BAR, the more extended and less curved F-BAR, and the inverse curvature I-BAR subfamilies. Most members of this family have been implicated in cellular functions that require dynamic remodeling of the actin cytoskeleton, such as endocytosis, organelle trafficking, cell motility, and T-tubule biogenesis in muscle cells. Here, we review the structure and function of mammalian BAR domain proteins and the many ways in which they are interconnected with the actin cytoskeleton.
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13
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Aspenström P. BAR Domain Proteins Regulate Rho GTPase Signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1111:33-53. [PMID: 30151649 DOI: 10.1007/5584_2018_259] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The Bin-Amphiphysin-Rvs (BAR) domain is a membrane lipid binding domain present in a wide variety of proteins, often proteins with a role in Rho-regulated signaling pathways. BAR domains do not only confer binding to lipid bilayers, they also possess a membrane sculpturing ability and thereby directly control the topology of biomembranes. BAR domain-containing proteins participate in a plethora of physiological processes but the common denominator is their capacity to link membrane dynamics to actin dynamics and thereby integrate processes such as endocytosis, exocytosis, vesicle trafficking, cell morphogenesis and cell migration. The Rho family of small GTPases constitutes an important bridging theme for many BAR domain-containing proteins. This review article will focus predominantly on the role of BAR proteins as regulators or effectors of Rho GTPases and it will only briefly discuss the structural and biophysical function of the BAR domains.
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Affiliation(s)
- Pontus Aspenström
- Department of Microbiology, and Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.
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