1
|
Rizk R, Devost D, Pétrin D, Hébert TE. KCTD Proteins Have Redundant Functions in Controlling Cellular Growth. Int J Mol Sci 2024; 25:4993. [PMID: 38732215 PMCID: PMC11084553 DOI: 10.3390/ijms25094993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/23/2024] [Accepted: 04/29/2024] [Indexed: 05/13/2024] Open
Abstract
We explored the functional redundancy of three structurally related KCTD (Potassium Channel Tetramerization Domain) proteins, KCTD2, KCTD5, and KCTD17, by progressively knocking them out in HEK 293 cells using CRISPR/Cas9 genome editing. After validating the knockout, we assessed the effects of progressive knockout on cell growth and gene expression. We noted that the progressive effects of knockout of KCTD isoforms on cell growth were most pervasive when all three isoforms were deleted, suggesting some functions were conserved between them. This was also reflected in progressive changes in gene expression. Our previous work indicated that Gβ1 was involved in the transcriptional control of gene expression, so we compared the gene expression patterns between GNB1 and KCTD KO. Knockout of GNB1 led to numerous changes in the expression levels of other G protein subunit genes, while knockout of KCTD isoforms had the opposite effect, presumably because of their role in regulating levels of Gβ1. Our work demonstrates a unique relationship between KCTD proteins and Gβ1 and a global role for this subfamily of KCTD proteins in maintaining the ability of cells to survive and proliferate.
Collapse
Affiliation(s)
| | | | | | - Terence E. Hébert
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Room 1303, Montréal, QC H3G 1Y6, Canada; (R.R.); (D.D.); (D.P.)
| |
Collapse
|
2
|
Nguyen DM, Rath DH, Devost D, Pétrin D, Rizk R, Ji AX, Narayanan N, Yong D, Zhai A, Kuntz DA, Mian MUQ, Pomroy NC, Keszei AFA, Benlekbir S, Mazhab-Jafari MT, Rubinstein JL, Hébert TE, Privé GG. Structure and dynamics of a pentameric KCTD5/CUL3/Gβγ E3 ubiquitin ligase complex. Proc Natl Acad Sci U S A 2024; 121:e2315018121. [PMID: 38625940 PMCID: PMC11047111 DOI: 10.1073/pnas.2315018121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 03/07/2024] [Indexed: 04/18/2024] Open
Abstract
Heterotrimeric G proteins can be regulated by posttranslational modifications, including ubiquitylation. KCTD5, a pentameric substrate receptor protein consisting of an N-terminal BTB domain and a C-terminal domain, engages CUL3 to form the central scaffold of a cullin-RING E3 ligase complex (CRL3KCTD5) that ubiquitylates Gβγ and reduces Gβγ protein levels in cells. The cryo-EM structure of a 5:5:5 KCTD5/CUL3NTD/Gβ1γ2 assembly reveals a highly dynamic complex with rotations of over 60° between the KCTD5BTB/CUL3NTD and KCTD5CTD/Gβγ moieties of the structure. CRL3KCTD5 engages the E3 ligase ARIH1 to ubiquitylate Gβγ in an E3-E3 superassembly, and extension of the structure to include full-length CUL3 with RBX1 and an ARIH1~ubiquitin conjugate reveals that some conformational states position the ARIH1~ubiquitin thioester bond to within 10 Å of lysine-23 of Gβ and likely represent priming complexes. Most previously described CRL/substrate structures have consisted of monovalent complexes and have involved flexible peptide substrates. The structure of the KCTD5/CUL3NTD/Gβγ complex shows that the oligomerization of a substrate receptor can generate a polyvalent E3 ligase complex and that the internal dynamics of the substrate receptor can position a structured target for ubiquitylation in a CRL3 complex.
Collapse
Affiliation(s)
- Duc Minh Nguyen
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
- Department of Biochemistry, University of Toronto, Toronto, ONM5S 1A8, Canada
| | - Deanna H. Rath
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | - Dominic Devost
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QCH3G 1Y6, Canada
| | - Darlaine Pétrin
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QCH3G 1Y6, Canada
| | - Robert Rizk
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QCH3G 1Y6, Canada
| | - Alan X. Ji
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
- Department of Biochemistry, University of Toronto, Toronto, ONM5S 1A8, Canada
| | - Naveen Narayanan
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | - Darren Yong
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | - Andrew Zhai
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | - Douglas A. Kuntz
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | - Maha U. Q. Mian
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | - Neil C. Pomroy
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
| | | | - Samir Benlekbir
- Molecular Medicine Program, The Hospital for Sick Children, Toronto, ONM5G 0A4, Canada
| | - Mohammad T. Mazhab-Jafari
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ONM5G 2M9, Canada
| | - John L. Rubinstein
- Department of Biochemistry, University of Toronto, Toronto, ONM5S 1A8, Canada
- Molecular Medicine Program, The Hospital for Sick Children, Toronto, ONM5G 0A4, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ONM5G 2M9, Canada
| | - Terence E. Hébert
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QCH3G 1Y6, Canada
| | - Gilbert G. Privé
- Princess Margaret Cancer Centre, University Health Network, Toronto, ONM5G 1L7, Canada
- Department of Biochemistry, University of Toronto, Toronto, ONM5S 1A8, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ONM5G 2M9, Canada
| |
Collapse
|
3
|
Tian T, Li Y, Li J, Zhang G, Wang J, Wan C, Fang J, Wu D, Zhou Y, Qin Y, Zhu H, Liu D, Zhu W. Genetic influence on brain volume alterations related to self-reported childhood abuse. Front Neurosci 2022; 16:1019718. [PMID: 36203798 PMCID: PMC9530554 DOI: 10.3389/fnins.2022.1019718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 08/30/2022] [Indexed: 11/13/2022] Open
Abstract
As an important predictor of adulthood psychopathology, self-reported childhood abuse appears heritable and is associated with brain abnormalities. However, the specific genetic mechanisms behind these brain alterations remain largely unknown. This study recruited young adults who reported different degrees of childhood abuse from the community. In order to fully understand the influence of genes on brain changes related to self-reported childhood abuse, various experiments were conducted in this study. Firstly, volume changes of gray matter and white matter related to childhood abuse were investigated by using advanced magnetic resonance imaging techniques. After sequencing the whole exons, we further investigated the relationship between polygenic risk score, brain volume alterations, and childhood abuse score. Furthermore, transcription-neuroimaging association analysis was used to identify risk genes whose expressions were associated with brain volume alterations. The gray matter volumes of left caudate and superior parietal lobule, and white matter volumes of left cerebellum and right temporal lobe-basal ganglia region were significantly correlated with the childhood abuse score. More importantly, brain volume changes mediated the influence of polygenic risk on self-reported childhood abuse. Additionally, transcription-neuroimaging association analysis reported 63 risk genes whose expression levels were significantly associated with childhood abuse-related brain volume changes. These genes are involved in multiple biological processes, such as nerve development, synaptic transmission, and cell construction. Combining data from multiple perspectives, our work provides evidence of brain abnormalities associated with childhood abuse, and further indicates that polygene genetic risk and risk gene expression may affect the occurrence of childhood abuse by brain regulation, which provides insights into the molecularpathology and neuromechanism of childhood adversity. Paying attention to the physical and mental health of high-risk children may be a fundamental way to prevent childhood abuse and promote lifelong mental health.
Collapse
|
4
|
A proteomic approach identifies isoform-specific and nucleotide-dependent RAS interactions. Mol Cell Proteomics 2022; 21:100268. [PMID: 35839996 PMCID: PMC9396065 DOI: 10.1016/j.mcpro.2022.100268] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 06/28/2022] [Accepted: 07/07/2022] [Indexed: 11/22/2022] Open
Abstract
Active mutations in the RAS genes are found in ∼30% of human cancers. Although thought to have overlapping functions, RAS isoforms show preferential activation in human tumors, which prompted us to employ a comparative and quantitative proteomics approach to generate isoform-specific and nucleotide-dependent interactomes of the four RAS isoforms, KRAS4A, KRAS4B, HRAS, and NRAS. Many isoform-specific interacting proteins were identified, including HRAS-specific CARM1 and CHK1 and KRAS-specific PIP4K2C and IPO7. Comparing the interactomes of WT and constitutively active G12D mutant of RAS isoforms, we identified several potential previously unknown effector proteins of RAS, one of which was recently reported while this article was in preparation, RADIL. These interacting proteins play important roles as knockdown or pharmacological inhibition leads to potent inhibition of cancer cells. The HRAS-specific interacting protein CARM1 plays a role in HRAS-induced senescence, with CARM1 knockdown or inhibition selectively increasing senescence in HRAS-transformed cells but not in KRAS4B-transformed cells. By revealing new isoform-specific and nucleotide-dependent RAS interactors, the study here provides insights to help understand the overlapping functions of the RAS isoforms. RAS interactome uncovers isoform-specific and nucleotide-dependent interactors. Potential novel RAS effector proteins are introduced. RAS interactors are possible new targets for RAS-driven cancer cells.
Collapse
|
5
|
Wei J, Xia S, Sun A, Qu Y, Gao J, Shao G, Yang W, Lin Q. Geranylgeranylation signaling promotes breast cancer cell mitosis via the YAP-activated transcription of kinetochore/centromere genes. Am J Cancer Res 2022; 12:1143-1155. [PMID: 35411228 PMCID: PMC8984885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 02/15/2022] [Indexed: 06/14/2023] Open
Abstract
Geranylgeranylation signaling plays an important role in cancer cell proliferation. Our previous studies have shown that the YAP is one of the geranylgeranylation signal transducers in breast cancer cells (Mi W, et al., Oncogene. 2015; 34(24): 3095-3106). However, the downstream effectors that mediate the promoting effect of the geranylgeranylation/YAP signal axis on breast cancer cell proliferation remain elusive. In this report, we investigated the pathway that mediates the effect of the geranylgeranylation on breast cancer cell proliferation. The results have shown that inhibition of geranylgeranyl biosynthesis inactivates transcription of a set of kinetochore/centromere genes. Further biochemical and cell biological studies demonstrated that inhibition of geranylgeranyl biosynthesis significantly reduced the level of key kinetochore/centromere proteins, thus caused a defect in mitosis. Knockdown of YAP caused similar inhibitory effects on the kinetochore/centromere gene expression and mitosis to that of inhibition of geranylgeranyl biosynthesis. Furthermore, we found that E2F1, the gene coding for E2F1 that is known to activate expression of cell cycle genes, is a target gene of YAP. Knockdown of E2F1 also reduced expression of the kinetochore/centromere genes, suggesting that the activation effect of YAP on expression of the kinetochore/centromere genes may be mediated by E2F1. Our studies have proposed a novel geranylgeranylation-dependent cancer cell proliferation signaling pathway in which geranylgeranylation signaling promotes cancer cell mitosis via the YAP-activated transcription of kinetochore/centromere genes.
Collapse
Affiliation(s)
- Jing Wei
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Song Xia
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Aiqin Sun
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Yaping Qu
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Jinyi Gao
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Genbao Shao
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Wannian Yang
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Qiong Lin
- School of Medicine, Jiangsu University 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| |
Collapse
|
6
|
Chandan NR, Abraham S, SenGupta S, Parent CA, Smrcka AV. A network of Gα i signaling partners is revealed by proximity labeling proteomics analysis and includes PDZ-RhoGEF. Sci Signal 2022; 15:eabi9869. [PMID: 35041463 DOI: 10.1126/scisignal.abi9869] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
G protein-coupled receptors (GPCRs) that couple to the Gαi family of G proteins are key regulators of cell and tissue physiology. Our previous work has revealed new roles for Gαi in regulating the migration of neutrophils and fibrosarcoma cells downstream of activated chemoattractant receptors. Here, we used an intact cell proximity-based labeling coupled to tandem mass tag (TMT)-based quantitative proteomics analysis to identify proteins that selectively interacted with the GTP-bound form of Gαi1. Multiple targets were identified and validated with a BioID2-tagged, constitutively active Gαi1 mutant, suggesting a network of interactions for activated GαI proteins in intact cells. We showed that active Gαi1, but not Gαi2, stimulated one candidate protein, PDZ-RhoGEF (PRG), despite more than 85% sequence identity between the G proteins. We also demonstrated in primary human neutrophils that active Gαi likely regulated the polarization of phosphorylated myosin light chain, a process critical for migration, through the activation of PRG. The identification and characterization of new targets directly or indirectly regulated by Gαi will aid in the investigation of the functional roles of Gαi-coupled GPCRs in multiple biological processes.
Collapse
Affiliation(s)
- Naincy R Chandan
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Saji Abraham
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Shuvasree SenGupta
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Carole A Parent
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA.,Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA.,Rogel Cancer Center Michigan Medicine, University of Michigan, Ann Arbor, MI 48109, USA.,Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Alan V Smrcka
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| |
Collapse
|
7
|
Chung YK, Wong YH. Re‐examining the ‘Dissociation Model’ of G protein activation from the perspective of Gβγ signaling. FEBS J 2020; 288:2490-2501. [DOI: 10.1111/febs.15605] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 10/14/2020] [Accepted: 10/19/2020] [Indexed: 12/27/2022]
Affiliation(s)
- Yin Kwan Chung
- Division of Life Science and Biotechnology Research Institute Hong Kong University of Science and Technology Hong Kong China
| | - Yung Hou Wong
- Division of Life Science and Biotechnology Research Institute Hong Kong University of Science and Technology Hong Kong China
- State Key Laboratory of Molecular Neuroscience the Molecular Neuroscience Center Hong Kong University of Science and Technology Kowloon China
| |
Collapse
|
8
|
Valgardson J, Cosbey R, Houser P, Rupp M, Van Bronkhorst R, Lee M, Jagodzinski F, Amacher JF. MotifAnalyzer-PDZ: A computational program to investigate the evolution of PDZ-binding target specificity. Protein Sci 2019; 28:2127-2143. [PMID: 31599029 DOI: 10.1002/pro.3741] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/27/2019] [Accepted: 09/30/2019] [Indexed: 12/15/2022]
Abstract
Recognition of short linear motifs (SLiMs) or peptides by proteins is an important component of many cellular processes. However, due to limited and degenerate binding motifs, prediction of cellular targets is challenging. In addition, many of these interactions are transient and of relatively low affinity. Here, we focus on one of the largest families of SLiM-binding domains in the human proteome, the PDZ domain. These domains bind the extreme C-terminus of target proteins, and are involved in many signaling and trafficking pathways. To predict endogenous targets of PDZ domains, we developed MotifAnalyzer-PDZ, a program that filters and compares all motif-satisfying sequences in any publicly available proteome. This approach enables us to determine possible PDZ binding targets in humans and other organisms. Using this program, we predicted and biochemically tested novel human PDZ targets by looking for strong sequence conservation in evolution. We also identified three C-terminal sequences in choanoflagellates that bind a choanoflagellate PDZ domain, the Monsiga brevicollis SHANK1 PDZ domain (mbSHANK1), with endogenously-relevant affinities, despite a lack of conservation with the targets of a homologous human PDZ domain, SHANK1. All three are predicted to be signaling proteins, with strong sequence homology to cytosolic and receptor tyrosine kinases. Finally, we analyzed and compared the positional amino acid enrichments in PDZ motif-satisfying sequences from over a dozen organisms. Overall, MotifAnalyzer-PDZ is a versatile program to investigate potential PDZ interactions. This proof-of-concept work is poised to enable similar types of analyses for other SLiM-binding domains (e.g., MotifAnalyzer-Kinase). MotifAnalyzer-PDZ is available at http://motifAnalyzerPDZ.cs.wwu.edu.
Collapse
Affiliation(s)
- Jordan Valgardson
- Department of Computer Science, Western Washington University, Bellingham, Washington.,Department of Chemistry, Western Washington University, Bellingham, Washington
| | - Robin Cosbey
- Department of Computer Science, Western Washington University, Bellingham, Washington
| | - Paul Houser
- Department of Computer Science, Western Washington University, Bellingham, Washington
| | - Milo Rupp
- Department of Computer Science, Western Washington University, Bellingham, Washington
| | - Raiden Van Bronkhorst
- Department of Computer Science, Western Washington University, Bellingham, Washington
| | - Michael Lee
- Department of Computer Science, Western Washington University, Bellingham, Washington
| | - Filip Jagodzinski
- Department of Computer Science, Western Washington University, Bellingham, Washington
| | - Jeanine F Amacher
- Department of Chemistry, Western Washington University, Bellingham, Washington
| |
Collapse
|
9
|
Smrcka AV, Fisher I. G-protein βγ subunits as multi-functional scaffolds and transducers in G-protein-coupled receptor signaling. Cell Mol Life Sci 2019; 76:4447-4459. [PMID: 31435698 PMCID: PMC6842434 DOI: 10.1007/s00018-019-03275-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 08/05/2019] [Accepted: 08/12/2019] [Indexed: 02/08/2023]
Abstract
G-protein βγ subunits are key participants in G-protein signaling. These subunits facilitate interactions between receptors and G proteins that are critical for the G protein activation cycle at the plasma membrane. In addition, they play roles in directly transducing signals to an ever expanding range of downstream targets, including integral membrane and cytosolic proteins. Emerging data indicate that Gβγ may play additional roles at intracellular compartments including endosomes, the Golgi apparatus, and the nucleus. Here, we discuss the molecular and structural basis for their ability to coordinate this wide range of cellular activities.
Collapse
Affiliation(s)
- Alan V Smrcka
- Department of Pharmacology, University of Michigan Medical School, Ann Arbor, MI, 48104, USA.
| | - Isaac Fisher
- Department of Pharmacology, University of Michigan Medical School, Ann Arbor, MI, 48104, USA
- Department of Pharmacology and Physiology, University of Rochester School of Medicine, Rochester, NY, 14629, USA
| |
Collapse
|
10
|
Fu Q, Yang F, Liao M, Feeney NJ, Deng K, Serifis N, Wei L, Yang H, Chen K, Deng S, Markmann JF. Rap GTPase Interactor: A Potential Marker for Cancer Prognosis Following Kidney Transplantation. Front Oncol 2019; 9:737. [PMID: 31448237 PMCID: PMC6692533 DOI: 10.3389/fonc.2019.00737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Accepted: 07/23/2019] [Indexed: 11/17/2022] Open
Abstract
Post-transplant (post-Tx) kidney cancer has become the second-highest cause of death in kidney recipients. Late diagnosis and treatment are the main reasons for high mortality. Further research into early diagnosis and potential treatment is therefore required. In this current study, through genome-wide RNA-Seq profile analysis of post-Tx malignant blood samples and post-Tx non-malignant control blood samples (CTRL-Tx), we found Rap GTPase Interactor (RADIL) and Aprataxin (APTX) to be the most meaningful markers for cancer diagnosis. Receiver operating characteristic (ROC) curve analysis showed that the area under the curve (AUC) of the RADIL-APTX signature model was 0.92 (P < 0.0001). Similarly, the AUC of RADIL alone was 0.91 (P < 0.0001) and that of APTX was 0.81 (P = 0.001). Additionally, using a semi-supervised method, we found that RADIL alone could better predict malignancies in kidney transplantation recipients than APTX alone. Kaplan-Meier analysis indicated that RADIL was expressed significantly higher in the early stages (I and II) of kidney, liver, stomach, and pancreatic cancer, suggesting the potential use of RADIL in early diagnosis. Multivariable Cox regression analysis found that RADIL together with other factors (including age, stage III, stage IV and CD8+ T cells) play a key role in kidney cancer development. Among those factors, RADIL could promote kidney cancer development (HR > 1, P < 0.05) while CD8+ T cells could inhibit kidney cancer development (HR < 1, P < 0.05). RADIL may be a new immunotherapy target for kidney cancer post kidney transplantation.
Collapse
Affiliation(s)
- Qiang Fu
- Organ Transplantation Center, Sichuan Provincial People's Hospital and School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.,Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States.,Organ Transplantation Translational Medicine Key Laboratory of Sichuan Province, Chengdu, China
| | - Fan Yang
- Women and Children Health Care Center of Luoyang, Luoyang, China
| | - Minxue Liao
- Organ Transplantation Center, Sichuan Provincial People's Hospital and School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.,Organ Transplantation Translational Medicine Key Laboratory of Sichuan Province, Chengdu, China
| | - Noel J Feeney
- Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Kevin Deng
- Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Nikolaos Serifis
- Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Liang Wei
- Organ Transplantation Center, Sichuan Provincial People's Hospital and School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.,Organ Transplantation Translational Medicine Key Laboratory of Sichuan Province, Chengdu, China
| | - Hongji Yang
- Organ Transplantation Center, Sichuan Provincial People's Hospital and School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.,Organ Transplantation Translational Medicine Key Laboratory of Sichuan Province, Chengdu, China
| | - Kai Chen
- Organ Transplantation Center, Sichuan Provincial People's Hospital and School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.,Organ Transplantation Translational Medicine Key Laboratory of Sichuan Province, Chengdu, China
| | - Shaoping Deng
- Organ Transplantation Center, Sichuan Provincial People's Hospital and School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.,Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States.,Organ Transplantation Translational Medicine Key Laboratory of Sichuan Province, Chengdu, China
| | - James F Markmann
- Division of Transplantation, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| |
Collapse
|
11
|
To JY, Smrcka AV. Activated heterotrimeric G protein α i subunits inhibit Rap-dependent cell adhesion and promote cell migration. J Biol Chem 2017; 293:1570-1578. [PMID: 29259127 DOI: 10.1074/jbc.ra117.000964] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 12/05/2017] [Indexed: 11/06/2022] Open
Abstract
Our recent work uncovered novel roles for activated Gαi signaling in the regulation of neutrophil polarity and adhesion. GαiGTP-mediated enhancement of neutrophil polarization was dependent on inhibition of cAMP/PKA signaling, whereas reversal of Gβγ-stimulated adhesion was cAMP/PKA independent. To uncover the mechanism for Gαi regulation of adhesion, we analyzed the effects of constitutively active Gαi1(Q204L) expression on adhesion driven by constitutively active Rap1a(G12V) or its downstream effector Radil in neutrophil-like HL-60 cells, or in HT-1080 fibrosarcoma cells. In HT-1080 cells, Rap1a(G12V) or Radil cause an increase in cell spreading and adhesion to fibronectin, which are both reversed by Gαi1(Q204L) but not WT Gαi1 In contrast, Gαi1(Q204L) did not reverse Rap1-GTP-interacting adaptor molecule (RIAM)-dependent increases in cell adhesion. This indicates that adhesion regulation by Gαi-GTP occurs downstream of Rap1a and Radil, but is upstream of components such as integrins and talin that are regulated by both Radil and RIAM. HL-60 neutrophil-like cells expressing Rap1a(G12V) or Radil have an elongated phenotype because of enhanced uropod adhesion as they attempt to migrate on fibronectin. This elongated phenotype driven by Rap1a(G12V) or Radil is reversed by Gαi1(Q204L), but not by WT Gαi1 expression, suggesting that Gαi-GTP also regulates adhesion in immune cells at the level of, or downstream of, Radil. These data identify a novel role of Gαi-GTP in regulation of cell adhesion and migration. Cell migration involves cycles of adhesion and de-adhesion, and we propose that the dynamic spatiotemporal balance between Gβγ-promoted adhesion and Gαi-GTP reversal of adhesion is important for this process.
Collapse
Affiliation(s)
- Jesi Y To
- From the Department of Pharmacology and Physiology, University of Rochester School of Medicine, Rochester, New York, 14623 and
| | - Alan V Smrcka
- From the Department of Pharmacology and Physiology, University of Rochester School of Medicine, Rochester, New York, 14623 and .,the Department of Pharmacology, University of Michigan Medical School, Ann Arbor, Michigan 48109
| |
Collapse
|
12
|
Gβγ subunits-Different spaces, different faces. Pharmacol Res 2016; 111:434-441. [PMID: 27378564 DOI: 10.1016/j.phrs.2016.06.026] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 06/27/2016] [Accepted: 06/28/2016] [Indexed: 11/20/2022]
Abstract
Gβγ subunits play key roles in modulation of canonical effectors in G protein-coupled receptor (GPCR)-dependent signalling at the cell surface. However, a number of recent studies of Gβγ function have revealed that they regulate a large number of molecules at distinct subcellular sites. These novel, non-canonical Gβγ roles have reshaped our understanding of how important Gβγ signalling is compared to our original notion of Gβγ subunits as simple negative regulators of Gα subunits. Gβγ dimers have now been identified as regulators of transcription, anterograde and retrograde trafficking and modulators of second messenger molecule generation in intracellular organelles. Here, we review some recent advances in our understanding of these novel non-canonical roles of Gβγ.
Collapse
|
13
|
Di Sebastiano AR, Fahim S, Dunn HA, Walther C, Ribeiro FM, Cregan SP, Angers S, Schmid S, Ferguson SSG. Role of Spinophilin in Group I Metabotropic Glutamate Receptor Endocytosis, Signaling, and Synaptic Plasticity. J Biol Chem 2016; 291:17602-15. [PMID: 27358397 DOI: 10.1074/jbc.m116.722355] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Indexed: 11/06/2022] Open
Abstract
Activation of Group I metabotropic glutamate receptors (mGluRs) activates signaling cascades, resulting in calcium release from intracellular stores, ERK1/2 activation, and long term changes in synaptic activity that are implicated in learning, memory, and neurodegenerative diseases. As such, elucidating the molecular mechanisms underlying Group I mGluR signaling is important for understanding physiological responses initiated by the activation of these receptors. In the current study, we identify the multifunctional scaffolding protein spinophilin as a novel Group I mGluR-interacting protein. We demonstrate that spinophilin interacts with the C-terminal tail and second intracellular loop of Group I mGluRs. Furthermore, we show that interaction of spinophilin with Group I mGluRs attenuates receptor endocytosis and phosphorylation of ERK1/2, an effect that is dependent upon the interaction of spinophilin with the C-terminal PDZ binding motif encoded by Group I mGluRs. Spinophilin knock-out results in enhanced mGluR5 endocytosis as well as increased ERK1/2, AKT, and Ca(2+) signaling in primary cortical neurons. In addition, the loss of spinophilin expression results in impaired mGluR5-stimulated LTD. Our results indicate that spinophilin plays an important role in regulating the activity of Group I mGluRs as well as their influence on synaptic activity.
Collapse
Affiliation(s)
- Andrea R Di Sebastiano
- From the J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, London, Ontario N6A 3K7, Canada
| | - Sandra Fahim
- From the J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, London, Ontario N6A 3K7, Canada
| | - Henry A Dunn
- the Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario K1H 8M5, Canada
| | - Cornelia Walther
- From the J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, London, Ontario N6A 3K7, Canada
| | - Fabiola M Ribeiro
- the Departamento de Bioquimica e Imunologia, ICB, Universidade Federa de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Sean P Cregan
- From the J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, London, Ontario N6A 3K7, Canada
| | - Stephane Angers
- the Leslie Dan Faculty of Pharmacy and Department of Pharmacology, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | - Susanne Schmid
- the Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario N6A 3K7, Canada, and
| | - Stephen S G Ferguson
- the Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario N6A 3K7, Canada, and
| |
Collapse
|
14
|
Lin Q, Yang W. The Hippo-YAP/TAZ pathway mediates geranylgeranylation signaling in breast cancer progression. Mol Cell Oncol 2016; 3:e969638. [PMID: 27314103 DOI: 10.4161/23723548.2014.969638] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 08/28/2014] [Accepted: 08/28/2014] [Indexed: 12/14/2022]
Abstract
Protein geranylgeranylation (GGylation) regulates the function of various signal transducers including small GTPases and Ggamma subunits. The role of GGylation in breast cancer progression is poorly understood. Recent studies suggest that GGylation promotes the proliferation and migration of breast carcinoma cells through the Hippo-YAP/TAZ pathway.
Collapse
Affiliation(s)
- Qiong Lin
- School of Medical Sciences & Laboratory Medicine, Jiangsu University, Zhenjiang, China; Weis Center for Research, Geisinger Clinic, Danville, PA, USA
| | - Wannian Yang
- Weis Center for Research, Geisinger Clinic , Danville, PA, USA
| |
Collapse
|
15
|
Lagarrigue F, Vikas Anekal P, Lee HS, Bachir AI, Ablack JN, Horwitz AF, Ginsberg MH. A RIAM/lamellipodin-talin-integrin complex forms the tip of sticky fingers that guide cell migration. Nat Commun 2015; 6:8492. [PMID: 26419705 PMCID: PMC4589889 DOI: 10.1038/ncomms9492] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 08/26/2015] [Indexed: 01/10/2023] Open
Abstract
The leading edge of migrating cells contains rapidly translocating activated integrins associated with growing actin filaments that form 'sticky fingers' to sense extracellular matrix and guide cell migration. Here we utilized indirect bimolecular fluorescence complementation to visualize a molecular complex containing a Mig-10/RIAM/lamellipodin (MRL) protein (Rap1-GTP-interacting adaptor molecule (RIAM) or lamellipodin), talin and activated integrins in living cells. This complex localizes at the tips of growing actin filaments in lamellipodial and filopodial protrusions, thus corresponding to the tips of the 'sticky fingers.' Formation of the complex requires talin to form a bridge between the MRL protein and the integrins. Moreover, disruption of the MRL protein-integrin-talin (MIT) complex markedly impairs cell protrusion. These data reveal the molecular basis of the formation of 'sticky fingers' at the leading edge of migrating cells and show that an MIT complex drives these protrusions.
Collapse
Affiliation(s)
- Frederic Lagarrigue
- Department of Medicine, University of California San Diego, La Jolla, California 92093, USA
| | - Praju Vikas Anekal
- Department of Medicine, University of California San Diego, La Jolla, California 92093, USA
| | - Ho-Sup Lee
- Department of Medicine, University of California San Diego, La Jolla, California 92093, USA
| | - Alexia I Bachir
- Department of Cell Biology, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Jailal N Ablack
- Department of Medicine, University of California San Diego, La Jolla, California 92093, USA
| | - Alan F Horwitz
- Department of Cell Biology, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Mark H Ginsberg
- Department of Medicine, University of California San Diego, La Jolla, California 92093, USA
| |
Collapse
|
16
|
Rap1 Spatially Controls ArhGAP29 To Inhibit Rho Signaling during Endothelial Barrier Regulation. Mol Cell Biol 2015; 35:2495-502. [PMID: 25963656 DOI: 10.1128/mcb.01453-14] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 05/01/2015] [Indexed: 01/01/2023] Open
Abstract
The small GTPase Rap1 controls the actin cytoskeleton by regulating Rho GTPase signaling. We recently established that the Rap1 effectors Radil and Rasip1, together with the Rho GTPase activating protein ArhGAP29, mediate Rap1-induced inhibition of Rho signaling in the processes of epithelial cell spreading and endothelial barrier function. Here, we show that Rap1 induces the independent translocations of Rasip1 and a Radil-ArhGAP29 complex to the plasma membrane. This results in the formation of a multimeric protein complex required for Rap1-induced inhibition of Rho signaling and increased endothelial barrier function. Together with the previously reported spatiotemporal control of the Rap guanine nucleotide exchange factor Epac1, these findings elucidate a signaling pathway for spatiotemporal control of Rho signaling that operates by successive protein translocations to and complex formation at the plasma membrane.
Collapse
|
17
|
Raka F, Di Sebastiano AR, Kulhawy SC, Ribeiro FM, Godin CM, Caetano FA, Angers S, Ferguson SSG. Ca(2+)/calmodulin-dependent protein kinase II interacts with group I metabotropic glutamate and facilitates receptor endocytosis and ERK1/2 signaling: role of β-amyloid. Mol Brain 2015; 8:21. [PMID: 25885040 PMCID: PMC4378271 DOI: 10.1186/s13041-015-0111-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 03/12/2015] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Agonist stimulation of Group I metabotropic glutamate receptors (mGluRs) initiates their coupling to the heterotrimeric G protein, Gαq/11, resulting in the activation of phospholipase C, the release of Ca(2+) from intracellular stores and the subsequent activation of protein kinase C. However, it is now recognized that mGluR5a also functions as a receptor for cellular prion protein (PrP(C)) and β-amyloid peptide (Aβ42) oligomers to facilitate intracellular signaling via the resulting protein complex. Intracellular mGluR5a signaling is also regulated by its association with a wide variety of intracellular regulation proteins. RESULTS In the present study, we utilized mass spectroscopy to identify calmodulin kinase IIα (CaMKIIα) as a protein that interacts with the second intracellular loop domain of mGluR5. We show that CaMKIIα interacts with both mGluR1a and mGluR5a in an agonist-independent manner and is co-immunoprecipitated with mGluR5a from hippocampal mouse brain. CaMKIIα positively regulates both mGluR1a and mGluR5a endocytosis, but selectively attenuates mGluR5a but not mGluR1a-stimulated ERK1/2 phosphorylation in a kinase activity-dependent manner. We also find that Aβ42 oligomers stimulate the association of CaMKIIα with mGluR5a and activate ERK1/2 in an mGluR5a-dependent manner. However, Aβ42 oligomer-stimulated ERK1/2 phosphorylation is not regulated by mGluR5a/CaMKIIα interactions suggesting that agonist and Aβ42 oligomers stabilize distinct mGluR5a activation states that are differentially regulated by CaMKIIα. The expression of both mGluR5a and PrP(C) together, but not alone resulted in the agonist-stimulated subcellular distribution of CaMKIIα into cytoplasmic puncta. CONCLUSIONS Taken together these results indicate that CaMKIIα selectively regulates mGluR1a and mGluR5a ERK1/2 signaling. As mGluR5 and CaMKIIα are involved in learning and memory and Aβ and mGluR5 are implicated in Alzheimer's disease, results of these studies could provide insight into potential pharmacological targets for treatment of Alzheimer's disease.
Collapse
Affiliation(s)
- Fitore Raka
- J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, and the Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Dr. London, Ontario, N6A 5K8, Canada.
| | - Andrea R Di Sebastiano
- J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, and the Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Dr. London, Ontario, N6A 5K8, Canada.
| | - Stephanie C Kulhawy
- J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, and the Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Dr. London, Ontario, N6A 5K8, Canada.
| | - Fabiola M Ribeiro
- Departamento de Bioquimica e Imunologia, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil.
| | - Christina M Godin
- J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, and the Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Dr. London, Ontario, N6A 5K8, Canada.
| | - Fabiana A Caetano
- J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, and the Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Dr. London, Ontario, N6A 5K8, Canada.
| | - Stephane Angers
- Leslie Dan Faculty of Pharmacy, University of Toronto, Room 901 144 College Street, Toronto, Ontario, Canada.
| | - Stephen S G Ferguson
- J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, and the Department of Physiology and Pharmacology, University of Western Ontario, 100 Perth Dr. London, Ontario, N6A 5K8, Canada.
| |
Collapse
|
18
|
Tandem affinity purification to identify cytosolic and nuclear gβγ-interacting proteins. Methods Mol Biol 2015; 1234:161-84. [PMID: 25304356 DOI: 10.1007/978-1-4939-1755-6_14] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
It has become clear in recent years that the Gβγ subunits of heterotrimeric proteins serve broad roles in the regulation of cellular activity and interact with many proteins in different subcellular locations including the nucleus. Protein affinity purification is a common method to identify and confirm protein interactions. When used in conjugation with mass spectrometry it can be used to identify novel protein interactions with a given bait protein. The tandem affinity purification (TAP) technique identifies partner proteins bound to tagged protein bait. Combined with protocols to enrich the nuclear fraction of whole cell lysate through sucrose cushions, TAP allows for purification of interacting proteins found specifically in the nucleus. Here we describe the use of the TAP technique on cytosolic and nuclear lysates to identify candidate proteins, through mass spectrometry, that bind to Gβ1 subunits.
Collapse
|
19
|
Mi W, Lin Q, Childress C, Sudol M, Robishaw J, Berlot CH, Shabahang M, Yang W. Geranylgeranylation signals to the Hippo pathway for breast cancer cell proliferation and migration. Oncogene 2014; 34:3095-106. [PMID: 25109332 DOI: 10.1038/onc.2014.251] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 06/09/2014] [Accepted: 06/15/2014] [Indexed: 12/17/2022]
Abstract
Protein geranylgeranylation (GGylation) is an important biochemical process for many cellular signaling molecules. Previous studies have shown that GGylation is essential for cell survival in many types of cancer. However, the molecular mechanism mediating the cell survival effect remains elusive. In this report, we show that the Hippo pathway mediates GGylation-dependent cell proliferation and migration in breast cancer cells. Blockade of GGylation enhanced phosphorylation of Mst1/2 and Lats1, and inhibited YAP and TAZ activity and the Hippo-YAP/TAZ pathway-dependent transcription. The effect of GGylation blockade on inhibition of breast cancer cell proliferation and migration is dependent on the Hippo-YAP/TAZ signaling, in which YAP appears to regulate cell proliferation and TAZ to regulate cell migration. Furthermore, GGylation-dependent cell proliferation is correlated with the activity of YAP/TAZ in breast cancer cells. Finally, Gγ and RhoA are the GGylated proteins that may transduce GGylation signals to the Hippo-YAP/TAZ pathway. Taken together, our studies have demonstrated that the Hippo-YAP/TAZ pathway is essential for GGylation-dependent cancer cell proliferation and migration.
Collapse
Affiliation(s)
- W Mi
- Weis Center for Research, Danville, PA, USA
| | - Q Lin
- 1] Weis Center for Research, Danville, PA, USA [2] School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, China
| | | | - M Sudol
- 1] Weis Center for Research, Danville, PA, USA [2] Department of Medicine, Mount Sinai Medical School, New York, NY, USA
| | - J Robishaw
- Weis Center for Research, Danville, PA, USA
| | - C H Berlot
- Weis Center for Research, Danville, PA, USA
| | - M Shabahang
- Department of General Surgery, Geisinger Clinic, Danville, PA, USA
| | - W Yang
- Weis Center for Research, Danville, PA, USA
| |
Collapse
|
20
|
Kurki MI, Gaál EI, Kettunen J, Lappalainen T, Menelaou A, Anttila V, van 't Hof FNG, von und zu Fraunberg M, Helisalmi S, Hiltunen M, Lehto H, Laakso A, Kivisaari R, Koivisto T, Ronkainen A, Rinne J, Kiemeney LAL, Vermeulen SH, Kaunisto MA, Eriksson JG, Aromaa A, Perola M, Lehtimäki T, Raitakari OT, Salomaa V, Gunel M, Dermitzakis ET, Ruigrok YM, Rinkel GJE, Niemelä M, Hernesniemi J, Ripatti S, de Bakker PIW, Palotie A, Jääskeläinen JE. High risk population isolate reveals low frequency variants predisposing to intracranial aneurysms. PLoS Genet 2014; 10:e1004134. [PMID: 24497844 PMCID: PMC3907358 DOI: 10.1371/journal.pgen.1004134] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 12/10/2013] [Indexed: 11/18/2022] Open
Abstract
3% of the population develops saccular intracranial aneurysms (sIAs), a complex trait, with a sporadic and a familial form. Subarachnoid hemorrhage from sIA (sIA-SAH) is a devastating form of stroke. Certain rare genetic variants are enriched in the Finns, a population isolate with a small founder population and bottleneck events. As the sIA-SAH incidence in Finland is >2× increased, such variants may associate with sIA in the Finnish population. We tested 9.4 million variants for association in 760 Finnish sIA patients (enriched for familial sIA), and in 2,513 matched controls with case-control status and with the number of sIAs. The most promising loci (p<5E-6) were replicated in 858 Finnish sIA patients and 4,048 controls. The frequencies and effect sizes of the replicated variants were compared to a continental European population using 717 Dutch cases and 3,004 controls. We discovered four new high-risk loci with low frequency lead variants. Three were associated with the case-control status: 2q23.3 (MAF 2.1%, OR 1.89, p 1.42×10-9); 5q31.3 (MAF 2.7%, OR 1.66, p 3.17×10-8); 6q24.2 (MAF 2.6%, OR 1.87, p 1.87×10-11) and one with the number of sIAs: 7p22.1 (MAF 3.3%, RR 1.59, p 6.08×-9). Two of the associations (5q31.3, 6q24.2) replicated in the Dutch sample. The 7p22.1 locus was strongly differentiated; the lead variant was more frequent in Finland (4.6%) than in the Netherlands (0.3%). Additionally, we replicated a previously inconclusive locus on 2q33.1 in all samples tested (OR 1.27, p 1.87×10-12). The five loci explain 2.1% of the sIA heritability in Finland, and may relate to, but not explain, the increased incidence of sIA-SAH in Finland. This study illustrates the utility of population isolates, familial enrichment, dense genotype imputation and alternate phenotyping in search for variants associated with complex diseases.
Collapse
Affiliation(s)
- Mitja I. Kurki
- Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
- Neurosurgery, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
- * E-mail:
| | - Emília Ilona Gaál
- Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
| | - Johannes Kettunen
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
| | - Tuuli Lappalainen
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Androniki Menelaou
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Verneri Anttila
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
- Analytical and Translational Genetics Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute of Harvard and MIT, Cambridge, Massachusetts, United States of America
| | - Femke N. G. van 't Hof
- UMC Utrecht Stroke Center, Department of Neurology and Neurosurgery, Rudolf Magnus Institute of Neuroscience, University Medical Center Utrecht, The Netherlands
| | - Mikael von und zu Fraunberg
- Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
- Neurosurgery, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
| | - Seppo Helisalmi
- Neurology, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
| | - Mikko Hiltunen
- Neurology, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
| | - Hanna Lehto
- Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
| | - Aki Laakso
- Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
| | - Riku Kivisaari
- Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
| | - Timo Koivisto
- Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
| | - Antti Ronkainen
- Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
| | - Jaakko Rinne
- Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
| | - Lambertus A. L. Kiemeney
- Department of Urology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- Department for Health Evidence, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Sita H. Vermeulen
- Department for Health Evidence, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Mari A. Kaunisto
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
- Folkhälsan Research Centre, Helsinki, Finland
| | - Johan G. Eriksson
- Folkhälsan Research Centre, Helsinki, Finland
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
- Department of General Practice and Primary Health Care, University of Helsinki, Helsinki, Finland
- Department of Internal Medicine, Vasa Central Hospital, Vasa, Finland
- Unit of General Practice, Helsinki University Central Hospital, Helsinki, Finland
| | - Arpo Aromaa
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
| | - Markus Perola
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
- Estonian Genome Center, University of Tartu, Tartu, Estonia
| | - Terho Lehtimäki
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere University Hospital and University of Tampere, Tampere, Finland
| | - Olli T. Raitakari
- Department of Clinical Physiology and Nuclear Medicine, University of Turku and Turku University Hospital, Turku, Finland
- Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku and Turku University Central Hospital, Turku, Finland
| | - Veikko Salomaa
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
| | - Murat Gunel
- Department of Neurosurgery, Department of Neurobiology and Department of Genetics, Program on Neurogenetics, Howard Hughes Medical Institute, Yale School of Medicine, New Haven, Connecticut, United States of America
| | - Emmanouil T. Dermitzakis
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Ynte M. Ruigrok
- UMC Utrecht Stroke Center, Department of Neurology and Neurosurgery, Rudolf Magnus Institute of Neuroscience, University Medical Center Utrecht, The Netherlands
| | - Gabriel J. E. Rinkel
- UMC Utrecht Stroke Center, Department of Neurology and Neurosurgery, Rudolf Magnus Institute of Neuroscience, University Medical Center Utrecht, The Netherlands
| | - Mika Niemelä
- Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
| | - Juha Hernesniemi
- Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
| | - Samuli Ripatti
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
- Hjelt Institute, University of Helsinki, Helsinki, Finland
| | - Paul I. W. de Bakker
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
- Program in Medical and Population Genetics, Broad Institute of Harvard and MIT, Cambridge, Massachusetts, United States of America
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Epidemiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Aarno Palotie
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
- Analytical and Translational Genetics Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute of Harvard and MIT, Cambridge, Massachusetts, United States of America
- Department of Human Genetics, The Wellcome Trust Sanger Institute, Cambridge, United Kingdom
| | - Juha E. Jääskeläinen
- Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
- Neurosurgery, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
| |
Collapse
|
21
|
Ahmed SM, Angers S. Emerging non-canonical functions for heterotrimeric G proteins in cellular signaling. J Recept Signal Transduct Res 2013; 33:177-83. [PMID: 23721574 DOI: 10.3109/10799893.2013.795972] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Classically heterotrimeric G proteins have been described as the principal signal transducing machinery for G-protein-coupled receptors. Receptor activation catalyzes nucleotide exchange on the Gα protein, enabling Gα-GTP and Gβγ-subunits to engage intracellular effectors to generate various cellular effects such as second messenger production or regulation of ion channel conductivity. Recent genetic and proteomic screens have identified novel heterotrimeric G-protein-interacting proteins and expanded their functional roles. This review highlights some examples of recently identified interacting proteins and summarizes how they functionally connect heterotrimeric G proteins to previously underappreciated cellular roles.
Collapse
Affiliation(s)
- Syed M Ahmed
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, Canada
| | | |
Collapse
|
22
|
Rasip1 mediates Rap1 regulation of Rho in endothelial barrier function through ArhGAP29. Proc Natl Acad Sci U S A 2013; 110:11427-32. [PMID: 23798437 DOI: 10.1073/pnas.1306595110] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Rap1 is a small GTPase regulating cell-cell adhesion, cell-matrix adhesion, and actin rearrangements, all processes dynamically coordinated during cell spreading and endothelial barrier function. Here, we identify the adaptor protein ras-interacting protein 1 (Rasip1) as a Rap1-effector involved in cell spreading and endothelial barrier function. Using Förster resonance energy transfer, we show that Rasip1 interacts with active Rap1 in a cellular context. Rasip1 mediates Rap1-induced cell spreading through its interaction partner Rho GTPase-activating protein 29 (ArhGAP29), a GTPase activating protein for Rho proteins. Accordingly, the Rap1-Rasip1 complex induces cell spreading by inhibiting Rho signaling. The Rasip1-ArhGAP29 pathway also functions in Rap1-mediated regulation of endothelial junctions, which controls endothelial barrier function. In this process, Rasip1 cooperates with its close relative ras-association and dilute domain-containing protein (Radil) to inhibit Rho-mediated stress fiber formation and induces junctional tightening. These results reveal an effector pathway for Rap1 in the modulation of Rho signaling and actin dynamics, through which Rap1 modulates endothelial barrier function.
Collapse
|
23
|
Roy SJ, Glazkova I, Fréchette L, Iorio-Morin C, Binda C, Pétrin D, Trieu P, Robitaille M, Angers S, Hébert TE, Parent JL. Novel, gel-free proteomics approach identifies RNF5 and JAMP as modulators of GPCR stability. Mol Endocrinol 2013; 27:1245-66. [PMID: 23798571 DOI: 10.1210/me.2013-1091] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The maturation and folding of G protein-coupled receptors are governed by mechanisms that remain poorly understood. In an effort to characterize these biological events, we optimized a novel, gel-free proteomic approach to identify partners of the β2-adrenergic receptor (β2AR). In addition to a number of known interacting proteins such as heterotrimeric G protein subunits, this allowed us to identify proteins involved in endoplasmic reticulum (ER) QC of the receptor. Among β2AR-associated proteins is Ring finger protein 5 (RNF5), an E3 ubiquitin ligase anchored to the outer membrane of the ER. Coimmunoprecipitation assays confirmed, in a cellular context, the interaction between RNF5 and the β2AR as well as the prostaglandin D2 receptor (DP). Confocal microscopy revealed that DP colocalized with RNF5 at the ER. Coexpression of RNF5 with either receptor increased levels of their expression, whereas small interfering RNA-mediated knockdown of endogenous RNF5 promoted the opposite. RNF5 did not modulate the ubiquitination state of β2AR or DP. Instead, RNF5 ubiquitinated JNK-associated membrane protein (JAMP), a protein that recruits the proteasome to the ER membrane and that is negatively regulated by RNF5-mediated ubiquitination. JAMP coimmunoprecipitated with both β2AR and DP and decreased total receptor protein levels through proteasomal degradation. Expression of DP, a receptor largely retained in the ER, promoted proteasome recruitment by JAMP. Degradation of both receptors via JAMP was increased when RNF5 was depleted. Our data suggest that RNF5 regulates the turnover of specific G protein-coupled receptors by ubiquitinating JAMP and preventing proteasome recruitment.
Collapse
Affiliation(s)
- Sébastien J Roy
- Service de Rhumatologie Département de Médecine, Université de Sherbrooke, the Institut de Pharmacologie de Sherbrooke, and the Centre de Recherche Clinique Etienne-Lebel, Sherbrooke, Québec J1H 5N4, Canada
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Protogenin prevents premature apoptosis of rostral cephalic neural crest cells by activating the α5β1-integrin. Cell Death Dis 2013; 4:e651. [PMID: 23744351 PMCID: PMC3698544 DOI: 10.1038/cddis.2013.177] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The bones and connective tissues of the murine jaws and skull are partly derived from cephalic neural crest cells (CNCCs). Here, we report that mice deficient of protogenin (Prtg) protein, an immunoglobulin domain-containing receptor expressed in the developing nervous system, have impairments of the palatine and skull. Data from lineage tracing experiments, expression patterns of neural crest cell (NCC) marker genes and detection of apoptotic cells indicate that the malformation of bones in Prtg-deficient mice is due to increased apoptosis of rostral CNCCs (R-CNCCs). Using a yeast two-hybrid screening, we found that Prtg interacts with Radil, a protein previously shown to affect the migration and survival of NCCs in zebrafish with unknown mechanism. Overexpression of Prtg induces translocation of Radil from cytoplasm to cell membrane in cultured AD293 cells. In addition, overexpression of Prtg and Radil activates α5β1-integrins to high-affinity conformational forms, which is further enhanced by the addition of Prtg ligand ERdj3 into cultured cells. Blockage of Radil by RNA interference abolishes the effect of ERdj3 and Prtg on the α5β1-integrin, suggesting that Radil acts downstream of Prtg. Prtg-deficient R-CNCCs display fewer activated α5β1-integrins in embryos, and these cells show reduced migratory ability in in vitro transwell assay. These results suggest that the inside-out activation of the α5β1-integrin mediated by ERdj3/Prtg/Radil signaling is crucial for proper functions of R-CNCCs, and the deficiency of this pathway causes premature apoptosis of a subset of R-CNCCs and malformation of craniofacial structures.
Collapse
|
25
|
Khan SM, Sleno R, Gora S, Zylbergold P, Laverdure JP, Labbé JC, Miller GJ, Hébert TE. The expanding roles of Gβγ subunits in G protein-coupled receptor signaling and drug action. Pharmacol Rev 2013; 65:545-77. [PMID: 23406670 DOI: 10.1124/pr.111.005603] [Citation(s) in RCA: 172] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Gβγ subunits from heterotrimeric G proteins perform a vast array of functions in cells with respect to signaling, often independently as well as in concert with Gα subunits. However, the eponymous term "Gβγ" does not do justice to the fact that 5 Gβ and 12 Gγ isoforms have evolved in mammals to serve much broader roles beyond their canonical roles in cellular signaling. We explore the phylogenetic diversity of Gβγ subunits with a view toward understanding these expanded roles in different cellular organelles. We suggest that the particular content of distinct Gβγ subunits regulates cellular activity, and that the granularity of individual Gβ and Gγ action is only beginning to be understood. Given the therapeutic potential of targeting Gβγ action, this larger view serves as a prelude to more specific development of drugs aimed at individual isoforms.
Collapse
Affiliation(s)
- Shahriar M Khan
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Room 1303, Montréal, Québec H3G 1Y6, Canada
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Chidiac P, Hébert TE. GPCR Retreat 2012: timing is everything. J Recept Signal Transduct Res 2013; 33:129-34. [PMID: 23351073 DOI: 10.3109/10799893.2012.759592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In London, Ontario, the 13th Annual Joint meeting of the Great Lakes GPCR Retreat and the Club des Récepteurs à Sept Domaines Transmembranaires (known simply as the GPCR Retreat) was held on 17-19 October 2012, organized by Steve Ferguson and Peter Chidiac. This meeting gathered together a core group of investigators from Michigan, Ontario and Québec and has steadily increased its attendance in both the eastern (Europe) and western (USA, Canada) directions. This year's buzz naturally centered around the Nobel Prize in Chemistry, which was won the week before by Brian Kobilka and Robert Lefkowitz for their work on receptor structure and function. Michel Bouvier provided a heartfelt tribute to one of the attendees, Marc Caron, a pioneer in the GPCR field, has made many contributions to the work that led to this year's Nobel Prize. The meeting featured interesting sessions on the physiological roles of GPCRs in the nervous system, circadian biology and cancer, dealing at the cellular and molecular level with GPCR, G protein and effector structure and function, regulation and trafficking--with an overall focus on how to move molecular pharmacology in vivo.
Collapse
Affiliation(s)
- Peter Chidiac
- Department of Physiology and Pharmacology, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada.
| | | |
Collapse
|
27
|
Ahmed SM, Thériault BL, Uppalapati M, Chiu CWN, Gallie BL, Sidhu SS, Angers S. KIF14 negatively regulates Rap1a-Radil signaling during breast cancer progression. ACTA ACUST UNITED AC 2012; 199:951-67. [PMID: 23209302 PMCID: PMC3518219 DOI: 10.1083/jcb.201206051] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The kinesin KIF14 associates with the PDZ domain of Radil and negatively regulates Rap1-mediated inside-out integrin activation by tethering Radil on microtubules. The small GTPase Rap1 regulates inside-out integrin activation and thereby influences cell adhesion, migration, and polarity. Several Rap1 effectors have been described to mediate the cellular effects of Rap1 in a context-dependent manner. Radil is emerging as an important Rap effector implicated in cell spreading and migration, but the molecular mechanisms underlying its functions are unclear. We report here that the kinesin KIF14 associates with the PDZ domain of Radil and negatively regulates Rap1-mediated inside-out integrin activation by tethering Radil on microtubules. The depletion of KIF14 led to increased cell spreading, altered focal adhesion dynamics, and inhibition of cell migration and invasion. We also show that Radil is important for breast cancer cell proliferation and for metastasis in mice. Our findings provide evidence that the concurrent up-regulation of Rap1 activity and increased KIF14 levels in several cancers is needed to reach optimal levels of Rap1–Radil signaling, integrin activation, and cell–matrix adhesiveness required for tumor progression.
Collapse
Affiliation(s)
- Syed M Ahmed
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A1, Canada
| | | | | | | | | | | | | |
Collapse
|
28
|
Liu L, Aerbajinai W, Ahmed SM, Rodgers GP, Angers S, Parent CA. Radil controls neutrophil adhesion and motility through β2-integrin activation. Mol Biol Cell 2012; 23:4751-65. [PMID: 23097489 PMCID: PMC3521683 DOI: 10.1091/mbc.e12-05-0408] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Various agonists trigger β2-integrin activation in neutrophils, yet the mechanisms that regulate β2-integrin inside-out signaling remain obscure. Radil, a novel Rap downstream effector, is an important adapter in the pathway that links G protein–coupled chemoattractant receptors to adhesion complexes during neutrophil chemotaxis. Integrin activation is required to facilitate multiple adhesion-dependent functions of neutrophils, such as chemotaxis, which is critical for inflammatory responses to injury and pathogens. However, little is known about the mechanisms that mediate integrin activation in neutrophils. We show that Radil, a novel Rap1 effector, regulates β1- and β2-integrin activation and controls neutrophil chemotaxis. On activation and chemotactic migration of neutrophils, Radil quickly translocates from the cytoplasm to the plasma membrane in a Rap1a-GTP–dependent manner. Cells overexpressing Radil show a substantial increase in cell adhesion, as well as in integrin/focal adhesion kinase (FAK) activation, and exhibit an elongated morphology, with severe tail retraction defects. This phenotype is effectively rescued by treatment with either β2-integrin inhibitory antibodies or FAK inhibitors. Conversely, knockdown of Radil causes severe inhibition of cell adhesion, β2-integrin activation, and chemotaxis. Furthermore, we found that inhibition of Rap activity by RapGAP coexpression inhibits Radil-mediated integrin and FAK activation, decreases cell adhesion, and abrogates the long-tail phenotype of Radil cells. Overall, these studies establish that Radil regulates neutrophil adhesion and motility by linking Rap1 to β2-integrin activation.
Collapse
Affiliation(s)
- Lunhua Liu
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | | | | | | | | | | |
Collapse
|
29
|
Ragain CM, Newberry RW, Ritchie AW, Webb LJ. Role of Electrostatics in Differential Binding of RalGDS to Rap Mutations E30D and K31E Investigated by Vibrational Spectroscopy of Thiocyanate Probes. J Phys Chem B 2012; 116:9326-36. [DOI: 10.1021/jp303272y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Christina M. Ragain
- Department of Chemistry
and Biochemistry, Center for Nano- and Molecular Science
and Technology and Institute
for Cell and Molecular Biology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas
78712, United States
| | - Robert W. Newberry
- Department of Chemistry
and Biochemistry, Center for Nano- and Molecular Science
and Technology and Institute
for Cell and Molecular Biology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas
78712, United States
| | - Andrew W. Ritchie
- Department of Chemistry
and Biochemistry, Center for Nano- and Molecular Science
and Technology and Institute
for Cell and Molecular Biology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas
78712, United States
| | - Lauren J. Webb
- Department of Chemistry
and Biochemistry, Center for Nano- and Molecular Science
and Technology and Institute
for Cell and Molecular Biology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas
78712, United States
| |
Collapse
|
30
|
Wijga S, Bastiaansen JWM, Wall E, Strandberg E, de Haas Y, Giblin L, Bovenhuis H. Genomic associations with somatic cell score in first-lactation Holstein cows. J Dairy Sci 2012; 95:899-908. [PMID: 22281354 DOI: 10.3168/jds.2011-4717] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Accepted: 10/13/2011] [Indexed: 12/12/2022]
Abstract
This genome-wide association study aimed to identify loci associated with lactation-average somatic cell score (LASCS) and the standard deviation of test-day somatic cell score (SCS-SD). It is one of the first studies to combine detailed phenotypic and genotypic cow data from research dairy herds located in different countries. The combined data set contained up to 52 individual test-days per lactation and thereby aimed to capture temporary increases in somatic cell score associated with infection. Phenotypic data for analysis consisted of 46,882 test-day records on 1,484 cows, and genotypic data consisted of 37,590 single nucleotide polymorphisms (SNP). Using an animal model, the associations between each individual SNP and the phenotypic data were estimated. To account for the risk of false positives, a false discovery rate threshold of 0.20 was set. The analyses showed that LASCS was significantly associated with a SNP on Bos taurus autosome (BTA) 4 and a SNP on BTA18. Likewise, SCS-SD was associated with this SNP on BTA18. In addition, SCS-SD significantly associated with a SNP on BTA6. Relatively few associations were found, suggesting that LASCS and SCS-SD are controlled by multiple loci distributed across the genome, each with a relatively small effect. Increased knowledge on genetic regulation of LASCS and SCS-SD may aid in identification of genes that play a role in mastitis resistance. Such knowledge helps us understand the genetic mechanisms leading to mastitis and in discovery of targets for mastitis therapeutics.
Collapse
Affiliation(s)
- S Wijga
- Animal Breeding and Genomics Centre, Wageningen University, PO Box 338, 6700 PG, Wageningen, The Netherlands.
| | | | | | | | | | | | | |
Collapse
|
31
|
Niola F, Zhao X, Singh D, Castano A, Sullivan R, Lauria M, Nam HS, Zhuang Y, Benezra R, Di Bernardo D, Iavarone A, Lasorella A. Id proteins synchronize stemness and anchorage to the niche of neural stem cells. Nat Cell Biol 2012; 14:477-87. [PMID: 22522171 DOI: 10.1038/ncb2490] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Accepted: 03/26/2012] [Indexed: 02/08/2023]
Abstract
Stem-cell functions require activation of stem-cell-intrinsic transcriptional programs and extracellular interaction with a niche microenvironment. How the transcriptional machinery controls residency of stem cells in the niche is unknown. Here we show that Id proteins coordinate stem-cell activities with anchorage of neural stem cells (NSCs) to the niche. Conditional inactivation of three Id genes in NSCs triggered detachment of embryonic and postnatal NSCs from the ventricular and vascular niche, respectively. The interrogation of the gene modules directly targeted by Id deletion in NSCs revealed that Id proteins repress bHLH-mediated activation of Rap1GAP, thus serving to maintain the GTPase activity of RAP1, a key mediator of cell adhesion. Preventing the elevation of the Rap1GAP level countered the consequences of Id loss on NSC-niche interaction and stem-cell identity. Thus, by preserving anchorage of NSCs to the extracellular environment, Id activity synchronizes NSC functions to residency in the specialized niche.
Collapse
Affiliation(s)
- Francesco Niola
- Institute for Cancer Genetics, Columbia University Medical Center, New York, New York 10032, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Li RW, Li C, Wang TT. Transcriptomic alterations in human prostate cancer cell LNCaP tumor xenograft modulated by dietary phenethyl isothiocyanate. Mol Carcinog 2012; 52:426-37. [DOI: 10.1002/mc.21873] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 12/15/2011] [Accepted: 12/27/2011] [Indexed: 01/10/2023]
|
33
|
Lee AHY, Hurley B, Felsensteiner C, Yea C, Ckurshumova W, Bartetzko V, Wang PW, Quach V, Lewis JD, Liu YC, Börnke F, Angers S, Wilde A, Guttman DS, Desveaux D. A bacterial acetyltransferase destroys plant microtubule networks and blocks secretion. PLoS Pathog 2012; 8:e1002523. [PMID: 22319451 PMCID: PMC3271077 DOI: 10.1371/journal.ppat.1002523] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 12/21/2011] [Indexed: 02/06/2023] Open
Abstract
The eukaryotic cytoskeleton is essential for structural support and intracellular transport, and is therefore a common target of animal pathogens. However, no phytopathogenic effector has yet been demonstrated to specifically target the plant cytoskeleton. Here we show that the Pseudomonas syringae type III secreted effector HopZ1a interacts with tubulin and polymerized microtubules. We demonstrate that HopZ1a is an acetyltransferase activated by the eukaryotic co-factor phytic acid. Activated HopZ1a acetylates itself and tubulin. The conserved autoacetylation site of the YopJ / HopZ superfamily, K289, plays a critical role in both the avirulence and virulence function of HopZ1a. Furthermore, HopZ1a requires its acetyltransferase activity to cause a dramatic decrease in Arabidopsis thaliana microtubule networks, disrupt the plant secretory pathway and suppress cell wall-mediated defense. Together, this study supports the hypothesis that HopZ1a promotes virulence through cytoskeletal and secretory disruption. Many bacterial pathogens disrupt key components of host physiology by injecting virulence proteins (or “effectors”) via a needle-like structure, called the type III secretion system, directly into eukaryotic cells. The YopJ / HopZ superfamily of type III secreted effector proteins is found in pathogens of both animals and plants providing an excellent opportunity to address how a family of type III secreted effectors can promote pathogenesis in hosts from two kingdoms. YopJ from the animal pathogen Yersinia pestis is an acetyltransferase that targets signaling components of innate immunity and prevents their activation. Here we show that HopZ1a, from the phytopathogen Pseudomonas syringae is an acetyltransferase that binds plant tubulin. Like YopJ, the eukaryotic cofactor phytic acid activates the acetyltransferase activity of HopZ1a. In addition, we demonstrate that activated HopZ1a can acetylate tubulin, a major constituent of the eukaryotic cytoskeleton. In plants, activated HopZ1a causes a dramatic destruction of microtubule networks, inhibits protein secretion, and ultimately suppresses cell wall-mediated defense. Our study emphasizes the functional diversification of this important type III effector family in plant and animal hosts using a conserved acetyltransferase activity.
Collapse
Affiliation(s)
- Amy Huei-Yi Lee
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Centre for the Analysis of Genome Evolution & Function, University of Toronto, Toronto, Ontario, Canada
| | - Brenden Hurley
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Corinna Felsensteiner
- Centre for the Analysis of Genome Evolution & Function, University of Toronto, Toronto, Ontario, Canada
| | - Carmen Yea
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | | | - Verena Bartetzko
- Institut für Biologie, Lehrstuhl für Biochemie, Friedrich Alexander Universität Erlangen-Nürnberg, Germany
| | - Pauline W. Wang
- Centre for the Analysis of Genome Evolution & Function, University of Toronto, Toronto, Ontario, Canada
| | - Van Quach
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Jennifer D. Lewis
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Yulu C. Liu
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Frederik Börnke
- Institut für Biologie, Lehrstuhl für Biochemie, Friedrich Alexander Universität Erlangen-Nürnberg, Germany
| | - Stephane Angers
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Andrew Wilde
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - David S. Guttman
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Centre for the Analysis of Genome Evolution & Function, University of Toronto, Toronto, Ontario, Canada
- * E-mail: (DSG); (DD)
| | - Darrell Desveaux
- Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Centre for the Analysis of Genome Evolution & Function, University of Toronto, Toronto, Ontario, Canada
- * E-mail: (DSG); (DD)
| |
Collapse
|
34
|
Mink1 regulates β-catenin-independent Wnt signaling via Prickle phosphorylation. Mol Cell Biol 2011; 32:173-85. [PMID: 22037766 DOI: 10.1128/mcb.06320-11] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
β-Catenin-independent Wnt signaling pathways have been implicated in the regulation of planar cell polarity (PCP) and convergent extension (CE) cell movements. Prickle, one of the core proteins of these pathways, is known to asymmetrically localize proximally at the adherens junction of Drosophila melanogaster wing cells and to locally accumulate within plasma membrane subdomains in cells undergoing CE movements during vertebrate development. Using mass spectrometry, we have identified the Ste20 kinase Mink1 as a Prickle-associated protein and found that they genetically interact during the establishment of PCP in the Drosophila eye and CE in Xenopus laevis embryos. We show that Mink1 phosphorylates Prickle on a conserved threonine residue and regulates its Rab5-dependent endosomal trafficking, a process required for the localized plasma membrane accumulation and function of Prickle. Mink1 also was found to be important for the clustering of Vangl within plasma membrane puncta. Our results provide a link between Mink and the Vangl-Prickle complex and highlight the importance of Prickle phosphorylation and endosomal trafficking for its function during Wnt-PCP signaling.
Collapse
|
35
|
Piotrowska U, Adler G, Kozicki I. Diverse β subunits of heterotrimeric G proteins are present in thyroid plasma membranes. Biochem Biophys Res Commun 2011; 414:350-4. [PMID: 21964289 DOI: 10.1016/j.bbrc.2011.09.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 09/14/2011] [Indexed: 10/17/2022]
Abstract
The functioning of heterotrimeric G protein α subunits in the transduction of hormonal signals to appropriate intracellular responses is well recognized. Much less is known about the distribution of isoforms and functions of G protein β subunits. Here, using specific antibodies, we documented that in plasma membranes of the thyroid cell line Nthy-ori 3-1 all Gβ isoforms-Gβ(1), Gβ(2), Gβ(3), Gβ(4) and Gβ(5) are present, while the Gβ(3) occurs in minute amount. In plasma membrane fraction isolated from pooled postoperative thyroids of patients with nodular goiter and Graves' disease, the Gβ(1), Gβ(2), Gβ(4) and Gβ(5) subunits were found, whereas Gβ(3) could not be detected. Competition studies revealed that the Gβ(2) is the principal Gβ subunit in membranes from cultured thyroid cells, originated from normal thyroid, as well as in membranes from patients' thyroids. This suggests that Gβ(2) subunit cooperates with Gα(s) subunit, the most active of the Gα variants, during stimulation of adenylate cyclase which constitutes the main route of physiological thyroid stimulation.
Collapse
Affiliation(s)
- Urszula Piotrowska
- Medical Centre of Postgraduate Education, Department of Biochemistry, 01 813 Warsaw, Poland
| | | | | |
Collapse
|
36
|
Tharmalingam S, Daulat AM, Antflick JE, Ahmed SM, Nemeth EF, Angers S, Conigrave AD, Hampson DR. Calcium-sensing receptor modulates cell adhesion and migration via integrins. J Biol Chem 2011; 286:40922-33. [PMID: 21969374 DOI: 10.1074/jbc.m111.265454] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The calcium-sensing receptor (CaSR) is a family C G protein-coupled receptor that is activated by elevated levels of extracellular divalent cations. The CaSR couples to members of the G(q) family of G proteins, and in the endocrine system this receptor is instrumental in regulating the release of parathyroid hormone from the parathyroid gland and calcitonin from thyroid cells. Here, we demonstrate that in medullary thyroid carcinoma cells, the CaSR promotes cellular adhesion and migration via coupling to members of the integrin family of extracellular matrix-binding proteins. Immunopurification and mass spectrometry, co-immunoprecipitation, and co-localization studies showed that the CaSR and β1-containing integrins are components of a macromolecular protein complex. In fibronectin-based cell adhesion and migration assays, the CaSR-positive allosteric modulator NPS R-568 induced a concentration-dependent increase in cell adhesion and migration; both of these effects were blocked by a specific CaSR-negative allosteric modulator. These effects were mediated by integrins because they were blocked by a peptide inhibitor of integrin binding to fibronectin and β1 knockdown experiments. An analysis of intracellular signaling pathways revealed a key role for CaSR-induced phospholipase C activation and the release of intracellular calcium. These results demonstrate for the first time that an ion-sensing G protein-coupled receptor functionally couples to the integrins and, in conjunction with intracellular calcium release, promotes cellular adhesion and migration in tumor cells. The significance of this interaction is further highlighted by studies implicating the CaSR in cancer metastasis, axonal growth, and stem cell attachment, functions that rely on integrin-mediated cell adhesion.
Collapse
Affiliation(s)
- Sujeenthar Tharmalingam
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Lin Y, Smrcka AV. Understanding molecular recognition by G protein βγ subunits on the path to pharmacological targeting. Mol Pharmacol 2011; 80:551-7. [PMID: 21737569 DOI: 10.1124/mol.111.073072] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Heterotrimeric G proteins, composed of Gα and Gβγ subunits, transduce extracellular signals via G-protein-coupled receptors to modulate many important intracellular responses. The Gβγ subunits hold a central position in this signaling system and have been implicated in multiple aspects of physiology and the pathophysiology of disease. The Gβ subunit belongs to a large family of WD40 repeat proteins with a circular β-bladed propeller structure. This structure allows Gβγ to interact with a broad range of proteins to play diverse roles. How Gβγ interacts with and regulates such a wide variety of partners yet maintains specificity is an interesting problem in protein-protein molecular recognition in signal transduction, where signal transfer by proteins is often driven by modular conserved recognition motifs. Evidence has accumulated that one mechanism for Gβγ multitarget recognition is through an intrinsically flexible protein surface or "hot spot" that accommodates multiple modes of binding. Because each target has a unique recognition mode for Gβγ subunits, it suggests that these interactions could be selectively manipulated with small molecules, which could have significant therapeutic potential.
Collapse
Affiliation(s)
- Yuan Lin
- Department of Pharmacology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | | |
Collapse
|
38
|
Ross SH, Post A, Raaijmakers JH, Verlaan I, Gloerich M, Bos JL. Ezrin is required for efficient Rap1-induced cell spreading. J Cell Sci 2011; 124:1808-18. [PMID: 21540295 DOI: 10.1242/jcs.079830] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The Rap family of small GTPases regulate the adhesion of cells to extracellular matrices. Several Rap-binding proteins have been shown to function as effectors that mediate Rap-induced adhesion. However, little is known regarding the relationships between these effectors, or about other proteins that are downstream of or act in parallel to the effectors. To establish whether an array of effectors was required for Rap-induced cell adhesion and spreading, and to find new components involved in Rap-signal transduction, we performed a small-scale siRNA screen in A549 lung epithelial cells. Of the Rap effectors tested, only Radil blocked Rap-induced spreading. Additionally, we identified a novel role for Ezrin downstream of Rap1. Ezrin was necessary for Rap-induced cell spreading, but not Rap-induced cell adhesion or basal adhesion processes. Furthermore, Ezrin depletion inhibited Rap-induced cell spreading in several cell lines, including primary human umbilical vein endothelial cells. Interestingly, Radixin and Moesin, two proteins with high homology to Ezrin, are not required for Rap-induced cell spreading and cannot compensate for loss of Ezrin to rescue Rap-induced cell spreading. Here, we present a novel function for Ezrin in Rap1-induced cell spreading and evidence of a non-redundant role of an ERM family member.
Collapse
Affiliation(s)
- Sarah H Ross
- Molecular Cancer Research, Centre for Biomedical Genetics and Cancer Genomics Centre, University Medical Centre Utrecht, 3584 CG Utrecht, The Netherlands.
| | | | | | | | | | | |
Collapse
|
39
|
Ahmed SM, Daulat AM, Angers S. Tandem affinity purification and identification of heterotrimeric g protein-associated proteins. Methods Mol Biol 2011; 756:357-70. [PMID: 21870239 DOI: 10.1007/978-1-61779-160-4_22] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Heterotrimeric G proteins are the main signal-transducing molecules activated by G protein-coupled receptors. Their GTP-dependent activation leads to the regulation of different effectors such as adenylyl cyclases, phospholipases, and RhoGEFs. To understand the full biological consequences of GPCR signalling and to further understand the cross-talk with other signalling pathways, the complement of proteins associating with heterotrimeric G proteins needs to be identified. Here we describe our mass spectrometry-based proteomic approaches for the study of Gβγ and Gα protein complexes. This approach is predicated on the establishment of mammalian cell lines constitutively or inducibly expressing affinity-tagged versions of Gβγ or wild-type and constitutively active Gα subunits, respectively.
Collapse
Affiliation(s)
- Syed M Ahmed
- Department of Pharmaceutical Sciences & Biochemistry, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, Canada
| | | | | |
Collapse
|