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Marié IJ, Lahiri T, Önder Ö, Elenitoba-Johnson KS, Levy DE. Structural determinants of mitochondrial STAT3 targeting and function. MITOCHONDRIAL COMMUNICATIONS 2024; 2:1-13. [PMID: 38500969 PMCID: PMC10947224 DOI: 10.1016/j.mitoco.2024.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Signal transducer and activator of transcription (STAT) 3 has been found within mitochondria in addition to its canonical role of shuttling between cytoplasm and nucleus during cytokine signaling. Mitochondrial STAT3 has been implicated in modulation of cellular metabolism, largely through effects on the respiratory electron transport chain. However, the structural requirements underlying mitochondrial targeting and function have remained unclear. Here, we show that mitochondrial STAT3 partitions between mitochondrial compartments defined by differential detergent solubility, suggesting that mitochondrial STAT3 is membrane associated. The majority of STAT3 was found in an SDS soluble fraction copurifying with respiratory chain proteins, including numerous components of the complex I NADH dehydrogenase, while a minor component was found with proteins of the mitochondrial translation machinery. Mitochondrial targeting of STAT3 required the amino-terminal domain, and an internal linker domain motif also directed mitochondrial translocation. However, neither the phosphorylation of serine 727 nor the presence of mitochondrial DNA was required for the mitochondrial localization of STAT3. Two cysteine residues in the STAT3 SH2 domain, which have been previously suggested to be targets for protein palmitoylation, were also not required for mitochondrial translocation, but were required for its function as an enhancer of complex I activity. These structural determinants of STAT3 mitochondrial targeting and function provide potential therapeutic targets for disrupting the activity of mitochondrial STAT3 in diseases such as cancer.
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Affiliation(s)
- Isabelle J. Marié
- Department of Pathology and Perlmutter Cancer Center, NYU Grossman School of Medicine, New York, NY, 10128, USA
| | - Tanaya Lahiri
- Department of Pathology and Perlmutter Cancer Center, NYU Grossman School of Medicine, New York, NY, 10128, USA
| | - Özlem Önder
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Kojo S.J. Elenitoba-Johnson
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - David E. Levy
- Department of Pathology and Perlmutter Cancer Center, NYU Grossman School of Medicine, New York, NY, 10128, USA
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2
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Fernando CD, Jayasekara WSN, Inampudi C, Kohonen-Corish MRJ, Cooper WA, Beilharz TH, Josephs TM, Garama DJ, Gough DJ. A STAT3 protein complex required for mitochondrial mRNA stability and cancer. Cell Rep 2023; 42:113033. [PMID: 37703176 DOI: 10.1016/j.celrep.2023.113033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 06/16/2023] [Accepted: 08/10/2023] [Indexed: 09/15/2023] Open
Abstract
Signal transducer and activator of transcription 3 (STAT3) is a potent transcription factor necessary for life whose activity is corrupted in diverse diseases, including cancer. STAT3 biology was presumed to be entirely dependent on its activity as a transcription factor until the discovery of a mitochondrial pool of STAT3, which is necessary for normal tissue function and tumorigenesis. However, the mechanism of this mitochondrial activity remained elusive. This study uses immunoprecipitation and mass spectrometry to identify a complex containing STAT3, leucine-rich pentatricopeptide repeat containing (LRPPRC), and SRA stem-loop-interacting RNA-binding protein (SLIRP) that is required for the stability of mature mitochondrially encoded mRNAs and transport to the mitochondrial ribosome. Moreover, we show that this complex is enriched in patients with lung adenocarcinoma and that its deletion inhibits the growth of lung cancer in vivo, providing therapeutic opportunities through the specific targeting of the mitochondrial activity of STAT3.
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Affiliation(s)
- C Dilanka Fernando
- Department of Molecular Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC 3800, Australia; Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC 3168, Australia
| | - W Samantha N Jayasekara
- Department of Molecular Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC 3800, Australia; Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC 3168, Australia
| | - Chaitanya Inampudi
- Department of Molecular Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC 3800, Australia; Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC 3168, Australia
| | - Maija R J Kohonen-Corish
- Garvan Institute of Medical Research, Darlinghurst, NSW 2010, Australia; Woolcock Institute of Medical Research, Glebe, NSW 2037, Australia; School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; Faculty of Science, UTS Sydney, Ultimo, NSW 2007, Australia
| | - Wendy A Cooper
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; Tissue Pathology and Diagnostic Oncology, NSW Health Pathology, Royal Prince Alfred Hospital, Missenden Road, Camperdown, NSW 2050, Australia; Sydney Medical School, University of Sydney, Camperdown, NSW 2006, Australia
| | - Traude H Beilharz
- Development and Stem Cells Program and the Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Tracy M Josephs
- Drug Discovery Biology Theme, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia; ARC Centre for Cryo-Electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Daniel J Garama
- Department of Molecular Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC 3800, Australia; Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC 3168, Australia.
| | - Daniel J Gough
- Department of Molecular Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, VIC 3800, Australia; Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC 3168, Australia.
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Yuan H, Liu Y, Zhang J, Dong JF, Zhao Z. Transcription factors in megakaryocytes and platelets. Front Immunol 2023; 14:1140501. [PMID: 36969155 PMCID: PMC10034027 DOI: 10.3389/fimmu.2023.1140501] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 03/01/2023] [Indexed: 03/11/2023] Open
Abstract
Transcription factors bind promoter or regulatory sequences of a gene to regulate its rate of transcription. However, they are also detected in anucleated platelets. The transcription factors RUNX1, GATA1, STAT3, NFκB, and PPAR have been widely reported to play key roles in the pathophysiology of platelet hyper-reactivity, thrombosis, and atherosclerosis. These non-transcriptional activities are independent of gene transcription or protein synthesis but their underlying mechanisms of action remain poorly defined. Genetic and acquired defects in these transcription factors are associated with the production of platelet microvesicles that are known to initiate and propagate coagulation and to promote thrombosis. In this review, we summarize recent developments in the study of transcription factors in platelet generation, reactivity, and production of microvesicles, with a focus on non-transcriptional activities of selected transcription factors.
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Affiliation(s)
- Hengjie Yuan
- Tianjin Institute of Neurology, Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
- BloodWorks Research Institute, Seattle, WA, United States
| | - Yafan Liu
- Tianjin Institute of Neurology, Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Jianning Zhang
- Tianjin Institute of Neurology, Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Jing-fei Dong
- BloodWorks Research Institute, Seattle, WA, United States
- Division of Hematology, Department of Medicine, University of Washington, School of Medicine, Seattle, WA, United States
- *Correspondence: Zilong Zhao, ; Jing-fei Dong,
| | - Zilong Zhao
- Tianjin Institute of Neurology, Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
- BloodWorks Research Institute, Seattle, WA, United States
- *Correspondence: Zilong Zhao, ; Jing-fei Dong,
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Li YJ, Zhang C, Martincuks A, Herrmann A, Yu H. STAT proteins in cancer: orchestration of metabolism. Nat Rev Cancer 2023; 23:115-134. [PMID: 36596870 DOI: 10.1038/s41568-022-00537-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/14/2022] [Indexed: 01/04/2023]
Abstract
Reprogrammed metabolism is a hallmark of cancer. However, the metabolic dependency of cancer, from tumour initiation through disease progression and therapy resistance, requires a spectrum of distinct reprogrammed cellular metabolic pathways. These pathways include aerobic glycolysis, oxidative phosphorylation, reactive oxygen species generation, de novo lipid synthesis, fatty acid β-oxidation, amino acid (notably glutamine) metabolism and mitochondrial metabolism. This Review highlights the central roles of signal transducer and activator of transcription (STAT) proteins, notably STAT3, STAT5, STAT6 and STAT1, in orchestrating the highly dynamic metabolism not only of cancer cells but also of immune cells and adipocytes in the tumour microenvironment. STAT proteins are able to shape distinct metabolic processes that regulate tumour progression and therapy resistance by transducing signals from metabolites, cytokines, growth factors and their receptors; defining genetic programmes that regulate a wide range of molecules involved in orchestration of metabolism in cancer and immune cells; and regulating mitochondrial activity at multiple levels, including energy metabolism and lipid-mediated mitochondrial integrity. Given the central role of STAT proteins in regulation of metabolic states, they are potential therapeutic targets for altering metabolic reprogramming in cancer.
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Affiliation(s)
- Yi-Jia Li
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Chunyan Zhang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Antons Martincuks
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Andreas Herrmann
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA, USA
- Sorrento Therapeutics, San Diego, CA, USA
| | - Hua Yu
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA, USA.
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Regulation of mitochondrial morphology and metabolism by Jak-STAT pathway. JOURNAL OF ANIMAL REPRODUCTION AND BIOTECHNOLOGY 2021. [DOI: 10.12750/jarb.36.4.189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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Wang R, Nakshatri H. Systemic Actions of Breast Cancer Facilitate Functional Limitations. Cancers (Basel) 2020; 12:cancers12010194. [PMID: 31941005 PMCID: PMC7016719 DOI: 10.3390/cancers12010194] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/06/2020] [Accepted: 01/09/2020] [Indexed: 12/13/2022] Open
Abstract
Breast cancer is a disease of a specific organ, but its effects are felt throughout the body. The systemic effects of breast cancer can lead to functional limitations in patients who suffer from muscle weakness, fatigue, pain, fibromyalgia, or many other dysfunctions, which hasten cancer-associated death. Mechanistic studies have identified quite a few molecular defects in skeletal muscles that are associated with functional limitations in breast cancer. These include circulating cytokines such as TNF-α, IL-1, IL-6, and TGF-β altering the levels or function of myogenic molecules including PAX7, MyoD, and microRNAs through transcriptional regulators such as NF-κB, STAT3, and SMADs. Molecular defects in breast cancer may also include reduced muscle mitochondrial content and increased extracellular matrix deposition leading to energy imbalance and skeletal muscle fibrosis. This review highlights recent evidence that breast cancer-associated molecular defects mechanistically contribute to functional limitations and further provides insights into therapeutic interventions in managing functional limitations, which in turn may help to improve quality of life in breast cancer patients.
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Affiliation(s)
- Ruizhong Wang
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA;
| | - Harikrishna Nakshatri
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA;
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- VA Roudebush Medical Center, Indianapolis, IN 46202, USA
- Correspondence: ; Tel.: +1-317-278-2238
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Huynh J, Chand A, Gough D, Ernst M. Therapeutically exploiting STAT3 activity in cancer - using tissue repair as a road map. Nat Rev Cancer 2019; 19:82-96. [PMID: 30578415 DOI: 10.1038/s41568-018-0090-8] [Citation(s) in RCA: 313] [Impact Index Per Article: 62.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The tightly orchestrated temporal and spatial control of signal transducer and activator of transcription 3 (STAT3) activity in epithelial, immune and stromal cells is critical for wound healing and tissue repair. Excessive STAT3 activation within cancer cells and cells of the tumour microenvironment can be viewed as a neoplastic mimic of an inflammation-driven repair response that collectively promotes tumour progression. In addition to the canonical transcriptional pathways by which STAT3 promotes stem cell-like characteristics, survival, proliferation, metastatic potential and immune evasion, cytoplasmic STAT3 activity fuels tumour growth by metabolic and other non-transcriptional mechanisms. Here, we review the tumour-modulating activities of STAT3 in light of its role as a signalling node integrating inflammatory responses during wound healing. Accordingly, many of the cytokines that contribute to the para-inflammatory state of most solid malignancies converge on and underpin dysregulated STAT3 activity. Targeting of these cytokines, their cognate receptors and associated signalling cascades in clinical trials is beginning to demonstrate therapeutic efficacy, given that interference with STAT3 activity is likely to simultaneously curb the growth of cancer cells and augment antitumour immunity.
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Affiliation(s)
- Jennifer Huynh
- Olivia Newton-John Cancer Research Institute and La Trobe University School of Cancer Medicine, Heidelberg, Victoria, Australia
| | - Ashwini Chand
- Olivia Newton-John Cancer Research Institute and La Trobe University School of Cancer Medicine, Heidelberg, Victoria, Australia
| | - Daniel Gough
- Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, Victoria, Australia.
- Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.
| | - Matthias Ernst
- Olivia Newton-John Cancer Research Institute and La Trobe University School of Cancer Medicine, Heidelberg, Victoria, Australia.
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Abstract
Signal transducer and activator of transcription (STAT) 3 is a key signalling protein engaged by a multitude of growth factors and cytokines to elicit diverse biological outcomes including cellular growth, differentiation, and survival. The complete loss of STAT3 is not compatible with life and even partial loss of function mutations lead to debilitating pathologies like hyper IgE syndrome. Conversely, augmented STAT3 activity has been reported in as many as 50% of all human tumours. The dogma of STAT3 activity posits that it is a tyrosine phosphorylated transcription factor which modulates the expression of hundreds of genes. However, the regulation and biological consequences of STAT3 activation are far more complex. In addition to tyrosine phosphorylation, STAT3 is decorated with a plethora of post-translational modifications which regulate STAT3's nuclear function in addition to its non-genomic activities. In addition to these emerging complexities in the biochemical regulation of STAT3 activity, recent studies reveal that STAT3 is either oncogenic or a tumour suppressor. This review will explore these complexities.
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Affiliation(s)
- Aleks C Guanizo
- a Centre for Cancer Research , Hudson Institute of Medical Research , Clayton , VIC , Australia
- b Department of Molecular and Translational Science , Monash University , Clayton , VIC , Australia
| | - Chamira Dilanka Fernando
- a Centre for Cancer Research , Hudson Institute of Medical Research , Clayton , VIC , Australia
- b Department of Molecular and Translational Science , Monash University , Clayton , VIC , Australia
| | - Daniel J Garama
- a Centre for Cancer Research , Hudson Institute of Medical Research , Clayton , VIC , Australia
- b Department of Molecular and Translational Science , Monash University , Clayton , VIC , Australia
| | - Daniel J Gough
- a Centre for Cancer Research , Hudson Institute of Medical Research , Clayton , VIC , Australia
- b Department of Molecular and Translational Science , Monash University , Clayton , VIC , Australia
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9
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Mitochondrial STAT3: Powering up a potent factor. Cytokine 2016; 87:20-5. [DOI: 10.1016/j.cyto.2016.05.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 05/21/2016] [Indexed: 11/21/2022]
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10
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Zimmers TA, Fishel ML, Bonetto A. STAT3 in the systemic inflammation of cancer cachexia. Semin Cell Dev Biol 2016; 54:28-41. [PMID: 26860754 PMCID: PMC4867234 DOI: 10.1016/j.semcdb.2016.02.009] [Citation(s) in RCA: 156] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 02/04/2016] [Indexed: 02/07/2023]
Abstract
Weight loss is diagnostic of cachexia, a debilitating syndrome contributing mightily to morbidity and mortality in cancer. Most research has probed mechanisms leading to muscle atrophy and adipose wasting in cachexia; however cachexia is a truly systemic phenomenon. Presence of the tumor elicits an inflammatory response and profound metabolic derangements involving not only muscle and fat, but also the hypothalamus, liver, heart, blood, spleen and likely other organs. This global response is orchestrated in part through circulating cytokines that rise in conditions of cachexia. Exogenous Interleukin-6 (IL6) and related cytokines can induce most cachexia symptomatology, including muscle and fat wasting, the acute phase response and anemia, while IL-6 inhibition reduces muscle loss in cancer. Although mechanistic studies are ongoing, certain of these cachexia phenotypes have been causally linked to the cytokine-activated transcription factor, STAT3, including skeletal muscle wasting, cardiac dysfunction and hypothalamic inflammation. Correlative studies implicate STAT3 in fat wasting and the acute phase response in cancer cachexia. Parallel data in non-cancer models and disease states suggest both pathological and protective functions for STAT3 in other organs during cachexia. STAT3 also contributes to cancer cachexia through enhancing tumorigenesis, metastasis and immune suppression, particularly in tumors associated with high prevalence of cachexia. This review examines the evidence linking STAT3 to multi-organ manifestations of cachexia and the potential and perils for targeting STAT3 to reduce cachexia and prolong survival in cancer patients.
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Affiliation(s)
- Teresa A Zimmers
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, United States; Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, United States; IU Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, United States; IUPUI Center for Cachexia Research Innovation and Therapy, Indiana University School of Medicine, Indianapolis, IN 46202, United States.
| | - Melissa L Fishel
- IU Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, United States; Department of Pediatrics, Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, United States; Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202, United States.
| | - Andrea Bonetto
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, United States; IU Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, United States; IUPUI Center for Cachexia Research Innovation and Therapy, Indiana University School of Medicine, Indianapolis, IN 46202, United States.
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11
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Stat3 binds to mtDNA and regulates mitochondrial gene expression in keratinocytes. J Invest Dermatol 2014; 134:1971-1980. [PMID: 24496235 PMCID: PMC4057971 DOI: 10.1038/jid.2014.68] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 09/26/2013] [Accepted: 11/05/2013] [Indexed: 11/24/2022]
Abstract
The nuclear transcription factor Stat3 has recently been reported to have a localized mitochondrial regulatory function. Current data suggest that mitochondrial Stat3 (mitoStat3) is necessary for maximal mitochondrial activity and for Ras-mediated transformation independent of Stat3 nuclear activity. We have previously shown that Stat3 plays a pivotal role in epithelial carcinogenesis. Therefore, the aim of the current study was to determine the role of mitoStat3 in epidermal keratinocytes. Herein, we show that normal and neoplastic keratinocytes contain a pool of mitoStat3. EGF and TPA induce Stat3 mitochondrial translocation mediated through phosphorylation of Stat3 at Ser727. In addition, we report that mitoStat3 binds mitochondrial DNA (mtDNA) and associates with the mitochondrial transcription factor TFAM. Furthermore, Stat3 ablation resulted in an increase of mitochondrial encoded gene transcripts. An increase in key nuclear-encoded metabolic genes, PGC-1α and NRF-1, was also observed in Stat3 null keratinocytes, however no changes in nuclear-encoded ETC gene transcripts or mtDNA copy number were observed. Collectively, our findings suggest a heretofore-unreported function for mitoStat3 as a potential mitochondrial transcription factor in keratinocytes. This mitoStat3-mtDNA interaction may represent an alternate signaling pathway that could alter mitochondrial function and biogenesis and play a role in tumorigenesis.
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Zhou Z, Gushiken FC, Bolgiano D, Salsbery BJ, Aghakasiri N, Jing N, Wu X, Vijayan KV, Rumbaut RE, Adachi R, Lopez JA, Dong JF. Signal transducer and activator of transcription 3 (STAT3) regulates collagen-induced platelet aggregation independently of its transcription factor activity. Circulation 2012; 127:476-485. [PMID: 23266857 DOI: 10.1161/circulationaha.112.132126] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Platelet hyperactivity induced by inflammation is a known risk factor for atherosclerosis and thrombosis, but its underlying mechanisms remain poorly understood. METHODS AND RESULTS The signal transducer and activator of transcription 3 (STAT3) was activated in collagen-stimulated platelets. Activated STAT3 served as a protein scaffold to facilitate the catalytic interaction between the kinase Syk (spleen tyrosine kinase) and the substrate PLCγ2 to enhance collagen-induced calcium mobilization and platelet activation. The same interaction of STAT3 with Syk and PLCγ2 was detected in HEK293 cells transfected with cDNAs for Syk and PLCγ2 and stimulated with interleukin-6. Pharmacological inhibition of STAT3 blocked ≈50% of collagen- and a collagen-related peptide-induced but not thrombin receptor-activating peptide- or ADP-induced aggregation and ≈80% of thrombus formation of human platelets on a collagen matrix. This in vitro phenotype was reproduced in mice infused with STAT3 inhibitors and mice with platelet-specific STAT3 deficiency. By forming a complex with its soluble receptor, the proinflammatory cytokine interleukin-6 enhanced the collagen-induced STAT3 activation in human platelets. CONCLUSIONS These data demonstrate a nontranscriptional activity of STAT3 that facilitates a crosstalk between proinflammatory cytokine and hemostasis/thrombosis signals in platelets. This crosstalk may be responsible for the platelet hyperactivity found in conditions of inflammation.
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Affiliation(s)
- Zhou Zhou
- Puget Sound Blood Research Institute, Seattle, WA
| | - Francisca C Gushiken
- Department of Leukemia, the University of Texas M. D. Anderson Cancer Center, Houston, TX
| | | | | | | | - Naijie Jing
- Section of Infectious Diseases, Baylor College of Medicine, Houston, TX
| | - Xiaoping Wu
- Puget Sound Blood Research Institute, Seattle, WA
| | - K Vinod Vijayan
- Section of Cardiovascular Sciences, Baylor College of Medicine, Houston, TX
| | - Rolando E Rumbaut
- Section of Critical Care and Pulmonary Medicine, Department of Medicine, Baylor College of Medicine, Houston, TX.,Michael E. DeBakey VA Medical Center, Houston, TX
| | - Roberto Adachi
- Pulmonary Medicine, the University of Texas M. D. Anderson Cancer Center, Houston, TX
| | - Jose A Lopez
- Puget Sound Blood Research Institute, Seattle, WA.,Division of Hematology, Department of Medicine, University of Washington, School of Medicine, Seattle, WA
| | - Jing-Fei Dong
- Puget Sound Blood Research Institute, Seattle, WA.,General Hospital, Tianjin Medical University, Tianjin, China.,Division of Hematology, Department of Medicine, University of Washington, School of Medicine, Seattle, WA
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13
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Gianotti TF, Castaño G, Gemma C, Burgueño AL, Rosselli MS, Pirola CJ, Sookoian S. Mitochondrial DNA copy number is modulated by genetic variation in the signal transducer and activator of transcription 3 (STAT3). Metabolism 2011; 60:1142-9. [PMID: 21310444 DOI: 10.1016/j.metabol.2010.12.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 12/14/2010] [Accepted: 12/15/2010] [Indexed: 12/25/2022]
Abstract
The regulation of mitochondrial DNA (mtDNA) copy number not only is critical for the maintenance of the normal mitochondrial function but has a strong clinical significance. A recent report revealed that the signal transducer and activator of transcription 3 (STAT3) is involved in the regulation of the mitochondrial function and is required for the optimal function of the electron transport chain. In this study, we explored whether gene variants in the STAT3 influence the leukocyte mtDNA copy number. Clinical data and blood samples were collected from 179 subjects (aged 52.8 ± 0.9 years). Mitochondrial DNA quantification using nuclear DNA (nDNA) as a reference was carried out by a real-time quantitative polymerase chain reaction method; results are presented as the mtDNA/nDNA ratio. We selected 3 tag single nucleotide polymorphisms showing a minor allele frequency greater than 10% (rs2293152 C/G, rs6503695 C/T, and rs9891119 A/C), representing 24 polymorphic sites of the STAT3 (r(2) > 0.8). We observed a significant association between mtDNA/nDNA ratio and both rs6503695 and rs9891119, adjusted by age and homeostasis model assessment index. The proportion of the total variance of the mtDNA/nDNA ratio accounted for by the rs6503695 and rs9891119 genotypes was 4.7% and 6.53%, respectively. Common variation in the STAT3 may influence mtDNA copy number.
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Affiliation(s)
- Tomas Fernández Gianotti
- Department of Molecular Genetics and Biology of Complex Diseases, Institute of Medical Research A Lanari-IDIM, University of Buenos Aires-CONICET, Ciudad Autónoma de Buenos Aires, Argentina
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14
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Simpson-Haidaris PJ, Seweryniak KE, Spinelli SL, Garcia-Bates TM, Murant TI, Pollock SJ, Sime PJ, Phipps RP. A putative role for platelet-derived PPARγ in vascular homeostasis demonstrated by anti-PPARγ induction of bleeding, thrombocytopenia and compensatory megakaryocytopoiesis. J Biotechnol 2010; 150:417-27. [PMID: 20888877 DOI: 10.1016/j.jbiotec.2010.09.955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 09/16/2010] [Accepted: 09/23/2010] [Indexed: 01/11/2023]
Abstract
Widely known for its role in adipogenesis and energy metabolism, PPARγ also plays a role in platelet function. To further understand functions of platelet-derived PPARγ, we produced rabbit polyclonal (PoAbs) and mouse monoclonal (MoAbs) antibodies against PPARγ 14mer/19mer peptide-immunogens. Unexpectedly, our work produced two key findings. First, MoAbs but not PoAbs produced against PPARγ peptide-immunogens displayed antigenic crossreactivity with highly conserved PPARα and PPARβ/δ. Similarly, Santa Cruz PoAb sc-7196 was monospecific for PPARγ while MoAb sc-7273 crossreacted with PPARα and PPARβ/δ. Second, immunized rabbits and mice exhibited unusual pathology including cachexia, excessive bleeding, and low platelet counts leading to thrombocytopenia. Spleens from immunized mice were fatty, hemorrhagic and friable. Although passive administration of anti-PPARγ PoAbs failed to induce experimental thrombocytopenia, megakaryocytopoiesis was induced 4-8-fold in mouse spleens. Similarly, marrow megakaryocytopoiesis was enhanced 1.8-4-fold in immunized rabbits. These peptide-immunogens are 100% conserved in human, rabbit and mouse; thus, immune-mediated platelet destruction via crossreactivity with platelet-derived PPARγ likely caused bleeding, thrombocytopenia, and compensatory megakaryocytopoiesis. Such overt pathology would cause significant problems for large-scale production of anti-PPARγ PoAbs. Furthermore, a major pitfall associated with MoAb production against closely related molecules is that monoclonicity does not guarantee monospecificity, an issue worth further scientific scrutiny.
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Affiliation(s)
- Patricia J Simpson-Haidaris
- Department of Medicine, University of Rochester School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA. pj
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Eidelman O, Jozwik C, Huang W, Srivastava M, Rothwell SW, Jacobowitz DM, Ji X, Zhang X, Guggino W, Wright J, Kiefer J, Olsen C, Adimi N, Mueller GP, Pollard HB. Gender dependence for a subset of the low-abundance signaling proteome in human platelets. HUMAN GENOMICS AND PROTEOMICS : HGP 2010; 2010:164906. [PMID: 20981232 PMCID: PMC2958630 DOI: 10.4061/2010/164906] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Accepted: 01/05/2010] [Indexed: 11/23/2022]
Abstract
The incidence of cardiovascular diseases is ten-times higher in males than females, although the biological basis for this gender disparity is not known. However, based on the fact that antiplatelet drugs are the mainstay for prevention and therapy, we hypothesized that the signaling proteomes in platelets from normal male donors might be more activated than platelets from normal female donors. We report here that platelets from male donors express significantly higher levels of signaling cascade proteins than platelets from female
donors. In silico connectivity analysis shows that the 24 major hubs in platelets from male donors focus on pathways associated with megakaryocytic expansion and platelet activation. By contrast, the 11 major hubs in platelets from female donors were found to be either negative or neutral for platelet-relevant processes. The difference may suggest a biological mechanism for gender discrimination in cardiovascular disease.
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Affiliation(s)
- Ofer Eidelman
- Department of Anatomy, Physiology and Genetics, USU Center for Medical Proteomics, Uniformed Services University, School of Medicine, USUHS, 4301 Jones Bridge Road, Bethesda, MD 20814, USA
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