1
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Kamato D, Gabr M, Kumarapperuma H, Chia ZJ, Zheng W, Xu S, Osman N, Little PJ. Gαq Is the Specific Mediator of PAR-1 Transactivation of Kinase Receptors in Vascular Smooth Muscle Cells. Int J Mol Sci 2022; 23:ijms232214425. [PMID: 36430902 PMCID: PMC9692893 DOI: 10.3390/ijms232214425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 11/14/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
AIMS G protein-coupled receptor (GPCR) transactivation of kinase receptors greatly expands the actions attributable to GPCRs. Thrombin, via its cognate GPCR, protease-activated receptor (PAR)-1, transactivates tyrosine and serine/threonine kinase receptors, specifically the epidermal growth factor receptor and transforming growth factor-β receptor, respectively. PAR-1 transactivation-dependent signalling leads to the modification of lipid-binding proteoglycans involved in the retention of lipids and the development of atherosclerosis. The mechanisms of GPCR transactivation of kinase receptors are distinct. We aimed to investigate the role of proximal G proteins in transactivation-dependent signalling. MAIN METHODS Using pharmacological and molecular approaches, we studied the role of the G⍺ subunits, G⍺q and G⍺11, in the context of PAR-1 transactivation-dependent signalling leading to proteoglycan modifications. KEY FINDINGS Pan G⍺q subunit inhibitor UBO-QIC/FR900359 inhibited PAR-1 transactivation of kinase receptors and proteoglycans modification. The G⍺q/11 inhibitor YM254890 did not affect PAR-1 transactivation pathways. Molecular approaches revealed that of the two highly homogenous G⍺q members, G⍺q and G⍺11, only the G⍺q was involved in regulating PAR-1 mediated proteoglycan modification. Although G⍺q and G⍺11 share approximately 90% homology at the protein level, we show that the two isoforms exhibit different functional roles. SIGNIFICANCE Our findings may be extrapolated to other GPCRs involved in vascular pathology and highlight the need for novel pharmacological tools to assess the role of G proteins in GPCR signalling to expand the preeminent position of GPCRs in human therapeutics.
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Affiliation(s)
- Danielle Kamato
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia
- School of Environment and Science, Griffith University, Nathan, QLD 4111, Australia
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD 4102, Australia
- Correspondence:
| | - Mai Gabr
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD 4102, Australia
| | - Hirushi Kumarapperuma
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD 4102, Australia
| | - Zheng J. Chia
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD 4102, Australia
| | - Wenhua Zheng
- Centre of Reproduction, Development & Aging and Institute of Translation Medicine, Faculty of Health Sciences, University of Macau, Taipa, Macau 999078, China
| | - Suowen Xu
- Institute of Endocrine and Metabolic Diseases, The First Affiliated Hospital of University of Science and Technology of China, Hefei 230052, China
| | - Narin Osman
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC 3083, Australia
| | - Peter J. Little
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD 4102, Australia
- Department of Pharmacy, Guangzhou Xinhua University, Guangzhou 510520, China
- Sunshine Coast Health Institute, University of the Sunshine Coast, Birtinya, QLD 4575, Australia
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2
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Suzuki T, Kropski JA, Chen J, Carrier EJ, Chen X, Sherrill TP, Winters NI, Camarata JE, Polosukhin VV, Han W, Rathinasabapathy A, Gutor S, Gulleman P, Sabusap C, Banovich NE, Tanjore H, Freeman ML, Tada Y, Young LR, Gokey JJ, Blackwell TS, West JD. Thromboxane-Prostanoid Receptor Signaling Drives Persistent Fibroblast Activation in Pulmonary Fibrosis. Am J Respir Crit Care Med 2022; 206:596-607. [PMID: 35728047 PMCID: PMC9716913 DOI: 10.1164/rccm.202106-1503oc] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 06/28/2022] [Indexed: 11/16/2022] Open
Abstract
Rationale: Although persistent fibroblast activation is a hallmark of idiopathic pulmonary fibrosis (IPF), mechanisms regulating persistent fibroblast activation in the lungs have not been fully elucidated. Objectives: On the basis of our observation that lung fibroblasts express TBXA2R (thromboxane-prostanoid receptor) during fibrosis, we investigated the role of TBXA2R signaling in fibrotic remodeling. Methods: We identified TBXA2R expression in lungs of patients with IPF and mice and studied primary mouse and human lung fibroblasts to determine the impact of TBXA2R signaling on fibroblast activation. We used TBXA2R-deficient mice and small-molecule inhibitors to investigate TBXA2R signaling in preclinical lung fibrosis models. Measurements and Main Results: TBXA2R expression was upregulated in fibroblasts in the lungs of patients with IPF and in mouse lungs during experimental lung fibrosis. Genetic deletion of TBXA2R, but not inhibition of thromboxane synthase, protected mice from bleomycin-induced lung fibrosis, thereby suggesting that an alternative ligand activates profibrotic TBXA2R signaling. In contrast to thromboxane, F2-isoprostanes, which are nonenzymatic products of arachidonic acid induced by reactive oxygen species, were persistently elevated during fibrosis. F2-isoprostanes induced TBXA2R signaling in fibroblasts and mediated a myofibroblast activation profile due, at least in part, to potentiation of TGF-β (transforming growth factor-β) signaling. In vivo treatment with the TBXA2R antagonist ifetroban reduced profibrotic signaling in the lungs, protected mice from lung fibrosis in three preclinical models (bleomycin, Hermansky-Pudlak mice, and radiation-induced fibrosis), and markedly enhanced fibrotic resolution after bleomycin treatment. Conclusions: TBXA2R links oxidative stress to fibroblast activation during lung fibrosis. TBXA2R antagonists could have utility in treating pulmonary fibrosis.
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Affiliation(s)
- Toshio Suzuki
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
- Department of Medical Oncology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Jonathan A. Kropski
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee
- Department of Medicine, Department of Veterans Affairs Medical Center, Nashville, Tennessee
| | - Jingyuan Chen
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Erica J. Carrier
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Xinping Chen
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Taylor P. Sherrill
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Nichelle I. Winters
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Jane E. Camarata
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Vasiliy V. Polosukhin
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Wei Han
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | | | - Sergey Gutor
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Peter Gulleman
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Carleen Sabusap
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | | | - Harikrishna Tanjore
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Michael L. Freeman
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Yuji Tada
- Department of Pulmonary Medicine, School of Medicine, International University of Health and Welfare, Chiba, Japan; and
| | - Lisa R. Young
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
- Division of Pulmonary Medicine, Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Jason J. Gokey
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
| | - Timothy S. Blackwell
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee
- Department of Medicine, Department of Veterans Affairs Medical Center, Nashville, Tennessee
| | - James D. West
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, and
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3
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Afroz R, Kumarapperuma H, Nguyen QVN, Mohamed R, Little PJ, Kamato D. Lipopolysaccharide acting via toll-like receptor 4 transactivates the TGF-β receptor in vascular smooth muscle cells. Cell Mol Life Sci 2022; 79:121. [PMID: 35122536 PMCID: PMC8817999 DOI: 10.1007/s00018-022-04159-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 01/06/2022] [Accepted: 01/20/2022] [Indexed: 12/11/2022]
Abstract
Toll-like receptors (TLRs) recognise pathogen‑associated molecular patterns, which allow the detection of microbial infection by host cells. Bacterial-derived toxin lipopolysaccharide activates TLR4 and leads to the activation of the Smad2 transcription factor. The phosphorylation of the Smad2 transcription factor is the result of the activation of the transforming growth factor-β receptor 1 (TGFBR1). Therefore, we sought to investigate LPS via TLR4-mediated Smad2 carboxy terminal phosphorylation dependent on the transactivation of the TGFBR1. The in vitro model used human aortic vascular smooth muscle cells to assess the implications of TLR4 transactivation of the TGFBR1 in vascular pathophysiology. We show that LPS-mediated Smad2 carboxy terminal phosphorylation is inhibited in the presence of TGFBR1 inhibitor, SB431542. Treatment with MyD88 and TRIF pathway antagonists does not affect LPS-mediated phosphorylation of Smad2 carboxy terminal; however, LPS-mediated Smad2 phosphorylation was inhibited in the presence of MMP inhibitor, GM6001, and unaffected in the presence of ROCK inhibitor Y27632 or ROS/NOX inhibitor DPI. LPS via transactivation of the TGFBR1 stimulates PAI-1 mRNA expression. TLRs are first in line to respond to exogenous invading substances and endogenous molecules; our findings characterise a novel signalling pathway in the context of cell biology. Identifying TLR transactivation of the TGFBR1 may provide future insight into the detrimental implications of pathogens in pathophysiology.
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Affiliation(s)
- Rizwana Afroz
- School of Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD, 4102, Australia.,Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, QLD, 4111, Australia
| | - Hirushi Kumarapperuma
- School of Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD, 4102, Australia
| | - Quang V N Nguyen
- School of Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD, 4102, Australia
| | - Raafat Mohamed
- School of Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD, 4102, Australia.,Department of Basic Sciences, College of Dentistry, University of Mosul, Mosul, Iraq
| | - Peter J Little
- School of Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD, 4102, Australia.,Department of Pharmacy, Xinhua College of Sun Yat-Sen University, Tianhe District, Guangzhou, 510520, China.,Sunshine Coast Health Institute, University of the Sunshine Coast, Birtinya, QLD, 4575, Australia
| | - Danielle Kamato
- School of Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, QLD, 4102, Australia.
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4
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Kamato D, Little PJ. Smad2 linker region phosphorylation is an autonomous cell signalling pathway: Implications for multiple disease pathologies. Biomed Pharmacother 2020; 124:109854. [DOI: 10.1016/j.biopha.2020.109854] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/13/2020] [Accepted: 01/16/2020] [Indexed: 12/18/2022] Open
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5
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Mohamed R, Cao Y, Afroz R, Xu S, Ta HT, Barras M, Zheng W, Little PJ, Kamato D. ROS directly activates transforming growth factor β type 1 receptor signalling in human vascular smooth muscle cells. Biochim Biophys Acta Gen Subj 2020; 1864:129463. [DOI: 10.1016/j.bbagen.2019.129463] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 09/25/2019] [Accepted: 10/07/2019] [Indexed: 12/11/2022]
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6
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The Emerging Role of Gβ Subunits in Human Genetic Diseases. Cells 2019; 8:cells8121567. [PMID: 31817184 PMCID: PMC6952978 DOI: 10.3390/cells8121567] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 11/23/2019] [Accepted: 11/29/2019] [Indexed: 12/20/2022] Open
Abstract
Environmental stimuli are perceived and transduced inside the cell through the activation of signaling pathways. One common type of cell signaling transduction network is initiated by G-proteins. G-proteins are activated by G-protein-coupled receptors (GPCRs) and transmit signals from hormones, neurotransmitters, and other signaling factors, thus controlling a number of biological processes that include synaptic transmission, visual photoreception, hormone and growth factors release, regulation of cell contraction and migration, as well as cell growth and differentiation. G-proteins mainly act as heterotrimeric complexes, composed of alpha, beta, and gamma subunits. In the last few years, whole exome sequencing and biochemical studies have shown causality of disease-causing variants in genes encoding G-proteins and human genetic diseases. This review focuses on the G-protein β subunits and their emerging role in the etiology of genetically inherited rare diseases in humans.
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7
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Mohamed R, Janke R, Guo W, Cao Y, Zhou Y, Zheng W, Babaahmadi-Rezaei H, Xu S, Kamato D, Little PJ. GPCR transactivation signalling in vascular smooth muscle cells: role of NADPH oxidases and reactive oxygen species. VASCULAR BIOLOGY (BRISTOL, ENGLAND) 2019; 1:R1-R11. [PMID: 32923966 PMCID: PMC7439842 DOI: 10.1530/vb-18-0004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 07/23/2019] [Indexed: 02/02/2023]
Abstract
The discovery and extension of G-protein-coupled receptor (GPCR) transactivation-dependent signalling has enormously broadened the GPCR signalling paradigm. GPCRs can transactivate protein tyrosine kinase receptors (PTKRs) and serine/threonine kinase receptors (S/TKRs), notably the epidermal growth factor receptor (EGFR) and transforming growth factor-β type 1 receptor (TGFBR1), respectively. Initial comprehensive mechanistic studies suggest that these two transactivation pathways are distinct. Currently, there is a focus on GPCR inhibitors as drug targets, and they have proven to be efficacious in vascular diseases. With the broadening of GPCR transactivation signalling, it is therefore important from a therapeutic perspective to find a common transactivation pathway of EGFR and TGFBR1 that can be targeted to inhibit complex pathologies activated by the combined action of these receptors. Reactive oxygen species (ROS) are highly reactive molecules and they act as second messengers, thus modulating cellular signal transduction pathways. ROS are involved in different mechanisms of GPCR transactivation of EGFR. However, the role of ROS in GPCR transactivation of TGFBR1 has not yet been studied. In this review, we will discuss the involvement of ROS in GPCR transactivation-dependent signalling.
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Affiliation(s)
- Raafat Mohamed
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Queensland, Australia
- Department of Basic Sciences, College of Dentistry, University of Mosul, Mosul, Iraq
| | - Reearna Janke
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Queensland, Australia
| | - Wanru Guo
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Queensland, Australia
| | - Yingnan Cao
- Department of Pharmacy, Xinhua College of Sun Yat-sen University, Guangzhou, China
| | - Ying Zhou
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Queensland, Australia
| | - Wenhua Zheng
- Faculty of Health Sciences, University of Macau, Taipa, Macau, China
| | - Hossein Babaahmadi-Rezaei
- Department of Clinical Biochemistry, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Atherosclerosis Research Center, Ahvaz, Iran
| | - Suowen Xu
- Department of Medicine, Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
| | - Danielle Kamato
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Queensland, Australia
- Department of Pharmacy, Xinhua College of Sun Yat-sen University, Guangzhou, China
| | - Peter J Little
- School of Pharmacy, Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Queensland, Australia
- Department of Pharmacy, Xinhua College of Sun Yat-sen University, Guangzhou, China
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8
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Kamato D, Ta H, Afroz R, Xu S, Osman N, Little PJ. Mechanisms of PAR-1 mediated kinase receptor transactivation: Smad linker region phosphorylation. J Cell Commun Signal 2019; 13:539-548. [PMID: 31290007 DOI: 10.1007/s12079-019-00527-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 07/02/2019] [Indexed: 01/08/2023] Open
Abstract
Protease activated receptors (PARs) transactivate both epidermal growth factor receptors (EGFR) and transforming growth factor (TGF)-β receptors (TGFBR1) in vascular smooth muscle leading to the increased expression of genes (CHST11 and CHSY1) which are rate limiting for the enzymes that mediate hyperelongation of glycosaminoglycan (GAG) chains on the lipid-binding proteoglycan, biglycan. This is an excellent model to investigate mechanisms of transactivation as the processes are biochemically distinct. EGFR transactivation is dependent on the classical matrix metalloprotease (MMP) based triple membrane bypass mechanism and TGFBR1 transactivation is dependent on Rho/ROCK signalling and integrins. We have shown that all kinase receptor signalling is targeted towards phosphorylation of the linker region of the transcription factor, Smad2. We investigated the mechanisms of thrombin mediated kinase receptor transactivation signalling using anti-phospho antibodies and Western blotting and gene expression by RT-PCR. Thrombin stimulation of phospho-Smad2 (Ser 245/250/255) and of phospho-Smad2(Thr220) via EGFR transactivation commences quickly and extends out to at least 4 h whereas transactivation via TGFBR1 is delayed for 120 min but also persists for at least 4 h. Signalling of thrombin stimulated Smad linker region phosphorylation is approximately equally inhibited by the MMP inhibitor, GM6001 and the ROCK inhibitor, Y27632, and similarly expression of CHST11 and CHSY1 is approximately equally inhibited by GM6001 and Y27632. The data establishes Smad linker region phosphorylation as a central target of all transactivation signalling of GAG gene expression and thus an upstream kinase may be a target to prevent all transactivation signalling and its pathophysiological consequences.
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Affiliation(s)
- Danielle Kamato
- School of Pharmacy, University of Queensland, The University of Queensland, 20 Cornwall Street, Woolloongabba, QLD 4102, Australia. .,Department of Pharmacy, Xinhua College of Sun Yat-sen University, Tianhe District, Guangzhou, 510520, China.
| | - Hang Ta
- School of Pharmacy, University of Queensland, The University of Queensland, 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
| | - Rizwana Afroz
- School of Pharmacy, University of Queensland, The University of Queensland, 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
| | - Suowen Xu
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
| | - Narin Osman
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC, 3083, Australia.,Department of Immunology and Pathology, Monash University, Melbourne, VIC, 3004, Australia
| | - Peter J Little
- School of Pharmacy, University of Queensland, The University of Queensland, 20 Cornwall Street, Woolloongabba, QLD 4102, Australia.,Department of Pharmacy, Xinhua College of Sun Yat-sen University, Tianhe District, Guangzhou, 510520, China
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9
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Kamato D, Burch M, Zhou Y, Mohamed R, Stow JL, Osman N, Zheng W, Little PJ. Individual Smad2 linker region phosphorylation sites determine the expression of proteoglycan and glycosaminoglycan synthesizing genes. Cell Signal 2018; 53:365-373. [PMID: 30423352 DOI: 10.1016/j.cellsig.2018.11.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 11/09/2018] [Accepted: 11/09/2018] [Indexed: 01/04/2023]
Abstract
Growth factors such as thrombin and transforming growth factor (TGF)-β facilitate glycosaminoglycan (GAG) chain hyperelongation on proteoglycans, a phenomenon that increases lipoprotein binding in the vessel wall and the development of atherosclerosis. TGF-β signals via canonical carboxy terminal phosphorylation of R-Smads and also non-canonical linker region phosphorylation of R-Smads. The G protein coupled receptor agonist, thrombin, can transactivate the TGF-β receptor leading to both canonical and non-canonical Smad signalling. Linker region phosphorylation drives the expression of genes for the synthesis of the proteoglycan, biglycan. Proteoglycan synthesis involves core protein synthesis, the initiation of GAG chains and the subsequent elongation of GAG chains. We have explored the relationship between the thrombin stimulated phosphorylation of individual serine and threonine sites in the linker region of Smad2 and the expression of GAG initiation xylosyltransferase-1 (XT-1) and GAG elongation chondroitin 4-sulfotransferase-1 (C4ST-1) and chondroitin synthase-1 (CHSY-1) genes. Thrombin stimulated the phosphorylation of all four target residues (Thr220, Ser245, Ser250 and Ser255 residues) with a similar temporal pattern - phosphorylation was maximal at 15 min (the earliest time point studied) and the level of the phospho-proteins declined thereafter over the following 4 h. Jnk, p38 and PI3K, selectively mediated the phosphorylation of the Thr220 residue whereas the serine residues were variously phosphorylated by multiple kinases. Thrombin stimulated the expression of all three genes - XT-1, C4ST-1 and CHSY-1. The three pathways mediating Thr220 phosphorylation were also involved in the expression of XT-1. The target pathways (excluding Jnk) were involved in the expression of the GAG elongation genes (C4ST-1 and CHSY-1). These findings support the contention that individual Smad linker region phosphorylation sites are linked to the expression of genes for the initiation and elongation of GAG chains on proteoglycans. The context of this work is that a specific inhibitor of GAG elongation represents a potential therapeutic agent for preventing GAG elongation and lipid binding and the results indicate that the specificity of the pathways is such that it might be therapeutically feasible to specifically target GAG elongation without interfering with other physiological processes with which proteoglycans are involved.
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Affiliation(s)
- Danielle Kamato
- School of Pharmacy, University of Queensland, Pharmacy Australia Centre of Excellence, Woolloongabba, QLD 4102, Australia; Department of Pharmacy, Xinhua College of Sun Yat-sen University, Tianhe District, Guangzhou 510520, China.
| | - Micah Burch
- Department of Cardiovascular Medicine, Brigham and Harvard Medical School, Boston, MA 02115, USA
| | - Ying Zhou
- School of Pharmacy, University of Queensland, Pharmacy Australia Centre of Excellence, Woolloongabba, QLD 4102, Australia
| | - Raafat Mohamed
- School of Pharmacy, University of Queensland, Pharmacy Australia Centre of Excellence, Woolloongabba, QLD 4102, Australia
| | - Jennifer L Stow
- Institute for Molecular Bioscience, University of Queensland, St Lucia, QLD, 4067, Australia
| | - Narin Osman
- School of Pharmacy, University of Queensland, Pharmacy Australia Centre of Excellence, Woolloongabba, QLD 4102, Australia; School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC 3083, Australia; Department of Immunology and Pathology, Monash University, Melbourne, VIC 3004, Australia
| | - Wenhua Zheng
- School of Pharmacy, University of Queensland, Pharmacy Australia Centre of Excellence, Woolloongabba, QLD 4102, Australia; Faculty of Health Sciences, University of Macau, Taipa, China
| | - Peter J Little
- School of Pharmacy, University of Queensland, Pharmacy Australia Centre of Excellence, Woolloongabba, QLD 4102, Australia; Department of Pharmacy, Xinhua College of Sun Yat-sen University, Tianhe District, Guangzhou 510520, China
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10
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TGF-β receptors: In and beyond TGF-β signaling. Cell Signal 2018; 52:112-120. [PMID: 30184463 DOI: 10.1016/j.cellsig.2018.09.002] [Citation(s) in RCA: 262] [Impact Index Per Article: 43.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 08/07/2018] [Accepted: 09/01/2018] [Indexed: 02/07/2023]
Abstract
Transforming growth factor β (TGF-β) plays an important role in normal development and homeostasis. Dysregulation of TGF-β responsiveness and its downstream signaling pathways contribute to many diseases, including cancer initiation, progression, and metastasis. TGF-β ligands bind to three isoforms of the TGF-β receptor (TGFBR) with different affinities. TGFBR1 and 2 are both serine/threonine and tyrosine kinases, but TGFBR3 does not have any kinase activity. They are necessary for activating canonical or noncanonical signaling pathways, as well as for regulating the activation of other signaling pathways. Another prominent feature of TGF-β signaling is its context-dependent effects, temporally and spatially. The diverse effects and context dependency are either achieved by fine-tuning the downstream components or by regulating the expressions and activities of the ligands or receptors. Focusing on the receptors in events in and beyond TGF-β signaling, we review the membrane trafficking of TGFBRs, the kinase activity of TGFBR1 and 2, the direct interactions between TGFBR2 and other receptors, and the novel roles of TGFBR3.
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11
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Afroz R, Cao Y, Rostam MA, Ta H, Xu S, Zheng W, Osman N, Kamato D, Little PJ. Signalling pathways regulating galactosaminoglycan synthesis and structure in vascular smooth muscle: Implications for lipoprotein binding and atherosclerosis. Pharmacol Ther 2018; 187:88-97. [DOI: 10.1016/j.pharmthera.2018.02.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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12
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G protein coupled receptors can transduce signals through carboxy terminal and linker region phosphorylation of Smad transcription factors. Life Sci 2018; 199:10-15. [DOI: 10.1016/j.lfs.2018.03.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 02/23/2018] [Accepted: 03/02/2018] [Indexed: 11/22/2022]
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13
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Talati N, Kamato D, Piva TJ, Little PJ, Osman N. Thrombin promotes PAI-1 expression and migration in keratinocytes via ERK dependent Smad linker region phosphorylation. Cell Signal 2018; 47:37-43. [PMID: 29577978 DOI: 10.1016/j.cellsig.2018.03.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 02/19/2018] [Accepted: 03/20/2018] [Indexed: 01/18/2023]
Abstract
Keratinocyte proliferation and migration is essential during re-epithelialisation for the restoration of the epithelial barrier during skin wound healing. Numerous growth factors are involved in the stimulation of keratinocyte proliferation and migration. The signalling pathways that drive these processes during wound healing are not well defined. This study investigated thrombin-mediated signalling in keratinocytes. The thrombin receptor, protease-activated receptor 1 (PAR-1) is a seven transmembrane G-protein coupled receptor that is known to transactivate the epidermal growth factor receptor (EGFR). Immortalized human keratinocytes (HaCaT cells) were treated with thrombin and selective inhibitors to EGFR and MAP kinases. Whole cell lysates were separated on SDS-PAGE and analysed by Western blot using antibodies against transcription factor Smad2. Quantitative real-time polymerase chain reaction was used to measure the mRNA expression of PAI-1 while scratch wound assays were used to measure keratinocyte migration. Western blot data showed that thrombin mediates PAR-1 transactivation of EGFR and the downstream phosphorylation of the transcription factor Smad2 linker (Smad2L) region. ERK1/2 inhibition by UO126 caused a decrease in Smad2L phosphorylation while the p38 inhibitor SB202190 and JNK inhibitor SP600125 did not. Smad2L Ser250 was specifically phosphorylated by this thrombin mediated pathway while Ser245 and Ser255 were not. Thrombin increased PAI-1 mRNA expression and keratinocyte migration and this was reduced when either EGFR or ERK1/2 were blocked. Taken together these results show that thrombin mediated mRNA expression of PAI-1 in keratinocytes and migration occurs via EGFR transactivation and involves signalling intermediates ERK1/2 and Smad2 and may be a key pathway in skin wound healing.
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Affiliation(s)
- Nirali Talati
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC 3083, Australia
| | - Danielle Kamato
- School of Pharmacy, The University of Queensland, Wooloongabba, QLD 4102, Australia
| | - Terrence J Piva
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC 3083, Australia
| | - Peter J Little
- School of Pharmacy, The University of Queensland, Wooloongabba, QLD 4102, Australia; Department of Pharmacy, Xinhua College of Sun Yat-sen University, Guangzhou 510520, China
| | - Narin Osman
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC 3083, Australia; School of Pharmacy, The University of Queensland, Wooloongabba, QLD 4102, Australia; Department of Immunology, Monash University, Melbourne, VIC 3004, Australia.
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14
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Sharifat N, Mohammad Zadeh G, Ghaffari MA, Dayati P, Kamato D, Little PJ, Babaahmadi-Rezaei H. Endothelin-1 (ET-1) stimulates carboxy terminal Smad2 phosphorylation in vascular endothelial cells by a mechanism dependent on ET receptors and de novo protein synthesis. ACTA ACUST UNITED AC 2016; 69:66-72. [PMID: 27905105 DOI: 10.1111/jphp.12654] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 09/18/2016] [Indexed: 12/11/2022]
Abstract
OBJECTIVE G protein-coupled receptor (GPCR) agonists through their receptors can transactivate protein tyrosine kinase receptors such as epidermal growth factor receptor and serine/threonine kinase receptors most notably transforming growth factor (TGF)-β receptor (TβRI). This signalling mechanism represents a major expansion in the cellular outcomes attributable to GPCR signalling. This study addressed the role and mechanisms involved in GPCR agonist, endothelin-1 (ET-1)-mediated transactivation of the TβRI in bovine aortic endothelial cells (BAECs). METHOD The in-vitro model used BAECs. Signalling intermediate phospho-Smad2 in the carboxy terminal was detected and quantified by Western blotting. KEY FINDING ET-1 treatment of BAECs resulted in a time and concentration-dependent increase in pSmad2C. Peak phosphorylation was evident with 100 nm treatment of ET-1 at 4-6 h. TβRI antagonist, SB431542 inhibited ET-1-mediated pSmad2C. In the presence of bosentan, a mixed ETA and ETB receptor antagonist ET-1-mediated pSmad2C levels were inhibited. The ET-mediated pSmad2C was blocked by the protein synthesis inhibitor, cycloheximide. CONCLUSION In BAECs, ET-1 via the ETB receptor is involved in transactivation of the TβRI. The transactivation-dependent response is dependent upon de novo protein synthesis.
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Affiliation(s)
- Narges Sharifat
- Student Research Committee, Department of Clinical Biochemistry, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Ghorban Mohammad Zadeh
- Hyperlipidemia Research Center, Department of Clinical Biochemistry, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mohammad-Ali Ghaffari
- Cellular and Molecular Research Center, Ahvaz Jundishapour University of Medical Sciences, Ahvaz, Iran
| | - Parisa Dayati
- Student Research Committee, Department of Clinical Biochemistry, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Danielle Kamato
- Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Qld, Australia
| | - Peter J Little
- Pharmacy Australia Centre of Excellence, The University of Queensland, Woolloongabba, Qld, Australia
| | - Hossein Babaahmadi-Rezaei
- Department of Clinical Biochemistry, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Atherosclerosis Research Center, Ahvaz, Iran
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15
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The role of specific Smad linker region phosphorylation in TGF-β mediated expression of glycosaminoglycan synthesizing enzymes in vascular smooth muscle. Cell Signal 2016; 28:956-66. [PMID: 27153775 DOI: 10.1016/j.cellsig.2016.05.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/27/2016] [Accepted: 05/02/2016] [Indexed: 01/15/2023]
Abstract
Hyperelongation of glycosaminoglycan chains on proteoglycans facilitates increased lipoprotein binding in the blood vessel wall and the development of atherosclerosis. Increased mRNA expression of glycosaminoglycan chain synthesizing enzymes in vivo is associated with the development of atherosclerosis. In human vascular smooth muscle, transforming growth factor-β (TGF-β) regulates glycosaminoglycan chain hyperelongation via ERK and p38 as well as Smad2 linker region (Smad2L) phosphorylation. In this study, we identified the involvement of TGF-β receptor, intracellular serine/threonine kinases and specific residues on transcription factor Smad2L that regulate glycosaminoglycan synthesizing enzymes. Of six glycosaminoglycan synthesizing enzymes, xylosyltransferase-1, chondroitin sulfate synthase-1, and chondroitin sulfotransferase-1 were regulated by TGF-β. In addition ERK, p38, PI3K and CDK were found to differentially regulate mRNA expression of each enzyme. Four individual residues in the TGF-β receptor mediator Smad2L can be phosphorylated by these kinases and in turn regulate the synthesis and activity of glycosaminoglycan synthesizing enzymes. Smad2L Thr220 was phosphorylated by CDKs and Smad2L Ser250 by ERK. p38 selectively signalled via Smad2L Ser245. Phosphorylation of Smad2L serine residues induced glycosaminoglycan synthesizing enzymes associated with glycosaminoglycan chain elongation. Phosphorylation of Smad2L Thr220 was associated with XT-1 enzyme regulation, a critical enzyme in chain initiation. These findings provide a deeper understanding of the complex signalling pathways that contribute to glycosaminoglycan chain modification that could be targeted using pharmacological agents to inhibit the development of atherosclerosis.
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16
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Protease activated receptor-1 mediated dual kinase receptor transactivation stimulates the expression of glycosaminoglycan synthesizing genes. Cell Signal 2016; 28:110-9. [DOI: 10.1016/j.cellsig.2015.11.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 11/04/2015] [Indexed: 11/21/2022]
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17
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Tirupula KC, Ithychanda SS, Mohan ML, Naga Prasad SV, Qin J, Karnik SS. G protein-coupled receptors directly bind filamin A with high affinity and promote filamin phosphorylation. Biochemistry 2015; 54:6673-83. [PMID: 26460884 PMCID: PMC4642222 DOI: 10.1021/acs.biochem.5b00975] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Although interaction of a few G protein-coupled receptors (GPCRs) with Filamin A, a key actin cross-linking and biomechanical signal transducer protein, has been observed, a comprehensive structure-function analysis of this interaction is lacking. Through a systematic sequence-based analysis, we found that a conserved filamin binding motif is present in the cytoplasmic domains of >20% of the 824 GPCRs encoded in the human genome. Direct high-affinity interaction of filamin binding motif peptides of select GPCRs with the Ig domain of Filamin A was confirmed by nuclear magnetic resonance spectroscopy and isothermal titration calorimetric experiments. Engagement of the filamin binding motif with the Filamin A Ig domain induced the phosphorylation of filamin by protein kinase A in vitro. In transfected cells, agonist activation as well as constitutive activation of representative GPCRs dramatically elicited recruitment and phosphorylation of cellular Filamin A, a phenomenon long known to be crucial for regulating the structure and dynamics of the cytoskeleton. Our data suggest a molecular mechanism for direct GPCR-cytoskeleton coupling via filamin. Until now, GPCR signaling to the cytoskeleton was predominantly thought to be indirect, through canonical G protein-mediated signaling cascades involving GTPases, adenylyl cyclases, phospholipases, ion channels, and protein kinases. We propose that the GPCR-induced filamin phosphorylation pathway is a conserved, novel biochemical signaling paradigm.
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Affiliation(s)
- Kalyan C Tirupula
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic , Cleveland, Ohio 44195, United States
| | - Sujay S Ithychanda
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic , Cleveland, Ohio 44195, United States
| | - Maradumane L Mohan
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic , Cleveland, Ohio 44195, United States
| | - Sathyamangla V Naga Prasad
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic , Cleveland, Ohio 44195, United States
| | - Jun Qin
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic , Cleveland, Ohio 44195, United States
| | - Sadashiva S Karnik
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic , Cleveland, Ohio 44195, United States
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18
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Cipriani P, Di Benedetto P, Ruscitti P, Capece D, Zazzeroni F, Liakouli V, Pantano I, Berardicurti O, Carubbi F, Pecetti G, Turricchia S, Alesse E, Iglarz M, Giacomelli R. The Endothelial-mesenchymal Transition in Systemic Sclerosis Is Induced by Endothelin-1 and Transforming Growth Factor-β and May Be Blocked by Macitentan, a Dual Endothelin-1 Receptor Antagonist. J Rheumatol 2015; 42:1808-16. [PMID: 26276964 DOI: 10.3899/jrheum.150088] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2015] [Indexed: 02/06/2023]
Abstract
OBJECTIVE High endothelin-1 (ET-1) and transforming growth factor-β (TGF-β) levels may induce in healthy endothelial cells (EC) an endothelial-to-mesenchymal transition (EndMT). The same cytokines are associated with fibrosis development in systemic sclerosis (SSc). Although EndMT has not been definitively shown in SSc, this process, potentially induced by a stimulatory loop involving these 2 cytokines, overexpressed in this disease might contribute to fibroblast accumulation in affected tissues. Macitentan (MAC), an ET-1 receptor antagonist interfering with this loop, might prevent EndMT and fibroblast accumulation. METHODS EC, isolated from healthy controls (HC) and patients with SSc, were treated with ET-1 and TGF-β and successively analyzed for gene and protein expressions of endothelial and mesenchymal markers, and for Sma- and Mad-related (SMAD) phosphorylation. Further, in the supernatants, we evaluated ET-1 and TGF-β production by ELISA assay. In each assay we evaluated the ability of MAC to inhibit both the TGF-β and ET-1 effects. RESULTS We showed that both TGF-β and ET-1 treatments induced an activation of the EndMT process in SSc-EC as reported in HC cells. The ELISA assays showed a mutual TGF-β and ET-1 induction in both SSc-EC and HC-EC. A statistically significant increase of SMAD phosphorylation after treatment was observed in SSc-EC. In each assay, MAC inhibited both TGF-β and ET-1 effects. CONCLUSION Our work is the first demonstration in literature that SSc-EC, under the synergistic effect of TGF-β and ET-1, may transdifferentiate toward myofibroblasts, thus contributing to fibroblast accumulation. MAC, interfering with this process in vitro, may offer a new potential therapeutic strategy against fibrosis.
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Affiliation(s)
- Paola Cipriani
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila.
| | - Paola Di Benedetto
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Piero Ruscitti
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Daria Capece
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Francesca Zazzeroni
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Vasiliki Liakouli
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Ilenia Pantano
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Onorina Berardicurti
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Francesco Carubbi
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Gianluca Pecetti
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Stefano Turricchia
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Edoardo Alesse
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Marc Iglarz
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
| | - Roberto Giacomelli
- From the Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, and the Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila, L'Aquila; Medical and Scientific Direction, Actelion Pharmaceuticals Italy, Imola, Italy; Drug Discovery Department, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland.P. Cipriani, MD, PhD; P. Di Benedetto, PhD; P. Ruscitti, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; D. Capece, PhD; F. Zazzeroni, PhD, Department of Applied Clinical Sciences and Biotechnology, General Phatology Unit, University of L'Aquila; V. Liakouli, MD, PhD; I. Pantano, MD; O. Berardicurti, MD; F. Carubbi, MD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila; G. Pecetti, MD; S. Turricchia, MD, Medical and Scientific Direction, Actelion Pharmaceuticals Italy; E. Alesse, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, General Pathology Unit, University of L'Aquila; M. Iglarz, PhD, Drug Discovery Department, Actelion Pharmaceuticals Ltd.; R. Giacomelli, MD, PhD, Department of Applied Clinical Sciences and Biotechnology, Rheumatology Unit, School of Medicine, University of L'Aquila
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Kamato D, Thach L, Bernard R, Chan V, Zheng W, Kaur H, Brimble M, Osman N, Little PJ. Structure, Function, Pharmacology, and Therapeutic Potential of the G Protein, Gα/q,11. Front Cardiovasc Med 2015; 2:14. [PMID: 26664886 PMCID: PMC4671355 DOI: 10.3389/fcvm.2015.00014] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 03/11/2015] [Indexed: 11/19/2022] Open
Abstract
G protein coupled receptors (GPCRs) are one of the major classes of cell surface receptors and are associated with a group of G proteins consisting of three subunits termed alpha, beta, and gamma. G proteins are classified into four families according to their α subunit; Gαi, Gαs, Gα12/13, and Gαq. There are several downstream pathways of Gαq of which the best known is upon activation via guanosine triphosphate (GTP), Gαq activates phospholipase Cβ, hydrolyzing phosphatidylinositol 4,5-biphosphate into diacylglycerol and inositol triphosphate and activating protein kinase C and increasing calcium efflux from the endoplasmic reticulum. Although G proteins, in particular, the Gαq/11 are central elements in GPCR signaling, their actual roles have not yet been thoroughly investigated. The lack of research of the role on Gαq/11 in cell biology is partially due to the obscure nature of the available pharmacological agents. YM-254890 is the most useful Gαq-selective inhibitor with antiplatelet, antithrombotic, and thrombolytic effects. YM-254890 inhibits Gαq signaling pathways by preventing the exchange of guanosine diphosphate for GTP. UBO-QIC is a structurally similar compound to YM-254890, which can inhibit platelet aggregation and cause vasorelaxation in rats. Many agents are available for the study of signaling downstream of Gαq/11. The role of G proteins could potentially represent a novel therapeutic target. This review will explore the range of pharmacological and molecular tools available for the study of the role of Gαq/11 in GPCR signaling.
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Affiliation(s)
- Danielle Kamato
- Discipline of Pharmacy, Diabetes Complications Group, School of Medical Sciences, Health Innovations Research Institute, RMIT University , Bundoora, VIC , Australia
| | - Lyna Thach
- Discipline of Pharmacy, Diabetes Complications Group, School of Medical Sciences, Health Innovations Research Institute, RMIT University , Bundoora, VIC , Australia
| | - Rebekah Bernard
- Discipline of Pharmacy, Diabetes Complications Group, School of Medical Sciences, Health Innovations Research Institute, RMIT University , Bundoora, VIC , Australia
| | - Vincent Chan
- Discipline of Pharmacy, Diabetes Complications Group, School of Medical Sciences, Health Innovations Research Institute, RMIT University , Bundoora, VIC , Australia
| | - Wenhua Zheng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Centre , Guangzhou , China ; Faculty of Health Sciences, University of Macau , Macau , China
| | - Harveen Kaur
- Department of Chemistry, University of Auckland , Auckland , New Zealand
| | - Margaret Brimble
- Department of Chemistry, University of Auckland , Auckland , New Zealand
| | - Narin Osman
- Discipline of Pharmacy, Diabetes Complications Group, School of Medical Sciences, Health Innovations Research Institute, RMIT University , Bundoora, VIC , Australia
| | - Peter J Little
- Discipline of Pharmacy, Diabetes Complications Group, School of Medical Sciences, Health Innovations Research Institute, RMIT University , Bundoora, VIC , Australia
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Kamato D, Rostam MA, Bernard R, Piva TJ, Mantri N, Guidone D, Zheng W, Osman N, Little PJ. The expansion of GPCR transactivation-dependent signalling to include serine/threonine kinase receptors represents a new cell signalling frontier. Cell Mol Life Sci 2015; 72:799-808. [PMID: 25384733 PMCID: PMC11113717 DOI: 10.1007/s00018-014-1775-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2014] [Revised: 10/14/2014] [Accepted: 11/03/2014] [Indexed: 01/19/2023]
Abstract
G protein-coupled receptor (GPCR) signalling is mediated through transactivation-independent signalling pathways or the transactivation of protein tyrosine kinase receptors and the recently reported activation of the serine/threonine kinase receptors, most notably the transforming growth factor-β receptor family. Since the original observation of GPCR transactivation of protein tyrosine kinase receptors, there has been considerable work on the mechanism of transactivation and several pathways are prominent. These pathways include the "triple membrane bypass" pathway and the generation of reactive oxygen species. The recent recognition of GPCR transactivation of serine/threonine kinase receptors enormously broadens the GPCR signalling paradigm. It may be predicted that the transactivation of serine/threonine kinase receptors would have mechanistic similarities with transactivation of tyrosine kinase pathways; however, initial studies suggest that these two transactivation pathways are mechanistically distinct. Important questions are the relative importance of tyrosine and serine/threonine transactivation pathways, the contribution of transactivation to overall GPCR signalling, mechanisms of transactivation and the range of cell types in which this phenomenon occurs. The ultimate significance of transactivation-dependent signalling remains to be defined but it appears to be prominent and if so will represent a new cell signalling frontier.
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Affiliation(s)
- Danielle Kamato
- Diabetes Complications Laboratory, Discipline of Pharmacy, School of Medical Sciences and Diabetes Complications Group, RMIT University, Bundoora, VIC 3083 Australia
| | - Muhamad Ashraf Rostam
- Diabetes Complications Laboratory, Discipline of Pharmacy, School of Medical Sciences and Diabetes Complications Group, RMIT University, Bundoora, VIC 3083 Australia
| | - Rebekah Bernard
- Diabetes Complications Laboratory, Discipline of Pharmacy, School of Medical Sciences and Diabetes Complications Group, RMIT University, Bundoora, VIC 3083 Australia
| | - Terrence J. Piva
- Discipline of Cell Biology and Anatomy, School of Medical Sciences and Health Innovations Research Institute, Bundoora, VIC 3083 Australia
| | - Nitin Mantri
- School of Applied Sciences, RMIT University, Bundoora, VIC 3083 Australia
| | - Daniel Guidone
- Diabetes Complications Laboratory, Discipline of Pharmacy, School of Medical Sciences and Diabetes Complications Group, RMIT University, Bundoora, VIC 3083 Australia
| | - Wenhua Zheng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Centre and School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Narin Osman
- Diabetes Complications Laboratory, Discipline of Pharmacy, School of Medical Sciences and Diabetes Complications Group, RMIT University, Bundoora, VIC 3083 Australia
- Department of Medicine, Nursing and Health Sciences and Immunology, Monash University School of Medicine (Central and Eastern Clinical School, Alfred Health), Prahran, VIC 3004 Australia
| | - Peter J. Little
- Diabetes Complications Laboratory, Discipline of Pharmacy, School of Medical Sciences and Diabetes Complications Group, RMIT University, Bundoora, VIC 3083 Australia
- Department of Medicine, Nursing and Health Sciences and Immunology, Monash University School of Medicine (Central and Eastern Clinical School, Alfred Health), Prahran, VIC 3004 Australia
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Cattaneo F, Guerra G, Parisi M, De Marinis M, Tafuri D, Cinelli M, Ammendola R. Cell-surface receptors transactivation mediated by g protein-coupled receptors. Int J Mol Sci 2014; 15:19700-28. [PMID: 25356505 PMCID: PMC4264134 DOI: 10.3390/ijms151119700] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 09/30/2014] [Accepted: 10/13/2014] [Indexed: 12/17/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are seven transmembrane-spanning proteins belonging to a large family of cell-surface receptors involved in many intracellular signaling cascades. Despite GPCRs lack intrinsic tyrosine kinase activity, tyrosine phosphorylation of a tyrosine kinase receptor (RTK) occurs in response to binding of specific agonists of several such receptors, triggering intracellular mitogenic cascades. This suggests that the notion that GPCRs are associated with the regulation of post-mitotic cell functions is no longer believable. Crosstalk between GPCR and RTK may occur by different molecular mechanism such as the activation of metalloproteases, which can induce the metalloprotease-dependent release of RTK ligands, or in a ligand-independent manner involving membrane associated non-receptor tyrosine kinases, such as c-Src. Reactive oxygen species (ROS) are also implicated as signaling intermediates in RTKs transactivation. Intracellular concentration of ROS increases transiently in cells stimulated with GPCR agonists and their deliberated and regulated generation is mainly catalyzed by enzymes that belong to nicotinamide adenine dinucleotide phosphate (NADPH) oxidase family. Oxidation and/or reduction of cysteine sulfhydryl groups of phosphatases tightly controls the activity of RTKs and ROS-mediated inhibition of cellular phosphatases results in an equilibrium shift from the non-phosphorylated to the phosphorylated state of RTKs. Many GPCR agonists activate phospholipase C, which catalyze the hydrolysis of phosphatidylinositol 4,5-bis-phosphate to produce inositol 1,4,5-triphosphate and diacylglicerol. The consequent mobilization of Ca2+ from endoplasmic reticulum leads to the activation of protein kinase C (PKC) isoforms. PKCα mediates feedback inhibition of RTK transactivation during GPCR stimulation. Recent data have expanded the coverage of transactivation to include Serine/Threonine kinase receptors and Toll-like receptors. Herein, we discuss the main mechanisms of GPCR-mediated cell-surface receptors transactivation and the pathways involved in intracellular responses induced by GPCR agonists. These studies may suggest the design of novel strategies for therapeutic interventions.
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Affiliation(s)
- Fabio Cattaneo
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, Naples 80131, Italy.
| | - Germano Guerra
- Department of Medicine and Health Sciences, University of Molise, Campobasso 86100, Italy.
| | - Melania Parisi
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, Naples 80131, Italy.
| | - Marta De Marinis
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, Naples 80131, Italy.
| | - Domenico Tafuri
- Department of Sport Science and Wellness, University of Naples Parthenope, Naples 80133, Italy.
| | - Mariapia Cinelli
- Department of Public Health, School of Medicine, University of Naples Federico II, Naples 80131, Italy.
| | - Rosario Ammendola
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, Naples 80131, Italy.
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Gieseler F, Ungefroren H, Settmacher U, Hollenberg MD, Kaufmann R. Proteinase-activated receptors (PARs) - focus on receptor-receptor-interactions and their physiological and pathophysiological impact. Cell Commun Signal 2013; 11:86. [PMID: 24215724 PMCID: PMC3842752 DOI: 10.1186/1478-811x-11-86] [Citation(s) in RCA: 138] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 10/25/2013] [Indexed: 02/07/2023] Open
Abstract
Proteinase-activated receptors (PARs) are a subfamily of G protein-coupled receptors (GPCRs) with four members, PAR1, PAR2, PAR3 and PAR4, playing critical functions in hemostasis, thrombosis, embryonic development, wound healing, inflammation and cancer progression. PARs are characterized by a unique activation mechanism involving receptor cleavage by different proteinases at specific sites within the extracellular amino-terminus and the exposure of amino-terminal “tethered ligand“ domains that bind to and activate the cleaved receptors. After activation, the PAR family members are able to stimulate complex intracellular signalling networks via classical G protein-mediated pathways and beta-arrestin signalling. In addition, different receptor crosstalk mechanisms critically contribute to a high diversity of PAR signal transduction and receptor-trafficking processes that result in multiple physiological effects. In this review, we summarize current information about PAR-initiated physical and functional receptor interactions and their physiological and pathological roles. We focus especially on PAR homo- and heterodimerization, transactivation of receptor tyrosine kinases (RTKs) and receptor serine/threonine kinases (RSTKs), communication with other GPCRs, toll-like receptors and NOD-like receptors, ion channel receptors, and on PAR association with cargo receptors. In addition, we discuss the suitability of these receptor interaction mechanisms as targets for modulating PAR signalling in disease.
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Affiliation(s)
| | | | | | | | - Roland Kaufmann
- Department of General, Visceral and Vascular Surgery, Experimental Transplantation Surgery, Jena University Hospital, Drackendorfer Str, 1, D-07747, Jena, Germany.
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