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Batista C, Cruz JVR, Stipursky J, de Almeida Mendes F, Pesquero JB. Kinin B 1 receptor and TLR4 interaction in inflammatory response. Inflamm Res 2024; 73:1459-1476. [PMID: 38965133 DOI: 10.1007/s00011-024-01909-1] [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: 03/13/2024] [Revised: 05/27/2024] [Accepted: 06/19/2024] [Indexed: 07/06/2024] Open
Abstract
OBJECTIVE We aimed to broaden our understanding of a potential interaction between B1R and TLR4, considering earlier studies suggesting that lipopolysaccharide (LPS) may trigger B1R stimulation. METHODS We assessed the impact of DBK and LPS on the membrane potential of thoracic aortas from C57BL/6, B1R, or TLR4 knockout mice. Additionally, we examined the staining patterns of these receptors in the thoracic aortas of C57BL/6 and in endothelial cells (HBMEC). RESULTS DBK does not affect the resting membrane potential of aortic rings in C57BL/6 mice, but it hyperpolarizes preparations in B1KO and TLR4KO mice. The hyperpolarization mechanism in B1KO mice involves B2R, and the TLR4KO response is independent of cytoplasmic calcium influx but relies on potassium channels. Conversely, LPS hyperpolarizes thoracic aorta rings in both C57BL/6 and B1KO mice, with the response unaffected by a B1R antagonist. Interestingly, the absence of B1R alters the LPS response to potassium channels. These activities are independent of nitric oxide synthase (NOS). While exposure to DBK and LPS does not alter B1R and TLR4 mRNA expression, treatment with these agonists increases B1R staining in endothelial cells of thoracic aortic rings and modifies the staining pattern of B1R and TLR4 in endothelial cells. Proximity ligation assay suggests a interaction between the receptors. CONCLUSION Our findings provide additional support for a putative connection between B1R and TLR4 signaling. Given the involvement of these receptors and their agonists in inflammation, it suggests that drugs and therapies targeting their effects could be promising therapeutic avenues worth exploring.
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Affiliation(s)
- Carolina Batista
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rua César Pernetta, S/N, Prédio do ICB (Anexo ao Bloco F do CCS), 3º andar, sala LJ.03.01, Cidade Universitária, Rio de Janeiro, RJ, CEP: 21941-902, Brazil
- Departamento de Biofísica, Universidade Federal de São Paulo, R. Pedro de Toledo, 669, 9° andar, São Paulo, SP, CEP: 04039-032, Brazil
| | - João Victor Roza Cruz
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rua César Pernetta, S/N, Prédio do ICB (Anexo ao Bloco F do CCS), 3º andar, sala LJ.03.01, Cidade Universitária, Rio de Janeiro, RJ, CEP: 21941-902, Brazil
| | - Joice Stipursky
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rua César Pernetta, S/N, Prédio do ICB (Anexo ao Bloco F do CCS), 3º andar, sala LJ.03.01, Cidade Universitária, Rio de Janeiro, RJ, CEP: 21941-902, Brazil
| | - Fabio de Almeida Mendes
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rua César Pernetta, S/N, Prédio do ICB (Anexo ao Bloco F do CCS), 3º andar, sala LJ.03.01, Cidade Universitária, Rio de Janeiro, RJ, CEP: 21941-902, Brazil.
| | - João Bosco Pesquero
- Departamento de Biofísica, Universidade Federal de São Paulo, R. Pedro de Toledo, 669, 9° andar, São Paulo, SP, CEP: 04039-032, Brazil.
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Othman R, Cagnone G, Joyal JS, Vaucher E, Couture R. Kinins and Their Receptors as Potential Therapeutic Targets in Retinal Pathologies. Cells 2021; 10:1913. [PMID: 34440682 PMCID: PMC8391508 DOI: 10.3390/cells10081913] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/23/2021] [Accepted: 07/24/2021] [Indexed: 12/29/2022] Open
Abstract
The kallikrein-kinin system (KKS) contributes to retinal inflammation and neovascularization, notably in diabetic retinopathy (DR) and neovascular age-related macular degeneration (AMD). Bradykinin type 1 (B1R) and type 2 (B2R) receptors are G-protein-coupled receptors that sense and mediate the effects of kinins. While B2R is constitutively expressed and regulates a plethora of physiological processes, B1R is almost undetectable under physiological conditions and contributes to pathological inflammation. Several KKS components (kininogens, tissue and plasma kallikreins, and kinin receptors) are overexpressed in human and animal models of retinal diseases, and their inhibition, particularly B1R, reduces inflammation and pathological neovascularization. In this review, we provide an overview of the KKS with emphasis on kinin receptors in the healthy retina and their detrimental roles in DR and AMD. We highlight the crosstalk between the KKS and the renin-angiotensin system (RAS), which is known to be detrimental in ocular pathologies. Targeting the KKS, particularly the B1R, is a promising therapy in retinal diseases, and B1R may represent an effector of the detrimental effects of RAS (Ang II-AT1R).
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Affiliation(s)
- Rahmeh Othman
- School of Optometry, Université de Montréal, Montreal, QC H3T 1P1, Canada
- Department of Pharmacology and Physiology, Faculty of Medicine, Université de Montréal, Montreal, QC H3T 1J4, Canada
| | - Gael Cagnone
- Department of Pediatry, Faculty of Medicine, CHU St Justine, Université de Montréal, Montreal, QC H3T 1J4, Canada; (G.C.); (J.-S.J.)
| | - Jean-Sébastien Joyal
- Department of Pediatry, Faculty of Medicine, CHU St Justine, Université de Montréal, Montreal, QC H3T 1J4, Canada; (G.C.); (J.-S.J.)
| | - Elvire Vaucher
- School of Optometry, Université de Montréal, Montreal, QC H3T 1P1, Canada
| | - Réjean Couture
- Department of Pharmacology and Physiology, Faculty of Medicine, Université de Montréal, Montreal, QC H3T 1J4, Canada
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TGF-β1 induced up-regulation of B1 kinin receptor promotes antifibrotic activity in rat cardiac myofibroblasts. Mol Biol Rep 2019; 46:5197-5207. [PMID: 31309451 DOI: 10.1007/s11033-019-04977-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 07/11/2019] [Indexed: 01/14/2023]
Abstract
Cardiac myofibroblast (CMF) are non-muscle cardiac cells that play a crucial role in wound healing and in pathological remodeling. These cells are mainly derived of cardiac fibroblast (CF) differentiation mediated by TGF-β1. Evidence suggests that bradykinin (BK) regulates cardiac fibroblast function in the heart. Both B1 and B2 kinin receptors (B1R and B2R, respectively) mediate the biological effects of kinins. We recently showed that both receptors are expressed in CMF and its stimulation decreases collagen secretion. Whether TGF-β1 regulates B1R and B2R expression, and how these receptors control antifibrotic activity in CMF remains poorly understood. In this work, we sought to study, the regulation of B1R expression in cultured CMF mediated by TGF-β1, and the molecular mechanisms involved in B1R activation on CMF intracellular collagen type-I levels. Cardiac fibroblast-primary culture was obtained from neonatal rats. Hearts were digested and CFs were attached to dishes and separated from cardiomyoctes. CMF were obtained from CF differentiation with TGF-β1 5 ng/mL. CF and CMF were treated with B1R and B2R agonists and with TGF-β1 at different times and concentrations, in the presence or absence of chemical inhibitors, to evaluate signaling pathways involved in B1R expression, collagen type-I and prostacyclin levels. B1R and collagen type-I levels were evaluated by western blot. Prostacyclin levels were quantified by an ELISA kit. TGF-β1 increased B1R expression via TGFβ type I receptor kinase (ALK5) activation and its subsequent signaling pathways involving Smad2, p38, JNK and ERK1/2 activation. Moreover, in CMF, the activation of B1R and B2R by their respective agonists, reduced collagen synthesis. This effect was mediated by the canonical signaling pathway; phospholipase C (PLC), protein kinase C (PKC), phospholipase A2 (PLA2), COX-2 activation and PGI2 secretion and its autocrine effect. TGF-β1 through ALK5, Smad2, p38, JNK and ERK1/2 increases B1R expression; whereas in CMF, B1R and B2R activation share common signaling pathways for reducing collagen synthesis.
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Othman R, Vaucher E, Couture R. Bradykinin Type 1 Receptor - Inducible Nitric Oxide Synthase: A New Axis Implicated in Diabetic Retinopathy. Front Pharmacol 2019; 10:300. [PMID: 30983997 PMCID: PMC6449803 DOI: 10.3389/fphar.2019.00300] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 03/11/2019] [Indexed: 12/15/2022] Open
Abstract
Compelling evidence suggests a role for the inducible nitric oxide synthase, iNOS, and the bradykinin type 1 receptor (B1R) in diabetic retinopathy, including a possible control of the expression and activity of iNOS by B1R. In diabetic retina, both iNOS and B1R contribute to inflammation, oxidative stress, and vascular dysfunction. The present study investigated whether inhibition of iNOS has any impact on inflammatory/oxidative stress markers and on the B1R-iNOS expression, distribution, and action in a model of type I diabetes. Diabetes was induced in 6-week-old Wistar rats by streptozotocin (65 mg.kg-1, i.p.). The selective iNOS inhibitor 1400W (150 μg.10 μl-1) was administered twice a day by eye-drops during the second week of diabetes. The retinae were collected 2 weeks after diabetes induction to assess the protein and gene expression of markers by Western blot and qRT-PCR, the distribution of iNOS and B1R by fluorescence immunocytochemistry, and the vascular permeability by the Evans Blue dye technique. Diabetic retinae showed enhanced expression of iNOS, B1R, carboxypeptidase M (involved in the biosynthesis of B1R agonists), IL-1β, TNF-α, vascular endothelium growth factor A (VEGF-A) and its receptor, VEGF-R2, nitrosylated proteins and increased vascular permeability. All those changes were reversed by treatment with 1400W. Moreover, the additional increase in vascular permeability in diabetic retina induced by intravitreal injection of R-838, a B1R agonist, was also prevented by 1400W. Immunofluorescence staining highlighted strong colocalization of iNOS and B1R in several layers of the diabetic retina, which was prevented by 1400W. This study suggests a critical role for iNOS and B1R in the early stage of diabetic retinopathy. B1R and iNOS appear to partake in a mutual auto-induction and amplification loop to enhance nitrogen species formation and inflammation in diabetic retina. Hence, B1R-iNOS axis deserves closer scrutiny in targeting diabetic retinopathy.
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Affiliation(s)
- Rahmeh Othman
- School of Optometry, University of Montreal, Montreal, QC, Canada.,Department of Pharmacology and Physiology, University of Montreal, Montreal, QC, Canada
| | - Elvire Vaucher
- School of Optometry, University of Montreal, Montreal, QC, Canada
| | - Réjean Couture
- Department of Pharmacology and Physiology, University of Montreal, Montreal, QC, Canada
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