Abstract
Impaired endothelium-dependent vasodilation has been suggested to be a key component of coronary microvascular dysfunction (CMD). A better understanding of endothelial pathways involved in vasodilation in human arterioles may provide new insight into the mechanisms of CMD. The goal of this study is to investigate the role of TRPV4, NOX4, and their interaction in human arterioles and examine the underlying mechanisms. Arterioles were freshly isolated from adipose and heart tissues obtained from 71 patients without coronary artery disease, and vascular reactivity was studied by videomicroscopy. In human adipose arterioles (HAA), ACh-induced dilation was significantly reduced by TRPV4 inhibitor HC067047 and by NOX 1/4 inhibitor GKT137831, but GKT137831 did not further affect the dilation in the presence of TRPV4 inhibitors. GKT137831 also inhibited TRPV4 agonist GSK1016790A-induced dilation in HAA and human coronary arterioles (HCA). NOX4 transcripts and proteins were detected in endothelial cells of HAA and HCA. Using fura-2 imaging, GKT137831 significantly reduced GSK1016790A-induced Ca2+ influx in the primary culture of endothelial cells and TRPV4-WT-overexpressing human coronary artery endothelial cells (HCAEC). However, GKT137831 did not affect TRPV4-mediated Ca2+ influx in non-phosphorylatable TRPV4-S823A/S824A-overexpressing HCAEC. In addition, treatment of HCAEC with GKT137831 decreased the phosphorylation level of Ser824 in TRPV4. Finally, proximity ligation assay (PLA) revealed co-localization of NOX4 and TRPV4 proteins. In conclusion, both TRPV4 and NOX4 contribute to ACh-induced dilation in human arterioles from patients without coronary artery disease. NOX4 increases TRPV4 phosphorylation in endothelial cells, which in turn enhances TRPV4-mediated Ca2+ entry and subsequent endothelium-dependent dilation in human arterioles.
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Acknowledgements
We thank Elmbrook Memorial Hospital and Froedtert Hospital for providing human tissues for the study. We also thank Dr. James H. Doroshow (NCI, NIH)) for kindly providing NOX4 antibody and NOX4 overexpressed HEK293 cell lysate and Dr. Charles K. Thodeti (NEOMED, OH) for providing PCR primer sequence information of NOX isoforms. This work was supported by the National Heart, Lung and Blood Institute Grant RO1-HL 096647 (to D.X.Z.), a generous gift from John B. and Judith A. Gardetto to the Children’s Research Foundation (to D.A.W.), and the funding for a joint Ph.D. program from the China Scholarship Council (to Y.X, contract 201708340067)
Funding
National Heart, Lung and Blood Institute Grant RO1-HL 096647 (to D.X.Z.), a generous gift from John B. and Judith A. Gardetto to the Children’s Research Foundation (to D.A.W.), and the funding for a joint Ph.D. program from the China Scholarship Council (to Y.X, contract 201708340067).
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YX, YN, NZ, AK, AM, MZ and JF planned and performed the experiments. DWA provided the intellectual and technical advice. YX, YN, and DXZ designed the study and analyzed the data. YX wrote the manuscript. YX, YN, AK, DDG, YS, and DXZ reviewed and revised the manuscript and provided critical input throughout the study.
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All protocols were approved by the Institutional Review Board of the Medical College of Wisconsin and Froedtert Hospital on the use of human subjects in research.
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Supplemental Fig S1 Role of H2O2, NO, PGI2, and NOX4 in acetylcholine (ACh)-induced vasodilation in human adipose arterioles (HAA). a) In HAA, cell-permeable H2O2 scavenger peg-catalase (peg-CAT) (500 U/ml) reduced ACh induced vasodilation at log -7 M (n=4 vessels in each group). b) A combination of peg-CAT and TRPV4 inhibitor HC067047 (1 μM) induced a similar inhibition of ACh-induced vasodilation at log -7 - -5 M (n=4 vessels in each group). c) A combination of peg-CAT and NOX1/4- inhibitor GKT137831 (1 μM) also induced a similar inhibition of ACh-induced vasodilation at log -7 M (n=4 vessels in each group). d) In HAA, preincubation with eNOS inhibitor L-NAME (100 μM) and cyclooxygenase inhibitor indomethacin (Indo, 10 μM) significantly reduced the ACh induced vasodilation (n=6 vessels in each group). e) In the presence of L-NAME and indomethacin, NOX1/4- inhibitor GKT137831 (GKT137, 1 μM) further reduced the ACh-induced vasodilation (n=6 vessels in each group). *P < 0.05 vs control or L-NAME +Indo
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Supplemental Fig S2 Effects of NO and PGI2 in GSK1016790A-induced vasodilation in human adipose arterioles (HAA). a) In HAA, preincubation with eNOS inhibitor L-NAME (100 μmol/L) and cyclooxygenase inhibitor indomethacin (Indo, 10 μmol/L), significantly reduced GSK1016790A-induced vasodilation (n=5 vessels in each group). b) The TRPV4-selective blocker HC067047 (2 μM) significantly reduced GSK1016790A-induced vasodilation (n=5 vessels in each group). *P < 0.05 vs control
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Supplemental Fig S3 Both wild-type (WT) and mutant TRPV4 proteins are expressed on the cell surface of HEK293 cells. a) Cell surface proteins were captured by a cell surface biotinylation kit, and total protein lysates were used as control. Western blotting with anti-GFP antibody shows that TRPV4-GFP WT, S824A, S823A/S824A (S823A/4A) are expressed on the cell surface and in total lysates. β-actin as a cytosolic protein was detected only in total lysates. b) No significant difference in cell surface/total lysate ratio between WT, S824A, and S823A/S824A (S823A/4A) mutants (n=3 independent experiments)
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Supplemental Fig S4 Detection of Ser824 phosphorylation in TRPV4- wild type (WT) and mutants expressed in HEK293 cells. HEK293 cells were transfected with TRPV4-GFP wildtype (WT), S823A, or S823A/S824A (S823A/4A) mutants. TRPV4 Ser824 phosphorylation was analyzed by Western blotting with a phosphoserine motif antibody against the motif RXRXXS*/T* (pS824 antibody). After stimulation with PKC activator PMA (1 μM) for 30min, p-S824 were detected in WT and S823A groups, but not in S823A/4A group, confirming the specificity of the pS824 antibody. Total GFP was used as an internal reference (n=3 independent experiments)
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Supplemental Fig S5 NOX family gene expression in human arteries. a) GTEx V7 RNA sequencing of NOX family genes in human coronary arteries shows that NOX2 and NOX4 are the most abundant isoforms, while NOX1 expression level is low. GTEx RNA sequencing data (n=173) were downloaded from NCBI dbGaP repository, which can also be viewed from the GTEx Portal (gtexportal.org). b) A similar expression profile of NOX family genes was found in human adipose arterioles freshly isolated from patients without coronary artery disease or ≤2 risk factors (n=3). Illumina mRNA sequencing libraries were prepared and sequenced using NovaSeq 6000 by the on-campus core laboratory
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Supplemental Fig S6 Effect of PKA inhibitor PKI on GSK1016790A-induced Ca2+ influx in TRPV4 wild-type (WT)-overexpressing human coronary artery endothelial cells (HCAEC). a) In HCAEC overexpressing TRPV4-WT (control), GSK1016790A induced Ca2+ influx in a concentration-dependent manner, the arrows indicate the administration of GSK1016790A (GSK). The intracellular Ca2+ concentrations were monitored by the ratiometric calcium indicator fura-2 and the results are presented as F340/F380 ratios. b) In the same WT TRPV4-overexpressing HCAEC, GSK1016790A-induced Ca2+ response at 3 nM was inhibited by the preincubation with PKI (1 μM). c) Summary data of concentration-dependent Ca2+ responses induced by GSK1016790A in the absence and presence of PKI. * P < 0.05 vs control (n=6 independent experiments in each group)
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Supplemental Fig S7 Effect of NOX2 and NOX4 siRNA on the phosphorylation of Ser824 in TRPV4 overexpressed HCAEC. TRPV4-AN-HIS-overexpressed HCAEC were treated with siControl (siCtrl), NOX2 siRNA (siNOX2), and NOX4 siRNA (siNOX4), and immunoprecipitated with anti-HIS (serum, Sigma H1029). a) TRPV4 Ser824 phosphorylation was analyzed with a phosphoserine motif antibody against the motif RXRXXS*/T* (p-S824 antibodies, Cell Signaling #10001), and the same blot was re-probed with TRPV4 antibody (Cell Signaling #65893) to detect total cellular TRPV4 proteins. b) Immunoblot of NOX4 protein and β-actin. c) Quantitative analysis of pS824 in siRNA treated HCAEC. * P < 0.05 vs control (n=3 independent experiments in each group)
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Xie, Y., Nishijima, Y., Zinkevich, N.S. et al. NADPH oxidase 4 contributes to TRPV4-mediated endothelium-dependent vasodilation in human arterioles by regulating protein phosphorylation of TRPV4 channels. Basic Res Cardiol 117, 24 (2022). https://doi.org/10.1007/s00395-022-00932-9
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DOI: https://doi.org/10.1007/s00395-022-00932-9