Abstract
Hypertensive cerebrovascular remodeling involves the enlargement of vascular smooth muscle cells (VSMCs), which activates volume-regulated Cl− channels (VRCCs). The leucine-rich repeat-containing family 8 A (LRRC8A) has been shown to be the molecular identity of VRCCs. However, its role in vascular remodeling during hypertension is unclear. In this study, we used vascular smooth muscle-specific LRRC8A knockout (CKO) mice and an angiotensin II (Ang II)-induced hypertension model. The results showed that cerebrovascular remodeling during hypertension was ameliorated in CKO mice, and extracellular matrix (ECM) deposition was reduced. Based on the RNA-sequencing analysis of aortic tissues, the level of matrix metalloproteinases (MMPs), such as MMP-9 and MMP-14, were reduced in CKO mice with hypertension, which was further verified in vivo by qPCR and immunofluorescence analysis. Knockdown of LRRC8A in VSMCs inhibited the Ang II-induced upregulation of collagen I, fibronectin, and matrix metalloproteinases (MMPs), and overexpression of LRRC8A had the opposite effect. Further experiments revealed an interaction between with-no-lysine (K)-1 (WNK1), which is a “Cl−-sensitive kinase”, and Forkhead transcription factor O3a (FOXO3a), which is a transcription factor that regulates MMP expression. Ang II induced the phosphorylation of WNK1 and downstream FOXO3a, which then increased the expression of MMP-2 and MMP-9. This process was inhibited or potentiated when LRRC8A was knocked down or overexpressed, respectively. Overall, these results demonstrate that LRRC8A knockout in vascular smooth muscle protects against cerebrovascular remodeling during hypertension by reducing ECM deposition and inhibiting the WNK1/FOXO3a/MMP signaling pathway, demonstrating that LRRC8A is a potential therapeutic target for vascular remodeling-associated diseases such as stroke.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (No. 82373866 to MM Ma, No. 81773721 to YY Guan, No. 81903598 to XF Lv, No. 82073839 to SJ Liang, No. 82360312 to KM Guo), the Natural Science Foundation of Guangdong Province (2021A1515012427 and 2022A1515012471 to MM Ma, 2021A1515010378 to XF Lv), the Science and Technology Program of Guangzhou (202201020610 to KM Guo), and Fundamental Research Funds for the Central Universities, Sun Yat-Sen University (No. 22ykqb09 to SJ Liang). We would like to thank the personnel at the Advanced Medical Technology Center, The First Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-Sen University for generous support.
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The authors have approved the final article. MMM, XFL, and YYG designed the study. MMM and TC drafted and edited the manuscript. FTL, CCH, and WYL performed most of the experiments. GYY, ZJL, ZYZ, KMG, and YBT assisted with the experimental operations. YC and ZHY assisted with the data collection and statistical analysis. SJL, RPP, and JGZ revised the manuscript.
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Lu, Ft., Huang, Cc., Lai, Wy. et al. Vascular smooth muscle-specific LRRC8A knockout ameliorates angiotensin II-induced cerebrovascular remodeling by inhibiting the WNK1/FOXO3a/MMP signaling pathway. Acta Pharmacol Sin (2024). https://doi.org/10.1038/s41401-024-01280-1
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DOI: https://doi.org/10.1038/s41401-024-01280-1