Jia, X, Yang, Q, Gao, C et al. (10 more authors) (2021) Stimulation of vascular smooth muscle cell proliferation by stiff matrix via the IKCa channel‐dependent Ca2+ signaling. Journal of Cellular Physiology, 236 (10). pp. 6897-6906. ISSN 0021-9541
Abstract
Vascular stiffening, an early and common characteristic of cardiovascular diseases (CVDs), stimulates vascular smooth muscle cell (VSMC) proliferation which reciprocally accelerates the progression of CVDs. However, the mechanisms by which extracellular matrix stiffness accompanying vascular stiffening regulates VSMC proliferation remain largely unknown. In the present study, we examined the role of the intermediate‐conductance Ca2+‐activated K+ (IKCa) channel in the matrix stiffness regulation of VSMC proliferation by growing A7r5 cells on soft and stiff polydimethylsiloxane substrates with stiffness close to these of arteries under physiological and pathological conditions, respectively. Stiff substrates stimulated cell proliferation and upregulated the expression of the IKCa channel. Stiff substrate‐induced cell proliferation was suppressed by pharmacological inhibition using TRAM34, an IKCa channel blocker, or genetic depletion of the IKCa channel. In addition, stiff substrate‐induced cell proliferation was also suppressed by reducing extracellular Ca2+ concentration using EGTA or intracellular Ca2+ concentration using BAPTA‐AM. Moreover, stiff substrate induced activation of extracellular signal‐regulated kinases (ERKs), which was inhibited by treatment with TRAM34 or BAPTA‐AM. Stiff substrate‐induced cell proliferation was suppressed by treatment with PD98059, an ERK inhibitor. Taken together, these results show that substrates with pathologically relevant stiffness upregulate the IKCa channel expression to enhance intracellular Ca2+ signaling and subsequent activation of the ERK signal pathway to drive cell proliferation. These findings provide a novel mechanism by which vascular stiffening regulates VSMC function.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2021 Wiley Periodicals LLC. This is the peer reviewed version of the following article: Jia, X, Yang, Q, Gao, C et al. (10 more authors) (2021) Stimulation of vascular smooth muscle cell proliferation by stiff matrix via the IKCa channel‐dependent Ca2+ signaling. Journal of Cellular Physiology, 236 (10). pp. 6897-6906. which has been published in final form at https://doi.org/10.1002/jcp.30349. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Ca2+; extracellular signal‐regulated kinases; intermediate‐conductance Ca2+‐activated K+ channel; matrix stiffness; vascular smooth muscle cell proliferation |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biomedical Sciences (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 30 Mar 2021 10:30 |
Last Modified: | 14 Jun 2022 14:36 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/jcp.30349 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:172635 |