Abstract
To investigate the involvement of stress induced phosphoprotein 1 (STIP1), heat shock protein (HSP) 70, and HSP90 in ubiquitination of connexin 43 (Cx43) in rat H9c2 cardiomyocytes. Co-immunoprecipitation was used to detect protein-protein interactions and Cx43 ubiquitination. Immunofluorescence was used for protein co-localization. The protein binding, Cx43 protein expression, and Cx43 ubiquitination were reanalyzed in H9c2 cells with modified STIP1 and/or HSP90 expression. STIP1 bound to HSP70 and HSP90, and Cx43 bound to HSP40, HSP70, and HSP90 in normal H9c2 cardiomyocytes. Overexpression of STIP1 promoted the transition of Cx43-HSP70 to Cx43-HSP90 and inhibited Cx43 ubiquitination; knockdown of STIP1 resulted in the opposite effects. Inhibition of HSP90 counteracted the inhibitory effect of STIP1 overexpression on Cx43 ubiquitination. STIP1 suppresses Cx43 ubiquitination in H9c2 cardiomyocytes by promoting the transition of Cx43-HSP70 to Cx43-HSP90.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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This study were funded by the National Natural Science Foundation (NSFC) Regional Fund Cultivation Program of Affiliated Hospital of Guizhou Medical University (No. gyfynsfc[2022]-47); the Science and Technology Fund Project of Guizhou Provincial Health and Health Commission (No. gzwkj2022-120).
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GH and AL conceived the ideas. GH and AL designed the experiments. AL; ZY; LYQ; CY and YJ performed the experiments. AL; ZY; HX; WCL; TR; PZJ; YX; LMY; WSZ; BX; WH and HTJ analyzed the data. AL; LYQ and CY provided critical materials. TR; PZJ; YX and LMY wrote the manuscript. GH supervised the study. All the authors have read and approved the final version for publication.
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An, L., Gao, H., Zhong, Y. et al. Molecular chaperones HSP40, HSP70, STIP1, and HSP90 are involved in stabilization of Cx43. Cytotechnology 75, 207–217 (2023). https://doi.org/10.1007/s10616-023-00570-6
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DOI: https://doi.org/10.1007/s10616-023-00570-6