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Bortezomib Inhibits Hypoxia-Induced Proliferation by Suppressing Caveolin-1/SOCE/[Ca 2+ ] i Signaling Axis in Human PASMCs.
- Source :
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BioMed research international [Biomed Res Int] 2021 Apr 08; Vol. 2021, pp. 5551504. Date of Electronic Publication: 2021 Apr 08 (Print Publication: 2021). - Publication Year :
- 2021
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Abstract
- Background: Previous studies have demonstrated the ubiquitin-proteasome inhibitor bortezomib (BTZ) can effectively alleviate hypoxia-induced pulmonary hypertension (HPH) by suppressing the intracellular calcium homeostasis in pulmonary arterial smooth muscle cells (PASMCs). Further evaluation showed that the antiproliferation roles of BTZ are mainly mediated by inhibition of the intracellular calcium homeostasis. Caveolin-1 belongs to one of the key regulators of the intracellular calcium homeostasis in PASMCs, which can regulate the store-operated calcium entry (SOCE). However, the effects of BTZ on Caveolin-1 remain unclear.<br />Methods: Primarily cultured human PASMCs were used as the cell model. CCK-8 assay was performed to assess the PASMCs proliferation. Western blotting and real-time qPCR were used to detect the mRNA and protein expressions. Fura-2-based fluorescence imaging experiments were used to determine the intracellular calcium concentration ([Ca <superscript>2+</superscript> ] <subscript>i</subscript> ). The protein synthesis inhibitor cycloheximide (CHX) was utilized to determine the protein degradation process.<br />Results: Firstly, in cultured human PASMCs, treatment of BTZ for 24 or 60 hours significantly downregulates Caveolin-1 at both mRNA and protein levels. Secondly, in the presence CHX, BTZ treatment also leads to downregulated protein expression and fastened protein degradation of Caveolin-1, indicating that BTZ can promote the Caveolin-1 protein degradation, other than the BTZ on Caveolin-1 mRNA transcription. Then, BTZ significantly attenuates the hypoxia-elevated baseline [Ca <superscript>2+</superscript> ] <subscript>i</subscript> , SOCE, and cell proliferation.<br />Conclusion: We firstly observed that the ubiquitin-proteasome inhibitor BTZ can inhibit the Caveolin-1 expression at both mRNA transcription and protein degradation processes, providing new mechanistic basis of BTZ on PASMC proliferation.<br />Competing Interests: The authors declare that they have no conflicts of interest.<br /> (Copyright © 2021 Chao Wang et al.)
- Subjects :
- Caveolin 1 genetics
Cell Hypoxia drug effects
Cell Proliferation drug effects
Cells, Cultured
Chloroquine pharmacology
Homeostasis drug effects
Humans
Lysosomes drug effects
Lysosomes metabolism
Myocytes, Smooth Muscle drug effects
Proteolysis drug effects
RNA, Messenger genetics
RNA, Messenger metabolism
Bortezomib pharmacology
Calcium metabolism
Calcium Signaling drug effects
Caveolin 1 metabolism
Myocytes, Smooth Muscle metabolism
Myocytes, Smooth Muscle pathology
Pulmonary Artery pathology
Subjects
Details
- Language :
- English
- ISSN :
- 2314-6141
- Volume :
- 2021
- Database :
- MEDLINE
- Journal :
- BioMed research international
- Publication Type :
- Academic Journal
- Accession number :
- 33928148
- Full Text :
- https://doi.org/10.1155/2021/5551504