Abstract
Stem cell therapy provides a hope to no option heart disease patient group. Stem cells work via different mechanisms of which paracrine mechanism is reported to justify most of the effects. Therefore, identifying the control arms for paracrine cocktail production is necessary to tailor stem cell functions in disease contextual manner. In this study, we describe a novel paracrine cocktail regulatory axis, in stem cells, to enhance their cardioprotective abilities. We identified that HSF1 knockout resulted in reduced cardiac regenerative abilities of mesenchymal stem cells (MSCs) while its overexpression had opposite effects. Altered exosome biognesis and their miRNA cargo enrichment were found to be underlying these altered regenerative abilities. Decreased production of exosomes by MSCs accompanied their loss of HSF1 and vice versa. Moreover, the exosomes derived from HSF1 depleted MSCs showed significantly reduced candidate miRNA expression (miR-145, miR-146, 199-3p, 199b and miR-590) compared to those obtained from HSF1 overexpressing MSCs. We further discovered that HSF1 mediates miRNAs’ enrichment into exosomes via Y binding protein 1 (YBX1) and showed, by loss and gain of function strategies, that miRNAs’ enrichment in mesenchymal stem cell derived exosomes is deregulated with altered YBX1 expression. It was finally demonstrated that absence of YBX1 in MSCs, with normal HSF1 expression, resulted in significant accumulation of candidate miRNAs into the cells. Together, our data shows that HSF1 plays a critical role in determining the regenerative potential of stem cells. HSF1 does that by affecting exosome biogenesis and miRNA cargo sorting via regulation of YBX1 gene expression.
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This research was funded by National institute of Health under RO1 grant (7RO1HL141922-04) to Dr. Sunjay Kaushal.
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SAG: Designed and performed experiments, analyzed and interpreted data, wrote manuscript original draft and final manuscript approval. PS: helped in experimentation, data analysis and collection. LC: Performed all animal surgeries. AT: Helped in mouse heart sectioning and staining. ZDG, Supervised and helped trouble shoot, manuscript editing, JB: helped in mouse colony and data maintenance, LS: Helped in heart sectioning and staining, AS: Helped in cell culture and manuscript editing, AB: Cell culture and data maintenance, VM: Manuscript editing and mouse colony maintenance, RM: Helped in data analysis and manuscript review, SS: Supervision in data analysis and manuscript revision, AI: performed the Insilco analysis part for finding of HSEs in the promoter region of YBX1. SK: SK: Supervised the experimental work and edited the manuscript for critical review. The principal investigator of the study.
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Guru, S.A., Saha, P., Chen, L. et al. HSF-1 enhances cardioprotective potential of stem cells via exosome biogenesis and their miRNA cargo enrichment. Stem Cell Rev and Rep 19, 2038–2051 (2023). https://doi.org/10.1007/s12015-023-10565-7
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DOI: https://doi.org/10.1007/s12015-023-10565-7