Cited by 121Heat shock proteins researchMesenchymal stem cell researchCongenital heart defects research

Heat Shock Improves Sca-1+ Stem Cell Survival and Directs Ischemic Cardiomyocytes Toward a Prosurvival Phenotype Via Exosomal Transfer: A Critical Role for HSF1/miR-34a/HSP70 Pathway

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Feng, Yuliang, Huang, Wei, Meng, Wei, Jegga, Anil G., Wang, Yigang, Cai, Wenfeng, Kim, Ha Won, Pasha, Zeeshan +5 more·2014·Stem Cells

Abstract

Stem cell-based therapy is a promising intervention for ischemic heart diseases. However, the functional integrity of stem cells is impaired in an ischemic environment. Here, we report a novel finding that heat shock significantly improves Sca-1+stem cell survival in an ischemic environment by the regulation of the triangle: heat shock factor 1 (HSF1), HSF1/miR-34a, and heat shock protein 70 (HSP70). Initially we prove that HSP70 is the key chaperone-mediating cytoprotective effect of heat shock in Sca-1+cells and then we establish miR-34a as a direct repressor of HSP70. We found that HSP70 was downregulated in heat shocked Sca-1+ stem cells (HSSca-1+ cells). Intriguingly, we demonstrate that the downregulation of miR-34a is attributed to HSF1-mediated epigenetic repression through histone H3 Lys27 trimethylation (H3K27me3) on miR-34a promoter. Moreover, we show that heat shock induces exosomal transfer of HSF1 from Sca-1+ cells, which directs ischemic cardiomyocytes toward a prosurvival phenotype by epigenetic repression of miR-34a. In addition, our in vivo study demonstrates that transplantation of HSSca-1+ cells significantly reduces apoptosis, attenuates fibrosis, and improves global heart functions in ischemic myocardium. Hence, our study provides not only novel insights into the effects of heat shock on stem cell survival and paracrine behavior but also may have therapeutic values for stem cell therapy in ischemic heart diseases. Stem Cells 2014;32:462–472

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  • Overexpression of heat shock protein 70 protects against age- and disease-related tissue degeneration in brain, heart, and skeletal muscle.

    “Overexpression of heat shock protein 70 (HSP70), a chaperone protein that recognizes damaged proteins in CMA, also protects against age- and disease-related tissue degeneration in brain, heart and skeletal muscle90–92.”

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Authors
Feng, Y., Huang, W., Meng, W., Jegga, A. G., Wang, Y., Cai, W., Kim, H. W., Pasha, Z., Wen, Z., Rao, F., Modi, R. M., Yu, X., & Ashraf, M.
Affiliations
  • Guangdong General Hospital (CN)
  • University of Cincinnati (US)
  • Third Affiliated Hospital of Sun Yat-sen University (CN)
  • Cincinnati Children's Hospital Medical Center (US)
  • Nanchang University (CN)
  • Medical Research Center of Guangdong General Hospital, Guangdong Academy of Medical Sciences Guangdong Provincial Cardiovascular Institute, Southern Medical University, Guangzhou, China
Corresponding author
Ashraf, Muhammad
Venue
Stem Cells
Published
2014-01-13
Volume
32
Issue
2
Pages
462-472
ISSN
  • 1066-5099 (ISSN-L)
  • 1549-4918
OpenAlex
W1835157090
Cited by
121
References
26
Citations by year
2026: 3 · 2025: 4 · 2024: 7 · 2023: 4 · 2022: 11 · 2021: 13 · 2020: 10 · 2019: 9 · 2018: 15 · 2017: 17 · 2016: 8 · 2015: 13 · 2014: 7
FWCI
4.18
Type
journal article
Language
en
Open access
Locations
  • Stem Cells (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health Grants (R37-HL-074272, HL-095375, HL-087246)
  • National Natural Science Foundation of China (81120108003, 81330007)
  • National Key Basic Research Program of China (2012CB526602)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Congenital heart defects research
Keywords
heat shock, HSF1, miR-34a, HSP70, H3K27me3, epigenetic repression, stem cell survival, paracrine signaling, ischemic heart disease, stem cell therapy, cardiomyocyte apoptosis, myocardial fibrosis
MeSH terms
Heat Shock Transcription Factors, Antigens, Ly, Cell Survival, DNA-Binding Proteins, Humans, Membrane Proteins, Stem Cells, Transcription Factors, Apoptosis, HSP70 Heat-Shock Proteins, Heat-Shock Response, Myocytes, Cardiac, MicroRNAs, Exosomes

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