Abstract
Small Heat Shock Proteins (sHSPs) evolved early in the history of life; they are present in archaea, bacteria, and eukaryota. sHSPs belong to the superfamily of molecular chaperones: they are components of the cellular protein quality control machinery and are thought to act as the first line of defense against conditions that endanger the cellular proteome. In plants, sHSPs protect cells against abiotic stresses, providing innovative targets for sustainable agricultural production. In humans, sHSPs (also known as HSPBs) are associated with the development of several neurological diseases. Thus, manipulation of sHSP expression may represent an attractive therapeutic strategy for disease treatment. Experimental evidence demonstrates that enhancing the chaperone function of sHSPs protects against age-related protein conformation diseases, which are characterized by protein aggregation. Moreover, sHSPs can promote longevity and healthy aging in vivo. In addition, sHSPs have been implicated in the prognosis of several types of cancer. Here, sHSP upregulation, by enhancing cellular health, could promote cancer development; on the other hand, their downregulation, by sensitizing cells to external stressors and chemotherapeutics, may have beneficial outcomes. The complexity and diversity of sHSP function and properties and the need to identify their specific clients, as well as their implication in human disease, have been discussed by many of the world’s experts in the sHSP field during a dedicated workshop in Québec City, Canada, on 26–29 August 2018.
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Acknowledgements
We are grateful to the Cell Stress Society International (CSSI) for its financial support of the workshop. We thank the Fund for Scientific Research in Flanders-Belgium (FWO) for supporting the attendance at the workshop of PhD students, Elias Adriaenssens and Leen Vendredy.
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Carra, S., Alberti, S., Benesch, J.L.P. et al. Small heat shock proteins: multifaceted proteins with important implications for life. Cell Stress and Chaperones 24, 295–308 (2019). https://doi.org/10.1007/s12192-019-00979-z
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DOI: https://doi.org/10.1007/s12192-019-00979-z