Extracellular HSP90 warms up integrins for an irisin workout.

Cell Metab

Department of Urology, SUNY Upstate Medical University, Syracuse, NY 13210, USA; Upstate Cancer Center, SUNY Upstate Medical University, Syracuse, NY 13210, USA; Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, NY 13210, USA. Electronic address:

Published: July 2023

The hormone-like protein irisin is involved in browning of adipose tissue and regulation of metabolism. Recently, Mu et al. identified the extracellular chaperone heat shock protein-90 (Hsp90) as the activating factor for "opening" αVβ5 integrin receptor, allowing for high-affinity irisin binding and effective signal transduction.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10593114PMC
http://dx.doi.org/10.1016/j.cmet.2023.06.002DOI Listing

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