Heat shock protein beta-6

Heat shock protein beta-6 (HSPB6) is a small heat shock protein that functions as a molecular chaperone, maintaining denatured proteins in a folding-competent state (UniProt: O14558). Beyond its canonical chaperone role, HSPB6 participates in diverse biological processes including regulation of smooth muscle vasorelaxation and cardiac myocyte contractility, myocardial angiogenesis, and stabilization of the regulatory protein YWHAZ.

HSPB6 is expressed across multiple tissues with particular relevance to cardiovascular function and cardioprotection following induced damage (UniProt: O14558). The protein has not been assigned to specific disease categories in UniProt's curated disease database.

In Alzheimer's disease, HSPB6 shows increased abundance in post-mortem AD brain tissue relative to age-matched controls. Analysis of human AD brain by quantitative proteomics (TMT-labeled, four subcellular fractions) revealed an upregulation of HSPB6 with a mean log₂ fold-change of +1.13 (Chaparral AD proteomics). This elevation across multiple cellular compartments suggests a potential compensatory or pathological response of the protein quality control system in AD neurodegeneration.