Histone deacetylase 3–Heat shock protein 90 alpha–Peroxisome proliferator-activated receptor gamma coactivator 1-alpha mitochondrial regulatory axis (HDAC3–HSP90AA1–PGC-1α axis)

The HDAC3–HSP90AA1–PGC-1α mitochondrial regulatory axis is a specialized protein complex that coordinates mitochondrial biogenesis and metabolic adaptation in response to cellular stress. Histone Deacetylase 3 (HDAC3) serves as a key enzymatic component that deacetylates the transcriptional coactivator PGC-1α, typically leading to its inactivation and subsequent reduction in mitochondrial gene expression (UniProt O15379, Q9UBK2). This interaction is stabilized and regulated by the molecular chaperone Heat Shock Protein 90 Alpha (HSP90AA1), which ensures the proper folding and assembly of the regulatory complex (UniProt P07900). In pathological conditions such as diabetic cardiomyopathy and nonalcoholic fatty liver disease, this axis is often overactive or dysregulated, resulting in profound mitochondrial dysfunction and impaired energy metabolism (PubMed: 31235512). Pharmacological intervention using selective HDAC3 inhibitors, such as RGFP966, has been shown to disrupt this negative regulation, thereby increasing PGC-1α activity and restoring mitochondrial health (PubMed: 28467923). Consequently, this axis represents a promising therapeutic target for treating metabolic and degenerative diseases characterized by mitochondrial failure.

Other names

HDAC3-HSP90-PGC1a pathwayHDAC3-HSP90AA1-PPARGC1A axisHDAC3-mediated PGC-1α regulatory complex

Inhibition of HDAC3 within the axis prevents the deacetylation of PGC-1α, thereby increasing its transcriptional activity and promoting the expression of nuclear-encoded mitochondrial genes. HSP90 modulators may further influence the stability of this regulatory complex.