Background:
HSF1 belongs to heat-shock transcription factor that activate heat-shock response genes under conditions of heat or other stresses. Also, HSF1 has linked with oogenesis, spermatogenesis, and placental development. It can activate AKT and inactivate JNK and CASP3 to protect cardiomyocytes from death. And it has a role in the regulation of life span and establishs a role for SIRT1 in protein homeostasis and heat-shock response. The calculated molecular weight of HSF1 is 57 kDa, but HSF1 migrates at approximately 80 kDa that likely represent different phosphorylation states (PMID: 18434628).