Heat Shock Protein 90 (HSP90) and Immune Regulation

Heat shock protein 90 (HSP90) is involved in conformational and structural maturation of signalling molecules and transcription factors in immune reaction. HSP90 inhibitors induce immune modulation via anti-inflammatory effect, regulating humoral and cellular immune responses. Therefore, HSP90 inhibitors potentially useful target for the autoimmune disease and chronic inflammatory diseases.

Down-regulated Reactive Oxygen Species by Heat Shock Protein 90 in 3-Hydroxykynurenine-induced SKN-SH Cell Death / 체질인류학회지

In this present study, we show that 3HK-induced reactive oxygen species (ROS) accumulation and caspase activation lead to apoptotic cell death. Pretreatment with N-acetylcysteine (NAC), an effective antioxidant, significantly attenuated 3HK-induced apoptosis by way of a reduction of ROS accumulation and caspase activity. SKN-SN cells were protected from 3HK-induced cytotoxicity by heat shock protein (HSP). HSP90 effectively attenuated 3HK-mediated ROS accumulation and apoptosis. In addition, the protective effect of HSP90 was abolished by pretreatment with HSP90 anti-sense oligonucleotide, but not when pretreated with anti-senses for other HSPs. These results suggest that HSP90 protects SKN-SH cells from 3HK-induced cytotoxicity by reducing ROS levels and caspase activity.