Heat shock protein family A member 1A (Hsp70) (Hsp70)

Heat shock protein 70 (Hsp70) is a highly conserved 70 kDa molecular chaperone that plays a central role in maintaining cellular protein homeostasis (proteostasis). It functions by assisting in the folding of nascent polypeptides, refolding misfolded proteins, and directing terminally damaged proteins toward degradation via the ubiquitin-proteasome system. In many cancers, Hsp70 is significantly overexpressed and can be translocated to the plasma membrane (mHsp70), where it contributes to tumor cell survival, metastasis, and resistance to chemotherapy and radiation. In neurodegenerative conditions, Hsp70 acts protectively by sequestering toxic protein aggregates, such as amyloid-beta and tau, to mitigate neuronal damage.\n\nInterestingly, membrane-bound Hsp70 also serves as a unique tumor-specific marker that can be recognized by the innate immune system, specifically natural killer (NK) cells, making it a target for novel immunotherapies. Pharmacological targeting of Hsp70 involves small molecule inhibitors of its ATPase domain, allosteric modulators, and monoclonal antibodies or peptides designed to engage the immune system against membrane-positive tumor cells. These strategies aim to disrupt the protective mechanisms of cancer cells or enhance the clearance of toxic aggregates in neurodegeneration.

Other names

HSPA1AHSP70-1HSP72DnaKHeat shock 70 kDa protein 1AInducible heat shock protein 70Heat shock protein family A member 1A

Inhibition of ATPase activity, allosteric modulation of the nucleotide-binding domain, disruption of protein-protein interactions with co-chaperones, inhibition of substrate binding, downregulation of protein expression, and activation of natural killer (NK) cells through membrane-bound epitopes.