Chaperonin containing TCP1 subunit 8 (CCT8)

Chaperonin containing TCP1 subunit 8 (CCT8) is a protein coding gene that encodes the θ (theta) subunit of the CCT (also known as TRiC) chaperonin complex, a large ATP-dependent molecular chaperone found in the eukaryotic cytosol. The CCT complex is composed of eight distinct subunits and is essential for the folding, assembly, and maintenance of newly synthesized and cytoskeletal proteins, especially actin and tubulin. CCT8 is functionally implicated in telomere maintenance, regulation of mTOR signaling via protein folding and assembly of mTORC complexes, and proteostasis in specific cell types like T lymphocytes. Dysregulation of CCT8 has been associated with a number of cancers and genetic diseases. In cancer, CCT8 overexpression promotes cell migration, invasion, and proliferation, partly by interacting with cytoskeletal components and facilitating their function. Expression levels of CCT8 can serve as a prognostic biomarker in tumors, where elevated levels are linked to poor prognosis. Experimental knockdown or inhibition of CCT8 (e.g., using cisplatin) decreases cytoskeletal protein levels, impairs cell motility, and increases apoptosis, indicating its pivotal role in cell survival and division. Safety concerns related to targeting CCT8 include the risk of disrupting essential cellular structures, division, and immune cell function. No approved drugs are known to target CCT8 directly for therapeutic purposes; however, modulation of CCT8 may contribute to the effects of some cytotoxic agents and is a focus of ongoing research.

Other names

T-complex protein 1 subunit thetaCCT8C21orf112CCTQKIAA0002TCP-1-thetaCctqPRED71CCT-thetaRenal carcinoma antigen NY-REN-15D21S246

Drug-induced downregulation (cisplatin reduces CCT8 protein expression, promoting apoptosis in ESCC cells)