Abstract 4121: Chaperonin containing-TCP-1 protein level in breast cancer cells predicts therapeutic application of a cytotoxic peptide

• Published in: Cancer research (Chicago, Ill.) Ill.), 2016-07, Vol.76 (14_Supplement), p.4121-4121
• Main Authors: Khaled, Annette R., Khaled, Amr S., Bassiouni, Rania, Vishnubhotla, Priya
• Format: Article
• Language: English
• ISSN: 0008-5472; 1538-7445
• DOI: 10.1158/1538-7445.AM2016-4121

Metastatic disease is a principal cause of death from breast cancer. This is due in part to the development of resistance to current therapeutics and the often debilitating side effects that impair quality of life. The challenge is to therapeutically target an essential physiological function of cancer cells not found in normal, non-transformed cells. To this end, we discovered CT20p, a therapeutic peptide that causes cancer-specific death in human breast tumor cells and tumor regression in xenograft models of breast cancer. Using a proteomics approach, we found that CT20p directly binds to multiple subunits of a type II chaperonin called chaperonin containing T-complex or CCT. CCT forms a large macromolecular complex composed of 8 subunits. Inhibition of CCT by CT20p depletes the pool of native actin and tubulin (obligate clients of CCT), impairing the polymerization of cytoskeletal elements needed to support cell adhesion and motility. As a result cancer cells lose the ability to migrate and die from loss of substrate survival signals. We found that expression levels of CCT varied among different triple negative breast cancer (TNBC) cell lines, with the highest expression occurring in those of the mesenchymal stem-like (MSL) subtype with metastatic potential. Lowest levels of CCT were found in normal breast epithelial cells. Sensitivity to killing by CT20p thus correlated with levels of CCT, with cancer cells expressing high amounts of CCT being the most susceptible. Using tissue microarrays (TMAs) of breast cancer progression, we developed an immunohistochemistry staining procedure for CCT. Results were interpreted on a scale of 1 to 4 (with 4 being the strongest staining). CCT expression was statistically higher in invasive ductal carcinoma (IDC) as compared to normal and cancer adjacent tissue (CAT) (p0.05). However, no statistically significant correlations were observed with TNBC tissues, with CCT staining ranging from the strongest staining (4) to lowest (1). These results are similar to that observed with th