Functional analysis of protein disulfide isomerase  P5 in glioblastoma cells as a novel anticancer target.

Functional analysis of protein disulfide isomerase P5 in glioblastoma cells as a novel anticancer target. Oncol Rep. 2018 Nov 15;: Authors: Horibe T, Torisawa A, Masuda Y, Kawakami K Abstract P5, which is a member of the protein disulfide isomerase family, possesses isomerase and chaperone activity in vitro; however, the physiological functions of this enzyme in cells remain unclear. To understand the important roles of P5 in cancer cells, the present study examined its expression on the surface of normal and cancer cell lines by flow cytometry using an affinity‑purified anti‑P5 antibody labeled with 6‑(fluorescein‑5‑carboxamido) hexanoic acid succinimidyl ester. P5 expression was increased on the surface of various cancer cell lines, including leukemia cells, and glioblastoma, breast, colon, ovarian and uterine cervical cancer cells, compared with normal cells. However, P5 was constantly expressed within both normal and cancer cell lysates, and its total expression levels were not significantly different between the cells. P5 knockdown in glioblastoma cells by small interfering RNA affected Bip promoter activation during cancer cell growth, and significantly inhibited cancer cell growth and migration. Immunoprecipitation using an anti‑P5 antibody in cancer and normal cells demonstrated that vimentin was bound to P5, predominantly in U251 glioblastoma cells. P5 knockdown in glioblastoma cells did not affect the protein ...
Source: Oncology Reports - Category: Cancer & Oncology Tags: Oncol Rep Source Type: research