PURPOSE: RB2/p130, a member of the retinoblastoma gene family, maps to human chromosome 16q12.2, a region in which deletions have been found in several human neoplasms including breast, prostatic, and ovarian carcinoma. We sought to evaluate pRb2/p130 protein expression and function in ovarian carcinoma. EXPERIMENTAL DESIGN: pRb2/p130 expression was detected by immunohistochemical and Western blot analyses in 45 primary ovarian carcinoma samples. RESULTS: Immunohistochemical analysis revealed loss or decrease of pRb2/p130 expression in 18 cases (40%). pRb2/p130 expression was mostly nuclear and inversely correlated to the tumor grade (P < 0.05). Western blot analysis correlated with immunohistochemical expression. Reverse transcription-PCR followed by Southern blot analysis was performed on a representative set of 20 ovarian carcinomas. RB2/p130 mRNA levels were consistent with protein expression. We found a significant increase in the percentage of G(1)-phase-arrested cells in CAOV3 and A2780 ovarian carcinoma cell lines after transduction with an adenovirus carrying the RB2/p130 gene (Ad-CMV-RB2/p130). CONCLUSIONS: These data indicate that loss or decrease of pRb2/p130 expression is a frequent event in ovarian carcinoma and is regulated mostly at the transcriptional level. Moreover, pRb2/p130 overexpression is able to arrest cell growth in ovarian carcinoma cells, suggesting the putative role of pRb2/p130 as a tumor suppressor in this malignancy.
PURPOSE:RB2/p130, a member of the retinoblastoma gene family, maps to human chromosome 16q12.2, a region in which deletions have been found in several humanneoplasms including breast, prostatic, and ovarian carcinoma. We sought to evaluate pRb2/p130 protein expression and function in ovarian carcinoma. EXPERIMENTAL DESIGN:pRb2/p130 expression was detected by immunohistochemical and Western blot analyses in 45 primary ovarian carcinoma samples. RESULTS: Immunohistochemical analysis revealed loss or decrease of pRb2/p130 expression in 18 cases (40%). pRb2/p130 expression was mostly nuclear and inversely correlated to the tumor grade (P < 0.05). Western blot analysis correlated with immunohistochemical expression. Reverse transcription-PCR followed by Southern blot analysis was performed on a representative set of 20 ovarian carcinomas. RB2/p130 mRNA levels were consistent with protein expression. We found a significant increase in the percentage of G(1)-phase-arrested cells in CAOV3 and A2780 ovarian carcinoma cell lines after transduction with an adenovirus carrying the RB2/p130 gene (Ad-CMV-RB2/p130). CONCLUSIONS: These data indicate that loss or decrease of pRb2/p130 expression is a frequent event in ovarian carcinoma and is regulated mostly at the transcriptional level. Moreover, pRb2/p130 overexpression is able to arrest cell growth in ovarian carcinoma cells, suggesting the putative role of pRb2/p130 as a tumor suppressor in this malignancy.
Authors: Lucie J Bilton; Chloe Warren; Rebecca M Humphries; Shannon Kalsi; Ella Waters; Thomas Francis; Wojtek Dobrowinski; Pedro Beltran-Alvarez; Mark A Wade Journal: Cancers (Basel) Date: 2022-07-18 Impact factor: 6.575
Authors: Bryan K Li; Alexandre Vasiljevic; Christelle Dufour; Fupan Yao; Ben L B Ho; Mei Lu; Eugene I Hwang; Sridharan Gururangan; Jordan R Hansford; Maryam Fouladi; Sumihito Nobusawa; Annie Laquerriere; Marie-Bernadette Delisle; Jason Fangusaro; Fabien Forest; Helen Toledano; Palma Solano-Paez; Sarah Leary; Diane Birks; Lindsey M Hoffman; Alexandru Szathmari; Cécile Faure-Conter; Xing Fan; Daniel Catchpoole; Li Zhou; Kris Ann P Schultz; Koichi Ichimura; Guillaume Gauchotte; Nada Jabado; Chris Jones; Delphine Loussouarn; Karima Mokhtari; Audrey Rousseau; David S Ziegler; Shinya Tanaka; Scott L Pomeroy; Amar Gajjar; Vijay Ramaswamy; Cynthia Hawkins; Richard G Grundy; D Ashley Hill; Eric Bouffet; Annie Huang; Anne Jouvet Journal: Acta Neuropathol Date: 2019-12-09 Impact factor: 17.088