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Loss of autophagy-related protein Beclin 1 may define poor prognosis in ovarian clear cell carcinomas.
Abstract The aim of the present study was to clarify the role of autophagy in cisplatin (CDDP) sensitivity in OCCCs and the role of Beclin 1 in OCCC progression. Autophagy was measured using: i) western blot analysis of LC3 and p62 and ii) microscopic observation of GFP-LC3 puncta. Autophagy was suppressed using chloroquine and Beclin 1 siRNA. Surgical specimens were examined for Beclin 1 protein expression by immunohistochemistry. The correlations between the loss of Beclin 1 expression and clinicopathological characteristics, prognosis and chemosensitivity were investigated. Inhibition of autophagy by chloroquin...
Source: International Journal of Oncology - October 6, 2015 Category: Cancer & Oncology Authors: Katagiri H, Nakayama K, Razia S, Nakamura K, Sato E, Ishibashi T, Ishikawa M, Iida K, Ishikawa N, Otsuki Y, Nakayama S, Kyo S Tags: Int J Oncol Source Type: research

151pd * arid1a role in cell cycle regulation and proliferation in mouse and human gynaecological tissues reveals potential therapeutic targets
Conclusions: A core ARID1A-driven transcriptional programme, conserved accross normal tissues and species appears to exist, centred around regulation of genes involved in the G2/M checkpoint. ARID1A loss promotes proliferation in normal tissues, providing important clues as to the mechanisms of ARID1A-driven carcinogenesis. Mitotic kinases emerge as potential therapeutic targets in ARID1A mutant tumours, an observation that is not evident from studies in cancer cell lines.Disclosure: All authors have declared no conflicts of interest.
Source: Annals of Oncology - September 24, 2014 Category: Cancer & Oncology Authors: Gounaris, I., Brenton, J. Tags: basic science Source Type: research

A functional proteogenomic analysis of endometrioid and clear cell carcinomas using reverse phase protein array and mutation analysis: protein expression is histotype-specific and loss of ARID1A/BAF250a is associated with AKT phosphorylation
Background: Ovarian cancer is now recognized as a number of distinct diseases primarily defined by histological subtype. Both clear cell ovarian carcinomas (CCC) and ovarian endometrioid carcinomas (EC) may arise from endometriosis and frequently harbor mutations in the ARID1A tumor suppressor gene. We studied the influence of histological subtype on protein expression with reverse phase protein array (RPPA) and assessed proteomic changes associated with ARID1A mutation/BAF250a expression in EC and CCC. Methods: Immunohistochemistry (IHC) for BAF250a expression was performed on 127 chemotherapy-naive ovarian carcinomas (33...
Source: BMC Cancer - February 22, 2014 Category: Cancer & Oncology Authors: Kimberly WiegandBryan HennessySamuel LeungYemin WangZhenlin JuMollianne McGahrenSteve KallogerSarah FinlaysonKatherine Stemke-HaleYiling LuFan ZhangMichael AnglesioBlake GilksGordon MillsDavid HuntsmanMark Carey Source Type: research