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Expressional and mutational analyses of ATG5 gene in prostate cancers
Author(s) -
KIM MIN SUNG,
SONG SANG YONG,
LEE JI YOUL,
YOO NAM JIN,
LEE SUG HYUNG
Publication year - 2011
Publication title -
apmis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.909
H-Index - 88
eISSN - 1600-0463
pISSN - 0903-4641
DOI - 10.1111/j.1600-0463.2011.02812.x
Subject(s) - prostate , gene , prostate cancer , biology , genetics , cancer research , cancer , oncology , medicine
Kim MS, Song SY, Lee JY, Yoo NJ, Lee SH. Expressional and mutational analyses of ATG5 gene in prostate cancers. APMIS 2011; 119: 802–7. Autophagy is an evolutionarily conserved mechanism that plays important roles in both cell death and cell survival. ATG5 is an essential constituent for autophagosome formation, which sequesters cytoplasmic materials before lysosomal delivery. Although both cell death and survival are important in cancer development, the role of autophagy in prostate cancer development remains unclear. The aim of this study was to see whether alterations of ATG5 protein expression and somatic mutations of the ATG5 gene are found in prostate cancers. In the present study, we analyzed ATG5 protein expression in 107 prostate carcinomas by immunohistochemistry; additionally, we assayed the presence of ATG5 somatic mutations in 45 prostate carcinomas by single‐strand conformation polymorphism. Immunostaining of ATG5 in normal prostate cells was observed in 44.9% of the cases, whereas in prostate intraepithelial neoplasm (PIN) and prostate cancer cells, ATG5 was observed in 100% and 89.7% of the cases, respectively. Cytoplasmic expression of ATG5 that might be related to autophagy was seen in PIN (100%) and cancers (83.2%), but not in normal cells (0%). ATG5 expression was not associated with any of the pathologic characteristics, including size of the cancers, age, Gleason score, and stage. As for the ATG5 gene, we found no somatic mutations in the prostate cancers. In this study, we analyzed ATG5 expression and mutation in prostate cancers, and found that ATG5 expression was altered in prostate cancers. The expression of ATG5, especially in the cytoplasm, in the prostate cancers compared with normal prostate cells suggested that overexpression of this protein may be related to autophagy and might play a role in prostate tumorigenesis.