My SciELO
Services on Demand
Journal
Article
Indicators
Cited by SciELO
Access statistics
Related links
Cited by Google
Similars in SciELO
Similars in Google
Share
Actas Urológicas Españolas
Print version ISSN 0210-4806
Abstract
PRIETO VILLAPUN, J.C.; SOLANO HARO, R.M.; CARMENA SIERRA, M.J. and SANCHEZ-CHAPADO, M.. Importance of heterotrimeric G proteins in prostate cancer molecular biology. Actas Urol Esp [online]. 2005, vol.29, n.10, pp.948-954. ISSN 0210-4806.
Objective: To deep in the knowledge of the involvement of G-protein αs and αi subunits in human prostate cancer. Methods: Prostate tissue from 9 patients undergoing radical prostatectomy for prostate cancer and 5 controls undergoing cystoprostatectomy for bladder carcinoma. G-protein αs and αi subunits were studied for expression (mRNA by RT-PCR and protein by Western-blot), functionality (adenylyl cyclase activity, AC) and possibility of mutations (analysis with restriction enzymes and cDNA sequentiation). Results: At mRNA level, the expression of αs, αi1, αi2 y αi3 was detected in healthy and cancerous tissues. At protein level, the expression of αs y αi1,2 diminished (25% and 40%, respectively) in prostate cancer. The expression of αi3/0 also diminished, whereas that of ί subunit was not modified. Basal AC activity in adenocarcinoma membranes was 40% inferior to the control. Digestion with restriction enzymes Eag I or AlwN I did not allow to locate mutations in αs. However, digestion at αi2 level with BstU I enzyme served to observe a change of Gln205 (CAG triplet) to Pro (CCG). Conclusions: The functionality and expression of heterotrimeric G proteins are selectively modified in human prostate adenocarcinoma, occurring in addition some punctual mutation. The observed substitution of Gln205 by Pro may result in a low GTPase activity for αi2 that, therefore, is stabilized in its active form.
Keywords : Prostate cancer; G proteins; Expression; Mutations.