TY - JOUR
T1 - H19-Dependent Transcriptional Regulation of beta 3 and beta 4 Integrins Upon Estrogen and Hypoxia Favors Metastatic Potential in Prostate Cancer
AU - Bacci, Lorenza
AU - Ripoli, Cristian
AU - Pierconti, Francesco
AU - Pinto, Francesco
AU - Bassi, Pierfrancesco
AU - Grassi, Claudio
AU - Pontecorvi, Alfredo
AU - Nanni, Simona
PY - 2019
Y1 - 2019
N2 - Estrogen and hypoxia promote an aggressive phenotype in prostate cancer (PCa), driving transcription of progression-associated genes. Here, we molecularly dissect the contribution of long non-coding RNA H19 to PCa metastatic potential under combined stimuli, a topic largely uncovered. The effects of estrogen and hypoxia on H19 and cell adhesion molecules' expression were investigated in PCa cells and PCa-derived organotypic slice cultures (OSCs) by qPCR and Western blot. The molecular mechanism was addressed by chromatin immunoprecipitations, overexpression, and silencing assays. PCa cells' metastatic potential was analyzed by in vitro cell-cell adhesion, motility test, and trans-well invasion assay. We found that combined treatment caused a significant H19 down-regulation as compared with hypoxia. In turn, H19 acts as a transcriptional repressor of cell adhesion molecules, as revealed by up-regulation of both beta 3 and beta 4 integrins and E-cadherin upon H19 silencing or combined treatment. Importantly, H19 down-regulation and beta integrins induction were also observed in treated OSCs. Combined treatment increased both cell motility and invasion of PCa cells. Lastly, reduction of beta integrins and invasion was achieved through epigenetic modulation of H19-dependent transcription. Our study revealed that estrogen and hypoxia transcriptionally regulate, via H19, cell adhesion molecules redirecting metastatic dissemination from EMT to a beta integrin-mediated invasion.
AB - Estrogen and hypoxia promote an aggressive phenotype in prostate cancer (PCa), driving transcription of progression-associated genes. Here, we molecularly dissect the contribution of long non-coding RNA H19 to PCa metastatic potential under combined stimuli, a topic largely uncovered. The effects of estrogen and hypoxia on H19 and cell adhesion molecules' expression were investigated in PCa cells and PCa-derived organotypic slice cultures (OSCs) by qPCR and Western blot. The molecular mechanism was addressed by chromatin immunoprecipitations, overexpression, and silencing assays. PCa cells' metastatic potential was analyzed by in vitro cell-cell adhesion, motility test, and trans-well invasion assay. We found that combined treatment caused a significant H19 down-regulation as compared with hypoxia. In turn, H19 acts as a transcriptional repressor of cell adhesion molecules, as revealed by up-regulation of both beta 3 and beta 4 integrins and E-cadherin upon H19 silencing or combined treatment. Importantly, H19 down-regulation and beta integrins induction were also observed in treated OSCs. Combined treatment increased both cell motility and invasion of PCa cells. Lastly, reduction of beta integrins and invasion was achieved through epigenetic modulation of H19-dependent transcription. Our study revealed that estrogen and hypoxia transcriptionally regulate, via H19, cell adhesion molecules redirecting metastatic dissemination from EMT to a beta integrin-mediated invasion.
KW - H19
KW - biomolecular analysis
KW - epigenetic modulators
KW - estrogen
KW - hypoxia
KW - lncRNA
KW - prostate cancer
KW - targeted therapy
KW - tumor metastasis
KW - H19
KW - biomolecular analysis
KW - epigenetic modulators
KW - estrogen
KW - hypoxia
KW - lncRNA
KW - prostate cancer
KW - targeted therapy
KW - tumor metastasis
UR - http://hdl.handle.net/10807/171573
U2 - 10.3390/ijms20164012
DO - 10.3390/ijms20164012
M3 - Article
SN - 1422-0067
VL - 20
SP - 4012
EP - 4012
JO - International Journal of Molecular Sciences
JF - International Journal of Molecular Sciences
ER -