Heme Oxygenase 1 Impairs Glucocorticoid Receptor Activity in Prostate Cancer

Glucocorticoids are used during prostate cancer (PCa) treatment. However, they may also have the potential to drive castration resistant prostate cancer (CRPC) growth via the glucocorticoid receptor (GR). Given the association between inflammation and PCa, and the anti-inflammatory role of heme oxyg...

Full description

Saved in:
Bibliographic Details
Published in:International journal of molecular sciences 2019-02, Vol.20 (5), p.1006
Main Authors: Leonardi, Daiana B, Anselmino, Nicolás, Brandani, Javier N, Jaworski, Felipe M, Páez, Alejandra V, Mazaira, Gisela, Meiss, Roberto P, Nuñez, Myriam, Nemirovsky, Sergio I, Giudice, Jimena, Galigniana, Mario, Pecci, Adalí, Gueron, Geraldine, Vazquez, Elba, Cotignola, Javier
Format: Article
Language:English
Subjects:
Androgen receptors
Androgens
Castration
Dexamethasone
Dynactin
Dynein
Gene expression
Glucocorticoids
Heme
Hemin
Localization
Microscopy
Molecular machines
Nuclear transport
Overexpression
Oxygenase
Prostate cancer
Proteins
Regulatory sequences
Steroids
Transcription factors
Tumors
Xenografts
Xenotransplantation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Glucocorticoids are used during prostate cancer (PCa) treatment. However, they may also have the potential to drive castration resistant prostate cancer (CRPC) growth via the glucocorticoid receptor (GR). Given the association between inflammation and PCa, and the anti-inflammatory role of heme oxygenase 1 (HO-1), we aimed at identifying the molecular processes governed by the interaction between HO-1 and GR. PCa-derived cell lines were treated with Hemin, Dexamethasone (Dex), or both. We studied GR gene expression by RTqPCR, protein expression by Western Blot, transcriptional activity using reporter assays, and nuclear translocation by confocal microscopy. We also evaluated the expression of HO-1, FKBP51, and FKBP52 by Western Blot. Hemin pre-treatment reduced Dex-induced GR activity in PC3 cells. Protein levels of FKBP51, a cytoplasmic GR-binding immunophilin, were significantly increased in Hemin+Dex treated cells, possibly accounting for lower GR activity. We also evaluated these treatments in vivo using PC3 tumors growing as xenografts. We found non-significant differences in tumor growth among treatments. Immunohistochemistry analyses revealed strong nuclear GR staining in almost all groups. We did not observe HO-1 staining in tumor cells, but high HO-1 reactivity was detected in tumor infiltrating macrophages. Our results suggest an association and crossed modulation between HO-1 and GR pathways.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms20051006