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BMC Medicine
Published in: BMC Medicine 1/2012

Open Access 01-12-2012 | Research article

Obesity and prostate cancer: gene expression signature of human periprostatic adipose tissue

Authors: Ricardo Ribeiro, Cátia Monteiro, Victoria Catalán, Pingzhao Hu, Virgínia Cunha, Amaia Rodríguez, Javier Gómez-Ambrosi, Avelino Fraga, Paulo Príncipe, Carlos Lobato, Francisco Lobo, António Morais, Vitor Silva, José Sanches-Magalhães, Jorge Oliveira, Francisco Pina, Carlos Lopes, Rui Medeiros, Gema Frühbeck

Published in: BMC Medicine | Issue 1/2012

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Abstract

Background

Periprostatic (PP) adipose tissue surrounds the prostate, an organ with a high predisposition to become malignant. Frequently, growing prostatic tumor cells extend beyond the prostatic organ towards this fat depot. This study aimed to determine the genome-wide expression of genes in PP adipose tissue in obesity/overweight (OB/OW) and prostate cancer patients.

Methods

Differentially expressed genes in human PP adipose tissue were identified using microarrays. Analyses were conducted according to the donors' body mass index characteristics (OB/OW versus lean) and prostate disease (extra prostatic cancer versus organ confined prostate cancer versus benign prostatic hyperplasia). Selected genes with altered expression were validated by real-time PCR. Ingenuity Pathway Analysis (IPA) was used to investigate gene ontology, canonical pathways and functional networks.

Results

In the PP adipose tissue of OB/OW subjects, we found altered expression of genes encoding molecules involved in adipogenic/anti-lipolytic, proliferative/anti-apoptotic, and mild immunoinflammatory processes (for example, FADS1, down-regulated, and LEP and ANGPT1, both up-regulated). Conversely, in the PP adipose tissue of subjects with prostate cancer, altered genes were related to adipose tissue cellular activity (increased cell proliferation/differentiation, cell cycle activation and anti-apoptosis), whereas a downward impact on immunity and inflammation was also observed, mostly related to the complement (down-regulation of CFH). Interestingly, we found that the microRNA MIRLET7A2 was overexpressed in the PP adipose tissue of prostate cancer patients.

Conclusions

Obesity and excess adiposity modified the expression of PP adipose tissue genes to ultimately foster fat mass growth. In patients with prostate cancer the expression profile of PP adipose tissue accounted for hypercellularity and reduced immunosurveillance. Both findings may be liable to promote a favorable environment for prostate cancer progression.
Appendix
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Metadata
Title
Obesity and prostate cancer: gene expression signature of human periprostatic adipose tissue
Authors
Ricardo Ribeiro
Cátia Monteiro
Victoria Catalán
Pingzhao Hu
Virgínia Cunha
Amaia Rodríguez
Javier Gómez-Ambrosi
Avelino Fraga
Paulo Príncipe
Carlos Lobato
Francisco Lobo
António Morais
Vitor Silva
José Sanches-Magalhães
Jorge Oliveira
Francisco Pina
Carlos Lopes
Rui Medeiros
Gema Frühbeck
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Medicine / Issue 1/2012
Electronic ISSN: 1741-7015
DOI
https://doi.org/10.1186/1741-7015-10-108

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