Format

Send to

Choose Destination
Curr Dev Nutr. 2017 Dec 26;2(3):nzy002. doi: 10.1093/cdn/nzy002. eCollection 2018 Mar.

Broccoli Sprouts Delay Prostate Cancer Formation and Decrease Prostate Cancer Severity with a Concurrent Decrease in HDAC3 Protein Expression in Transgenic Adenocarcinoma of the Mouse Prostate (TRAMP) Mice.

Author information

1
School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR.
2
Linus Pauling Institute, Oregon State University, Corvallis, OR.
3
Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR.
4
OHSU-PSU School of Public Health, Oregon Health & Science University, Portland, OR.
5
Department of Environmental and Molecular Toxicology, College of Agricultural Sciences, Oregon State University, Corvallis, OR.
6
Department of Dermatology, Oregon Health & Science University, Portland, OR.
7
Moore Family Center for Whole Grain Foods, Nutrition and Preventive Health, Oregon State University, Corvallis, OR.

Abstract

Background:

Cruciferous vegetables have been associated with the chemoprevention of cancer. Epigenetic regulators have been identified as important targets for prostate cancer chemoprevention. Treatment of human prostate cancer cells with sulforaphane (SFN), a chemical from broccoli and broccoli sprouts, inhibits epigenetic regulators such as histone deacetylase (HDAC) enzymes, but it is not known whether consumption of a diet high in broccoli sprouts impacts epigenetic mechanisms in an in vivo model of prostate cancer.

Objective:

In the transgenic adenocarcinoma of the mouse prostate (TRAMP) model, we tested the hypothesis that a broccoli sprout diet suppresses prostate cancer, inhibits HDAC expression, alters histone modifications, and changes the expression of genes regulated by HDACs.

Methods:

TRAMP mice were fed a 15% broccoli sprout or control AIN93G diet; tissue samples were collected at 12 and 28 wk of age.

Results:

Mice fed broccoli sprouts had detectable amounts of SFN metabolites in liver, kidney, colon, and prostate tissues. Broccoli sprouts reduced prostate cancer incidence and progression to invasive cancer by 11- and 2.4-fold at 12 and 28 wk of age, respectively. There was a significant decline in HDAC3 protein expression in the epithelial cells of prostate ventral and anterior lobes at age 12 wk. Broccoli sprout consumption also decreased histone H3 lysine 9 trimethylation in the ventral lobe (age 12 wk), and decreased histone H3 lysine 18 acetylation in all prostate lobes (age 28 wk). A decline in p16 mRNA levels, a gene regulated by HDAC3, was associated with broccoli sprout consumption, but no significant changes were noted at the protein level.

Conclusions:

Broccoli sprout intake was associated with a decline in prostate cancer occurrence and HDAC3 protein expression in the prostate, extending prior work that implicated loss of HDAC3/ corepressor interactions as a key preventive mechanism by SFN in vivo.

KEYWORDS:

TRAMP mouse model; broccoli; chemoprevention; epigenetics; histone H3 lysine 18 acetylation (H3K18ac); histone deacetylase (HDAC); prostate cancer; sulforaphane

Supplemental Content

Full text links

Icon for PubMed Central
Loading ...
Support Center