Epigenetic Reprogramming Mediated by Maternal Diet Rich in Omega-3 Fatty Acids Protects From Breast Cancer...

Area of Science:

• Epigenetics
• Nutritional Science
• Cancer Biology

Background:

• Diets high in omega-3 fatty acids (FA) are linked to reduced cancer risk.
• Previous studies showed canola oil (omega-3 rich) reduced breast cancer (BCa) risk in transgenic mice and their offspring.
• The current study investigates the mechanisms behind this protective effect in non-transgenic mice.

Purpose of the Study:

• To elucidate the epigenetic mechanisms by which maternal omega-3 FA-rich diets confer protection against breast cancer in offspring.
• To assess the impact of a canola oil-rich maternal diet on offspring's response to a carcinogen.

Main Methods:

• BALB/c mice were fed diets rich in omega-3 (canola oil) or omega-6 (corn oil) fatty acids.
• Genome-wide epigenetic changes (histone modifications) in offspring were analyzed.
• Offspring were exposed to the carcinogen 7,12-Dimethylbenz(a)anthracene (DMBA) to evaluate tumor development and survival.

Main Results:

• Maternal omega-3 FA diet induced genome-wide epigenetic changes, including increased H3K18 acetylation and decreased H3K4me2.
• These epigenetic modifications altered gene expression in pathways crucial for cancer prevention (p53, DNA repair, apoptosis).
• Offspring from mothers on canola oil diet exhibited delayed mortality, increased survival, reduced tumor growth, and smaller tumor size after DMBA exposure.

Conclusions:

• Maternal omega-3 rich diets can epigenetically reprogram offspring, enhancing their defense against carcinogen-induced breast cancer.
• Epigenetic potentiation, particularly in genes like BRCA, facilitates rapid transcriptional responses for cancer protection.
• Canola oil-rich maternal diets offer a promising strategy for breast cancer prevention through epigenetic mechanisms.