In a groundbreaking study, scientists have uncovered a fascinating interplay between the gut microbiota, microRNAs (miRNAs) in the mammary gland, and their potential impact on breast cancer. The research, conducted on female mice, delves into the complex mechanisms that link the gut microbial ecosystem with distal organs and sheds light on how dietary interventions, particularly flaxseed, may hold the key to reducing breast cancer risk.

The study was published in the journal Microbiology Spectrum.
The gut microbiota, a diverse community of bacteria-dominated microorganisms residing in the digestive system, has long been recognized for its influence on overall health. However, the specific mechanisms behind its interactions with distant organs have remained elusive. This study reveals a direct correlation between the profiles of gut cecal microbiota in female mice and the expression of miRNAs in the mammary gland.
Also Read: Flaxseed supplementation significantly reduces HbA1c in patients with type 2 Diabetes
Enter flaxseed, a dietary powerhouse known for its health benefits. The study focused on the components of flaxseed, specifically lignan secoisolariciresinol diglucoside (SDG) and alpha-linolenic acid (ALA). SDG, in particular, piqued interest as it requires microbial processing in the gut to release bioactive metabolites with potential antitumor effects.
The researchers explored the modifiability of microbiota-miRNA relationships through dietary interventions, and flaxseed emerged as a promising candidate. It was found that flaxseed could modify these relationships, steering them toward an antioncogenic phenotype—an environment less conducive to cancer development.
In a study conducted on female mice, researchers found that gut cecal microbiota are related to the microRNAs (miRNAs) of the mammary gland which are involved in breast cancer-related cell proliferation and migration. Dietary flaxseed through SDG and ALA showed antitumor effects.
Interestingly, the effects were not uniform across flaxseed components. While SDG and ALA-rich oil (FSO) each had distinct impacts, neither could fully replicate the comprehensive effects observed with whole flaxseed. The study emphasizes the importance of the synergistic interactions between various components in the natural form of flaxseed, suggesting that the holistic approach is vital for maximum benefit.
Moreover, the research uncovered that flaxseed affected unique pathways related to extracellular matrix processing, further underlining its multifaceted impact on breast cancer-related processes. Through their unique way of extracellular matrix processing, FSO and SDG exhibited antioncogenic effects.
Also Read: Walnuts or flaxseeds with plant based omega 3s decrease risk of heart disease
These findings open a new chapter in breast cancer prevention. By elucidating the intricate relationships between the gut microbiota, miRNA expression, and dietary interventions like flaxseed, researchers have unveiled a novel route for reducing breast cancer risk. As we delve deeper into the connections within our bodies, the potential for targeted and effective preventive strategies becomes clearer, offering hope for a future with fewer instances of this prevalent and devastating disease.
Further reading: Cecal microbiota and mammary gland microRNA signatures are related and modifiable by dietary flaxseed with implications for breast cancer risk. https://doi.org/10.1128/spectrum.02290-23