Adipokine NRG4 Identified as Key Suppressor of Obesity Driven Breast Cancer Metastasis in New Study

New research identifies the adipokine NRG4 as a potent suppressor of breast cancer spread, linking metabolic health to cancer survival.

By: AXL Media

Published: May 1, 2026, 8:25 AM EDT

Source: Information for this report was sourced from EurekAlert!

The Molecular Intersection of Adipose Health and Oncology

The physiological relationship between obesity and increased cancer risk has long been observed, yet the specific chemical messengers driving this connection are only now being fully mapped. A collaborative research effort involving Nanjing Medical University and several prominent Chinese institutes has identified neuregulin 4 (NRG4) as a vital protein secreted by white adipose tissue that naturally combats cancer cell migration. The study highlights how metabolic dysfunction, such as that found in obese subjects, leads to a marked reduction in NRG4 levels. This decline removes a natural barrier to metastatic dissemination, effectively allowing the tumor microenvironment to become more hospitable to invasive cancer cells through altered paracrine signaling.

Decoding the NRG4 and ERBB4 Signaling Axis

The protective mechanism of NRG4 is rooted in its ability to bind with and activate the receptor tyrosine kinase known as ERBB4. Upon activation, this receptor generates an intracellular domain that interacts with a protein called YAP1, preventing it from entering the cell nucleus. According to the research published in Genes & Diseases, this interaction is a crucial regulatory step in maintaining cellular stability. When NRG4 is abundant, it keeps the pro-metastatic machinery of the cell in a suppressed state, but when NRG4 levels drop due to obesity, this signaling axis collapses, leaving the cancer cells free to transition into a more mobile and aggressive form.

Halting the Machinery of Extracellular Matrix Degradation

In the absence of sufficient NRG4 signaling, the protein YAP1 translocates into the nucleus and binds to the transcription factor TEAD1. This partnership triggers the production of matrix metalloproteinases, specifically MMP9 and MMP12, which function like molecular scissors to degrade the surrounding tissue structure. This degradation is what allows tumor cells to break away from the primary mass and invade distant organs. The researchers demonstrated that by reintroducing NRG4, they could effectively downregulate these enzymes, thereby impairing the cellular machinery required for the cancer to spread through the body.