NYU Researchers Identify Genetic Split-Signal Protein That Expands Brown Fat Infrastructure to Combat Obesity

NYU scientists discover how the SLIT3 protein expands nerves and blood vessels in brown fat, offering a new heat-based strategy to treat obesity and diabetes.

By: AXL Media

Published: Mar 25, 2026, 6:54 AM EDT

Source: Information for this report was sourced from New York University

The Biological Function of Metabolic Sinks

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While the majority of human adipose tissue consists of white fat designed for energy storage, brown fat serves as a specialized thermogenic organ that converts nutrients directly into heat. According to Assistant Professor Farnaz Shamsi, this tissue acts as a metabolic sink, drawing in glucose and lipids to maintain body temperature through a process known as thermogenesis. Unlike white fat, which expands to store excess calories, active brown fat dissipates chemical energy, preventing it from being deposited as permanent body mass. The study underscores that the mere presence of brown fat is insufficient for weight loss, as the tissue requires a highly specific internal architecture to function at peak capacity.

The Discovery of the SLIT3 Split-Signal

The research team identified a protein secreted by brown fat cells called SLIT3, which serves as a primary communication tool for tissue development. Through single-cell RNA sequencing, the lab discovered that an enzyme known as BMP1 cleaves the SLIT3 protein into two distinct fragments. According to the researchers, this creates an elegant "split-signal" mechanism where each fragment carries out a separate but synchronized task. This evolutionary design ensures that the expansion of the tissue's infrastructure is tightly coordinated, allowing the fat cells to signal for reinforcements exactly when and where they are needed to support heat production.

Developing the Neural and Vascular Infrastructure