A latest scientific discovery has revealed how a key protein boosts the activation of “brown fat,” responsible for burning energy and generating heat instead of storing it, potentially paving the way for novel obesity treatments that go beyond traditional appetite suppression methods.
Published in the journal Nature Communications, the study details how this protein supports the function of brown fat by promoting the growth of blood vessels and nerves within its tissues – both vital components for efficient operation. Body fat exists as either white fat, which stores energy, or brown fat, which burns energy to produce heat, and brown fat plays a crucial role in regulating body temperature and metabolic health through a process called thermogenesis. Understanding how to activate this process could have significant implications for public health.
“Brown fat acts like an energy sink,” explained Dr. Farnaz Shamsi, the study’s lead author, “drawing in nutrients and preventing their accumulation, converting chemical energy directly into heat rather than storing it.” The effectiveness of this fat relies on a complex network of nerves connected to the brain and blood vessels that supply it with oxygen and nutrients.
Researchers found that a protein known as SLIT3, secreted by brown fat cells, plays a key regulatory role in these networks. The protein is divided by an enzyme called BMP1 into two parts, one of which promotes blood vessel growth while the other supports nerve growth within the fatty tissue. The study also identified an interaction between one of these parts and a receptor called PLXNA1, which regulates the nerve network.
Experiments conducted on mice showed that the absence of the SLIT3 protein or its associated receptor led to weakened brown fat tissue structure and a decrease in blood vessel and nerve density. This resulted in increased sensitivity to cold and impaired the animals’ ability to regulate their body temperature. To confirm relevance to humans, analyses of a large sample of fatty tissue revealed that activity of the gene responsible for producing SLIT3 was linked to tissue health, levels of inflammation, and insulin sensitivity.
The significance of this discovery lies in the opportunity to develop treatments that target the stimulation of brown fat activity to increase overall energy expenditure in the body. Scientists emphasize that the effectiveness of brown fat isn’t solely dependent on its presence, but on the integrity of its internal structure, which enables it to perform its vital thermal function.
