SLIT3 fragments orchestrate neurovascular expansion and thermogenesis in brown adipose tissue.

Summary

This study demonstrates that SLIT3 is proteolytically processed into SLIT3-N and SLIT3-C fragments that independently drive angiogenesis and sympathetic innervation in brown adipose tissue. PLXNA1 functions as a receptor for SLIT3-C, and BMP1 is identified as a vertebrate SLIT protease, revealing a coordinated neurovascular program underpinning thermogenesis.

Key Findings

• SLIT3 is cleaved into SLIT3-N and SLIT3-C that independently promote angiogenesis and sympathetic innervation, respectively.
• PLXNA1 is identified as a receptor for SLIT3-C and is necessary for sympathetic innervation of brown adipose tissue.
• BMP1 is discovered as the first vertebrate SLIT protease, enabling SLIT3 fragment generation and coordinated neurovascular expansion.

Clinical Implications

Targeting SLIT3 processing, PLXNA1 signaling, or BMP1 activity could enhance brown fat neurovascular remodeling and thermogenesis, suggesting novel strategies for obesity and metabolic disease therapeutics.

Limitations

• Predominantly preclinical murine data; translational relevance to human BAT requires confirmation
• Therapeutic modulation of BMP1 or PLXNA1 may have off-target effects given broad roles in development and extracellular matrix biology

Future Directions

Validate SLIT3 fragment signaling in human BAT, assess pharmacologic modulation of BMP1/PLXNA1, and test metabolic efficacy and safety in large animal models.