GFRAL Is Widely Distributed in the Brain and Peripheral Tissues of Mice

Area of Science:

• Neuroscience
• Cell Biology
• Endocrinology

Background:

• The glial cell-derived neurotrophic factor receptor alpha-like (GFRAL) was initially reported to be exclusively expressed in the mouse brainstem's area postrema (AP) and nucleus tractus solitarii (NTS).
• This restricted expression pattern contrasted with the widespread distribution and pleiotropic effects of its ligand, growth differentiation factor 15 (GDF15).

Purpose of the Study:

• To re-evaluate and detail the expression pattern of GFRAL in mice.
• To investigate the discrepancy between the reported localized GFRAL expression and the widespread GDF15 effects.

Main Methods:

• Detailed immunohistochemical analysis of GFRAL expression in various regions of the mouse brain and peripheral tissues.

Main Results:

• GFRAL-immunoreactivity was observed in regions beyond the AP/NTS, including the prefrontal cortex, hippocampus, and nucleus arcuatus.
• GFRAL was also detected in peripheral tissues such as the liver, small intestine, fat, kidney, and muscle.
• This study provides evidence for a more widespread distribution of GFRAL than previously documented.

Conclusions:

• The widespread expression of GFRAL supports its role in mediating the diverse effects of GDF15.
• These findings may offer new insights for developing pharmacological therapies for conditions like obesity, cachexia, and eating disorders.