A hypothalamic pathway for Augmentor α-controlled body weight regulation.

Area of Science:

• Endocrinology
• Neuroscience
• Molecular Biology

Background:

• Augmentor α (Augα) and Augmentor β (Augβ) are novel ligands for receptor tyrosine kinases Alk and Ltk.
• While oncogenic Alk mutations drive cancer, the physiological functions of Augα and Augβ remain unclear.

Purpose of the Study:

• To investigate the physiological roles of Augα and Augβ in vivo.
• To explore the connection between Alk signaling, energy homeostasis, and cancer.

Main Methods:

• Generation and analysis of mice deficient in Augα and/or Augβ.
• Metabolic phenotyping, including assessment of body weight and physical activity.
• Investigation of Augα expression and regulation in AgRP neurons and the paraventricular nucleus (PVN).

Main Results:

• Augα deficiency, alone or with Augβ deficiency, results in a lean phenotype and resistance to diet-induced obesity.
• Augα-deficient mice exhibit increased physical activity.
• Augα is expressed in and metabolically regulated by Agouti-related peptide (AgRP) neurons, influencing the paraventricular nucleus (PVN).

Conclusions:

• Augα plays a significant role in regulating body weight and energy expenditure.
• Alk signaling, through Augα and AgRP neurons, represents a conserved pathway for controlling body weight.
• This pathway's co-option in Alk-driven cancers suggests therapeutic potential for metabolic diseases and cancer.