Retinoic Acid: Sexually Dimorphic, Anti-Insulin and Concentration-Dependent Effects on Energy

Area of Science:

• Endocrinology and Metabolism
• Molecular Biology
• Reproductive Biology

Background:

• Retinoic acid (RA) plays crucial roles in development and homeostasis.
• Understanding RA's complex interactions with metabolic and sex hormones is essential.
• Sexually dimorphic actions of RA are increasingly recognized.

Purpose of the Study:

• To review the effects of fasting versus re-feeding on retinoic acid (RA) biosynthesis and function.
• To elucidate the sexually dimorphic actions of RA.
• To explore interactions between RA and energy-balance-regulating hormones (insulin, glucagon) and sex hormones.

Main Methods:

• Literature review and synthesis of existing research on retinoic acid.
• Analysis of studies investigating RA's role in metabolic regulation.
• Examination of research on RA's influence on reproductive hormones and functions.

Main Results:

• RA homeostasis and hormesis are key to its functions.
• RA influences adiposity, muscle function, and pancreatic islet development.
• Complex interplay exists between RA, insulin, glucagon, cortisol, and sex hormones.

Conclusions:

• Clarification of apparent contradictions in RA's role in pancreagenesis versus hormone function.
• RA exhibits complex, often opposing, interactions with estrogen and androgens.
• Further research is needed to fully understand RA's multifaceted physiological roles.