Vitamin A, endocrine tissues and hormones: interplay and interactions

Area of Science:

• Endocrinology
• Molecular Biology
• Nutritional Science

Background:

• Vitamin A (retinol) is essential for cell proliferation and differentiation.
• Retinoids, including retinoic acid (RA), are vital for vision, immune function, brain activity, and tissue metabolism in adults.
• This review focuses on the physiological interplay between retinoids and various endocrine tissues and hormonal systems.

Purpose of the Study:

• To review the physiological interactions of retinoids with endocrine tissues and hormonal systems.
• To explore the potential therapeutic applications of retinoids in endocrine-related conditions.
• To summarize current understanding and controversies regarding retinoid functions in endocrine health and disease.

Main Methods:

• Literature review of physiological interactions between retinoids and endocrine systems.
• Analysis of studies on retinoid targets within the pituitary, thyroid, pancreas, adrenal glands, and gonads.
• Synthesis of research on retinoid roles in endocrine dysfunction and metabolic syndrome.

Main Results:

• Retinoids target pituitary corticotrophs, suggesting therapeutic potential for corticotropinomas.
• Retinoids influence thyroid iodine metabolism; vitamin A deficiency exacerbates iodine-deficiency-related thyroid dysfunction.
• Retinoids impact pancreatic development and glucose/fat metabolism, though therapeutic use for metabolic syndrome requires further study.

Conclusions:

• Retinoids have significant physiological roles in multiple endocrine systems, particularly the pituitary and thyroid.
• While retinoids show promise in specific endocrine applications (e.g., pituitary tumors), their efficacy in others (e.g., thyroid cancer) is less certain.
• Further research is needed to fully elucidate the complex roles of retinoids in metabolic syndrome and other endocrine functions.