Vitamin A levels and growth hormone axis

Area of Science:

• Endocrinology
• Nutritional Science
• Pediatrics

Background:

• Vitamin A (VA) is crucial for growth and development, with retinoic acid as a potential active metabolite.
• Previous research indicated a link between nocturnal growth hormone (GH) secretion and VA in children with growth issues.

Purpose of the Study:

• To investigate the relationship between Vitamin A status and various growth-related parameters in prepubertal children.
• To assess the impact of VA on 24-hour integrated GH concentration (IC-GH), GH response, IGF-I, IGF-binding protein-3 (IGF-BP3), and GH-binding protein (GH-BP).

Main Methods:

• Studied 34 prepubertal children (ages 5-10) with short stature and normal BMI.
• Measured IC-GH, GH response to stimuli, IGF-I, IGF-BP3, and GH-BP.
• Assessed nutritional status, excluding major deficiencies in folic acid, vitamin B12, and lipids.

Main Results:

• A significant positive correlation was observed between VA levels and IC-GH (p < 0.05).
• A strong correlation was found between VA and IGF-BP3 (p < 0.006).
• No major nutritional deficiencies were identified in the study cohort.

Conclusions:

• Vitamin A may exert a direct influence on both integrated GH concentration and IGF-BP3 levels.
• These findings suggest a potential role for Vitamin A in regulating growth hormone dynamics and related factors in children.