Serum insulin-like growth factor 1 concentrations in the developing rhesus monkey

Area of Science:

• Primate endocrinology
• Developmental biology
• Comparative physiology

Background:

• Serum insulin-like growth factor 1 (IGF-1) plays a crucial role in growth and development.
• Understanding IGF-1 dynamics in non-human primates can provide insights into human physiology.
• Rhesus monkeys are a relevant model organism for studying primate development.

Purpose of the Study:

• To investigate the developmental trajectory of serum IGF-1 concentrations in rhesus monkeys.
• To compare IGF-1 levels across different age groups, sexes, and physiological states (e.g., pregnancy).
• To establish the similarity of IGF-1 patterns between rhesus monkeys and humans.

Main Methods:

• Cross-sectional and longitudinal studies were conducted on rhesus monkeys.
• Serum IGF-1 concentrations were measured.
• Data were analyzed to identify patterns related to age, sex, and body weight.

Main Results:

• Serum IGF-1 concentrations were lower in infant rhesus monkeys, with a notable increase at puberty.
• Female rhesus monkeys generally had lower IGF-1 levels than males, except during pregnancy.
• A positive correlation between IGF-1 levels and body weight was observed in males.
• Longitudinal data from six animals confirmed the age-dependent nature of IGF-1 values.

Conclusions:

• Rhesus monkeys exhibit a developmental pattern of serum IGF-1 concentrations that closely resembles that of humans.
• These findings support the use of rhesus monkeys as a model for studying human growth and endocrine development.
• Sex and pubertal status significantly influence IGF-1 levels in this primate model.