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Related Experiment Videos

Hormonal response to stress in the squirrel monkey (Saimiri sciureus).

C L Coe, S P Mendoza, J M Davidson

    Neuroendocrinology
    |January 1, 1978
    PubMed
    Summary

    Squirrel monkeys exhibit unique stress responses, with higher basal steroid levels and a biphasic hormonal pattern after stress. Males show distinct differences in cortisol, ACTH, and testosterone compared to females.

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    Area of Science:

    • Endocrinology
    • Comparative Physiology
    • Primate Research

    Background:

    • The stress response involves the pituitary-adrenal and gonadal axes.
    • Understanding these responses in non-human primates is crucial for comparative biology.
    • Squirrel monkeys are a relevant model for studying primate stress physiology.

    Purpose of the Study:

    • To evaluate the pituitary-adrenal and gonadal responses to stress in squirrel monkeys.
    • To compare endocrine stress responses between male and female squirrel monkeys.

    Main Methods:

    • Plasma levels of cortisol (CS), ACTH, and testosterone (T) were measured.
    • Hormone levels were determined over a 4-hour period post-stress.
    • Stress was induced by capture and ether anesthesia.

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    Main Results:

    • Squirrel monkeys possess higher basal steroid levels than many mammals.
    • The endocrine response to stress was biphasic: initial rise followed by a decline.
    • Males had significantly higher plasma cortisol and testosterone, and lower ACTH than females.

    Conclusions:

    • Squirrel monkeys display a distinct endocrine stress response profile.
    • Sex-based differences in hormonal regulation under stress are evident in this species.
    • These findings contribute to the understanding of primate stress endocrinology.