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Cortisol Measurement in Koala Phascolarctos cinereus Fur
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Why not both? A case study in measuring cortisol and corticosterone.

S E Westrick1,2, R T Paitz3, E K Fischer2,4

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Most vertebrates produce two glucocorticoids (GCs), cortisol and corticosterone. This study reveals that measuring both GCs is crucial for understanding stress physiology, challenging previous assumptions in amphibian research.

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Area of Science:

  • Endocrinology
  • Comparative Physiology
  • Stress Physiology

Background:

  • The hypothalamic-pituitary-adrenal axis is generally thought to produce a single dominant glucocorticoid (GC).
  • Most vertebrates produce both cortisol and corticosterone, with significant interspecies variation in levels and function.
  • Glucocorticoids regulate diverse physiological processes beyond stress response.

Purpose of the Study:

  • To challenge the assumption that a single GC dominates in vertebrates.
  • To investigate the relative abundance and patterns of cortisol and corticosterone in poison frogs.
  • To highlight the importance of measuring both GCs for a comprehensive understanding of physiology.

Main Methods:

  • Validation of non-invasive waterborne hormone measurements.
  • Analysis of plasma and waterborne samples from the dyeing poison frog (Dendrobates tinctorius).
  • Comparative analysis of GC levels across multiple poison frog species.

Main Results:

  • Dendrobates tinctorius showed higher corticosterone than cortisol in plasma and water.
  • Cortisol levels were surprisingly similar to corticosterone levels in D. tinctorius.
  • Cortisol was more abundant than corticosterone in water samples from four other poison frog species.

Conclusions:

  • Findings challenge the assumption of dominant corticosterone in amphibians.
  • Measuring both cortisol and corticosterone provides a more complete physiological picture.
  • This study emphasizes the need to consider multiple GCs in stress physiology research.