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Pigment cell signalling for physiological color change

L E Nery1, A M Castrucci

  • 1Departamento de Fisiologia, Universidade de São Paulo, Brasil.

Comparative Biochemistry and Physiology. Part A, Physiology
|March 20, 1998
PubMed
Summary

Cellular signaling pathways for physiological color change in diverse vertebrates and invertebrates are remarkably conserved. Cyclic adenosine monophosphate (cAMP) and calcium (Ca2+) pathways mediate pigment aggregation or dispersion, with variations across species.

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Area of Science:

  • Comparative physiology
  • Cellular signaling
  • Animal coloration

Background:

  • Physiological color change is crucial for camouflage, communication, and thermoregulation in many animal species.
  • Understanding the underlying cellular mechanisms is key to comprehending these adaptations.
  • Previous research has identified various signaling molecules involved in chromatophore responses.

Purpose of the Study:

  • To review and synthesize current knowledge on cellular signaling pathways in physiological color change.
  • To compare these pathways across different vertebrate and invertebrate taxa.
  • To propose hypotheses addressing unresolved questions in chromatophore regulation.

Main Methods:

  • Literature review and synthesis of existing studies on cellular signaling in color change.

Related Experiment Videos

  • Comparative analysis of signaling pathways in chromatophores of crustaceans, teleosts, amphibians, and reptiles.
  • Identification of conserved and divergent mechanisms.

    • Main Results:

    • Transduction pathways are largely conserved within chromatophores of a single species, with exceptions like iridophores.
    • The cyclic adenosine monophosphate (cAMP)-dependent pathway is evolutionarily conserved, with increased cAMP signaling pigment dispersion and decreased cAMP signaling pigment aggregation.
    • Calcium (Ca2+)-dependent pathways differ, causing pigment aggregation in teleosts and crustaceans, but dispersion in amphibians and reptiles.

    Conclusions:

    • Signaling pathways exhibit convergence, where different agonists can elicit the same cellular response.
    • The conserved nature of cAMP pathways suggests a fundamental role in pigment cell regulation across diverse taxa.
    • Further research is needed to explain differential chromatophore morphology (punctate vs. stellate) in the absence of agonists.