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Cold exposure down-regulates zebrafish pigmentation.

Kasem Kulkeaw1, Tohru Ishitani, Takaaki Kanemaru

  • 1Department of Hematopoietic Stem Cells, SSP Stem Cell Unit, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan.

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Cold water exposure reduces zebrafish pigmentation by decreasing melanophore numbers. This study introduces a novel cold zebrafish model for investigating pigmentation regulation under physiological stress.

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Area of Science:

  • * Comparative physiology
  • * Developmental biology
  • * Zebrafish models

Background:

  • * Vertebrates possess adaptive mechanisms to cope with physiological stress.
  • * Mechanisms regulating pigmentation in response to stress are not fully understood.
  • * Pigmentation plays crucial roles in camouflage, thermoregulation, and protection.

Purpose of the Study:

  • * To investigate the impact of cold exposure on adult zebrafish pigmentation.
  • * To elucidate the cellular and molecular mechanisms underlying stress-induced pigmentation changes.
  • * To establish a novel zebrafish model for pigmentation research.

Main Methods:

  • * Adult zebrafish were exposed to cold water (17 °C) and compared to controls (26.5 °C).
  • * Pigmentation changes were assessed visually and through microscopic analysis (regular and electron microscopy).
  • * Gene expression levels of key melanogenesis enzymes (tyrosinase, dopachrome tautomerase) were quantified.

Main Results:

  • * Cold-exposed zebrafish exhibited reduced pigmentation in their stripes compared to controls.
  • * A significant decrease in the number of melanophores was observed in cold-exposed zebrafish.
  • * Gene expression of tyrosinase and dopachrome tautomerase was down-regulated in cold-exposed fish.
  • * Melanosome aggregation remained unchanged, indicating melanophore reduction as the primary cause of hypopigmentation.

Conclusions:

  • * Cold exposure down-regulates adult zebrafish pigmentation primarily by reducing melanophore count.
  • * The cold zebrafish model provides a valuable tool for studying physiological stress effects on pigmentation.
  • * Further research can utilize this model to explore broader implications of environmental stress on pigment cells.