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EFFECT OF CONTINUOUS LIGHT ON DAILY LEVELS OF PLASMA MELATONIN AND CORTISOL AND EXPRESSION OF CLOCK GENES IN PINEAL GLAND, BRAIN, AND LIVER IN ATLANTIC SALMON POSTSMOLTS
Continuous Light Changes Daily Melatonin, Cortisol, and Internal Clock Gene Patterns in the Pineal Gland, Brain, and Liver of Atlantic Salmon After Smoltification
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Abstract
Daily variations in clock gene expression were observed in Atlantic salmon postsmolts under a 12-hour light:12-hour dark regime.
- Clock mRNAs displayed daily variations in the pineal gland, brain, and liver under light-dark conditions.
- Melatonin levels in plasma also fluctuated daily under the 12-hour light:12-hour dark regime.
- Under continuous light, clock and nuclear transcription factor mRNAs did not show daily variation, except for pineal pdia3.
- Continuous light altered melatonin and cortisol levels, increasing certain mRNAs in the pineal gland while decreasing others in the liver.
- The expression of clock genes may be influenced by light across different organs, suggesting a potential relationship with nuclear transcription factors.
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