Regulation of Melatonin Production by Light, Darkness, and Temperature in the Trout Pineal
Overview
Physiology
Social Sciences
Affiliations
The pineal gland of the rainbow trout, Salmo gairdneri, when kept under in vitro perifusion culture conditions, displays a consistently elevated level of melatonin production in darkness (Gern and Greenhouse 1988). Upon light exposure melatonin production falls and stabilizes at a new lower level that is dependent upon the irradiance of the stimulus. To achieve the maximal response for each irradiance, the duration of the stimulus must exceed 30 min. The response amplitude is maximally sensitive to photons presented over durations of 30-45 min; is very insensitive to shorter light exposures; and is maintained with no evidence of adaptation over longer exposures. Temperature plays a role in regulation of melatonin production both in darkness and during light exposure; increased temperature increases melatonin production in darkness and also increases the sensitivity of the response to light. The action spectrum for the response is best fit by the Dartnall nomogram for a vitamin A1 based rhodopsin with peak sensitivity near 500 nm. The possible adaptive significance of control of melatonin synthesis by light and temperature is considered.
Adaptive photoperiod interpretation modulates phenological timing in Atlantic salmon.
Oldham T, Oppedal F, Fjelldal P, Hansen T Sci Rep. 2023; 13(1):2618.
PMID: 36788276 PMC: 9929253. DOI: 10.1038/s41598-023-27583-7.
Melanopsin elevates locomotor activity during the wake state of the diurnal zebrafish.
Dekens M, Fontinha B, Gallach M, Pflugler S, Tessmar-Raible K EMBO Rep. 2022; 23(5):e51528.
PMID: 35233929 PMC: 9066073. DOI: 10.15252/embr.202051528.
Chromatic clocks: Color opponency in non-image-forming visual function.
Spitschan M, Lucas R, Brown T Neurosci Biobehav Rev. 2017; 78:24-33.
PMID: 28442402 PMC: 5510539. DOI: 10.1016/j.neubiorev.2017.04.016.
Jung S, Kim N, Choi Y, Choi J, Choi Y, Heo Y Fish Physiol Biochem. 2016; 42(5):1335-46.
PMID: 27012684 DOI: 10.1007/s10695-016-0221-7.
Effect of lighting conditions on zebrafish growth and development.
Villamizar N, Vera L, Simon Foulkes N, Sanchez-Vazquez F Zebrafish. 2013; 11(2):173-81.
PMID: 24367902 PMC: 3991973. DOI: 10.1089/zeb.2013.0926.