Comparative aspects of the pineal/melatonin system of poikilothermic vertebrates

@article{Filadelfi1996ComparativeAO,
  title={Comparative aspects of the pineal/melatonin system of poikilothermic vertebrates},
  author={Ana Maria Caliman Filadelfi and A M Castrucci},
  journal={Journal of Pineal Research},
  year={1996},
  volume={20}
}
Abstract: The pineal gland of poikilothermic vertebrates originates as an evagination from the diencephalic roof between the habenular and the posterior commissures, and associates with a parapineal organ to form the so‐called pineal complex. The pinealocytes may be photosensitive, secretory or intermediate cells between both. Melatonin, the indoleamine secreted by the pineal, exhibits a circadian secretory rhythm that conveys environmental information to the organism. The peak melatonin… 
Immunocytochemical observations on pineal organ and retina of the Antarctic teleosts Pagothenia borchgrevinki and Trematomus bernacchii
TLDR
It is concluded that the pineal organs of both species, at least during the austral summer, exhibit signs of being directly photo-sensitive.
Melatonin does not affect the black pigment migration in the crab Neohelice granulata
TLDR
The results suggest that melatonin does not act as a signaling factor for pigment dispersion or aggregation in the melanophores of N-acetyl-5-methoxytryptamine granulate.
Seasonal variation in the activity of melatonin synthesis in cultivated pineal body of fresh water teleost: Zacco temmincki
TLDR
The results indicate clearly that the circadian rhythm exists in the melatonin synthesis of the pineal body in Zacco temmincki.
Regulation of Melanopsins and Per1 by α-MSH and Melatonin in Photosensitive Xenopus laevis Melanophores
TLDR
The results demonstrate that unlike what has been reported for other peripheral clocks and cultured cells, medium changes or hormones do not play a major role in synchronizing the Xenopus melanophore population.
Type II Opsins in the Eye, the Pineal Complex and the Skin of Xenopus laevis: Using Changes in Skin Pigmentation as a Readout of Visual and Circadian Activity
TLDR
New findings regarding the anatomical localization and functions of type II opsins in sensing light are analyzed and the contribution of X. laevis in revealing the neuroendocrine circuits that regulate background adaptation and circadian light variation through changes in skin pigmentation is discussed.
The expression of melanopsin and clock genes in Xenopus laevis melanophores and their modulation by melatonin
TLDR
It is suggested that the dermal melanophores of X. laevis might have some characteristics of a peripheral clock, and that melatonin modulates, to a certain extent, melanopsin and clock gene expression.
Melatonin as a Hormone: New Physiological and Clinical Insights.
TLDR
Maternal melatonin programs the fetuses' behavior and physiology to cope with the environmental light/dark cycle and season after birth, and unique ways of action turn melatonin into a biological time-domain-acting molecule.
Pharmacology of Melatonin and Its Receptors
TLDR
This chapter discusses in detail the various aspects of melatonin with its key role in the body and how this versatile hormone and its receptors work in a synchronized way to alter the pathophysiological processes of the body according to the biological clock and circadian rhythm.
Melatonina: actualidad de una hormona olvidada Melatonin: the actuality of a forgotten hormone
TLDR
Melatonin, a hormone whose importance was not recognized until relatively recently, has the possibility, to serve as a transducer between the ambient light changes and the rhythm of the cycles of various biological processes (circadian or seasonal rhythms), among other functions.
...
...

References

SHOWING 1-10 OF 159 REFERENCES
Role of pineal in the regulation of some aspects of circadian rhythmicity in the catfish, Heteropneustes fossilis (Bloch).
TLDR
It is indicated that the pineal organ in catfish is involved in the regulation of locomotor activity rhythms and in some aspects of osmoregulation and Circadian rhythms in plasma cortisol, osmolality and electrolytes, but there were no significant differences in the mesor values of plasma cortisol.
Pinopsin is a chicken pineal photoreceptive molecule
TLDR
Cloned chicken pineal cDNA encoding the photoreceptive molecule is cloned and it is confirmed that it is a pineal photosensor and named pinopsin, indicating a similarity between retinal rod cells and pinealocytes in the phototransduction pathway.
Interactions of the pineal hormone melatonin with oxygen-centered free radicals: a brief review.
  • R. Reiter
  • Biology
    Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas
  • 1993
TLDR
It is found that melatonin is a very potent hydroxyl radical scavenger and there is evidence that it may be bound in the nucleus thereby providing on-site protection to DNA.
Distribution of melatonin in mammalian tissues: The relative importance of nuclear versus cytosolic localization
TLDR
The administration of exogenous melatonin resulted in a marked increase in the nuclear melatonin content without a concomitant change in the cytosolic fraction, and its location in the nucleus suggests possible genomic actions.
Detection of estrogen receptor mRNA in trout pineal and retina: estradiol-17 beta modulates melatonin production by cultured pineal photoreceptor cells.
TLDR
The present results suggest that estradiol-17 beta receptors are expressed in the fish pineal and retina and that est radiol- 17 beta modulates melatonin secretion by cultured pineal photoreceptors.
Evidences associating pineal gland function with alterations in pigmentation
TLDR
Out from this work have come many acceptable evidences of a pineal gland influence upon pigmentation, upon the phases of colloidal state, and upon the vegetative nervous system.
Melatonin secretion in vitro from the pineal complex of the lamprey Petromyzon marinus.
TLDR
This is the first direct evidence of melatonin secretion in a lamprey, suggesting that both light and temperature can affect in vitromelatonin secretion.
...
...