Endocrine Rhythms Associated with Pineal Gland Function

Reíter, Russel J.

doi:10.1007/978-1-4684-8715-2_2

Cited by 22 publications

(9 citation statements)

References 86 publications

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“…It is to be regretted that these authors did not mention the presence or the absence of granular vesicles in these cells. Thus it has not been possible to classify them strictly (see Table 1) as Reiter, 1975) and in po&et gopher (Sheridan and Reiter, 1973) (Pevet et al, 1977) granular pigment has also been described. In this animal, the pinealocytes of population !I are, moreover, characterized by the presence of an extraordinary amount of glycogen granules.…”

Section: Second Category Of Cellsmentioning

confidence: 92%

On the presence of different populations of pinealocytes in the mammalian pineal gland

Pévet

1977

J. Neural Transmission

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The different categories of cells described by many authors in the pineal gland of mammals have been critically considered. In some mammalian species, two different populations of pinealocytes have been observed. To each of these populations a specific secretory process can be attributed. One is characterized by the formation of granular vesicles originating from the Golgi apparatus, the other by the formation of material directly from the cisterns of the granular endoplasmic reticulum. Both of these secretory processes appear to be also present in the pineal of the mole, the hedgehog, and the rat, mammals in which generally only one population of pinealocytes has been described. The physiological consequences of these findings have been discussed.

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Section: Second Category Of Cellsmentioning

confidence: 92%

On the presence of different populations of pinealocytes in the mammalian pineal gland

Pévet

1977

J. Neural Transmission

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“…The pineal seems to be essential for adaptation and hence for survival under natural conditions [16]. Light sup presses melatonin formation in rats.…”

Section: Discussionmentioning

confidence: 99%

Plasma Melatonin Levels and Nocturnal Transitions between Sleep and Wakefulness

Birkeland¹

1982

Neuroendocrinology

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During night (11 p.m.–7 a.m.) blood was sampled in darkness via an indwelling intravenous catheter simultaneously with polygraphic sleep registration in 7 normal men. The nocturnal melatonin secretion patterns exhibited secretory episodes. Spontaneous waking episodes were shown to be significantly correlated to the occurrence of melatonin peaks (χ_c² = 9.0, p < 0.005 Melatonin nadirs were significantly associated with rapid eye movement periods (χ_c² = 12.8, p < 0.005) but not with other sleep stages evaluated by standard criteria. It is hypothesized that melatonin secreted in connection with arousals during night may in turn act to restore sleep in humans.

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“…The fact that it is present in the blood of immature seals in concentrations similar to those in sexually mature mammals of other species indicates either that the primary function of melatonin is not antigonadotropic, or that the mechanism for gonadal control is present in the animal long before it reaches sexual maturity. It is now clear that the pineal indole 5-methoxytryptophol is also an important antigonadotropin and that there are at least two polypeptide pineal antigonadotropins 60-1000 times more potent than melatonin (Matthews and Benson 1973;Reiter 1975b). Once the complete spectrum of pineal hormones is identified, melatonin may be found to be of minor importance in the control of gonadal function, and other substances may be more realistic indicators of pineal function.…”

Section: Discussionmentioning

confidence: 99%

Summer and Winter Cycles in Plasma Melatonin Levels in the Elephant Seal (Mirounga Leonina)

Griffiths¹,

Seamark²,

Bryden³

1979

Aust. Jnl. Of Bio. Sci.

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Plasma melatonin concentration of immature male elephant seals was determined by radioimmunoassay. Comparison of concentrations during two 24-h periods, one in midsummer and one in midwinter, showed that there was a marked circadian cycle in winter which was greatly modified during the long day length of summer. It is suggested that in summer there was sufficient ambient lighting during the night hours to depress the nocturnal rise in plasma melatonin. The complexity of pineal cycles in the natural environment is stressed, and in this regard the polar regions are of particular interest due to the extreme seasonal changes in day length there.

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Endocrine Rhythms Associated with Pineal Gland Function

Cited by 22 publications

References 86 publications

On the presence of different populations of pinealocytes in the mammalian pineal gland

On the presence of different populations of pinealocytes in the mammalian pineal gland

Plasma Melatonin Levels and Nocturnal Transitions between Sleep and Wakefulness

Summer and Winter Cycles in Plasma Melatonin Levels in the Elephant Seal (Mirounga Leonina)

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