Journal ArticleDOI
Exogenous melatonin may act as a reproductive-phase dependent modulator of the relationship in morphology between pineal and adrenal cortex in male Blossomheaded parakeet (Psittacula cyanocephala) and Indian Weaver bird (Ploceus philippinus)
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It is suggested that melatonin can act as a reproductive‐phase dependent modulator of the pineal gland and adrenal cortex in these birds.Abstract:
The influence of melatonin, at a daily dose of 250 μg/100 g b.w. for ten consecutive days on morphological parameters of the pineal and adrenal cortex was investigated in two diverse avian species, Blossomheaded parakeet (Psittacula cyanocephala) and Indian Weaver bird (Ploceus philippinus). The results suggest that melatonin administered during the breeding phase caused stimulation of the adrenal cortex as evidenced from the significant increase in adrenocortical cord width and nuclear size in both avian species. However, the pineal gland in both species remained unaltered during this phase. On the contrary, melatonin given during the non‐breeding phase failed to alter the adrenal cortex but stimulated the pineal gland activity as evidenced from the significant increase in pinealocyte nuclear diameter in both species alike. It is suggested that melatonin can act as a reproductive‐phase dependent modulator of the pineal gland and adrenal cortex in these birds.read more
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Chrono-neuroendocrine markers of the aging brain
Ettore Ferrari,Flavia Magri,M. Locatelli,G. Balza,T. Nescis,C. Battegazzore,Gianni Cuzzoni,Marisa Fioravanti,Sebastiano Bruno Solerte +8 more
TL;DR: Both the selective impairment of nocturnal melatonin secretion, and the reduction of hypothalamo-pituitary-adrenal (HPA) sensitivity to steroid feedback might be considered as markers of aging brain.
Journal ArticleDOI
Stimulatory response of pineal-thyroid nuclear morphology and function following adrenocortical modulation in rat (Rattus rattus)
TL;DR: It is concluded, that a mutual relationship between the pineal and the thyroid gland karyomorphological and functional parameters in response to corticoids and an antiadrenal agent in post pubertal male rat (Rattus rattus) is indicated.
Journal ArticleDOI
Steroid hormone and antihormone induced changes in the pineal and adrenocortical karyomorphology and cell proliferation in mice ( Mus musculus )
TL;DR: It was concluded that in male post-pubertal mice both pineal and adrenal glands show antagonistic response towards estradiol and testosterone administration, and although tamoxifen showed estrogen agonistic behaviour, flutamide conversely induced pineal - adrenal cytophysiological stimulation.
Journal Article
A Comparative Study Indicates Methimazole Induced Chemical Hypothyroidism Causes Inhibition of Pineal Gland Karyomorphology in Three Different Species of Animals
TL;DR: It is indicated that methimazole induced chemical hypothyroidism inhibits pineal gland activity in both mammals and birds.
Journal ArticleDOI
Exogenous Melatonin Induces Simultaneous Stimulation of Pineal and Adrenocortical Function in Relation to Karyomorphology, Cell proliferation and Corticosterone Content in Male Mice ( Mus musculus )
TL;DR: Melatonin has been found to simultaneously stimulate pineal and adrenocortical gland, morphology and function in post pubertal male mice (Mus musculus) and is associated with significantly increased adrenal corticosterone content.
References
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Journal ArticleDOI
Differential Effects of Melatonin on the Testes of Photoperiodic and Nonphotoperiodic Rodents
TL;DR: It is suggested that melatonin, and by implication the pineal gland, may play a more importent role in regulating testicular function of rodents whose reproductive activity is markedly dependent upon seasonal changes in day length than of rodent whose reproductive performance is relatively insensitive to photoperiodic cues.
Journal ArticleDOI
An annual cycle in the interrenal tissue of the adrenal gland of the white-crowned sparrow, zonotrichia leucophrys gambelii.
TL;DR: In the adrenal gland of a migratory subspecies of the white-crowned sparrow, Zonotrichia leucophrys gambelii as mentioned in this paper, the relative fractional volume of cortical tissue (FCV) and the relative density of sudanophilic material (SI) in the cortical cells correlate with conspicuous annual changes in the microanatomy of the gland.
Journal ArticleDOI
Absence of a Refractory Period in the Common Weaver Bird
J. P. Thapliyal,R. N. Saxena +1 more
TL;DR: This preliminary report deals with the effects of long days on the male Common Weaver Bird (Ploceus phi&pinus) in different phases of the annual cycle and suggests the absence of a refractory period.
Journal ArticleDOI
Subcutaneous Melatonin Implants Inhibit Reproductive Atrophy in Male Hamsters Induced by Daily Melatonin Injections
Russel J. Reiter,P.Kevin Rudeen,Jeffrey W. Sackman,Mary K. Vaughan,Linda Y Johnson,John C. Little +5 more
TL;DR: If hamsters received a weekly subcutaneous implant of melatonin in beeswax the daily melatonin injections failed to inhibit the growth of the reproductive organs and to depress pituitary LH and prolactin levels, and Beeswax by itself had no such effect.
Journal ArticleDOI
Influence of the Pineal Gland on Gonadal Maturation in the Japanese Quail
Anne Sayler,Albert Wolfson +1 more
TL;DR: The pineal gland in female Coturnix has a stimulatory influence on the time of ovarian maturation, and pinealectomy resulted in decreased ovarian weight, decreased oviducal and adenohypophyseal weights and delayed onset of oviposition in birds exposed to a stimulating 16-hr photoperiod.