1962
DOI: 10.1210/endo-71-1-181
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Effects of Pinealectomy, a Pineal Extract and Pineal Grafts on Light-Induced Prolonged Estrus in Rats

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1967
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Cited by 19 publications
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“…On the relation between pineal and gonadal cyclicities, an injection of the pineal extract produced diestrus in light-induced or aged persistent estrous rats, but had no influence on the regularity of the estrous cycle in adult animals (Meyer et al, 1961;Ifft, 1962). Using melatonin itself, Chu et al (1964) revealed that an increase in the incidence of estrus following pinealectomy was inhibited by melatonin injection.…”
Section: Discussionmentioning
confidence: 99%
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“…On the relation between pineal and gonadal cyclicities, an injection of the pineal extract produced diestrus in light-induced or aged persistent estrous rats, but had no influence on the regularity of the estrous cycle in adult animals (Meyer et al, 1961;Ifft, 1962). Using melatonin itself, Chu et al (1964) revealed that an increase in the incidence of estrus following pinealectomy was inhibited by melatonin injection.…”
Section: Discussionmentioning
confidence: 99%
“…The first paper that pinealectomy in the immature rats causes a significant increase of gonadal weights was presented by Izawa (1926). Following this, it has been frequently reported that the pinealectomy resulted in the gonadal hypertrophy in rats (Simonnet et al, 1951, Kitay;1954;Wurtman et al, 1959;Motta et al, 1967).…”
Section: Discussionmentioning
confidence: 99%
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“…Removal of the grafts appeared to revert the animals' estrous cycle to a pinealectomy pattern. In a similar study, Ifft (1962) reported that neonatal renal pineal grafts were unable to increase the incidence of diestrus in light-induced prolonged estrous rats that were maintained in constant light. The obvious question would be if the pineal could be expected to function, even in the grafted location, under functionally inhibitory lighting conditions and potentially without reinnervation by postganglionic sympathetic fibers.…”
Section: Discussionmentioning
confidence: 90%
“…On the other hand, the failure of pinealectomy to influence the develop ment and maintenance of PE in LL [Ifft, 1962;R eiter, 1973;present study] suggests that in long photoperiods or LL, the secretion of pineal compounds influencing reproductive functions is so low as to constitute a functional pineal ectomy. In rather puzzling contrast, P iacsek et al [1969] reported that pinealectomy resulted in increased ovarian size in hypophysectomized rats bearing pituitary transplants, whether the animals were exposed to 14L: 10D or to LL.…”
Section: Discussionmentioning
confidence: 99%