Tryptophan Feeding Induces Sensitivity to Short Daylengths in Photoref ractory Hamsters

Wilson, John; Meier, Albert

doi:10.1159/000123437

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…High serotonin concentration in certain areas of the brain (hypothalamus, midbrain and medulla) has also been reported in sexually regressed scotosensitive hamsters. This seasonal reproductive condition may be induced by tryptophan feeding in photorefractory hamsters and is associated with high serotonin concentration and turnover rate (Wilson and Meier, 1983). Retardation in reproductive activity in aging rat is also correlated with hypothalamic deficiency of catecholamine and can be corrected with administering L-DOPA, epinephrine or improniazid (Quadri et al, 1973).…”

Section: Femalementioning

confidence: 99%

“…Retardation in reproductive activity in aging rat is also correlated with hypothalamic deficiency of catecholamine and can be corrected with administering L-DOPA, epinephrine or improniazid (Quadri et al, 1973). Maintenance of estrous cycle in aging female rat is also reported to be influenced by centrally acting drug like L-DOPA, which alters the catecholamine level (Forman et al, 1980) and scotosensitivity in Syrian hamster by tryptophan feeding (Wilson and Meier, 1983).…”

Section: Femalementioning

confidence: 99%

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Mucuna pruriens seed powder feeding influences reproductive conditions and development in Japanese quail Coturnix coturnix japonica

Prasad

Qureshi

2009

Animal

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This study was designed to test whether Mucuna pruriens, a natural source of L-dihydroxyphenylalanine (L-DOPA, a dopamine precursor) feeding, can influence development and reproductive conditions in the high food value bird, Japanese quail, Coturnix coturnix japonica. Experiments were performed in both male and female Japanese quail. One-week-old quail chicks were divided into three groups of 36 birds each. Group I was provided with normal diet and served as control. Group II was provided with food mixed with L-DOPA (50 mg/15 g food) and Group III was provided with food mixed with M. pruriens seed powder (480 g/kg food). At the age of 3 weeks (when birds were sexually distinguished) Group I was divided into two subgroups IA (male) and IB (female) of six birds each. Similarly, Groups II and III were sub-divided into IIA (male), IIB (female) and IIIA (male), IIIB (female), respectively, of six birds each. Observations were made up to the age of 5 weeks. Male experimental groups (IIA and IIIA) showed significantly increased testicular activity, cloacal gland volume, body weight (BW), plasma testosterone and LH level in comparison to control (IA). Similarly female experimental groups (IIB and IIIB) showed significantly greater weight of reproductive organs (uterus, ovary, oviduct and ovarian follicle), BW, egg weight and size and number of follicles. On the other hand, plasma prolactin level was significantly low in comparison to control (IB). Results suggest that M. pruriens is a rich natural source of L-DOPA and the development and reproduction in Japanese quail might be associated with the dopaminergic system of the brain.Keywords: reproduction, Mucuna pruriens, L-DOPA, nutrition, Japanese quail IntroductionAccording to our present knowledge, neuropeptides and biogenic amines are the most important secretions of neuroendocrine cells. The role of the central nervous system (CNS) neurotransmitters, which appear to be the mediator of many control mechanisms in mammals (Weiner and Ganong, 1978), is little understood in other vertebrate groups except for mammals. The neuroendocrine system is an integral component of the neuronal apparatus of the brain, a major portion of which is concentrated in the hypothalamus. The hypothalamic monoamines dopamine (3,4-dihydroxyphenylalanine), noradrenalin and serotonin have profound effects on the release of mammalian pituitary hormones, presumably in most cases by modulating the release of the hypothalamic hormone . The hypothalamus is of paramount importance as an 'integration center' for the various influences on pituitary function. The hypothalamus apparently responds to the exteroceptive and interoceptive stimuli by altering the secretion of certain neurotransmitters and release hormones. Ideally, a study of the control of pituitary function should not only show the effects of any particular influence on hormone secretion but also demonstrate the changes in the metabolism of neurotransmitters and release of inhibiting hormones. Dopamine (DA) is reported to be synthesized large...

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Section: Femalementioning

confidence: 99%

Section: Femalementioning

confidence: 99%

Mucuna pruriens seed powder feeding influences reproductive conditions and development in Japanese quail Coturnix coturnix japonica

Prasad

Qureshi

2009

Animal

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Circadian Organization of the Avian Annual Cycle

Meier

Russo

1985

Current Ornithology

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Age-related defects in spatial memory are correlated with defects in the late phase of hippocampal long-term potentiation in vitro and are attenuated by drugs that enhance the cAMP signaling pathway

Bach

Barad

Son

et al. 1999

Proc. Natl. Acad. Sci. U.S.A.

518

339

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To study the physiological and molecular mechanisms of age-related memory loss, we assessed spatial memory in C57BL/B6 mice from different age cohorts and then measured in vitro the late phase of hippocampal longterm potentiation (L-LTP). Most young mice acquired the spatial task, whereas only a minority of aged mice did. Aged mice not only made significantly more errors but also exhibited greater individual differences. Slices from the hippocampus of aged mice exhibited significantly reduced L-LTP, and this was significantly and negatively correlated with errors in memory. Because L-LTP depends on cAMP activation, we examined whether drugs that enhanced cAMP would attenuate the L-LTP and memory defects. Both dopamine D1/D5 receptor agonists, which are positively coupled to adenylyl cyclase, and a cAMP phosphodiesterase inhibitor ameliorated the physiological as well as the memory defects, consistent with the idea that a cAMP-protein kinase A-dependent signaling pathway is defective in age-related spatial memory loss.

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Tryptophan Feeding Induces Sensitivity to Short Daylengths in Photoref ractory Hamsters

Cited by 10 publications

References 26 publications

Mucuna pruriens seed powder feeding influences reproductive conditions and development in Japanese quail Coturnix coturnix japonica

Mucuna pruriens seed powder feeding influences reproductive conditions and development in Japanese quail Coturnix coturnix japonica

Circadian Organization of the Avian Annual Cycle

Age-related defects in spatial memory are correlated with defects in the late phase of hippocampal long-term potentiation in vitro and are attenuated by drugs that enhance the cAMP signaling pathway

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