Effect of Copulation on the Release of Pituitary Gonadotropins in Male and Female Rats

Taleisnik, S.; Caligaris, L.; Astrada, J. J.

doi:10.1210/endo-79-1-49

Cited by 100 publications

(48 citation statements)

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“…3). Such changes are consistent with the observed depletion of glycogen stores at this time (Boettiger, 1946;Kostyo, 1957), and may be the result of a transiently increased ovarian steroid secretion, induced by the release of lh which has been shown to occur after a copulatory stimulus (Taleisnik, Caligaris & Astrada, 1966).…”

Section: Discussionsupporting

confidence: 85%

Glucose Utilization by the Myometrium During Early Pseudopregnancy in the Rat

Yochim¹,

Saldarini²

1969

Reproduction

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Section: Discussionsupporting

confidence: 85%

Glucose Utilization by the Myometrium During Early Pseudopregnancy in the Rat

Yochim¹,

Saldarini²

1969

Reproduction

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“…Furthermore, they indicate that the effective ness of the stimulus varies according to the stage of the es trous cycle. Other pituitary hormones whose release is aug mented by cervicovaginal stimulation include prolactin [I], LH [35,41], FSH [34], melanocyte-stimulating hormone [36], and oxytocin [14]. Variations of the response during the estrous cycle, suggesting ovarian modulation of the neuro endocrine reflex have been reported for prolactin [II] and for oxytocin [30].…”

Section: Discussionmentioning

confidence: 99%

TSH Release during the Estrous Cycle of the Rat: Variations in Responsiveness to Cervicovaginal Stimulation

Castro-Vázquez

Ojeda²,

Krulich

et al. 1981

Neuroendocrinology

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Serum TSH, LH and FSH were measured at various times during the day, during the estrous cycle of the rat. Proestrous surges of FSH and LH were detected as previously reported. TSH values fell to low levels in the late afternoon on each day of the cycle. There was a significant elevation of TSH at 13.00 h on both proestrus and estrus. The elevation of TSH on proestrus was accompanied by a significant fall in pituitary TSH stores. LH stores were also significantly depleted by 19.00 h on proestrus. Cervicovaginal stimulation by a glass rod provoked a significant rise in serum TSH 3 h after stimulation at 10.00 h on estrus but not on other days of the cycle. Responsiveness to a test dose of TRH varied during the cycle. It was maximal on proestrus and declined to minimum values on diestrus day II. Values were further lowered after ovariectomy but were restored to diestrus day II levels by treatment with estradiol. It is concluded that there are important cyclic variations in TSH release in the female rat, that cervicovaginal stimulation can provoke TSH release on estrus and that these changes are associated with altered responsiveness to TRH. We conclude that ovarian steroids modulate the release of TSH from the pituitary and affect the responsiveness to cervicovaginal stimulation. These changes are presumably brought about by alterations in TRH release and in responsiveness of the pituitary to the neurohormone.

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“…These findings suggest that estradiol could modulate the activity of the Al cell group. On the other hand, some peripheral sensory inputs to the brain have been shown to affect gonadotropin secretion (Taleisnik et al, 1966 ;Davidson et al, 1973 ;Moss et al, 1977 ;Hill, 1962 ;Burder et al, 1981). However, it is not clear yet whether the interruption of afferent inputs to the brain stem affects the function of the noradrenergic system involved in gonadotropin secretion.…”

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confidence: 99%

Blockade of the preovulatory release of gonadotropins and prolactin by spinal transections in female rats.

1983

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The effect of spinal transections on the preovulatory release of gonadotropins and PRL was investigated in female rats. A preovulatory rise in serum LH, FSH and PRL and subsequent ovulation were prevented by complete spinal transections (CST) at high thoracic levels (T3-T7), but not at low thoracic and lumbar levels (T8-L5), performed at 1000-1230 h on proestrus.Norepinephrine (NE) concentrations in the preoptic-anterior hypothalamic area at 1700-1800 h on proestrus were also significantly reduced by CST at high thoracic levels, but not at lumbar levels. Either electrochemical stimulation of the suprachiasmatic part of the preoptic area or NE injection into the third ventricle at 1400-1500 h on proestrus restored ovulation in animals with CST at high thoracic levels. Animals with CST at lumbar levels exhibited relatively regular 4-day cycles, but those with CST at high thoracic levels showed prolonged periods of diestrous (8-20 days) before they resumed cyclicity.In the case of partial transections, bilateral transections of the lateral columns, but not transections of the dorsal or medial columns, of the spinal cord at T4-T5 significantly blocked the preovulatory gonadotropin release and the occurrence of ovulation.Unilateral transections of the lateral columns of the spinal cord or unilateral electrolytic lesions of the ventrolateral part of the medulla oblongata failed to block ovulation. When combinations of them were performed ipsilaterally, ovulation occurred, but when they were performed contralaterally, the incidence of ovulation was significantly decreased. These results suggest that the ascending neural pathway in the lateral columns of the spinal cord projecting to the ipsilateral VLMO participates in the neural mechanisms controlling the preovulatory release of gonadotropins and PRL by maintaining NE levels in the preoptic-anterior hypothalamic area.

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Effect of Copulation on the Release of Pituitary Gonadotropins in Male and Female Rats

Cited by 100 publications

References 0 publications

Glucose Utilization by the Myometrium During Early Pseudopregnancy in the Rat

Glucose Utilization by the Myometrium During Early Pseudopregnancy in the Rat

TSH Release during the Estrous Cycle of the Rat: Variations in Responsiveness to Cervicovaginal Stimulation

Blockade of the preovulatory release of gonadotropins and prolactin by spinal transections in female rats.

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