Organ Weight Changes and Pituitary LH Content during Pregnancy and the Early Postpartum Period in the Hamster

Orsini, Margaret Ward; Schwartz, Neena B.

doi:10.1093/biolreprod/8.5.515

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…However, a functional relationship between adrenals and preputial glands was demonstrated in female laboratory rats by Ozegovic and Milkovic (1972). Although Anderson and Kennedy (1933) found no adrenal hypertrophy during pregnancy in the laboratory rat, Orsini and Schwartz (1973) showed that the adrenals of the golden hamster increased in Can. J. Zool.…”

Section: Discussionmentioning

confidence: 96%

Morphological changes in the ovaries and other organs of the collared lemming (Dicrostonyx groenlandicus) during pregnancy and pseudopregnancy

Hasler¹,

Banks²

1975

Can. J. Zool.

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HASLER, J. F., and E. M. BANKS. 1975. Morphological changes in the ovaries and other organs of the collared lemming (Dicrostonyx groenlandicus) during pregnancy and pseudopregnancy .Can. J. Zool. 53: 12-18.The histology of the ova and changes in organ weight8 were studied during pregnancy and pseudopregnancy in collareT1emmings (Dirr~~~runyxgroenlarrdic~~s). Females pdted with vasectomized males mated on the average every 10 days. Carpus luteum diameter reached a maximum on day 8 but decreased greatly by day 10 in pseudopregnant females. Corpus luteum diameter in pregnant females reached a rnaxirntrm by day 14 and had decreased 2 days post parrum. Ovanes, prepiltrals, and adrenals Increased in weight during pregnancy and pseudopregnancy. IrnplantaZion mcurred during 'the 5th day post co~lus. Corpora alhicantia disappeared within 77 days after partilritron but placenral scam were visible for at least 172 days after partuntion. HASLER, J. F., et E. M. BANKS. 1975. Morphological changes in the ovaries and other organs of the collared lemming (Dicrosronyx ~roenlandicns) dunng pregnancy and pseudopregnancy. Can. J. Zool. $3: 12-18.On a etudii I'histologie de I'ovaire et les changements de poids des organes durant la gmssesse et lafausse grossesse chez les lemmings 13icrosronyxgruendl~ndicus. Les femelles accouplees i des m3es ayant subi uoe vasectomie manifestent dcs sympt8mes de gmssesse environ tous les dix jours. Le diarnktre du corps jaune atteint son maximum le hurtitme jour et diminue de f a~o n importante jusqu'au jour 10 chez les fcrnelles en itat de fausse gmssesse. Chez les femelles enceintes. le diarnem du corps jaune atte~nt son maximum le quatonitme jour et marque deja une diminution deux jours apres la parturit~on. Le poids des ovaires de meme qut des glandes pkputiales et surrknales augmente duranz la grossesse e l la fausse grosuesse. L'implantat~on se produit durant le cinquitme jour qui suit le coit. Les corps blancs disparaissent dans le? premiers 77 jours aprks la panuntion, mais il reste des cicatrices placentaires encore visibles apres au moinr 172 jours.[Traduit par le journal]

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Section: Discussionmentioning

confidence: 96%

Morphological changes in the ovaries and other organs of the collared lemming (Dicrostonyx groenlandicus) during pregnancy and pseudopregnancy

Hasler¹,

Banks²

1975

Can. J. Zool.

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“…Pituitary LH concentrations were elevated in ovariectomized and pregnant rats but declined to control values during lactation (Nagai & Kunii 1972;Smith & Neill 1977;Steger & Peluso 1978), although lower than normal values have been reported for suckled rats (Minaguchi & Meites 1967) and monkeys (Weiss et al 1976). Orsini & Schwartz (1973) reported pituitary LH content increased in the pregnant hamster and decreased to post-ovulation levels at 48 h postpartum. The normal concentration of bioassayable TSH in the pituitary of lactating rats (Table 5) lends support to the original data of Sar & Meites (1969).…”

Section: Discussionmentioning

confidence: 92%

Regarding the validity of the endpoint response of the mouse (McKenzie) bioassay for thyrotrophin (TSH)

Ching¹

1981

Acta Endocrinologica

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The release of radiolabelled thyroid hormone into the circulation in low iodine fed mice has been used extensively as a bioassay for thyroid stimulating hormone (TSH). However, the specificity of several bioassays of pituitary hormones have been subject to question. Consequently, the validity of the assay endpoint for TSH in the mouse was re-evaluated with respect to the effect of luteinizing hormone (LH) whose chemical composition closely resembles that of TSH. Mice, prepared for bioassay of TSH received injections of purified LH or \g=a\ or \ g = b \ subunits of LH. Identical doses of LH and LH subunits were quantified by LH and TSH radioimmunoassays and the results compared with those obtained by the bioassay. Microgram quantities of LH and subunits of LH elicited appreciable responses in the TSH bioassay but produced only negligible effects in the TSH radioimmunoassay. The response of the TSH bioassay of LH and \g=a\ or \ g = b \ subunits of LH was 40\p=n-\56%that obtained with LH radioimmunoassay. However, the pituitary concentrations obtained by TSH bioassay when compared with those obtained by radioimmunoassays for TSH, LH, or growth hormone (GH) paralleled closely the TSH radioimmunoassay data, although in terms of quantitative estimates, there was a 15-fold discrepancy between the TSH assays. Estimations of pituitary concentrations of LH lead to the conclusion that, at the doses normally employed, most crude rat pituitary extracts do not contain sufficient quantities of LH to alter significantly bioassayable (McKenzie) estimates of TSH.

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The role of the young in the control of the hormonal events during lactation and behavioral weaning in the golden hamster

Swanson

Campbell

1981

Hormones and Behavior

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Organ Weight Changes and Pituitary LH Content during Pregnancy and the Early Postpartum Period in the Hamster

Cited by 4 publications

References 12 publications

Morphological changes in the ovaries and other organs of the collared lemming (Dicrostonyx groenlandicus) during pregnancy and pseudopregnancy

Morphological changes in the ovaries and other organs of the collared lemming (Dicrostonyx groenlandicus) during pregnancy and pseudopregnancy

Regarding the validity of the endpoint response of the mouse (McKenzie) bioassay for thyrotrophin (TSH)

The role of the young in the control of the hormonal events during lactation and behavioral weaning in the golden hamster

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