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Levels of follicle-stimulating hormone, luteinizing hormone, oestradiol-17 beta and progesterone, and follicular growth in the pseudopregnant rat.
J Endocrinol. 1975 Jan; 64(1):37-47.JE

Abstract

Throughout a period of pseudopregnancy the peripheral blood levels of progesterone, oestradiol-17 beta, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), as well as the size-distribution of ovarian antral follicles were estimated in the rat. The progesterone concentrations, as measured by a competitive protein-binding technique, exceeded metoestrous values (25 ng/ml plasma) from day 3 of pseudopregnancy onwards. The highest levels were found on days 6 and 8 (91 ng/ml). From day 8 onwards the levels decreased gradually but were still above metoestrous values on the day of pro-oestrus after pseudopregnancy. Concentrations of oestradiol-17 beta, as measured by radioimmunoassay, were within the range of those at metoestrus (about 5 pg/ml plasma) until day 10. Thereafter levels increased to a value of 57 pg/ml. Concentrations of FSH, measured by radioimmunoassay, were within the range of metoestrous values until day 10 (about 100 ngNIAMD-rat-FSH RP-1/ml serum), but declined to a level of 33 ng/ml on day 12. Concentrations of LH, measured by radioimmunoassay, were generally within the wide range of metoestrous values (9-60 ng NIAMD-rat-LH RP-1/ml serum), but concentrations found on days 4, 8 and 10 were significantly lower than those found on preceding or subsequent days. Histological determination of the number of follicles present in various volume-classes, showed an increase in antral follicles on days 1 and 2, comparable to the increase observed during metoestrus and dioestrus 1 of the normal cycle. There was no change in the follicles between days 3 and 10 and they resembled those of early dioestrus. Preovulatory growth had occurred by day 12. Injection of human chorionic gonadotrophin (HCG) on days 2, 4 or 6 showed that ovulation could be induced only in some of the larger follicles. On the basis of these results it is suggested that during pseudopregnancy the high progesterone levels present result in a decreased plasma LH level which is insufficient to cause full maturation of the follicles and to stimulate oestrogen secretion to the levels required for induction of an ovulatory surge of LH release.

Authors

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Pub Type(s)

Journal Article

Language

eng

PubMed ID

1167896

Citation

Welschen, R, et al. "Levels of Follicle-stimulating Hormone, Luteinizing Hormone, Oestradiol-17 Beta and Progesterone, and Follicular Growth in the Pseudopregnant Rat." The Journal of Endocrinology, vol. 64, no. 1, 1975, pp. 37-47.
Welschen R, Osman P, Dullaart J, et al. Levels of follicle-stimulating hormone, luteinizing hormone, oestradiol-17 beta and progesterone, and follicular growth in the pseudopregnant rat. J Endocrinol. 1975;64(1):37-47.
Welschen, R., Osman, P., Dullaart, J., de Greef, W. J., Uilenbroek, J. T., & de Jong, F. H. (1975). Levels of follicle-stimulating hormone, luteinizing hormone, oestradiol-17 beta and progesterone, and follicular growth in the pseudopregnant rat. The Journal of Endocrinology, 64(1), 37-47.
Welschen R, et al. Levels of Follicle-stimulating Hormone, Luteinizing Hormone, Oestradiol-17 Beta and Progesterone, and Follicular Growth in the Pseudopregnant Rat. J Endocrinol. 1975;64(1):37-47. PubMed PMID: 1167896.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Levels of follicle-stimulating hormone, luteinizing hormone, oestradiol-17 beta and progesterone, and follicular growth in the pseudopregnant rat. AU - Welschen,R, AU - Osman,P, AU - Dullaart,J, AU - de Greef,W J, AU - Uilenbroek,J T, AU - de Jong,F H, PY - 1975/1/1/pubmed PY - 1975/1/1/medline PY - 1975/1/1/entrez KW - Animals, Laboratory KW - Biology KW - Clinical Research KW - Endocrine System KW - Estradiol--analysis KW - Estrogens KW - Follicle Stimulating Hormone--analysis KW - Genitalia KW - Genitalia, Female KW - Gonadotropins KW - Gonadotropins, Chorionic--administraction and dosage KW - Gonadotropins, Chorionic--side effects KW - Gonadotropins, Pituitary KW - Hematological Effects KW - Hemic System KW - Histology KW - Hormones KW - Luteinizing Hormone--analysis KW - Menstrual Cycle KW - Menstruation KW - Ovarian Effects KW - Ovary KW - Ovulation KW - Physiology KW - Pregnancy KW - Progestational Hormones KW - Progesterone--analysis KW - Pseudopregnancy--side effects KW - Reproduction KW - Research Methodology KW - Urogenital System KW - Uterine Effects KW - Uterus SP - 37 EP - 47 JF - The Journal of endocrinology JO - J Endocrinol VL - 64 IS - 1 N2 - Throughout a period of pseudopregnancy the peripheral blood levels of progesterone, oestradiol-17 beta, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), as well as the size-distribution of ovarian antral follicles were estimated in the rat. The progesterone concentrations, as measured by a competitive protein-binding technique, exceeded metoestrous values (25 ng/ml plasma) from day 3 of pseudopregnancy onwards. The highest levels were found on days 6 and 8 (91 ng/ml). From day 8 onwards the levels decreased gradually but were still above metoestrous values on the day of pro-oestrus after pseudopregnancy. Concentrations of oestradiol-17 beta, as measured by radioimmunoassay, were within the range of those at metoestrus (about 5 pg/ml plasma) until day 10. Thereafter levels increased to a value of 57 pg/ml. Concentrations of FSH, measured by radioimmunoassay, were within the range of metoestrous values until day 10 (about 100 ngNIAMD-rat-FSH RP-1/ml serum), but declined to a level of 33 ng/ml on day 12. Concentrations of LH, measured by radioimmunoassay, were generally within the wide range of metoestrous values (9-60 ng NIAMD-rat-LH RP-1/ml serum), but concentrations found on days 4, 8 and 10 were significantly lower than those found on preceding or subsequent days. Histological determination of the number of follicles present in various volume-classes, showed an increase in antral follicles on days 1 and 2, comparable to the increase observed during metoestrus and dioestrus 1 of the normal cycle. There was no change in the follicles between days 3 and 10 and they resembled those of early dioestrus. Preovulatory growth had occurred by day 12. Injection of human chorionic gonadotrophin (HCG) on days 2, 4 or 6 showed that ovulation could be induced only in some of the larger follicles. On the basis of these results it is suggested that during pseudopregnancy the high progesterone levels present result in a decreased plasma LH level which is insufficient to cause full maturation of the follicles and to stimulate oestrogen secretion to the levels required for induction of an ovulatory surge of LH release. SN - 0022-0795 UR - https://www.unboundmedicine.com/medline/citation/1167896/Levels_of_follicle_stimulating_hormone_luteinizing_hormone_oestradiol_17_beta_and_progesterone_and_follicular_growth_in_the_pseudopregnant_rat_ L2 - https://joe.bioscientifica.com/doi/10.1677/joe.0.0640037 DB - PRIME DP - Unbound Medicine ER -