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Biomedical subjects

Y Lefebvre

Publications and source records attributed to Y Lefebvre.

At least 55 records · Page 3Linked to original sources
PubMed1970

Anatomical and functional changes induced by oral contraception.

The hormonal contraceptives seem to have no direct effect on cervical carcinoma or dysplasia, but they are responsible for the appearance of glandular adenomatous hyperplasia of the endocervix.The long-term use of progestins is responsible for the inactive appearance of the ovaries, with thickening of the tunica albuginea, rare follicle growth, occasional fibrosis of the stroma and a decreased DNA formation.After stopping oral and injectable hormonal contraceptives the first cycle is usually long and cases of amenorrhea have been reported. The causes of secondary amenorrhea probably lie in the hypothalamus and/or the ovaries.The time lapse between cessation of oral contraception and conception is between 5.8 and 6.5 months. No increase in abortion has been noted, but abortuses and ova have an increased polyploid tendency and incidence of chromosome breaks. Further investigations of larger series are necessary to provide definite proof. Meanwhile it would seem advisable that after cessation of hormonal contraception there should be a time lapse of six to eight months before a patient becomes pregnant.

Abnormalities, Drug-Induced↗
PubMedDate not supplied

Contribution of exogenous progesterone to human adrenal cortisol synthesis in vitro: a comparison of early gestation fetal and adult tissues.

The ability of human adult adrenal to utilize progesterone (P4) for cortisol (F) synthesis in vitro has been compared with that of fetal adrenal tissue. Explant cultures were studied for 6 days using Ham's F10 medium supplemented with 10% fetal bovine serum (FBS), with or without added P4 as substrate. Short-term (4h) incubations of fresh tissue minces were carried out in Ham's F10, with or without P4, in the absence of FBS. In contrast with the fetal gland, F production by cultured adult tissue was unaffected by addition of P4. During short-term incubations, P4 increased F production 150-fold in the fetal tissue as compared to 2- to 4-fold in the adult. ACTH had no acute effect on the P4 to F conversion in either tissue. These results demonstrate that the fetal adrenal exhibits a greater ability to utilize P4 for F production than the adult adrenal.

Adolescent↗