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Biomedical subjects

C Robyn

Publications and source records attributed to C Robyn.

At least 37 records · Page 2Linked to original sources
PubMed1985

Effect of growth hormone-releasing factor on plasma growth hormone, prolactin and somatomedin C in hypopituitary and short normal children.

We studied the effect of a single intravenous bolus of 0.5 microgram/kg of growth hormone-releasing factor (GRF) on plasma GH, prolactin (PRL) and somatomedin C (SMC) in 12 short normal children and 24 patients with severe GH deficiency (GHD), i.e. GH less than 5 ng/ml after insulin and glucagon tolerance tests. GRF elicited an increase in plasma GH in both short normal and GHD children. The mean GH peak was lower in the GHD than in the short normal children (8.2 +/- 2.5 vs. 39.2 +/- 5.1 ng/ml, p less than 0.001). In the GHD patients (but not in the short normals) there was a negative correlation between bone age and peak GH after GRF (r = -0.58, p less than 0.005); GH peaks within the normal range were seen in 5 out of 8 GHD children with a bone age less than 5 years. In the short normal children, GRF had no effect on plasma PRL, which decreased continuously between 8.30 and 11 a.m. (from 206 +/- 22 to 86 +/- 10 microU/ml, p less than 0.005), a reflection of its circadian rhythm. In the majority of the GHD patients, PRL levels were higher than in the short normal children but had the same circadian rhythm, except that a slight increase in PRL was observed 15 min after GRF; this increase in PRL was seen both in children with isolated GHD and in those with multiple hormone deficiencies; it did occur in some GHD patients who had no GH response to GRF. Serum SMC did not change 24 h after GRF in the short normal children. We conclude that: (1) in short normal children: (a) the mean GH response to a single intravenous bolus of 0.5 microgram/kg of GRF is similar to that reported in young adults and (b) GRF has no effect on PRL secretion; (2) in GHD patients: (a) normal GH responses to GRF are seen in patients with a bone age less than 5 years and establish the integrity of the somatotrophs in those cases; (b) the GH responsiveness to GRF decreases with age, which probably reflects the duration of endogenous GRF deficiency, and (c) although the PRL response to GRF is heterogeneous, it does in some patients provide additional evidence of responsive pituitary tissue.

Adolescent↗
PubMed1984

Cleaving of disulfide bridges and apparent molecular weight of human prolactin variants as revealed by immunoperoxidase electrophoresis.

Five highly purified preparations of human pituitary prolactin, widely used in radioimmunoassays, were analyzed by immunoperoxidase electrophoresis with rabbit antisera raised against ovine and rat prolactin. When unreduced, the prolactin content of these preparations was separated into one major prolactin-like immunoreactive band of Mr 23,000, and four fainter immunoreactive bands of Mr's 16,000, 22,000, 25,000, and 45,000. Increasing the 2-mercaptoethanol concentration modified the relative proportions and the Mr of immunoreactive bands so that, after extensive reduction, only two immunoreactive bands were separated, one major band of Mr 25,000 and one fainter band of Mr 17,000. A direct relationship existed between the load of prolactin submitted to electrophoresis in the 0.25 to 75 ng range and the optical density of the separated bands.

Animals↗
PubMed1984

Plasma glucose, insulin, glucagon and prolactin during long lasting lactation.

Circulating levels of glucose and particularly those of insulin are significantly lower in African mothers (Kivu, Zaire) nursing their infants than in non pregnant and non lactating women of the same area. Furthermore, the glycemia and the insulinemia increase relatively less after a glucose load in the breastfeeding mothers. The lack of glucose available to the mammary gland may explain the low volumes of milk produced by the lactating mothers in this region of Africa.

Adult↗
PubMed1984

Epidemiology of pregnancies with unknown last menstrual period.

A group of women with unknown last menstrual period was studied representing 16% of a total of 22 404 pregnant women recorded using a common perinatal form. Unknown menstrual period is associated with high rates of low birth weight and with low socioeconomic and sociodemographic status. Such characteristics are also associated with a high rate of preterm deliveries. Thus any possible bias introduced in studies of prematurity by ignoring the group of women with unknown last menstrual period should be carefully checked.

Adolescent↗
PubMed1984

[The reproductive function following a hydatidiform mole].

This paper starts with a short description of the history of the discovery of the hydatidiform mole ( Tulp in 1641) and of the treatment (before 1956, hysterectomy in most cases). After 1961 chemotherapy started to be used even in patients who had cerebral metastases. 72 patients who had attended Professor Hubinont 's department in the University Hospital of Saint-Pierre in Brussels between January 1971 and December 1981 were followed up. Questionnaires were sent to the patients and to their doctors who were treating them in order to try and find out what had happened in subsequent pregnancies and what the maternal and fetal consequences and complications were. The social class and the marital status of the patients was also considered as well as their wish to become pregnant again. Of the 72 cases that were followed up after evacuation 63 (87.5%) recovered while 9(12.5%) had clinical, biological or radiological signs of persistent non-metastatic (3) and metastatic (6 cases) active disease. The department asked patients not to become pregnant in the year following evacuation of the mole. 10% were sterilised, 4 by hysterectomy and 4 by tubal ligation. 42% used the oral contraceptive pill and 34% (24 cases) condoms. Control follow-up of patients who became pregnant was compared with a group of 2 529 pregnancies in Saint-Pierre Hospital during the year 1981. 44 out of the 72 patients who were followed up after hydatidiform mole became pregnant with a total of 52 pregnancies. Ten became pregnant in the first 6 months after attempting it, 11 between 6 and 12 months and 23 after a delay of 12 months. Out of the 52 pregnancies, 34 5%) had a live baby at term. 6 were premature and 31 out of 34 babies delivered at term were delivered vaginally and 3 by Caesarean. There were 9 spontaneous abortions (17%) and 2 terminations of pregnancy (4%). Three patients had repeated non-intentional abortions and one had a still-birth for which the cause could not be found. Only one other had a second mole. When these results are compared with the histories of these patients before they had the hydatidiform mole there did not seem to be any increase in the number of spontaneous abortions or premature labours, nor was there when this group was compared with a control group. Only one of the 38 live-born children showed a major congenital abnormality which was varus equinus. There was no possibility of picking out statistically anything of value as far as congenital malformations was concerned.

Adolescent↗
PubMed1983

Monomeric pituitary growth hormone and prolactin variants in man characterized by immunoperoxidase electrophoresis.

Immunoperoxidase electrophoresis, combining SDS--ME--PAGE and the 'double bridge' immunoperoxidase staining was applied to crude human pituitary homogenates. With anti-hGH and anti-hPL sera, 4 hGH-related monomers were characterized: a Mr 22 000 peptide corresponding to hGH; a Mr 20 000 peptide corresponding to the known hGH variant and two unknown hGH variants (Mr 65 000 and Mr 75 000). With anti-ovine, rat and human PRL sera, 4 PRL-related monomers were immunostained: one comigrated with purified hPRL (Mr 25 000), and 3 were unknown (Mr 29 000; Mr 45 000; Mr 16 000).

Aged↗
PubMed1983

Immunocytochemical localization of prolactin-like immunoreactivity in rat pancreatic islets.

Animal experiments and clinical data indicate that prolactin (PRL) induces hyperinsulinemia and even diabetes. The effects of PRL on carbohydrate metabolism may be explained by at least two different mechanisms. Either PRL induces an insulin resistance at the peripheral tissue level, or PRL has a direct cytotropic effect on the pancreatic islets. Obviously, both mechanisms inducing hyperinsulinemia may coexist. We report here immunocytochemical evidence that PRL is localized in the endocrine pancreas of the normal adult rat. More precisely, the immunoreactive PRL is distributed in the cytoplasm of insulin-secreting B cells. These findings support a direct action of PRL on the endocrine pancreas.

Animals↗
PubMed1983

Immediate and delayed alterations of adrenocorticotropin and cortisol nyctohemeral profiles after corticotropin-releasing factor in normal man.

Intravenous injections of 50 micrograms corticotropin-releasing factor (CRF) to four normal men at 0900 and 2300 h were followed by significant plasma ACTH and cortisol elevations, without changes in GH and PRL concentrations. The responses were more easily assessed late in the evening than in the morning, when they were superimposed upon the spontaneous hormonal variations. The initial hormonal response was always followed by a period of decreased hormonal values compared to control patterns. The normal pituitary-adrenal response to CRF was blunted or abolished by prior administration of dexamethasone. These data suggest that exogenous administration or CRF-induced endogenous production of glucocorticoids modulates the sensitivity of corticotropic cells to the action of CRF. Since normal ACTH and cortisol secretory episodes are likely to obscure the effects of CRF, stimulation tests for clinical purposes should be performed during the quiescent period, i.e. late in the evening.

Adrenocorticotropic Hormone↗
PubMed1983

[Genetic factors in gestational trophoblastic tumors].

Gestational trophoblastic tumours group together the complete hydatidiform mole (classical) and partial mole (with fetus), invasive mole and choriocarcinoma. Genetically, trophoblastic tumours can arise in different ways: they can derive from normal zygotes with the maternal and paternal haplotype (normal pregnancy), or from a triploid zygote (partial mole) or from an XX zygote possessing only a duplicated male haplotype and no maternal contribution (complete mole). The low malignancy rate in partial mole (2.4%) compared to the complete mole (10 to 20%) remains unknown. Further analysis of the genetics of these tumours may well contribute to the understanding of the process of carcinogenesis.

Choriocarcinoma↗
PubMed1983

[Embryonal mole: value of echography. Apropos of 9 cases].

Hydatidiform embryonic mole is characterised by a special appearance of the placenta, the presence of an embryo or a fetus and a triploid caryotype. The authors report on ultrasound analysis of 9 hydatidiform moles in which the histological diagnosis was confirmed by careful anatomo-pathological examination (with suspicion of triploidy). The ultrasound diagnosis of a complete or partial hydatidiform mole can be made if the following criteria are noted: the placenta is larger and thicker than the placenta of pregnancies of the same duration and shows up with a partial molar appearance; there is the presence of an empty gestation sac or one that contains amorphous echoes suggesting a macerated fetus; a well formed fetus, which has died or is alive but has intra-uterine growth retardation; in early pregnancies, pregnancies that are usually not progressing; if there is a suspicion of a hydatidiform mole search should be made thoroughly for associated malformations (such as triploidy); the presence of lutein cysts of the ovary is a rarity.

Adolescent↗
PubMed1982

The relationship between episodic variations of plasma prolactin and REM-non-REM cyclicity is an artifact.

The concept of concomitance between nadirs and peaks of plasma levels of PRL and, respectively, rapid eye movement (REM) and non-REM stages in sleep was reevaluated using 24 nighttime profiles of plasma PRL collected at 15-min intervals and the corresponding polygraphic recordings of sleep. The subjects were 5 healthy young male adults. Data were examined using the methodology described in the original report, consisting of averaging across individual nights PRL levels during REM and non-REM sleep stages as well as using a detailed spike by spike analysis of each individual pair of hormonal and sleep profiles. We showed that in our subjects, there was no relation, other than a purely random one, between episodic PRL fluctuations in plasma and REM-non-REM cycles.

Adult↗
PubMed1981

Serum levels of prolactin and milk production in women during a lactation period of thirty months.

Serum prolactin was measured in single blood samples collected from 219 nursing mothers of the Kivu region (Zaïre) during 30 post-partum months. In addition the number of feeding episodes per day and the amount of milk given to the child in 24 h were recorded. The mean serum prolactin levels remained around 1000 mu/l during the first 15 months of lactation and fell during the next 3 months to 550 mu/l. A decline in milk production per day occurred during the second year, but it was less marked than that of prolactin. This decline seemed to be associated with the decline in suckling frequency as the quantity of milk given per feed remained almost unchanged throughout lactation. The average amount of milk given by mothers with serum prolactin levels in the range of values seen in non-lactating and non-pregnant women (about 500 mu/l) is nevertheless of some 35 g per feeding or 260 g per day. These results demonstrate that milk production can be maintained in women with normal levels of prolactin and suggest that prolactin plays a permissive role in established lactation.

Female↗