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J C Valcke

Publications and source records attributed to J C Valcke.

17 recordsLinked to original sources
PubMed1990

[Inhibin].

Explore the source record for details and available documents.

Activins↗
PubMed1987

[Indications and results of pituitary radiotherapy after microsurgery in acromegaly. 15 cases].

The present treatment of acromegaly consists of selective adenomectomy followed, when unsuccessful, by pituitary gland irradiation. Fifteen acromegalic patients were evaluated after adenomectomy, then radiotherapy. Growth hormone assays were performed after carbohydrate load and administration of thyroid stimulating hormone. Somatomedins were measured by radiocompetition using the vector protein. Cure was obtained with adenomectomy alone in 3 of the 15 patients (mean follow-up 39 months). The remaining 12 patients were all cured by subsequent irradiation at the cost of pituitary insufficiency in one-third of them. Post-surgical cure of acromegaly can only be asserted from range of strict criteria. The best indicators of persisting activity are high levels of growth hormone and/or somatomedins. A solitary somatotropic dysregulation does not necessarily herald a relapse.

Acromegaly↗
PubMed1977

Hormonal changes induced by bromocriptine (CB-154) at the early stage of treatment.

Fifteen female patients with amenorrhea and hyperprolactinemia were studied 1 to 3 times daily during the first 4 days of treatment with bromocriptine (2.5 mg b.i.d). Normal PRL levels were reached within one day in 12 while the mean value for the whole group showed no further significant decrease. Estradiol, LH and FSH levels did not vary significantly at this stage even in those 10 patients who subsequently resumed menstruation.

Adult↗
PubMed1977

Reversible gonadotropin deficiency in male Cushing's disease.

Twelve adult males with documented active Cushing's disease were studied. Mean plasma testosterone (T) was significantly decreased: 1.8 +/- 0.3 (SEM) ng/ml (N=6.8 +/- 0.5); gonadotropin measurements in 8 patients, in basal conditions and under LH-RH iv, showed a significant decrease in both FSH and LH. A further study of 11 patients in remission of Cushing's disease indicated a significant increase in plasma T and gonadotropins up to the normal range. One patient with an initial low T value had a normalized T while in remission, then a dramatic decrease when the disease relapsed. We conclude: a hypogonadotropic hypogonadism is found in male Cushing's disease; it disappears as early as hypercortisolism is suppressed. Some possible mechanisms are discussed.

Adolescent↗
PubMed1976

[Properties of anti-LH-RH serums induced by 2 different immunogens].

Several anti-LH RH antisera have been raised in Rabbits given as immunogen the synthetic decapeptide linked to bovine serum albumin by carbodiimide or bis-diazotized benzidine. Antibodies obtained with CDI as a coupling agent showed the highest titers and affinities enabling measurement of LH RH levels lower than 1 pg/tube. The specificity of the antisera, particularly toward 13 fragments of the molecule, were similar irrespective of the immunogen used.

Animals↗
PubMed1976

[Sexual side-effects of spironolactones. Possible mechanisms of their anti-androgen action].

Spirolactones (spironolactone, potassium canrenoate) may produce secundary sexual effects such as gynecomastia in man and menstrual disturbances in women. The mechanism of action of the antiandrogenic effects has been studied in man and rat. Acute i.v. injection of potassium canrenoate into man results in a decrease of plasma testosterone, without any change of gonadotropins. This decrease might be due to an impaired testicular steroidogenesis. On the other hand, spirolactones have an antiandrogenic effect at the target cells level. They do not modify the prostate 5alpha-reductase activity; however, they do inhibit the binding of androgens to their receptors. Thus the spirolactones interact with both biosynthesis and peripheral action of androgens.

Adult↗
PubMed1975

[Does rheumatic pleuresy exist?].

The authors report the case of a 20 year-old young man with old rheumatic heart disease in whom suddenly occurred sero-fibrinous pleurisy with fever. The usual cause of pleurisy, e.g. tuberculosis, were eliminated. On the other hadn, there was considerable evidence, including lengthening of the P-R interval, and raised anti-streptolysin titer at 1920 units, which suggested recurrence of rheumatic fever. The relationship between this disease and sero-fibrinous pleurisy is then discussed.

Adrenal Cortex Hormones↗
PubMed1975

Dissociated responses of plasma testosterone and estradiol to human chorionic gonadotropin in adult men.

Plasma testosterone (T), dihydrotestosterone (DHT) and estradiol (E2) were determined by radioimmunoassay in 10 normal males receiving hCG im 5000 IU on days 1, 2 and 3. The mean increase of plasma steroid on days 2, 3 and 1, respectively, was: 1.42, 1.79 and 1.87 times for T; 1.17, 1.56 and 1.49 times for DHT; 4.04, 3.29 and 2.33 times for E2. While T was still significantly increasing from day 2 to day 4, E2 significantly decreased. A positive correlation (P less than 0.01) was found between the basal T and the E2 peak after hCG, suggesting a release of E2 from a storage compartment in the testis. No significant change of either steroid was detected 4 h after the first hCG injection. In 6 cases of primary male hypogonadism, the mean basal values of T to hCG was defective, despite considerable individual variations. In 14 males with gonadotropin deficiency, basal values of T and E2 were very low; the T response to hCG ranged from undetectable to dramatic, and was correlated with the degree and duration of previous exposure to gonadotropin; and impaired response of E2 in all cases porvides a better estimate of the actual gonadotropin deficiency.

Adolescent↗
PubMedDate not supplied

["Non-secreting" plasma cell myeloma preceded by refractory sideroblastic anemia (author's transl)].

The authors report the association of a refractory sideroblastic anemia and a "non-excreting" plasma cell myeloma. The anemia was observed 8 years before the onset of the myeloma, which had typical hematological characteristics. Both kappa and gamma light chains were found in the cytoplasm and on the surface of the plasma cells. Pathologic characteristics of this type of myeloma are briefly recalled, as well as the relationships between sideroblastic anemia and kahler's disease, an example of disorders of two lines of hematopoiesis (erythrocytes and leucocytes).

Aged↗