In vivo and in vitro modulation of growth hormone and prolactin of a mixed somatotropic-lactotropic pituitary microadenoma

Both in vivo and in vitro responses of prolactin and growth hormone to stimuli were studied in an acromegalic, amenorrheic woman with a chromophobe adenoma of the pituitary gland. Preoperative testing revealed a prolactin rise after thyrotropin-releasing hormone and chlorpromazine and a decline after L-dopa and bromocriptine administration. During 3.5-hour incubations, cultured tumor cells produced significant increases of growth hormone and prolactin after dibutyryl adenosine 3',5'-cyclic monophosphate stimulation, while bromocriptine inhibited both hormones.

Neuroleptic drug-induced alterations on neonatal growth and development. I. Prenatal exposure influences birth size, mortality rate, and the neuroendocrine system

Subcutaneous injection of codeine or phenobarbital, and feeding amphetamine to rats during gestation and lactation caused irregularities in mortality rates, growth, development, and associated neuroendocrine events within the newborns. Most striking was the subnormal birth size, increased mortality rate, and decreased hypothalamic growth hormone-releasing activity of neonates of mothers fed the highest dose of amphetamine.

Slow turnover of manganese in active rheumatoid arthritis accelerated by prednisone

Total body and area counts of intravenously injected (54)Mn were measured periodically in 29 in-patients. A heterogeneous group of 19 control patients showed fair reproducibility in the immediate distribution, and considerable individual variance in the subsequent loss of the isotope. Eight studies of the effects of feeding excesses of manganous sulfate to five patients showed acceleration of the rate of loss of the radioisotope from the whole body and the liver. These findings seem compatible with the presence of control mechanisms in man, operating to vary the metal's excretion, while tending to preserve constancy of its concentration in tissues. Slow turnover rates of the metal were demonstrated in seven out of eight patients with active rheumatoid arthritis, in one with hydralazine disease, but not in one arthritic undergoing an impressive, spontaneous remission. Statistically significant differences were encountered in the measurements of (54)Mn turnover of the total body, the thyroid, and the liver. Administration of prednisone induced clinical improvement and significant acceleration of these turnovers. Slow turnovers are characteristic of nutritional manganese deficiency. Therefore, serum and blood manganese determinations were performed by neutron activation analysis on 14 control patients, and on six patients with active rheumatoid arthritis. A statistically significant elevation of the red cell manganese concentration was encountered in patients with rheumatoid arthritis. This argued against the presence of classical tracemetal deficiency and called for an alternative explanation of these findings.