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Biomedical subjects

M Sheinfeld

Publications and source records attributed to M Sheinfeld.

25 records · Page 2Linked to original sources
PubMed1985

Cellular immune functions in patients with primary hyperparathyroidism: effects of histamine and cimetidine.

The possibility of a link between parathyroid hyperfunction and cellular immune functions was studied in primary hyperparathyroid (1 degree HP) patients. The effect of cimetidine on lymphocyte functions in 1 degree HP patients and control subjects was also investigated. Histamine-induced suppressor activity of lymphocytes from 1 degree HP patients was significantly greater than that of controls. Cimetidine addition to both normal and 1 degree HP lymphocyte cultures abolished histamine-induced suppression. In vivo administration of cimetidine, while ineffective towards normal lymphocytes, depressed phytohemagglutinin stimulation of 1 degree HP lymphocytes, indicating possible immunological damage caused by this drug, which is frequently used in the treatment of patients with 1 degree HP.

Cimetidine↗
PubMed1985

Plasma levels of adenosine 3',5'-monophosphate in the fetoplacental unit and maternal circulation at delivery.

Adenosine 3',5'-monophosphate (cAMP) was measured in matched samples of maternal plasma (MV) and umbilical artery (UA) and vein (UV) of 14 normal infants born following an uncomplicated vaginal delivery. There was good correlation between UA and UV cAMP levels, which seems to indicate that the fetoplacental unit maintains a constant equilibrium of the nucleotide concentration in the umbilical circulation. There was a markedly increased UA cAMP concentration at term relative to that of MV, as well as an arteriovenous gradient of plasma cAMP level (UA greater than UV) in the fetoplacental circulation, which strongly suggest that the high cAMP levels in the cord blood originate mainly from the fetus.

Adult↗
PubMed1985

L-Thyroxine-induced leukopenia in a patient with Hashimoto's disease: involvement of suppressor-cytotoxic T cells.

A study of in vitro reactivity to L-T4, as assessed by peripheral blood lymphocyte transformation, was carried out in a patient with Hashimoto's disease who developed leukopenia during treatment with L-T4. L-T4 stimulated lymphocyte transformation in this patient. The proliferating cells were of T lineage and further typing demonstrated that they bore the OKT8 antigen. Cell-mediated immune reactions mediated by OKT8+T cells might have caused the leukopenia, although other mechanisms involving cytotoxic antibodies or antibody-dependent cell-mediated cytotoxicity cannot be excluded.

Female↗
PubMed1985

Effect of metoclopramide--a dopaminergic blocker and endogenous cortisol on TSH secretion in critically ill men.

In 17 critically ill men, low levels of FT4, TT4, TT3 and elevated levels of rT3 and cortisol were found. In spite of the low levels of circulating thyroid hormones, TSH levels of the critically ill men were significantly lower than those of the control group, with no correlations to the high cortisol levels. After iv injection of metoclopramide (MCP), a dopamine (DA) receptor blocker, the TSH and prolactin (Prl) increments in the critically ill patients were significantly lower than in the controls. No correlation was observed between basal cortisol levels and integrated TSH response to MCP. It is suggested that increased DA tone or high cortisol levels are not responsible for the lower basal TSH levels and for the blunted TSH or Prl responses to MCP in the critically ill. High levels of cortisol may be responsible for the altered TT4 peripheral metabolism to TT3 and rT3 in these patients.

Adult↗
PubMed1975

Plasma thyroxine changes of the Apollo Crewman.

Blood drawn from Apollo crew member; to the mission, at recovery, and postmission was used to examine the effect Apollo mission activities have on tyroid hormone levels. At recovery, statistically significant increases in thyroxine and the free thyroxine index were found. Serum cholesterol and triglycerides were decreased. No change of statistical significance was found in the T3 binding percentage, total serum proteins, and albumin. We conclude that apollo activities and environment caused the postmission increase in serum cholesterol may be one result of the increased thyroxine activity.

Aerospace Medicine↗