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Biomedical subjects

H Cramer

Publications and source records attributed to H Cramer.

At least 109 records · Page 6Linked to original sources
PubMed1981

Cerebrospinal fluid adenosine 3',5'-monophosphate, 5-hydroxyindoleacetic acid and homovanillic acid in patients with sleep apnoea syndrome.

Adenosine 3',5'-monophosphate (cyclic AMP), 5-hydroxyindoleacetic acid (5-HIAA) and homovanillic acid (HVA) were determined in the cerebrospinal fluid of patients with respiratory disorder and hypersomnia and in control patients. Patients with the sleep apnoea syndrome confirmed polygraphically showed elevated levels of cyclic AMP and 5-HIAA. Cyclic AMP levels were inversely correlated with arterial Po(2), measured under resting conditions. The level of HVA also was raised, but the change was not statistically significant.

Cyclic AMP↗
PubMed1980

Characterization of ergot and non-ergot serotonin antagonists by prolactin and growth hormone profiles during wakefulness and sleep.

In order to further clarify the involvement of serotonin in the control of secretion of pituitary lactogens, diurnal and sleep prolactin (PRL) and growth hormone (GH) profiles were investigated in healthy subjects treated with ergot and non-ergot serotonin antagonists. A group of 10 subjects received a single oral dose of 2 mg each of pizotifen, methysergide, and the dopaminergic drug bromocriptine as reference substance, in comparison with placebo. Blood was collected at hourly intervals for 6 h. Another group of 10 individuals received either a placebo, 2.5 mg bromocriptine (n = 6) twice daily for 4 days or pizotifen (n = 10) 0.5 mg 3 times daily for 12 days before undergoing EEG recording and blood sampling during night sleep. The diurnal plasma profiles of PRL and GH were not modified by pizotifen, a non-ergot drug. Methysergide and bromocriptine, two ergot derivatives, significantly (P < 0.01 and P < 0.001 respectively) suppressed the basal secretion of PRL throughout the trial and increased plasma GH significantly (P < 0.01). The sleep profile of PRL was not modified by pizotifen but there was a moderate reduction in GH reaching the level of significance (P < 0.02) between hours 1 and 2 of sleep. Bromocriptine suppressed completely PRL secretion throughout the entire sleep period and significantly (P < 0.05) prolonged the secretory profile of GH. The results indicate the presence in the ergot molecule of a dopaminergic moiety responsible for PRL inhibition and GH stimulation. This effect is independent of the serotonin active component of the drug.

Adult↗
PubMed1980

Depression of cyclic AMP and cyclic GMP in the cerebrospinal fluid of rats after acute administration of ethanol.

The effect of single oral doses of ethanol on the levels of cyclic AMP and cyclic GMP in the cerebrospinal fluid was studied in rats. Ethanol markedly decreased the levels of both cyclic nucleotides for at least 24 h. The decrease of cyclic nucleotides after medium and high doses (1.65 and 4.59 g/kg) was slower in onset but more pronounced than the decrease after a low dose (0.55 g/kg) of ethanol.

Animals↗
PubMed1980

Glucaric acid excretion. Analysis of the enzymatic assay and findings in smokers and non-smokers.

Glucaric acid (GA) excretion in urine from cigarette smokers and non-smoking control subjects was determined enzymatically. There was no difference between GA 41.0 +/- 3.2 mumol/g creatinine (Cn; mean +/- SEM) in smokers and GA 43.1 +/- 3.4 mumol/g Cn in the controls. Gas chromatographic analysis of the GA-glucarolactone equilibrium was carried out in an attempt to elucidate the striking discrepancies in previous results.

Chromatography, Gas↗
PubMed1980

False aneurysm formation following arteriographic intimal dissection: serial studies in 2 patients.

Two patients with metastatic islet-cell carcinoma underwent multiple hepatic artery catheterizations for streptozotocin infusion. An intimal flap was raised during one of the initial arteriographic procedures and a false aneurysm developed. The progression of the aneurysm was documented on sequential studies. False aneurysm formation appears to be a relatively unappreciated complication of intimal dissection, and these 2 cases permitted observation of their natural history.

Adenoma, Islet Cell↗
PubMed1978

[Monoamine metabolites and cyclic nucleotides in the cerebrospinal fluid of patients with bismuth or mercury poisoning].

The central metabolism of dopamine, serotonin, cyclic AMP and cyclic GMP was studied by use of the probenecid test in three patients with bismuth encephalopathy and in one patient with mercury encephalopathy. The accumulation of HVA and of cGMP in the cerebrospinal fluid was depressed during the acute phase of bismuth encephalopathy with severe hyposomnia, while it was increased in a patient with regression of clinical symptoms and normal in a patient with more advanced recovery. The patient with chronic mercury poisoning showing a severe cerebellar ataxia and rigidity had an almost complete suppression of HVA accumulation and an increase of cGMP accumulation. No pronounced differences of 5-HIAA and cAMP behavior were found. It is concluded that the central metabolism of dopamine and of cGMP is severely affected in bismuth and mercury encephalopathies.

Adult↗
PubMed1977

Cyclic AMP in cerebrospinal fluid of manic and depressive patients.

Cyclic 3',5'-adenosine monophosphate (c-AMP) was measured in cerebrospinal fluid (CSF) of manic and depressive patients with and without probenecid administration both before and during treatment with various psychotropic drugs. Oral probenecid (100 mg/kg) produced substantial c-AMP accumulations in CSF suggesting a probenecid-sensitive transport mechanism for c-AMP. Baseline and probenecid-induced accumulations of c-AMP were not significantly different in manic and depressed patients, while baseline levels in depressed patients were higher than those in neurological controls. Imipramine, amitriptyline, lithium, tryptophan, and electroconvulsant therapies did not significantly alter levels or accumulations of c-AMP in CSF of depressed patients.

Administration, Oral↗
PubMed1976

In vitro effects of histamine liberator compound 48/80 on rat superior cervical ganglia with special regard to the small granule-containing cells.

The effect of the histamine liberator compound 48/80 on the rat superior cervical ganglia in vitro has been investigated. After incubation of the ganglia with compound 48/80: (1) ganglionic mast cells degranulate in the same manner as in other tissues; (2) cell bodies of the postganglionic neurons are not affected by compound 48/80; (3) there is evidence that ganglionic interneurons, the monoamine-containing cells are activated. The ultrastructural aspects of this process are characterized by degranulation of perikarya and accumulation of dense core vesicles in cell processes and in terminals adjacent to presynaptic membranes. These vesicles vary in size between 200-800 A in diameter. They may represent storage sites of the neuro-transmitter complexes that have undergone exocytosis. The results are discussed with special reference to models of exocytotic processes involving the adrenergic transmitter. It is concluded that monoamine-containing cells represent interneurons in sympathetic ganglia which inhibit ganglionic transmission and which are stimulated by low concentrations of compound 48/80 in vitro.

Animals↗
PubMed1976

3': 5'-Nucleotide phosphodiesterase in the superior cervical ganglion of the rat. Evidence for multiple forms and influence of the beta-adrenergic receptor system in the electrophoretic pattern of the enzyme.

Two forms of a cAMP phosphodiesterase were found in the superior cervical ganglia of the rat. The influence of various detergents on solubility and activity of the enzyme was studied. Two Km values were determined, one of 0.9mum and the other 270mum cAMP. Separation by polyacrylamide disc electrophoresis revealed four distinct peaks of enzyme activity. One of these activities was increased when ganglia were incubated with adrenaline for at least 4 h. The increase caused by adrenaline was unaffected when ganglia were pre-incubated with cycloheximide, but was blocked in the presence of propranolol, a beta-adrenergic antagonist. Incubation with dibutyryl cAMP for 4 h mimicked the effect of adrenaline. Brief incubation with adrenaline was without effect. Electrophoresis in the presence of 0.1% Lubrol W, a non-ionic detergent, showed that one band of activity disappeared, while the main peak of enzyme activity increased in size. Two-dimensional starch gel electrophoresis confirmed the results of the disc electrophoresis.

3',5'-Cyclic-AMP Phosphodiesterases↗
PubMed1976

[Results of cytologic examinations of the cervix in women under the age of thirty (author's transl)].

154 suspicious and positive findings for carcinoma in women between the ages of 18 and 30 were reported. Included here were 7 cases of invasive carcinoma, 57 cases of epithelial carcinoma, 8 cases of advanced dysplasia and 17 cases of dysplasia in beginning and intermediate stages. The findings from two gynecologic practices in which the physicians annually conducted a cytologic examination of the cervix on every woman, regardless of age, were studied in particular. In both of these practices, 64 of the 89 preliminary stages of carcinoma and carcinoma itself in this age group were discovered in this way. The total material came from 26 contributors. The participation on the part of the young women in both gynecologic practices was unexpectedly high (33% of all those patients receiving preventive examinations). The established practice of conducting cytologic cancer tests on the cervix uteri only after the age of 30 can no longer be justified. One possible causal factor for the increased morbidity and the earlier occurrence of the disease is the coincidence between genital infections and the increased occurrence of neoplasia of the cervix due to earlier onset of sexual activity. It is imperative that women be informed of the increased risks and that they be given the opportunity of a cervical cancer test even before the age of thirty.

Adolescent↗