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T Etienne

Publications and source records attributed to T Etienne.

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

Characterization of peptides cleaved by plasmin from the C-terminal polymerization domain of human fibrinogen.

The C-terminal region of the fibrinogen gamma chain is known to participate in several functional interactions including fibrin polymerization. This part of the molecule is retained on the gamma chain of fragment D (FgD) when fibrinogen is digested by plasmin in the presence of calcium to produce the fragment D-fragment E (FgD X FgE) complex but is lost if FgD is prepared in the absence of calcium. In an attempt to characterize the C-terminal polymerization domain we have used three techniques to examine this further degradation of FgD following the addition of EDTA and plasmin. Analysis of the digestion by sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed a progressive cleavage of the gamma chain to two small remnants. The polymerization-inhibitory activity of the whole digest was studied using acid-solubilized fibrin. A progressive loss of inhibitory activity was associated with gamma chain shortening, reaching greater than a 120-fold reduction at the end of digestion. The cleavage of peptides was followed by reverse-phase high performance liquid chromatography and the release of a characteristic peptide triplet was associated with gamma chain cleavage. Manual sequencing, amino acid analysis, and fast atom bombardment mass spectrometry established the three peptides as gamma 303-356, 357-373, and 374-405. These peptides have sequences in common with those peptides recently reported by other investigators to be potent polymerization inhibitors. However, when a mixture of the three peptides was added in a 200-fold molar excess to polymerizing fibrin, no inhibitory activity could be demonstrated. It is concluded that the C-terminal polymerization domain of fibrinogen may be an extended region which includes the sequence gamma 303-405, when this is contiguous with the remainder of the gamma chain.

Amino Acid Sequence↗
PubMed1985

[Thymomas].

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Adolescent↗
PubMed1984

The myotropic and plasma-calcium modulating effects of calcitonin gene-related peptide (CGRP).

Human and rat calcitonin gene-related peptides cause a dose-related contraction of guinea pig ileum, which is antagonised by an anti-histamine, mepyramine, and an anticholinergic compound, hyoscine. Both peptides also cause a positive inotropic and a positive chronotropic effect in the rat isolated auricle and these responses are antagonised by propranolol, a B adrenoceptor blocker. Further, the peptides lower plasma calcium levels in both rats and rabbits in a dose-related manner resembling calcitonin; in the rabbit, but not in the rat, the initial calcium lowering effect is succeeded by hypercalcaemia at higher doses, while in the chick, only the parathyroid hormone-like calcium-raising effect is seen.

Animals↗
PubMed1983

[Dexamethasone suppression in the depressed patient. Reflections apropos of an experience].

This work, based on the dexamethasone suppression test (DST) for 28 patients classified according to the Research Diagnostic Criteria (RDC), tries, by examining the literature, to point out the acquired knowledge through this new biological psychiatric instrument. The results confirm those of previous works. The discussion is directed towards a better delimitation between the different categories of primary affective disorder and the possible extensions of DST to other fields not yet enough studied.

Adjustment Disorders↗
PubMed1980

Characterisation of an adrenal zona glomerulosa-stimulating component of posterior pituitary extracts as alpha-MSH.

The secretion of aldosterone from the zona glomerulosa of the mammalian adrenal cortex is stimulated by ACTH, potassium, angiotensin II and III, growth hormone, serotonin and E series prostaglandins. Some experimental and clinical studies suggest that additional stimulants of the zona glomerulosa must exist, possibly including pituitary factors other than ACTH. The possibility that posterior pituitary extracts may contain a zona glomerulosa stimulant was first suggested 20 years ago, but has since received little attention. We describe here the purification from posterior pituitary extracts of activities that stimulate rat glomerulosa cells and whole tissue in vitro. One of the active compounds has been identified as alpha-MSH (melanocyte stimulating hormone).

18-Hydroxydesoxycorticosterone↗
PubMed1975

[Diagnosis of human active or latent human brucellosis by lymphocyte transformation. Inhibition of leukocyte migration and passive hemagglutination. Possible interference between brucellosis and some mental disorders].

Passive hemagglutination tests (H.T.), involving the coating of a soluble B. abortus antigen onto sheep red blood cells through chromium chloride, were always negative in non-brucellic subjects. Positive H.T., even at low titers (1:50), were associated with positive specific lymphoblastic (T.T.L.) and inhibition of leucocyte migration (I.M.L.) tests in 13 patients. These 3 tests were negative in 17 control brucellosis-free individuals. Positive H.T. confirmed a clinical diagnosis of brucellosis in 27 patients with dubious or negative responses to classical tests. Low positive (1:50, 1:100) H.T. may correspond to Brucella primary-infection or to a quiescent chronic infection, and higher titers to clinically active brucellosis. There is a correlation between cellular immunity tests (T.T.L., I.M.L.) and passive hemagglutination test. Furthermore, 39/88 women hospitalized in psychiatric wards were positive to H.T., and 6 of them were also highly positive to complement fixation and tube agglutination tests. Three T.T.L. and I.M.L., performed on samples from 3 H.T. (1:50) positive patients, were positive. These 30 patients were classified as depression or severe anorexia.

Adult↗
PubMed1975

[Electrogastroenterographic study of the digestive motor effects of prolonged psychotropic treatment].

Functional digestive complaints are frequent in psychiatri patients: simple constipation, which cannot be explained solely by the loss of the sensation of rectal fullness; occlusions, occasionally hemorragies; the late complication of dolichomegacolon (Bourgeois, 1973). In 160 subjects, an attempt to understand the physio-pathology were made by recording diurnal digestive motor activity using skin electrodes placed on the abdomen and extremities (electrogastroenterography or E.G.E.G.). A hypoactive E.G.E.G. was observed in 2/3 of 18 psychotic depressive patients, in 3/4 of 36 schizophrenies. The nocive effect of giving sedative phenothiazine and antiparkinsonian drugs (trihexyphenidyl or ethybenzatropine) during long periods is clear. Whereas non sedative phenothiazine and clotiapine gicen in small doses, do not have an undesirable effect. Sulpiride has been used in gastroduodenal dyskinesia. The dyskinesia noted by the E.G.E.G., sometimes found in the large intestin, were found in 55% of 30 patients with caracter disorders; they coincide with the high frequency of electro-encephalogram dysrythmies. Finally, in hysterical patients, one usually observes normal E.G.E.G., tracings which confirms the clinical observation that hysterical and psychosomatic symptoms, may succeed each other, but do not appear at the same time. In the same categories of patients, no longer treated in a classical psychiatric environment but in a group with institutional objectives, the same clinic results were obtained with fewer digestive disturbances. This tends to show the inutility and nocivity of excessive doses of psychotropic drugs given alone or in complexe association.

Adolescent↗
PubMedDate not supplied

Isolation and characterization of human calcitonin gene-related peptide.

The rat calcitonin gene has recently been shown to encode a novel peptide (rat calcitonin gene-related peptide, rCGRP) thought to be produced in nervous tissue after tissue-specific RNA processing. This peptide has so far been identified only in rat tissue, by immunocytochemistry and immunoassay. We now report the isolation of a related (89% homology) peptide from human tissue (hCGRP) which we have sequenced using a novel mass spectrometric approach, fast atom bombardment (FAB) mapping. The human peptide differs significantly from the predicted rCGRP structure in four positions in the amino acid sequence (three effecting charge changes), and the presence of a disulphide bridge and an amide, surmised in the rat work, is proven in the hCGRP molecule. hCGRP was present in plasma from 10 patients with medullary thyroid carcinoma (MTC) and in 6 MTC tumours removed at surgery, suggesting the tissue distribution may differ from that in the rat where the peptide is reported to be absent from thyroid tissue. hCGRP is shown to have biological activity and it is possible that its presence in MTC plasma may be responsible for some of the symptoms in this disease.

Amino Acid Sequence↗