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Biomedical subjects

M Delaage

Publications and source records attributed to M Delaage.

At least 55 records · Page 3Linked to original sources
PubMed1985

[Monoclonal antibody analysis of human pancreatic juice components related to the pancreatic calculi protein].

A CaCO3-crystal growth inhibitor has recently been isolated from the calculi of patients affected by pancreatic lithiasis. It is a phosphoglycoprotein, with a molecular weight of 14,000, whose probable physiological role is the stabilization of exocrine pancreatic secretion which is supersaturated with respect to CaCO3. In order to isolate this inhibitor from human pancreatic juice, monoclonal antibodies to the protein were prepared and an immunoadsorbent column was developed. Sodium dodecyl sulphate-polyacrylamide gel electrophoresis of proteins fixed by the immunoadsorbent reveals the form having a molecular weight of 14,000, in addition to other protein bands which have higher molecular weights (16,000, 16,800, 18,000, and 18,800). All of these different proteins are also recognized by a monospecific polyclonal antibody to the 14,000 molecular weight form. Using the same monospecific polyclonal antibody only one messenger RNA coding for this inhibitor has been demonstrated. Thus, this heterogeneity might be explained by post-translational modifications.

Antibodies, Monoclonal↗
PubMed1985

[Analysis of the electrical activity of the heart and computerization: digital criteria of right bundle-branch block].

The analysis of the electrical activity of the heart has benefitted over the last few years from the development and increased use of computer techniques. It lend itself well to these methods as the data is easily digitalised. The aim of this study was to determine digital criteria of right bundle branch block (RBBB) to facilitate diagnosis mainly when associated with right ventricular hypertrophy and true posterior myocardial infarction. Thirty-two patients (9 women and 23 men) whose electrocardiogram met the conventional criteria of the Wilson type of RBBB were chosen. Their ages ranged from 48 to 84 years (mean: 69 years); all underwent a computerised vectorcardiogram. Frank's X, Y and Z leads were treated by our computer programme. A detailed orthogonal study of the QRS and T wave loops was performed. The following parameters were determined: vectors of special interest (maximal orthogonal vector, maximal vector of the maximal vectors, half-surface vectors); the orthogonal and total surface of the QRS loop; the linear spatial speed.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1985

[Long-term prevention of the recurrence of auricular fibrillation using cibenzoline. Multicenter study apropos of 89 case reports].

The aim of this study was to evaluate the long-term efficacy of cibenzoline in preventing recurrence of atrial fibrillation compared to a reference drug: quinidine arabo-galactane sulfate (QAGS). The two products were administered orally in a double blind multicentre trial to two different groups of patients (96 patients in all) in whom atrial fibrillation had been previously converted to sinus rhythm after having been present for at least 15 days and less than 18 months. The patients were either given four 65 mg gelules of cibenzoline (group I) or four 206 mg gelules of Longacor (group II) and were reviewed systematically after 3 days of treatment, in order to retain only those who had not relapsed during the first 72 hours (89 patients: 42 in group I; 47 in group II). As Holter monitoring was not available in all centres, follow-up was assessed by conventional ECG during clinical examination after 2 weeks, 6 weeks, 3 months and 6 months. The results seem to indicate that cibenzoline was more effective at the 6th month (20% recurrence rate in group I compared to 43.2% in group II). This difference was significant especially at the end of the 2nd week of treatment (p less than 0.04); the number of recurrences did not differ significantly between the two groups thereafter. In general the clinical tolerance was good. Biochemical tests showed a greater increase in serum transaminases (SGOT) in the cibenzoline than in the QAGS group but this difference did not attain statistical significance. We conclude that at 6 months cibenzoline is more effective than QAGS in preventing recurrent atrial fibrillation.

Adult↗
PubMed1985

Evidence of synthesis by Lumbricus terrestris of specific substances in response to an immunization with a synthetic hapten.

Lumbricus terrestris (Annelid, Oligocheta) is capable of cellular- and humoral-specific reactions against natural antigens. Is this earthworm able to elaborate a response of antibody type against a synthetic hapten? L. terrestris have been immunized with conjugates made of one of two different synthetic haptens (400 mw) and a carrier protein: bovine serum albumin (BSA) or keyhole limpet haemocyanin (KLH). The presence of anti-hapten substances in coelomic fluid was tested against each iodinated hapten derivative (125I-hapten). The 125I-hapten-substance complexes were separated from the free derivatives by polyethylene glycol (PEG) 6000 precipitation or by gel filtration. The experiments showed that L. terrestris synthesized specific substances against the immunizing hapten. The importance of the response depended on the carrier protein and on the amount of introduced immunogen. A kinetic study of first and second immunization showed that these substances, elaborated in response to the immunization with the synthetic hapten, were synthesized by cells which kept the immunological memory. These data are discussed in relation to the humoral protection mechanisms already established in the invertebrates.

Animals↗
PubMed1984

Immunohistochemical localization of dopamine in the brain of the insect Locusta migratoria migratorioides in comparison with the catecholamine distribution determined by the histofluorescence technique.

As part of a follow-up study to our previous investigation of the catecholaminergic neurosecretory cells in the brain of adult female locusts (Locusta migratoria migratorioides) by means of the formaldehyde-induced fluorescence method, we have attempted to specify the identity of the amines present in these cells by an immunohistological technique. Using a recently developed anti-dopamine serum, we have demonstrated that the majority of the catecholaminergic median neurosecretory cells contain dopamine. Moreover, dopamine is present in some cell bodies of other zones of the brain, i.e. the median subocellar neurosecretory cells, perikarya in external areas of the protocerebrum, below the calyces, around the pedunculus, in the optic lobes (between the lobula and the medulla, between the medulla and the lamina), and in external zones of the tritocerebrum. Among the structured neuropils, which were particularly fluorescent in the formaldehyde-induced fluorescence method, only the pedunculus, the posterior part of the central body, the external zones of the alpha- and beta lobes and the proximal part of the lamina contain little dopamine.

Animals↗
PubMed1984

A new immunological approach to the detection and the quantitation of the Met5-enkephalin precursors in rat brain.

We describe a new approach to the detection and quantitation of the enkephalin precursor. The approach is based on the production of antibody against a sequential determinant which is obtained specifically and quantitatively from the enkephalin precursor by tryptic hydrolysis. We chose the hexapeptide Tyr-Gly-Gly-Phe-Met-Arg and developed antibody against the C-terminus of this peptide. The hexapeptide is released from the precursor by mere tryptic cleavage. The antibody permits us to detect the Met-enkephalin precursor at the picomole level. Using this approach, we have quantitated the precursor forms in rat striatum and hypothalamus. The precursor/Met-enkephalin ratio was close to 3/4. This result was in very good agreement with the ratio determined previously in the bovine adrenal medulla.

Animals↗
PubMed1984

Antibodies to dopamine: radioimmunological study of specificity in relation to immunocytochemistry.

Two classes of anti-3,4- dihydroxyphenylethylamine (dopamine) antibodies were raised in rabbits using dopamine conjugated to albumin either via formaldehyde or via glutaraldehyde. Each was usable for immunohistochemical detection of dopamine neurons provided that the tissue was fixed by the homologous cross-linking agent. However, anti-dopamine-glutaraldehyde antibodies turned out to be of more general use because of the better fixative properties of glutaraldehyde which fixed dopamine in rat and in teleost, whereas formaldehyde only worked in lower vertebrates (such as goldfish) and not in rat brain. The specificity of anti-dopamine-glutaraldehyde antibodies was firmly established by competition experiments in equilibrium dialysis, using an immunoreactive tritiated derivative synthesized by coupling dopamine to N-alpha-acetyl-L-lysine N-methylamide via glutaraldehyde. Specificity studies in vitro and immunohistological results demonstrating the specific staining of dopaminergic neurons were found to correlate well.

Animals↗
PubMed1984

[Sinoatrial and intra-atrial conductive disorders. The value of recording the sinus node potential].

Direct recording of the sinus node potential in the bipolar mode using two electrodes of a quadripolar recording catheter positioned in the region of the sinus node at the junction of the superior vena cava to the right atrium was performed in 24 patients. Asynchronous overdrive atrial pacing was carried out using Strauss 'technique. Pharmacological denervation was carried out using intravenous propranolol (0,02 mg/kg) and atropine (0,04 mg/kg) using Jose's technique. An intravenous injection of a bolus of 20 mg of ATP was given in 3 cases. The sinus potential was identified by morphological criteria and confirmed after carotid sinus compression and atrial extrastimuli to exclude artefacts, especially the end of ventricular repolarisation of the preceding complex. The sinoatrial conduction time measured directly under basal conditions was considered normal when within 80 to 150 ms. Direct measurement of the sinus potential in the diagnosis of sinus node dysfunction seems to be less useful than the indirect techniques. On the other hand, it does confirm the diagnosis of sinoatrial block: five cases of special interest are described; in four cases the degree of sinoatrial block was variable: a significant increase of sinoatrial conduction time under basal conditions in 1 case; paroxysmal 3rd degree sinoatrial block revealed by programmed atrial stimulation in 2 cases; 2nd degree 2/1 sinoatrial block after injection of ATP in which the direct sinoatrial conduction time and sinus node function had been considered to be normal (1 case).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1982

[1st immunocytochemical application of an anti-dopamine antibody in the study of the central nervous system].

An antibody against dopamine was raised in Rabbits by means of an immunogen constituting dopamine coupled to bovine serum albumin by formaldehyde. These antibodies were applied to frozen sections of Goldfish (Carassius auratus) brain fixed by 4% paraformaldehyde. The localisation of immunoreactive structures corresponded to regions rich in dopamine detected by histofluorescence. The specificity of this antiserum tested with the aid of dopamine analogues coupled with a carrying protein different from that of the antibody, indicates its validity as a method for the detection of dopaminergic neurons.

Animals↗
PubMed1982

Monoclonal antibodies to 5'-triphospho-(2'-5')adenyladenosine oligonucleotides.

Thirteen monoclonal antibodies to ppp(A2'p5')nA oligonucleotides have been produced by fusing Y3 myeloma cells with spleen cells of rat hyperimmunized with A2'p5'A succinyl albumin as immunogen. 125I-labeled A2'p5'A succinyl tyrosine methyl ester was used as a labeled probe. Antibodies were detected by their ability to bind the labeled analog and were selected for their affinity for A2'p5'A. There were no significant differences between the properties of the monoclonal antibodies and of the antiserum. They discriminated between 2'-5' and 3'-5' phosphodiester bonds: they crossreacted poorly with (A3'p5')2A (crossreactivity ratio, greater than 10(4)) and even less with ATP an adenosine (crossreactivity ratio, greater than (6)). The affinity was high (Kd = 6 x 10(-12) M) for succinyl A2'p5'A, which is the best ligand, and also high for A2'p5'A (crossreactivity ratio, 3) and (A2'p5')2A, (A2'p5')3A, and (As'p5')4A (crossreactivity ratio, 7.5). The binding to triphosphorylated isomers, ppp(A2'p5)nA, was affected by the presence of the triphosphate groups, and the affinity increased as the length of the isomer increased (crossreactivity ratio, 10,000 for n = 1 to 200 for n = 4). Thermodynamic analysis of these data demonstrated that, in dephosphorylated isomers, the binding site of highest affinity was located at the 5'-OH end of the molecule whereas in phosphorylated isomers, the favorable binding sites were in the middle and at the 2'-OH end of the chain. Use of monoclonal antibodies of such a specificity together with the 125I-labeled 2-5A analog allows quantification of (A2'p5')nA directly and of ppp(A2'p5')nA after removal of the terminal phosphates by alkaline phosphatase treatment.

Adenine Nucleotides↗
PubMed1982

[Melatonin in the pineal organ, retina and plasma. Immunologic study in the pigeon].

Circadian variations in melatonin content have been studied in the pineal organ, retina and plasma of adult pigeons using radioimmunoassay. A clear-cut peak of melatonin was observed in the pineal organ at middark; this middark peak was of larger amplitude in July than in November. A nocturnal rise in melatonin concentration was also observed in the retina and plasma. We also used an immunocytochemical technique revealing the positive reactions of a melatonin-like compound in the photoreceptor cell layer (inner segments) of the pigeon's retina. Up to now, no melatonin storage has been visualized in the pineal organ of the pigeon.

Animals↗
PubMed1982

[Posterobasal infarction and right bundle branch block: value of computerized vectorcardiography].

The object of this study was to determine the vectocardiographic criteria of posterobasal myocardial infarction associated with right bundle branch block. Seventeen patients were examined; all had clinical and enzymatic evidence of myocardial infarction, associated with the unusual appearances of right bundle branch block with an isolated R wave in V1 and V2. The Frank X, Y, and Z axes were treated by computer to obtain a detailed octonal study of the QRS and T loops. Vectors of special interest were determined: the maximum maximorum vector and the QRS half surface vector (module, azimuth, elevation, appearance time). The octonal and total surface are of the QRS and T loops and the spatial angle of the maximal vectors of the two loops were calculated. These cases were characterised by clockwise rotation of the QRS loop in the horizontal plane. The maximal QRS vector had a decrease module (1,29 mV +/- 0,49), an azimuth greater than 20 degrees (42,8 degree +2- 20,3) an appearance time of 55,7 +/- 12,1, and an elevation which was either positive or negative depending on the presence or absence of an associated left anterior hemiblock. The half-surface vector was superimposed on the maximal vector: module (1,09 mV +/- 0,39), azimuth (45,2 degrees 23,5(and appearance time (62,0 +/- 11,7 ms). The posterior surfaces were nil or negligible (less than 1 p. 100). The T loop had a clockwise rotation in the horizontal plane and its maximal vector projected anteriorly in 8 patients. The appearances observed in these 17 cases were different to those of isolated right bundle branch block. The classical causes of anterior ORS loops could be excluded easily: right ventricular hypertrophy, Wolff-Parkinson-White syndrome, intraventricular conduction defect. The following criteria were retained in the diagnosis of posterobasal infarction associated with right bundle branch block:--principally, clockwise rotation of the QRS loop in the horizontal plane;--anterior displacement of the maximal vector with an azimuth of over 20 degrees;--disappearance of the posterior forces;--associated with the usual criteria of right bundle branch block;--clockwise rotation of the T wave loop in the horizontal plane.

Bundle-Branch Block↗
PubMed1981

Wolff-Parkinson-White syndrome: T wave abnormalities during normal pathway conduction.

Forty-five patients with Wolff-Parkinson-White syndrome (WPW) were reviewed. The preexcitation using Boineau's classification was: right anterior (six patients), left lateral (nine patients), right posterior (15 patients) and left posterior (15 patients). Normal pathway conduction was observed to occur either spontaneously or after administration of ajmaline, procainamide, or by eye-ball pressure. Disappearance of preexcitation was associated with T wave abnormalities in 39 patients (86.6%). The orientation of the T spatial vector (SAT), after suppression of the WPW aspect, varied according to the site of ventricular preexcitation. In eight patients with left lateral ventricular preexcitation (LLVP), the frontal T wave axis was between +70 degrees and +120 degrees (mean +92 degrees) and the horizontal T wave axis was located in the left anterior quadrant. In the five patients with right anterior ventricular preexcitation (RAVP), the frontal axis was between + 40 degrees and - 10 degrees (mean + 26 degrees) and the horizontal axis was in the left posterior quadrant. The 26 cases with right posterior ventricular preexcitation (RPVP) and left posterior ventricular preexcitation (LPVP) had a frontal axis between - 10 degrees and - 70 degrees (mean -39 degrees) and the horizontal T wave axis in the left anterior quadrant. This study suggests that the T wave anomalies observed after suppression of the WPW aspect are in direct relation to the localization of the preexcitation according to Boineau's classification. The analogy between the abnormalities of the T wave and those which are observed after right ventricular pacing (VP) or after disappearance of left bundle branch block (LBBB) is discussed.

Adolescent↗
PubMed1981

Influence of parathyroid status of rats on renal tubular handling of adenosine 3'5'-monophosphate: a micropuncture study.

In order to correlate cyclic AMP handling by the nephron to the parathyroid status, clearance and micropuncture experiments were performed in rats with intact parathyroid glands, or immediately after parathyroidectomy, or six days after parathyroidectomy. In intact animals cyclic AMP urinary excretion was about twice the filtered load and the tubular addition of the nucleotide was achieved at the end of the accessible proximal tubule. In acutely parathyroidectomized rats cyclic AMP urinary excretion was not different from the filtered load and no proximal tubular addition was detected at the late accessible proximal tubule. In chronically parathyroidectomized animals urinary excretion of cyclic AMP was not different from the filtered load, nevertheless a proximal tubular addition of the nucleotide was observed, similar in magnitude to that of intact rats. The data afford a direct evidence that the convoluted proximal tubule is the major site of cyclic AMP tubular addition, confirm that this addition disappears immediately after parathyroidectomy, but indicate that it re-occurs in chronic parathyroidectomy.

Animals↗
PubMed1976

[Gap phenomenon and supranormal conduction during intermittent left bundle-branch block].

The mechanism of intermittent bundle branch block, whether spontaneous or as a result of vagal stimulation, can be studied by reference to the known facts of atrial stimulation. Three cases with intermittent left bundle branch block were studied by means of an intracavitary electrode, which allowed the potential of the bundle of His to be measured, and was also used for the extrastimulus method of study. In case 1, in which the block was independent of the cardiac rate, a type 1 "Gap" phenomenon (of nodal origin) was demonstrated; the coupling zone in which the extrastimulus overcame the block was situated in two areas, one being late, and the other earlier in a region where the conduction was normal. In case 2, in which the block was dependent upon the heart rate, the "recovery" of the blocked branch after early coupling of the extrastimulus seemed to be associated with the phenomenon of "supra-normal" conduction. In case 3, in which the block was again dependent upon heart rate, the two phenomena of "Gap" and "suppranormality" seemed to act successively when the coupling of the extrastimulus is decreased progressively. These observations allow us to distinguish two types of intermittent left bundle branch block; one, which is not related to heart rate, is characterised by a prolonged refractory period of the left bundle branch, which becomes progressively shorter as the heart rate increases; the other, which is dependent upon tachycardia, is characterised on the one hand by an increased left bundle branch refractory period which does not shorten as the heart rate increases, and on the other by the phenomenon of supranormal conduction.

Bundle of His↗
PubMed1975

[Study of sinus node function. Preliminary results].

Direct exploration of the sinus node remains experimental. Indirect techniques have been put forward to assess the sinus function in man: high frequency atrial pacing; premature atrial pacing; pharmacodynamic tests using atropin and isoproterenol injection. 68 patients were so explored: in 10 of them were ECG signs suggestive of "sinus disease" or "atrium disease" (group I); 14 subjects had only a sinus bradycardia with a rate of 55/mn or below (group II); in 16 cases, the ECG tracing was normal, but there was the notion of paroxysmal tachycardia or various disturbances (group IIIa); finally, in 28 cases the ECG demonstrated atrio-ventricular or inter-ventricular conduction disturbances (group IIIb). The preliminary results reported here should be interpreted carefully; nevertheless, correlation of the data obtained by the various techniques used, seems to be able to allow a correct assessment of sinus automatism, and of sino-atrial conduction.

Adult↗