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Biomedical subjects

A Le Treut

Publications and source records attributed to A Le Treut.

At least 19 recordsLinked to original sources
PubMed1992

Anonymous markers located on chromosome 6 in the HLA-A class I region: allelic distribution in genetic haemochromatosis.

Two yeast artificial chromosomes of the HLA class I region were subcloned. Four of the subclones studied displayed restriction polymorphisms that corresponded to six bi-allelic series. Allelic distribution of the anonymous markers was then studied by comparing a control population with a group of patients with familial haemochromatosis. Only one marker presents an unequivocal association with the haemochromatosis gene and is 100 kb centromeric to HLA-A. This association however is not as strong as with HLA-A3. The results suggest two possible locations for the haemochromatosis gene: less than 100 kb centromeric to the HLA-A locus, or on the telomeric side.

Alleles↗
PubMed1992

[Breast microcalcifications].

Microcalcifications of the breast are better recognized as the quality of mammographs is improving. The clinical examination and complementary modalities are often essential to evaluate their significance and point out to an indication for surgery. However, especially when the microcalcifications are detected during a systematic examination, a strict analysis of mammographs is essential. The number of useless punctures must be reduced, as their psychological impact and socioeconomic weight are already demonstrated. Although there is no consensus, most recent publications contain ideas converging on the selection of the indications for a histological control on the basis of an accurate semiological study.

Breast Diseases↗
PubMed1992

[Extramammary carcinoid tumor metastatic to the breast. Apropos of a case].

We report the case of a 42-year-woman treated for an appendicular carcinoid tumor with bilateral ovary metastases and mesenteric node involvement. After a systematic mammography, an infraclinical lesion of the breast was detected. Mammographic and echographic images revealed nodular mass with possibly malignant features. Fine-needle aspiration biopsy indicated malignancy. The definitive diagnosis of breast metastasis of a carcinoid tumor was made by biopsy. This case is related to 14 previously published cases. The authors emphasize the importance of making a precise histological diagnosis to avoid overtreatment of a metastatic lesion.

Adult↗
PubMed1991

Metastases to the breast: differential diagnosis from primary breast carcinoma.

Eight patients with breast metastases from primary tumors other than breast carcinoma were studied: 3 malignant melanomas, 2 rhabdomyosarcomas, 1 malignant mesothelioma, 1 appendiceal carcinoid, and 1 epidermoid cervical carcinoma. All had mammographic, histopathologic, and immunohistochemical examinations. The main problem was differential diagnosis from primary breast carcinoma. History of extramammary primary tumor was helpful but breast metastasis was the first clinical feature in 2 cases. Patients had noticed palpable, round, rapid growth masses which were mammographically benign. Pathologic diagnosis was difficult and immunohistochemical studies necessary, whenever the proliferation had histologic features of primary breast carcinoma or when no primary tumor was known. However, some histologic features were of value for diagnosis of metastasis: atypical histologic features for a primary breast carcinoma, a well-circumscribed tumor with multiple satellite foci, the absence of an intraductal component, and the presence of many lymphatic emboli. In adults, the most frequent types of tumors metastasizing in the breast are malignant melanoma and neuroendocrine-like tumors, especially small cell carcinoma and carcinoid. In children, rhabdomyosarcoma is the most common. Accurate diagnosis of breast metastasis is important to avoid unnecessary mastectomy and to implement an appropriate systemic therapy.

Adolescent↗
PubMed1989

Biochemical aspects of alpha-L-fucosidase in hepatocellular carcinoma.

Biochemical characteristics of alpha-L-fucosidase (alpha-L-fucoside hydrolase, EC 3.2.1.51) were studied in tumorous and nontumorous human hepatocellular carcinoma (n = 14). Five parameters were studied: (i) specific activity, (ii) thermostability, (iii) enzyme affinity for an artificial substrate (Km), (iv) isoenzyme patterns of the glycosidase before and after neuraminidase treatment and (v) pH influence on enzyme activity. The specific activity of alpha-L-fucosidase was significantly decreased in tumoral liver when compared to nontumoral liver. The curve of pH activity constantly showed a broad optimum centered near pH 5, whereas two optima were always observed in nontumoral areas. In contrast, there was no modification of the thermostability, the substrate affinity and the isoenzyme patterns of alpha-L-fucosidase in hepatocellular carcinoma.

Adenoma↗
PubMed1989

Pathophysiological variations in the rat liver plasma membrane serine proteinase activity.

The effects of fasting, diabetes, cholestasis, two-third hepatectomy and adrenalectomy on the rat liver plasma membrane serine proteinase activity were studied. Our results show a significant decrease of the enzyme activity during fasting (-50%), during experimental diabetes (-50%), in regenerating liver after partial hepatectomy (-70%) and after extrahepatic cholestasis (-70%). No modifications are noted when the rats are bilaterally adrenalectomized. These findings suggest that the enzyme activity may be linked to the level of circulating insulin, and may be regulated in physiological cellular proliferation so as to prevent undesirable protein degradation.

Adrenalectomy↗
PubMed1989

[Diagnosis of bilateral secondary tumors of the kidney. Contribution of cytology. Apropos of 2 cases].

The authors report bilateral secondary tumors of the kidney in two patients: one previously treated for an epidermoid tumor, the other for an anaplastic bronchial tumor. In both patients, clinical and radiological features were those of a malignant process. Scan-guided percutaneous fine needle aspiration provided the material necessary to make a definitive cytological diagnosis; it was thus possible to assess the malignancy and recognize the histological type of lesions.

Adult↗
PubMed1989

Effects of perhexiline maleate on asialo-orosomucoid receptor endocytosis and recycling in HTC cells.

Perhexiline is a lysosomotropic agent which has proved to be very valuable to certain patients suffering from angina pectoris. However long-term administration of the drug may induce hepato- and neuro-toxicity. Using HTC cells (a rat hepatoma-derived cell line) whose plasma membranes were labeled with NaB[3H]4 after oxidation by NaIO4, endocytosis and recycling of labeled asialo-orosomucoid (ASOR) receptors were investigated in the presence of 50 mumols/l perhexiline maleate. The results demonstrate that the drug induces a significant decrease of the rate of both the internalization and the recycling of ASOR receptors. The mechanisms responsible for these effects have not yet been elucidated. However, the current findings may be related to the previously observed inhibitory effect of perhexiline on cellular (Na+, K+)-ATPase and Mg++-ATPase activities. Our findings would then reflect insufficient cellular energy production, resulting from depressed ATP hydrolysis in the presence of perhexiline.

Animals↗
PubMed1989

[Adrenal myelolipoma and Castleman's pseudotumor. A case of association in a retroperitoneal tumor].

The authors report a case of a voluminous retroperitoneal tumor as an incidental finding in a patient with acute urine retention induced by an ovarian compressive cyst. Radiological findings supported the hypothesis of a malignant tumor. The histological examination of the surgical specimen only permitted the diagnosis and showed the association of an adrenal myelolipoma with a Castleman's pseudo-tumor.

Adrenal Gland Neoplasms↗
PubMed1988

Inhibition of (Na+,K+)-ATPase and Mg++-ATPase by a lysosomotropic drug: perhexiline maleate.

Human clinical observations and in vivo studies have shown that the amphiphilic drug perhexiline maleate is responsible for lipidosis storage disorders. When the drug was incubated in vivo with rat brain homogenates, the ouabain-sensitive (Na+,K+)-ATPase and the Mg++-ATPase activities were inhibited. 50% inhibition occurred at the drug concentrations 5.10(-5) M for (Na+,K+)-ATPase and at 10(-4) M for Mg++-ATPase, respectively. Kinetic studies performed on rat brain homogenates showed a mixed type inhibition of these enzymes by perhexiline maleate. The effect of other lysosomotropic drugs (imipramine, chlorpromazine, thioridazine and tamoxifen) on (Na+,K+)-ATPase and on Mg++-ATPase activities was found to be similar to that induced by perhexiline maleate. These results indicate that the inhibitory effect of perhexiline maleate on (Na+,K+)-ATPase and Mg++-ATPase may be a common feature shared by the lysosomotropic drugs.

Animals↗
PubMed1979

[Spectrophotometric assay of angiotensin I-converting enzyme (author's transl)].

The method of chemical assay of angiotensin I-converting enzyme described is a modification of the previously published spectrophotometric assay based on quantitation of hippuric acid released from hippuryl-L-histidyl-L-leucine. The new procedure involves extraction of hippuric acid with ethylacetate, evaporation to dryness of the extract, solubilization of the residue with 1 mol/l NaCl and purification with petroleum ether before measurements of the absorbance at 228 nm of the aqueous phase. Under these conditions, hippuric acid insoluble in petroleum ether remains in the aqueous phase, whereas other A228-absorbing materials, readily soluble in the ether and able to interfere with the assay, are eliminated.

Hippurates↗
PubMed1979

Genetic polymorphism of alpha-L-fucosidase in Brittany (France).

The authors studied the phenotypic distribution of alpha-L-fucosidase in a random sample of the population of the area of Rennes (France). The frequencies of Fu1 (0.64) and Fu2 (0.36) genes are significantly different from the frequencies observed in New York whites and blacks.

Adolescent↗
PubMed1979

Lymphography in angio-immunoblastic lymphadenopathy.

Angio-immunoblastic lymphadenopathy (AIL) produces a characteristic lymphoproliferative syndrome, with characteristic lymphographic appearances. The authors studied the lymphographic manifestations of 18 cases of AIL. In 15 out of 18 cases, enlargement is observed in all the lymph nodes with a lacy or reticular storage pattern and sharp, well delimited margins. This lymphographic appearance reflects the histologic changes; only the peripheral sinuses, which are not involved, can be observed on lymphography.

Adult↗
PubMed1979

[Radiological study of the chest involvement during angioimmunoblastic lymphadenitis (A.I.L.) Twenty observations (author's transl)].

From 20 observations, the authors worked out the frequency and the radiological picture of chest localizations of angio-immunoblastic lymphadenitis (A.I.L.). There are 2 kinds of pulmonary involvement: --a specific one by interstitial immunoblastic infiltration (20 to 45% of cases) and showing on X ray a reticulomicronodular interstitial syndrome; --a secondary infection (33% of cases) often the cause of death. Pleural involvement is unfrequent (11% to 25% of cases) and its onset late. Mediastinal lymph-node involvement is found in 37 to 50% of cases. It is usually discovered straight away.

Adult↗
PubMed1979

[Genetic polymorphism of erythrocytic enzymes in the Rennes area. Frequency of adenylate kinase, esterase D, adenosine deaminase, 6-phosphogluconate dehydrogenase, glutamate-pyruvate transaminase and glyoxyalase I phenotypes].

Blood donors from the Centre Régional de Transfusion Sanguine de Rennes were investigated for the phenotypic distribution of seven enzymatic systems : adenylate kinase, adenosine deaminase, esterase D, 6-phosphogluconate dehydrogenase, glutamate-pyruvate transaminase, phosphoglucomutase, and glyoxalase I. Two unusual phenotypes were observed: phenotype 6-1 for adenosine deaminase and phenotype 3-1 for transaminase GPT. For five of these enzymes, the statistical analysis points out significant differences in one or several of the European populations described in the literature.

Adenosine Deaminase↗