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Biomedical subjects

J Sampol

Publications and source records attributed to J Sampol.

90 records · Page 5Linked to original sources
PubMed1987

[Lymphocyte phenotyping in the cord blood of newborn infants].

Ontogeny and development of phenotypically defined T-cell subsets in humans, are the source of controversy. Cord blood represents a relevant model for the study of the normal T-cell differentiation pathway. We identified T lymphocytes subsets with monoclonal antibodies (Mab) in human cord blood and adults controls in an indirect immunofluorescence assay and B lymphocytes in a direct immunofluorescence assay. No difference was noted between the two populations with followed Mab: CD3-CD4-CD8-HLA class II-IL2 receptor, with a normal ratio CD4-CD8. The percentage of CD2+ cells was lower in neonatal blood. Double labeling studies characterized a lymphocyte population CD4-CD8 positive. This study revealed absence of immature T cells with CD1 monoclonal antibodies.

Antibodies, Monoclonal↗
PubMed1986

[Determination of factor X Ag by laser immunonephelemetry].

A method of dosage of X Ag factor by laser immunonephelemetry is proposed. This technique, carried out with a rabbit antiserum in the presence of PEG and EDTA, presents the advantage to be sensitive, reproducible and mostly faster than the other immunological methods, such as Electroimmunodiffusion (EID) and Enzyme Linked Immuno-Sorbent Assay (ELISA). It constitutes a simple tool, applicable in the demonstration of an enzyme dysfunction or liver pathology. Finally, it could bring a supplement of information in monitoring antivitamin K therapy.

Antigens↗
PubMed1986

[Detection of intracytoplasmic immunoglobulins by cytofluorography].

In this report the authors describe a method of cell permeabilisation compatible with flow cytometry. To maintain cell integrity, lysolecithin is used. This method is simple, rapid, and reproducible. Control tests demonstrated no non-specific fluorescence due to lysolecithin treatment. This technique was used in several cases of chronic lymphocytic leukemia to detect intracytoplasmic immunoglobulins and monoclonality and in one case of multiple myeloma.

B-Lymphocytes↗
PubMed1984

[Influence of chronic smoking on leukocytes].

The authors showed a significant increase in total leukocyte count (2p less than 0.001), neutrophil concentration (2p less than 0.001) and lymphocyte concentration (2p less than 0.01) in 21 chronic smokers compared to 22 non-smokers. However, only the total leukocyte count and the neutrophil count proved to be correlated to carboxyhemoglobin saturation. Slightly different hypotheses are proposed to explain the increase in leukocyte count: the carbon monoxide and/or the carboxyhemoglobin acts directly on peripheral blood leukocytes or indirectly, via the adrenalin secretion. The average leukocyte count in smokers corresponds to the upper borderline in nonsmokers; therefore, it seems pertinent to take into consideration the number of cigarettes smoked per day when assessing a smoker's leukocytosis.

Carboxyhemoglobin↗
PubMed1984

[Automatization of heparin determination using chronometric evaluation of anti-Xa activity of the AT III-heparin complex].

The authors describe an adaptation on a semi- automatique coagulometer KC 10 of a manual assay of anti-Xa activity of the Heparin-Antithrombin III Complex close to the technique described by Yin and al. ( Hepaclot - Stago ). The results show a good linearity and a good reproducibility, with a better sensitivity than the manuel method. Freezing has no influence. Significant differences were observed between our assay and the manuel anti-IIa assay. These last results neither depend on the administration route nor on the heparin batches.

Antithrombin III↗
PubMed1983

A rapid and simple assay for the study of thromboxane B2 synthesis by intact human platelets.

Conversion of 1-14C-arachidonic acid (AA) to thromboxane B2 (TXB2) by human platelets was studied by using a new, simple technique. Organic solvent extraction was avoided by spotting aliquots of the reaction mixture directly on thin layer chromatography (TLC) plates. In this way it was possible to study the kinetic parameters of the formation of TXB2. Moreover, the rapidity and simplicity of the assay should be particularly suitable when studying the possible relationships between thromboxane synthesis and aggregation function in human platelets, where a large number of determinations is required.

Blood Platelets↗
PubMed1983

Factor VIII related antigen, coagulation tests and acute renal failure.

Coagulation factors were measured in 50 patients presenting with acute renal failure on the day of their admission (D1) and seven days later (D7). A number of changes were observed, particularly in those patients with a poor prognosis (decreased platelet counts and plasminogen concentrations and increased factor VIII related antigen concentrations). In the majority of cases it would appear that disseminated intravascular coagulation remains sub-clinical.

Acute Kidney Injury↗
PubMed1978

Treatment of venous thrombosis and pulmonary embolism by streptokinase.

We applied the standard treatment with streptokinase to 52 cases of deep venous thrombosis and 35 cases pulmonary embolism. Angiography demonstrated total lysis of the clot 22 times, partial lysis 42 times, and no lysis 23 times. The absence of lysis was more frequent in venous clots than in pulmonary clots. Early treatment was more effective, achieving complete lysis in 21 of 22 cases. Nevertheless, in deep venous thrombosis, late treatment can result in partial lysis and set an important venous junction free. With the standard treatment, the biologic controls showed good lysis in 75% of the cases, insufficient lysis in 15%, and no lysis in 10%. The extent of the thrombosis is an important point. The clot was totally lysed in 9 of 10 cases of localized deep venous thrombosis. In patients with pulmonary embolism, about 30% of the obstructed surface is cleared. Nevertheless, in such cases we must take into consideration not only the nonperfused pulmonary area, but also the venous starting point of the clot.

Adult↗
PubMedDate not supplied

Role of Kaposi's sarcoma cells in recruitment of circulating leukocytes: implications in pathogenesis.

OBJECTIVE: We sought to identify and characterize mechanisms of interaction between Kaposi's sarcoma cells and circulating leukocytes leading to leukocyte migration into the lesion. STUDY DESIGN/METHODS: By using static and dynamic adhesion models, we measured the ability of late-stage KSY1 cells to support adhesion and transmigration of peripheral blood lymphocytes (PBL). RESULTS: We showed that resting as well as TNF-alpha- or PMA-activated KSY1 cells supported adhesion and transmigration of PBL with a higher efficiency compared with normal endothelial cells. The LFA1/ICAM1 pathway was totally involved in PBL adhesion to resting or TNF-alpha-activated KSY1 cells and partially responsible for adhesion to PMA-activated KSY1 cells. No inhibition of adhesion was observed by blockage of the VLA4 pathway. Under flow conditions, PBL/KSY1 cell interaction was totally dependent on L-selectin. CONCLUSION: Our data indicate that KS cells mimic an endothelium-like structure by regulating extravasation of lymphocytes into lesions.

Cell Aggregation↗