Biomedical subjects
J Clot
Publications and source records attributed to J Clot.
Immunomodulation induced by Avène spring water on Th1- and Th2-dependent cytokine production in healthy subjects and atopic dermatitis patients.
Avène spring water (ASW) is commonly used in France for treating atopic dermatitis and psoriasis. Previous works demonstrated modulation of cell membrane fluidity by ASW. The aims of the present study were (a) to investigate a possible in vitro effect of ASW on Th1- and Th2-dependent cytokine production using peripheral blood mononuclear cells from healthy individuals and (b) to investigate both the in vitro effect of ASW on AD patients' cells and the in vivo cellular and clinical modifications induced by a 3-week Avène Medical Spa water cure (AMSWC). The effect of ASW was tested on lymphocyte cultures, which were stimulated in vitro by various mitogens and a superantigen of staphylococcal origin. The lymphocyte proliferation and the production of the cytokines IL-2, IL-4 and IFN-gamma were tested. The results showed that ASW-containing medium enhanced the lymphoproliferative response to some mitogens. IL-2 and IFN-gamma production were also increased in stimulated culture supernatants. Conversely, ASW-containing medium induced a decrease in IL-4 production by normal peripheral blood lymphocytes. Furthermore, AMSWC was able to amend the clinical features as well as the immunological Th2 profile of atopic dermatitis.
[Letter: Deficit of T-lymphocytes in psoriasis].
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[Immunologic disturbances in psoriatic arthropathy (author's transl)].
It was observed in 51 cases of psoriatic arthropathy (PA) an increase of blood IgA and a decrease of IgM, a not significant rise of the level of circulating immune complexes, a positive Waaler-Rose reaction in 9.7% of cases and the presence of antigammaglobulin factors (generally of IgG type) in 55,5% of studied patients. Moreover, it was noted a significant decrease of T lymphocytes as detected by E and "active" E rosettes, of EA-gamma rosettes (ox erythrocytes) and an increase of the percentage of high avidity Fc-gamma receptor bearing cells. Lymphocytes responses to mitogens were normal or slightly decreased for Concanavalin A. No correlation was found between the immunological data and the clinical features.
[The operating room nurse and the patient with peritonitis].
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[IgE and cellular immunity in cutaneous lymphomas (author's transl)].
Serum IgE levels were measured (radioactive radial diffusion or radioimmuno assay) in 21 patients (14 mycosis fungoides or premycosis fungoides and 7 other lymphomas) and 1,019 controls. Elevated IgE levels (greater than or equal to 500 UI/ml) were found in 57 p. 100 of patients and 8,1 p. 100 of controls. The most important increase was noted in mycosis fungoides. Moreover, some of these patients showed a cellular immunity impairment: negative delayed skin tests, low percentage of T-lymphocytes forming E rosettes (2 out of 4 patients), decreased mitogenic response to Con A and P.H.A. In one patient with Sézary syndrome there was a dissociation between E and E active rosettes (low values) and anti H.T.L.A. serum (high values). This result could indicate that the Sézary cell is a poorly differentiated T-lymphocyte.
[Acute lymphoblastic leukemia in children. The use of antisera specific for lymphocyte populations in a classification trial].
Mononuclear cells from 14 children with acute lymphoblastic leukaemia (ALL) were studied using several lymphocyte membrane markers: E-rosettes, "active" E-rosettes, surface immunoglobulins, EA-rosettes. The use of these techniques and of three specific heterologous antisera directed against T and B cell antigens enabled the discrimination of three different ALL types according to the stage of cell maturation at which it is likely that neoplastic differention occured: T-cell ALL, pre-thymic cell ALL, and "non-T non-B" cell ALL showing only HLA-DR antigens.
[Involvement of lymphocyte populations in rheumatoid synovial lesions].
T and B lymphocyte proportions have been studied in synovial fluid and peripheral blood from 70 patients with classical or definite rheumatoid arthritis (RA). The results have shown that T-cell numbers assessed by E-rosettes and anti-HTLA antiserum, B-cell numbers detected by membrane immunofluorescence and EAC-rosettes from peripheral blood were similar in RA and in a control group. Conversely, "active" E-rosettes which detected a subset of mature T cells, were decreased in blood and very increased in synovial fluid. Furthermore, the percentages of mononuclear cells bearing a Fc-receptor for IgG (EA-rosettes) were higher in synovial fluid than in RA peripheral blood. These data could be in favour of the cell-mediated immunity in rheumatoid arthritis lesions.
[Evaluation of thymic hormone and E-rosettes in patients with IgA deficiency].
We have investigated lymphocyte subpopulations and T cell functions, in particular E rosettes and serum level of thymic factor in ten young patients (aged 6 to 20) with partial and selective IgA deficiency. The control group included ten age-matched healthy subjects. Significantly depressed levels of serum thymic factor were found in six patients. These results were correlated with the decreased number of E rosettes found in five of them, and support a T-cell involvement in IgA deficiency.
[Treatment of rheumatoid polyarthritis with IgG eluted from the placenta. Results of an open study on 31 patients].
Thirty-one patients presenting classical or defined, severe and active rheumatoid polyarthritis (RP) unresolved by most of the usual basic treatments (due to inefficacy or safety problems) were treated with human placental IgG preparations (HPIgG) in an open study. Various therapeutic protocols were tested to determine the most efficacious dosage. Favorable results were noted in 62% of cases. Improvement was generally rapid, often occurring after the first week of treatment. Rheumatoid nodules subsided by more than 50% and were resolved in two of nine cases. A decrease in dosage of analgesics or anti-inflammatories was possible in seven of 31 cases. Remission of RP of duration exceeding six months after withdrawal of HPIgG treatment was noted in six of 18 favorable results (33.3%). Best results were seen with intravenous administration of 1,500 mg per day seven days per month. No clinical or immunological effects were seen in a control group treated with venous globulins (1,500 mg/day for seven days). Safety was very satisfactory: four withdrawals from treatment due to proteinuria (3 cases) or phlebitis (1 case); these adverse reactions subsided rapidly. Immunostimulation of lymphocyte function was seen in all patients treated with HPIgG. The mode of action of HPIgG is currently under study. HPIgG may act as polyspecific antibodies against class II HLA antigens thus opening up the possibility of a new type of therapeutic immunomodulation in man.
[Prolymphocytic leukemia of T-cell type. Clinical, cytological, cytochemical and immunological studies (author's transl)].
Prolymphocytic leukaemia (PL) is a rare variant of lympho-proliferative disorder, defined by Galton [21], which differs clearly from CLL by clinical, haematological and immunological features. Nevertheless like CLL, PL appears to represent predominantly a B cells monoclonal proliferation and cases of T-PL are rare. We report about another case of PL which was found to have T-lymphocyte characteristics and some clinical and immunological particularities.
Immunological abnormalities in psoriatic arthropathy.
Immunological parameters were studied in 25 cases of psoriatic arthropathy. We found in the peripheral blood an increase of IgA, a decrease of IgM, and low conentrations of immune complexes. Anti-gammaglobulin factors, mainly of the IgG class, were detected by indirect immunofluorescence in 55.5% of cases. The study of lymphocyte membrane markers showed a decrease of T cells as investigated by E and "active" E-rosettes, a decrease of EA gamma-rosette-forming cells, and an increase of "high avidity" EA-rosettes. Lymphocyte responses to phytomitogens were normal. There was no correlation between the clinical data and the immunolgical features.