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Biomedical subjects

J Charreire

Publications and source records attributed to J Charreire.

At least 73 records · Page 4Linked to original sources
PubMed1984

Syngeneic sensitization of mouse lymphocytes on monolayers of thyroid epithelial cells. VI. Evaluation of its frequency using the limiting dilution analysis.

The determination of the frequency of normal spleen cell involvement in Primary syngeneic sensitization (PSS) against thyroid epithelial cells (TEC) was performed using the limiting dilution analysis. It was found that their frequency, which reaches 1:5440, is related to the expression of major histocompatibility complex (MHC) antigens (K end or D end) and of the specific antigen thyroglobulin (Tg) exposed on the surface of the TEC monolayer. Moreover, a significant diminution of this frequency was obtained by the addition of 25% normal syngeneic lymph node (LN) cells.

Animals↗
PubMed1984

Effect of carbimazole treatment on specific and non-specific immunological parameters in patients with Graves' disease.

Twenty-two patients with newly diagnosed Graves' disease (GD) were treated with carbimazole (CBZ) for 6 months. Thyroid stimulating immunoglobulins (TSI) and T cell subsets were studied prior to treatment and after 3 and 6 months of therapy. TSI were measured on human thyroid epithelial cell monolayers by the cAMP production after the addition of highly purified GD IgG. Before treatment, serum IgG from 20 out of the 22 patients (91%) stimulated cAMP production significantly compared to normal IgG. The mean index of cAMP production (GD IgG relative to normal IgG) was 2.15. After 3 months of CBZ treatment, a non-significant decrease of the mean cAMP production index was observed, whereas it was significantly decreased at the end of the 6 month course of therapy. Before treatment, total T cells (OKT3+), helper/inducer T cells (OKT4+) and suppressor/cytotoxic T cells (OKT8+) were all significantly decreased compared with controls. After 3 or 6 months of CBZ therapy, both total T cells and helper/inducer T cells returned to a normal level, while cytotoxic/suppressor T cells remained at the same low level. Taken together, these data indicate that treatment with CBZ leads to an early increase of helper/inducer T cells followed 3 months later by a decrease of the TSI level with no change in decreased suppressor/cytotoxic T cells. The disappearance of TSI following the increased helper/inducer T cell level suggests that an anti-idiotypic reaction may have occurred, and the persistent decrease of the suppressor/cytotoxic T subset that CBZ therapy does not act upon the underlying autoimmune disease.

Adult↗
PubMed1983

[Study of thyroid autoimmunity in man. Contribution of cell cultures to the study of antibodies stimulating the thyroid gland in Basedow's disease].

The value of thyroid cell cultures in vitro has been demonstrated in auto-immune thyroiditis in animals. We have used the same method in man to investigate for serum thyroid-stimulating antibodies (TSAb) by measuring cyclic AMP production in thyroid cell cultures incubated with immunoglobulins from patients with Graves' disease. The specificity of the reaction is strictly directed either against TSH or against immunoglobulins from patients with Graves' disease; 92% of the sera of our untreated Graves' disease patients were positive. The value of this technique compared to the other methods used for detecting TSAb is discussed.

Adolescent↗
PubMed1983

Syngeneic sensitization of mouse lymphocytes on monolayers of thyroid epithelial cells. V. The primary syngeneic sensitization is under I-A subregion control.

The genetic control of in vitro primary syngeneic sensitization on monolayers of thyroid epithelial cells was investigated both at the level of the responder lymphocytes and that of stimulator thyroid epithelial cells using congenic resistant strains of mice. It clearly appears that similar to the in vivo model of experimental autoimmune thyroiditis induced by thyroglobulin and complete Freund's adjuvant, the optimal stimulation is found when compatibility between thyroid epithelial cells and responder lymphocytes occurs at the I-A subregion.

Animals↗
PubMed1983

Syngeneic sensitization of mouse lymphocytes on monolayers of thyroid epithelial cells. IV. Correlation with H-2 haplotypes.

In vitro primary syngeneic sensitization on monolayers of thyroid epithelial cells was performed with 21 inbred strains of mice representing 11 original H-2 haplotypes. Significant differences in the proliferative responses, assessed by thymidine uptake, were found to be related to the major histocompatibility complex haplotype. This result was further confirmed using congenic resistant strains of mice. In comparison with the experimental autoimmune thyroiditis induced by syngeneic thyroglobulin and adjuvant, primary syngeneic sensitization on monolayers of thyroid epithelial cells appeared to be under the same genetic control (H-2k strains being good responders, while H-2b mice are poor responders).

Animals↗
PubMed1983

Lymphoid cells from the rodent Praomys (Mastomys) natalensis express antigenic determinants present on mouse and rat lymphocytes.

Recent studies have suggested that Praomys (Mastomys) natalensis might be a suitable model for analyzing the underlying mechanisms of autoimmunity, since a high incidence of autoantibodies to a wide variety of specificities occurs in this rodent which is intermediate in size between the mouse and the rat. Mastomys, also called the "multimammate mouse" or "multimammate rat", more closely resembles the rat than the mouse as regards some anatomical traits, and differs from both common rodents as to others. Because of controversies many years ago, Mastomys was never phylogenetically classified as a genus, but remains a subgenus, designated Praomys (Mastomys) natalensis. We have attempted to determine whether immunological markers differentiated on mouse or rat lymphocytes are present on Mastomys lymphoid cells. It was demonstrated that Mastomys cells (thymus, spleen, lymph node, bone marrow) bear theta determinants of both mouse and rat, express mouse membrane Ig, and bind with anti rat Ia antigens (which cross-react with mouse specificities). Functional markers (helper or suppressor/cytotoxic functions of the mouse or rat) were never found on Mastomys lymphoid cells.

Animals↗
PubMed1983

Expression of H-2 antigens and thyroglobulin (Tg) on freshly dissociated and in vitro cultured monolayers of mouse thyroid epithelial cells (TEC).

The expression of the major histocompatibility complex antigens (K, D, and Ia) and thyroglobulin was studied on both freshly dissociated and in vitro cultured murine thyroid cells. Methods used for antigen detection included direct cytotoxicity, fluorescence and electron microscopic studies. Results obtained showed that the K-end, the D-end and thyroglobulin antigens are expressed exclusively on the apical cell surface of thyroid epithelial cells, while Ia antigens are found on the basal part of the cell.

Animals↗
PubMed1983

Immunological studies of autoimmune thyroid disorders: abnormalities in the inducer T cell subset and proliferative responses to autologous and allogeneic stimulation.

Various immunological parameters were investigated in patients with Hashimoto's thyroiditis (HT) and Graves' disease (GD). The total T cell numbers were significantly decreased in both diseases whether they were enumerated by E rosetting or by pan-T cell monoclonal antibodies (OKT3 and anti-Leu 1). This diminution was due to a loss in the inducer T cell subset (OKT4+/Leu 3a+) whereas the cytotoxic/suppressor T cells (OKT8+/Leu 2a+) were present at normal levels in both diseases. The B cells were significantly higher in GD patients than in controls but were not modified in HT patients. Monocyte percentages remained unchanged and DR+ cells were slightly increased in the two diseases. On the other hand, T lymphocyte responses to stimulation by autologous or allogeneic cells were significantly impaired in GD but not in HT whether cultures were performed in autologous plasma or AB serum. In addition, lymphocytes from normal subjects were unable to proliferate in auto- or allo-MLR in the presence of plasma from GD patients but they were reactive in the presence of HT plasma or AB serum. Taken together, these results suggest that the patients with autoimmune thyroid disorders exhibit a T cell imbalance within the OKT4+/Leu 3a+ subset. Moreover, this abnormality is correlated with the observation that autoreactive and alloreactive cells are defective in GD.

Adult↗
PubMed1983

Autorosette forming cells: phenotypic analysis, specificity and role in the autologous mixed lymphocyte reaction.

The phenotype of autorosette forming cells (A-RFC) in the peripheral blood of normal subjects was analyzed. Using a fluorescent technique in which the rosetting cells are labeled with different monoclonal antibodies directed against various cell surface antigens, we demonstrated that A-RFC are T cells, the majority of which belong to the helper/inducer subset. Nevertheless, about 10% of the A-RFC bear the Leu 2a antigens, which are specific for cytotoxic/suppressor T cells. On the other hand, no autorosettes were identified by OKT6 or anti-DR antibodies. When autologous and allogeneic red blood cells were added simultaneously to lymphocytes, 78% mixed rosettes were formed, suggesting a lack of specificity in autorosette formation. A functional role for A-RFC in the autologous mixed lymphocyte reaction (A-MLR) is demonstrated by the fact that the removal of A-RFC from the responder population abrogated the proliferative response in A-MLR. Therefore, despite their non restriction, A-RFC may represent an autoreactive T cell subset.

Antibodies, Monoclonal↗
PubMed1982

Syngeneic sensitization of mouse lymphocytes on monolayers of thyroid epithelial cells. II. T and B cell involvement in primary responses.

Using a previously developed in vitro model of sensitization of lymphoid cells against monolayers of syngeneic thyroid epithelial cells, the T or B nature of the population involved in the primary response has been investigated. For this purpose normal good responder CBA strain mice were used. T cell participation was clearly demonstrated in two ways: first, by the loss of primary sensitization after T cell depletion accomplished using several different techniques (including in vivo and in vitro anti-Thy-1.2 treatment, hydrocortisone and cyclophosphamide injections) and second, by the high response (measured by tritiated thymidine uptake) of T cell-enriched suspensions obtained either by nylon wool filtration or Ig-anti-Ig columns.

Animals↗
PubMed1982

Syngeneic sensitization of mouse lymphocytes on monolayers of thyroid epithelial cells. III. Induction of thyroiditis by thyroid-sensitized T lymphoblasts.

During in vitro sensitization of CBA spleen lymphocytes on syngeneic monolayers of either thyroid epithelial cells (TEC) or fibroblasts, stimulation occurs, as assessed by thymidine incorporation and lymphoblast generation. When lymphoblasts generated on syngeneic TEC are injected either into thyroid lobes of intact CBA recipients or i.v., thyroiditis appears at least 21 days after injection. Thyroiditis is assessed by both optical and electron microscopic blind studies and by the presence of antibodies in the sera directed against mouse thyroglobulin. In contrast, control animals which received identical numbers of lymphoblasts generated on syngeneic fibroblasts behaved as normal. Thyroiditis was also induced using pure thyroid-sensitized T lymphoblasts. This is the first report showing the role of T lymphocytes in the induction of experimental autoimmune thyroiditis.

Animals↗
PubMed1982

Studies on mouse auto-reactive cells. II. Cytotoxicity exerted by mouse lymphocytes against syngeneic erythrocytes.

In mice, an in vitro cell-mediated cytotoxicity is directed towards syngeneic erythrocytes used as targets. This phenomenon occurs in lymphoid organs of normal, non-immunized mice. Its intensity is greater in the thymus than in spleen or lymph nodes. The study of the nature of the cell responsible for this spontaneous syngeneic cytotoxicity ruled out the role of macrophages. The involvement of T cells in this phenomenon is assessed by its disappearance after the lymphoid cells had been treated with anti-theta serum plus complement, by its disappearance from lymphoid organs of mice previously treated by hydrocortisone, and by its decrease in the presence of synthetic thymic factor. Moreover, spontaneous syngeneic cytotoxicity is lost when lymphoid cells are depleted at autologous rosettes by centrifugation on a Ficoll-Hypaque gradient after rosette formation. Cytotoxic lymphocytes might belong to the population of auto-rosettes previously characterized as a population of immature T cells.

Animals↗
PubMed1981

[Differences in the distribution of class I and II antigens of the major histocompatibility complex on the surface of cultured epithelial cells of the mouse thyroid].

From day 9 to 15 of Thyroid Epithelial Cell (TEC) culture the expression of MHC antigens (K, D and Ia) was studied. Methods used for antigen detection included direct cytotoxicity in the presence of rabbit complement and electron microscopy using goat anti-mouse peroxidase-labeled Fab fragments. Results obtained showed that the K and D end-coded MHC antigens (class I) are exclusively expressed on the apical cell surface of TEC while Ia antigens (class II) are only found on the basal part of the cell.

Animals↗