Publications by authors named "Alie-daram S"

Sickle cell anemia, a congenital hemolytic type of anemia due to a genetic defect in the beta chain of the globin molecule can cause severe disease. During pregnancy, the risk for preeclampsia and deep venous thrombosis is increased in patients with sickle cell anemia. Occlusion of placenta blood vessels with rigid deformed erythrocytes can cause repeated miscarriages and intra-uterine fetal death.

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In spite of the progress made since 1970 in specific prevention by anti-rhesus immunoglobulins, and improved management of at-risk pregnancies, allo-immunization due to the erythrocytic Rh 1 antigen (formerly known as Rhesus D or Rh D) remains widespread. In fact, anti-Rh 1 antibodies currently constitute over one-third of the immune antibodies detected after pregnancy. The prevention of allo-immunization against the Rh 1 antigen is therefore still problematical, and concerns approximately one pregnant woman in seven.

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The gel test assay was evaluated for IgG subclass detection by GM typing of antibodies and compared to the classical inhibition agglutination method on slides or microtiter plates. We used a panel of 5 murine monoclonal antibodies directed against G1M(1), G1M(3), G1M(17), G2M(23), and G3M(21) and 1 human polyclonal anti-G3M(5) antibody. Eleven polyclonal antisera (of immunized women) directed against red blood cells were tested for the GM allotypes carried by their alloantibodies.

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To develop a blood typing reagent with Rh specificity, peripheral blood lymphocytes were isolated from a multiparous woman with apparent alloanti-Ce and fused with FIS heteromyeloma cells. One hybridoma cell line, FOR-2E3, secreted human IgG, which agglutinated all human red blood cells except R2R2, RZRZ, Dc-, D--, Rhnull, and e+ hrB-. The supernatant is useful as a reagent to screen for hrB- blood donors and to differentiate haplotypes with C and e in cis from haplotypes with C and e in trans.

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As already found in other various diseases, a macromolecular alkaline phosphatase complex (HMW-AP) was also found in sera of two severe Rhesus-incompatible pregnancies complicated by ascites and fetal hydrops at delivery. This atypical complex was detected and isolated by agarose gel electrophoresis. Immunoelectrophoresis and heat inactivation of this HMW-AP complex revealed that it consisted of IgG of the kappa type and placental AP isoenzyme.

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IgG2, G2m(23) anti-Rh-D antibodies were detected in the serum of a donor. It has been characterized by Gm typing and the use of polyclonal and mouse monoclonal anti-IgG subclasses (which had proved to be satisfactory for agglutination of sensitized red blood cells). This anti-D constitutes a good reagent for G2m(23) typing.

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In 11 cases with anti-Rh-complicated pregnancies, i.e. ascites at 21/25 weeks and fetal hydrops at delivery, we detected the presence of IgG/placental alkaline phosphatase complexes in the maternal serum.

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