PubMed · 6457182
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S Sekiguchi, H Takata. 1981. [HLA test].. https://pubmed.ncbi.nlm.nih.gov/6457182/
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Oxidized low density lipoproteins (oxLDL) stimulated human blood T cells to a specific cytotoxic response with autologous PHA activated blood mononuclear cells which had been pre-incubated with oxLDL. The cytotoxic reaction was exerted by CD8+ enriched cells but not by CD4+ enriched cells. Allogeneic target cells from HLA mismatched donors were not damaged and the reaction was consistently inhibited by monoclonal antibody against HLA class I. Antigen-specific cytotoxic T cells might contribute to lysis of cells in the atherosclerotic plaque that have taken up oxLDL and thus participate in the inflammatory process associated with atherosclerosis.
OBJECTIVE: To evaluate the role of antibody dependent cell mediated cytotoxicity (ADCC) and erythrophagocytosis in comparison to IgG subtypes and concentration of anti-D in haemolytic disease of the newborn (HDN). DESIGN, SETTING AND PATIENTS: One hundred Rh (D) immunised women attending an antenatal clinic of Nowrosjee Wadia Maternity Hospital at 32 to 34 weeks of gestation. Results of 90 women having Rh (D) positive infants were correlated with severity based on outcome of pregnancy, cord blood Hb and treatment given to infant. MEASUREMENTS: Immunoradiometric assay (IRMA) was used for anti-D quantitation. In ADCC assay 51Cr release in the culture supernatant was measured, and in the phagocytosis assay lytic activity was measured on spectrophotometer. Cord blood monocytes were used as effector cells in both the assays. RESULTS: Good correlation (P < 0.01) was observed between ADCC vs IRMA and ADCC vs phagocytosis. ADCC% specific lysis was significantly higher and still-birth rate was increased when mothers had IgG1 + IgG3 type of anti-D. Though all variables showed significant correlation (P < 0.01) with severity, ADCC assay was the most predictive. Cord blood haemoglobin showed a significant inverse correlation with ADCC and phagocytosis assays. CONCLUSION: In the absence of a cordocentesis facility severity of Rh HDN could be reliably judged by ADCC assay. If an isotope laboratory is not available, then instead of ADCC, phagocytosis assay may be employed.
Flow cytometric screening of sera using pooled chronic lymphocytic leukaemia (CLL) cells has previously been reported as a quick method for detecting HLA antibodies of the IgG class. In this study we investigated the sensitivity of this method in the detection of IgG and IgM alloantibodies, and its performance in serum screening when compared to conventional microlymphocytotoxic screening. Results indicate that flow cytometric screening is more sensitive in the measurement of IgG alloantibodies by up to five doubling dilutions, whereas the converse is true for IgM. IgM autoantibodies were found not to be detectable by flow cytometry. By testing a large number of sera by both methods in parallel, we have found that a significant proportion of sera exhibiting no activity of IgM activity alone on cytotoxic screening contain IgG antibodies detectable with a pool of CLL cells on the flow cytometer.