Tissue typing by mixed culture of lymphocytes. II. Demonstration of H-2 antigen differences by mixed cultures with addition of subcellular fractions prepared from homogenate of lymph-node cells destroyed by supersonication
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<p>1. It has been found that mouse lymph.node cells, even destroyed by sonication with 20 KC supersonicator, maintain sufficient antigenicity both in vitro and in vivo. 2. When such sonicated cell homogenate is cultured with live lymph-node cells, there can be observed blastformation and the peak of the rate of the blastformation is seen at culture hour 48. 3. When PHA (phytohemagglutinin)-M is added to such mixed cultures, the blastformation is enhanced. 4. When mixed cultures of mouse lymph-node cells are conducted by using such one-way stimulation method in various combinations, the rate of blastformation can tell quite accurately the differences in H-2 antigens of mice. 5. In the experiment using F1 hybrid mice and the parents, it has been demonstrated that the rate of blastformation in mixed cultures of thepresent experiments shows a direct correlation to the rate of blast formation in mixed cultures of live lymph node cells, whlie it is an inverse proportion to the survival time of the skin transplant. 6. Differences in the transplanation antigens said to be located on sex chromosomes cannot be distinguished by this one.way stimulation method.</p>
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