Abstract
We report a novel method for detecting intracellular messenger RNA by combining the techniques of in situ hybridization and polymerase chain reaction (PCR) (in situ cDNA PCR). The technique could detect low abundancy signals and distinguish different levels of gene expression. We examined the expression of the functional markers of activated cytotoxic T lymphocytes, granzyme A, and perforin in human lymphocytes from in vitro cultures. The amplification products were found in the cells and the supernatants, with the distribution critically affected by the protease digestion conditions. The specificity of amplification was confirmed by electrophoretic analysis and Southern blotting. We conclude that the in situ cDNA PCR technique offers a sensitive method of measuring the frequency of signal-expressing cells and has significant research and clinical applications.
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