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        Laser-Mediated Microdissection As a Tool for Molecular Analysis in Arthritis

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        Most current approaches to the analysis of gene expression in arthritic tissue samples are based on RNA isolated either from cultured synovial cells or from synovial biopsies. However, this strategy does not distinguish between specific gene expression profiles of cells originating from separate tissue areas. Therefore, we established the combination of laser-mediated microdissection and RNA arbitrarily primed polymerase chain reaction (RAP-PCR) for differential display to analyze profiles of gene expression in histologically defined areas of arthritic tissue. Cryosections derived from synovial tissue were used to obtain cell samples from different tissue areas using a microbeam laser microscope. RNA was isolated and analyzed using nested RAP-PCR to generate a fingerprint of the expressed gene sequences. Differentially expressed bands were isolated, cloned, and sequenced. Differential expression of identified sequences was confirmed by in situ hybridization and immunohistochemistry.
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