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- W2247456267 abstract "Monitoring of human allografts requires to use histological, immunohistochemical and functional techniques to characterize graft infiltrating cells. Granzyme B and perforin gene expression is of major importance in functional studies. Those proteins are present in the cytoplasmic granules of cytotoxic T lymphocytes and are secreted during granule exocytosis at the effector/target cell interface. Gene expression of both proteins has been studied by in situ hybridization using specific riboprobes on serial sections of biopsies in two pathological models. Our results show that cells infiltrating early skin lesions of patients with acute GVHD after bone marrow graft are exclusively composed of T cells, among which some of them express granzyme B and perforin genes. Similarly the presence of granzyme B and perforine-expressing cells in endomyocardial biopsies of heart transplanted patients has been associated to early and severe crisis of rejection. In contrast, the absence of functional markers in lymphoid infiltrates was coinciding with less aggressive and late episodes of rejection. Taken together, our data indicate that granzyme B and perforin gene expression in skin infiltrating lymphocytes during GVH or within heart infiltrating cells during crisis of rejection are in favor of severe processes. The study has allowed to predict during heart transplantation the apparition of a rejection crisis and to show the necessity for treating the patient with immunsuppresive drugs. This is also the case for patients with GVHD at the time of the first skin rash." @default.
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- W2247456267 date "1991-01-01" @default.
- W2247456267 modified "2023-09-27" @default.
- W2247456267 title "Perforin and granzyme B: predictive markers for acute GVHD or cardiac rejection after bone marrow or heart transplantation." @default.
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