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- W2076609293 abstract "Granzymes are a family of structurally related serine proteases that differ markedly in their substrate specificities. Although these proteases were predicted to function as intracellular and/or extracellular proteases in processes ranging from cell death to extracellular matrix cleavage to viral inactivation, intense research over the past two decades has focused primarily on their contributions as intracellular proteolytic mediators of cell death. This can be attributed at least in part to landmark studies by Hayes et al. demonstrating a synergistic cytotoxic effect when cells were exposed to perforin/cytolysin and granzymes. Since then, and perhaps fostered by the exponential growth of apoptosis research funding in the 1990s, there have been relatively fewer investigations into the potential broader functionality of these proteases with respect to non-apoptotic and/or perforinindependent functions. There are 5 human granzymes (A, B, H, K, M) and 11 mouse granzymes (A, B, C, D, E, F, G, K, L, M, N). One potential explanation for such diversity is to ensure efficient immune-mediated killing of unwanted cells that could otherwise be resistant to the proteolytic activity of a single granzyme. To examine a pan-granzyme role in immunity and disease, perforin knockout mice were, and still are, often used to indirectly determine whether granzymes exert a causative role in disease. If perforin-deficient mice did not elicit a differential response or outcome, it was, and still is, often concluded that the granule pathway is not involved. However, based on emerging evidence, one must question whether using perforin knockout mice exclusively to evaluate a role for granzymes in disease is appropriate. In this issue of Cell Death and Differentiation, a number of articles are provided that summarize the role of granzymes and perforin in a variety of pathologies and present data arguing for both perforin-dependent and perforin-independent functions of these enzymes in cytotoxicity and other responses. Clearly, one cannot ignore the extensive literature pertaining to the granzyme B/perforin pathway in immune-mediated apoptosis. Indeed, as discussed by Brennan et al., a complete loss of cytotoxic lymphocyte perforin function results in familial haemophagocytic lymphohistiocytosis, while a partial loss of perforin function appears to strongly predispose patients to haematological malignancies. However, although perforin knockout mice are susceptible to tumorigenesis, the same cannot be said for single granzyme knockout mice, suggesting that it is necessary to prevent the internalization of multiple granzymes and/or other factors to attenuate tumour clearance. Alternatively, it is possible that perforin may possess certain, as yet undefined, granzyme-independent effects on cells. The granzyme B/perforin pathway has been proposed as the predominant mechanism for immune-mediated apoptosis of allogeneic cells. As such, this pathway is important in acute and chronic organ transplant rejection. As discussed by Choy, while findings using perforin or granzyme B knockout mice are mixed for acute rejection due to differences in transplantation models, both molecules appear to be important for T cell-mediated destruction of allogeneic cells and grafts, and both appear to be important in chronic rejection as their absence results in reduced allograft vasculopathy in mouse models of heart transplant rejection. As with most ailments, a role for other granzymes in acute or chronic rejection remains unknown. Another interesting, potentially perforin-dependent role for granzymes is emerging in diabetes research. As discussed by Thomas et al. in this issue, perforin deficiency attenuates type I diabetes by reducing islet/beta cell death, suggesting that this pathway is important, while recent evidence presents a role for granzyme-mediated inflammation in this disease. As further support for the granule pathway in disease, mutations in perforin are associated with type I diabetes. As a redundant role for other pro-apoptotic inducers such as FasL has been proposed, it will be important to determine if and how autoantigen production and/or pro-inflammatory cytokine production contribute to diabetes. An area that remains poorly understood is the role of endogenous granzyme inhibitors in the physiological regulation of granzyme activity and in pathogenesis. As discussed in the review by Kaiserman and Bird, although inhibitors have been identified for some granzymes, surprisingly little is known pertaining to any pathophysiological role for granzyme serine protease inhibitors (serpins) in disease. Much research needs to be done to verify whether they inhibit granzymes in vivo and whether alterations in their regulation, levels, and/or activity are altered in disease. Further, identification and characterization of granzyme serpins have focused primarily on intracellular inhibitors of apoptosis. Owing to" @default.
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- W2076609293 date "2010-03-15" @default.
- W2076609293 modified "2023-10-07" @default.
- W2076609293 title "Granzymes in disease: bench to bedside" @default.
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- W2076609293 doi "https://doi.org/10.1038/cdd.2009.218" @default.
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