Cleavage of caspase family members by granzyme B: a comparative study in vitro

European Journal of Immunology
M Van de CraenP Vandenabeele

Abstract

The aspartase granzyme B is one of the major components of the granules involved in cell killing by cytotoxic T lymphocytes. Granzyme B has been shown to activate the apoptotic death pathway in the target cell, and this involves activation of members of the caspase (CASP) protein family. Therefore, activational cleavage of mouse (m) CASP proforms by granzyme B was examined in vitro. CASP can be subdivided in the CASP-1 (interleukin-1 beta-converting enzyme; ICE) subfamily, the CASP-2 (Ich1) subfamily, and the CASP-3 (CPP32) subfamily. Our results reveal that the proforms of the CASP-3 subfamily members mCASP-3 and mCASP-7 are hydrolyzed by granzyme B, while proforms of CASP-2 and CASP-1 subfamily members are not directly cleaved. Only one CASP-3 subfamily member, pro-mCASP-6, was not proteolytically cleaved by granzyme B. These results indicate that two members of the CASP-3 subfamily, but no others, become activated by granzyme B.

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Citations

Mar 20, 2004·Pharmacology & Therapeutics·Amere Subbarao Sreedhar, Peter Csermely
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