Abstract:
:Cytotoxic lymphocytes utilize granule associated serine proteases (granzymes) and perforin to induce apoptosis. Although the importance of granzyme B has been established by gene ablation experiments, biochemical events initiated by the granzyme remain enigmatic. We show here that exposure of Jurkat cells to granzyme B and perforin results in cleavage of poly(ADP-ribose) polymerase to an apoptotic 89 kDa fragment and to lesser amounts of a 64 kDa fragment. The 64 kDa fragment is produced directly by granzyme B while the 89 kDa fragment is presumably generated by activated ICE/Ced-3 proteases. Establishing the intracellular function of GrB in the apoptotic response, these results indicate that granzyme B enters perforin treated targets activating the ICE/Ced-3 family proteases which then cleave poly(ADP-ribose) polymerase to its apoptotic fragment. Intracellular granzyme B appears to be translocated to the nucleus where the protease directly cleaves poly(ADP-ribose) polymerase.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Froelich CJ,Hanna WL,Poirier GG,Duriez PJ,D'Amours D,Salvesen GS,Alnemri ES,Earnshaw WC,Shah GMdoi
10.1006/bbrc.1996.1565subject
Has Abstractpub_date
1996-10-23 00:00:00pages
658-65issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(96)91565-Xjournal_volume
227pub_type
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