Participation of a Cathepsin L-Type Protease in the Activation of Caspase-3.

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  • Ishisaka Rumi
    Institute of Medical Science, Kurashiki Medical Center, 250 Bakuro-cho, Kurashiki 710-8522, Japan
  • Utsumi Toshihiko
    Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
  • Kanno Tomoko
    Institute of Medical Science, Kurashiki Medical Center, 250 Bakuro-cho, Kurashiki 710-8522, Japan
  • Arita Kayo
    Institute of Medical Science, Kurashiki Medical Center, 250 Bakuro-cho, Kurashiki 710-8522, Japan
  • Katsumura Nobuhiko
    Institute for Health Science, Tokushima Bunri University, Tokushima 770-8514, Japan
  • Akiyama Jitsuo
    Doonan Institute of Medical Science, Hakodate 041-8502, Japan
  • Utsumi Kozo
    Institute of Medical Science, Kurashiki Medical Center, 250 Bakuro-cho, Kurashiki 710-8522, Japan

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A previous paper from this laboratory reported the activation of a caspase-3-like protease by a digitonin-treated lysosomal fraction [FEBS Lett. 435, 233-236, 1998]. In this study, we examined the effects of specific inhibitors of lysosomal cysteine proteases, such as cathepsins B, S, and L, on the activation of caspase-3 to find out which cathepsin is responsible for the activation. Pro-caspase-3 in the cytosol was cleaved by a lysosomal protease(s) contained in the supernatant of a digitonin-treated crude mitochondrial fraction containing lysosomes (ML) and the cleaved product was detected by Western blotting using anti-caspase-3 antibody. The activation of caspase-3 by the lysosomal protease(s) was pH dependent and the optimun pH for activation was pH 6.6-6.8. This activation was not inhibited by CA-074, a specific inhibitor of cathepsin B, but was strongly inhibited by CLIK-066 and CLIK-181, specific inhibitors of cathepsin L. The inhibitory effect of CLIK-060, a specific inhibitor of cathepsin S, was very weak. Furthermore, the activation of caspase-3 was enhanced by addition of purified cathepsin L only in the presence of the supernatant of the digitonin-treated ML. These results suggested that a cathepsin L-type protease activity might participate in the activation mechanism of caspase-3 in the presence of the supernatnat from the ML.

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