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. 2004 May 7;279(19):20200-10.
doi: 10.1074/jbc.M313108200. Epub 2004 Feb 25.

Granzyme-mediated cytotoxicity does not involve the mannose 6-phosphate receptors on target cells

Ralf Dressel  1 , Srikumar M Raja, Stefan Höning, Tim Seidler, Christopher J Froelich, Kurt von Figura, Eberhard Günther
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Free article

Granzyme-mediated cytotoxicity does not involve the mannose 6-phosphate receptors on target cells

Ralf Dressel et al. J Biol Chem. .
Free article

Abstract

Cytotoxic T lymphocytes (CTL) and natural killer cells secrete granzymes to kill infected or transformed cells. The mannose 6-phosphate receptor (Mpr) 300 on target cells has been reported to function as receptor for secreted granzyme B. Using lymphoblasts and mouse embryonal fibroblast lines from Mpr300 and Mpr46 knockout mice, we show here that both receptors are not essential for CTL-induced apoptosis. Similarly, cells exposed to either monomeric granzyme B or granzyme B-serglycin complexes readily internalize the granzyme and undergo apoptosis in the absence of Mpr300 and Mpr46. Further, no colocalization of granzyme B and Mpr300 could be observed in target cells after internalization. In conclusion, these results strongly argue against an Mpr300- or Mpr46-dependent pathway of granzyme-mediated killing and provide new insight in the internalization of monomeric and complexed granzyme B.

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