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. 1995 Aug 1;14(15):3599–3608. doi: 10.1002/j.1460-2075.1995.tb00029.x

Mice deficient for the lysosomal proteinase cathepsin D exhibit progressive atrophy of the intestinal mucosa and profound destruction of lymphoid cells.

P Saftig 1, M Hetman 1, W Schmahl 1, K Weber 1, L Heine 1, H Mossmann 1, A Köster 1, B Hess 1, M Evers 1, K von Figura 1, et al.
PMCID: PMC394433  PMID: 7641679

Abstract

Mice deficient for the major lysosomal aspartic proteinase cathepsin D, generated by gene targeting, develop normally during the first 2 weeks, stop thriving in the third week and die in a state of anorexia at day 26 +/- 1. An atrophy of the ileal mucosa first observed in the third week progresses towards widespread intestinal necroses accompanied by thromboemboli. Thymus and spleen undergo massive destruction with fulminant loss of T and B cells. Lysosomal bulk proteolysis is maintained. These results suggest, that vital functions of cathepsin D are exerted by limited proteolysis of proteins regulating cell growth and/or tissue homeostasis, while its contribution to bulk proteolysis in lysosomes appears to be non-critical.

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