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The Journal of Neuroscience, September 15, 2000, 20(18):6898-6906

Cathepsin D Deficiency Induces Lysosomal Storage with Ceroid Lipofuscin in Mouse CNS Neurons

Masato Koike1, Hiroshi Nakanishi2, Paul Saftig3, Junji Ezaki5, Kyoko Isahara1, Yoshiyuki Ohsawa1, Walter Schulz-Schaeffer4, Tsuyoshi Watanabe1, Satoshi Waguri1, Satoshi Kametaka1, Masahiro Shibata1, Kenji Yamamoto2, Eiki Kominami5, Christoph Peters6, Kurt von Figura3, and Yasuo Uchiyama1

1 Department of Cell Biology and Neurosciences, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan, 2 Department of Pharmacology, Faculty of Dentistry, Kyushu University, Fukuoka 812-8582, Japan, 3 Center for Biochemistry and Molecular Cell Biology and 4 Department of Neuropathology, Göttingen University, 37073 Göttingen, Germany, 5 Department of Biochemistry, Juntendo University School of Medicine, 2-1-1 Hongo, Tokyo, Japan, and 6 Medizin, Universitätsklinik, Abteilung I, Freiburg University, 79106 Freiburg, Germany

Cathepsin D-deficient (CD-/-) mice have been shown to manifest seizures and become blind near the terminal stage [approximately postnatal day (P) 26]. We therefore examined the morphological, immunocytochemical, and biochemical features of CNS tissues of these mice. By electron microscopy, autophagosome/autolysosome-like bodies containing part of the cytoplasm, granular osmiophilic deposits, and fingerprint profiles were demonstrated in the neuronal perikarya of CD-/- mouse brains after P20. Autophagosomes and granular osmiophilic deposits were detected in neurons at P0 but were few in number, whereas they increased in the neuronal perikarya within days after birth. Some large-sized neurons having autophagosome/autolysosome-like bodies in the perikarya appeared in the CNS tissues, especially in the thalamic region and the cerebral cortex, at P17. These lysosomal bodies occupied the perikarya of almost all neurons in CD-/- mouse brains obtained from P23 until the terminal stage. Because these neurons exhibited autofluorescence, it was considered that ceroid lipofuscin may accumulate in lysosomal structures of CD-/- neurons. Subunit c of mitochondrial ATP synthase was found to accumulate in the lysosomes of neurons, although the activity of tripeptidyl peptidase-I significantly increased in the brain. Moreover, neurons near the terminal stage were often shrunken and possessed irregular nuclei through which small dense chromatin masses were scattered. These results suggest that the CNS neurons in CD-/- mice show a new form of lysosomal accumulation disease with a phenotype resembling neuronal ceroid lipofuscinosis.

Key words: cathepsin D; knockout mouse; CNS neurons; ceroid lipofuscin; subunit c of mitochondrial F1F0ATPase; lysosomal storage; neuronal ceroid lipofuscinosis


Copyright © 2000 Society for Neuroscience  0270-6474/00/20186898-09$05.00/0


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