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Apoptosis accompanied by up-regulation of TNF-alpha death pathway genes in the brain of Niemann-Pick type C disease.

Abstract：

:Niemann-Pick disease type C (NP-C) is an autosomal recessive neurovisceral storage disease with neurodegeneration caused by mutations in either the NPC-1 or NPC-2 gene. The murine ortholog of NPC-1 is mutated in BALB/c npc(nih) and this mutant mouse shows equally conspicuous neurodegeneration and loss of neurons. However, the molecular mechanisms causing neurodegeneration in NP-C remain elusive. Here, we report the presence of apoptotic cells detected by both TUNEL staining and electron microscopy in the cerebrum and cerebellum of human patients and the mouse model. Moreover, we found that with progression of the disease process leading to neuronal cell death, an up-regulation of genes involved in the TNF-alpha death pathway caspase-8, FADD, TNFRp55, TRADD, and RIP-by an RNA protection assay. Furthermore, RT-PCR showed that TNF-alpha mRNA expression level also increased up to 30-50-fold in the cerebellum of 7- and 9-week-old NP-C mice compared with wild-type mice. Elevated expression of TNF-alpha was detected in both neurons and astrocytes with TNF-alpha-expressing astrocytes distributed in the affected brain regions. Collectively, our results suggest that the cell death in the brain of NP-C disease occurs through apoptosis and it is mediated by the TNF receptor superfamily pathway.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Wu YP,Mizukami H,Matsuda J,Saito Y,Proia RL,Suzuki K

doi

10.1016/j.ymgme.2004.08.017

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

9-17

issue

1

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(04)00218-5

journal_volume

84

pub_type

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