p75 super(NTR) independent oligodendrocyte death in cuprizone-induced demyelination in C57BL-6 mice

• Published in: Neuropathology and applied neurobiology Vol. 31; no. 6; pp. 600 - 609
• Main Authors: Copray, JCVM, Kuest, B M, Mantingh-Otter, I, Boddeke, HWGM
• Format: Journal Article
• Language: English
• Published: 01.12.2005
• ISSN: 0305-1846; 1365-2990
• DOI: 10.1111/j.1365-2990.2005.00656.x

Feeding C57Bl-6 J mice the copper chelator cuprizone leads to selective apoptosis of mature oligodendrocytes and concomitant demyelination predominantly in the corpus callosum. The process of oligodendrocyte apoptosis in this animal model for multiple sclerosis (MS) involves early microglial activation, but no infiltration of T-lymphocytes. Therefore, this model could mimic early stages of oligodendrocyte degeneration Affected oligodendrocytes express the common neurotrophin receptor, p75 super(NTR), a 'stress-receptor' which under certain circumstances can induce apoptosis. Only affected oligodendrocytes in MS lesions and MS animal models express this receptor. In order to study the significance of p75 super(NTR) in the fate of oligodendrocytes, we have exposed wild-type as well as p75 super(NTR)-knockout mice to a 0.2% (w-w) cuprizone diet and performed a comparative immunohistochemical analysis of the corpus callosum at various time points. Surprisingly, our results show that the absence of p75 super(NTR) did not alter cuprizone-induced oligodendrocyte death (and subsequent de- or remyelination). Apparently, intracellular apoptosis pathways in adult oligodendrocytes do not require p75 super(NTR) activated signal transduction in the absence of T-lymphocytes and T-lymphocyte derived cytokines.