NMO sera down-regulate AQP4 in human astrocyte and induce cytotoxicity independent of complement.

Abstract:

:Autoantibodies against astrocyte water channel aquaporin-4 (AQP4) are highly specific for neuromyelitis optica (NMO). However, the molecular mechanism of NMO still remains unclear. The purpose of this study was to identify the possible humoral mechanisms responsible for the occurrence of astrocytic damage. Human primary astrocytes (AST) were immortalized by retroviral vectors harboring temperature-sensitive SV40 T antigen gene and AQP4 cDNA (M23), designated as hAST-AQP4. The effects of NMO sera on the content and localization of AQP4, including cytotoxicity and astrocytic morphology, were evaluated. In addition, this study examined whether the amount and localization of AQP4 protein in astrocytes were influenced by direct contact with the immortalized human brain microvascular endothelial cell line, TY09. NMO sera alone induced cytotoxicity and addition of complement had a more harmful effect on hAST-AQP4. NMO sera also decreased AQP4 mRNA and protein. NMO sera alone up-regulated TNFα and IL-6 in astrocytes and co-incubation with anti-TNFα and anti-IL-6 neutralizing antibodies blocked both the cytotoxicity and reduction of AQP4 in astrocytes. In the experiment using the in vitro BBB models, AQP4 protein mainly localized at the astrocytic membrane after co-culture with TY09, in contact with TY09. The future elucidation of factors that up-regulate AQP4 in astrocytes presumably released by blood brain barrier forming endothelial cells and that block the production of inflammatory cytokines may therefore lead to the development of a novel therapeutic strategy.

journal_name

J Neurol Sci

authors

Haruki H,Sano Y,Shimizu F,Omoto M,Tasaki A,Oishi M,Koga M,Saito K,Takahashi T,Nakada T,Kanda T

doi

10.1016/j.jns.2013.05.035

subject

Has Abstract

pub_date

2013-08-15 00:00:00

pages

136-44

issue

1-2

eissn

0022-510X

issn

1878-5883

pii

S0022-510X(13)00269-4

journal_volume

331

pub_type

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