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Human midsized neurofilament subunit induces motor neuron disease in transgenic mice.

Abstract：

:Aberrant accumulation of neurofilaments is a feature of human motor neuron diseases. Experimentally motor neuron disease can be induced in transgenic mice by overexpressing the mouse neurofilament light subunit (NF-L), the human heavy subunit (NF-H), or mouse peripherin. Here we describe that mice harboring a bacterial artificial chromosome (BAC) transgene containing the human midsized neurofilament subunit (NF-M) gene develop a progressive hind limb paralysis associated with neurofilamentous accumulations in ventral horn motor neurons and axonal loss in ventral motor roots. Biochemical studies revealed that all three mouse neurofilament subunits along with the human NF-M contributed to filament formation, although filaments contained less peripherin. In addition the endogenous mouse NF-M became less phosphorylated in the presence of the human protein and accumulated in the cell bodies of affected neurons even though phosphorylated human NF-M did not. Remaining motor axons contained an increased density of neurofilaments and morphometric studies showed that principally small myelinated axons were lost in the transgenic animals. Removing half of the mouse NF-M by breeding the transgene onto the mouse NF-M heterozygous null background offered no protection against the development of disease, arguing that the effect is not simply due to elevation of total NF-M. Collectively these studies argue that the human and mouse NF-M proteins exhibit distinct biochemical properties and within mouse neurons are not interchangeable and that indeed the human protein may be toxic to some mouse neurons. These studies have implications for the use of human neurofilament transgenic mice as models of amyotrophic lateral sclerosis.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Gama Sosa MA,Friedrich VL Jr,DeGasperi R,Kelley K,Wen PH,Senturk E,Lazzarini RA,Elder GA

doi

10.1016/s0014-4886(03)00206-1

keywords:

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

408-19

issue

1

eissn

0014-4886

issn

1090-2430

pii

S0014488603002061

journal_volume

184

pub_type

杂志文章

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