当前位置： SCI文献检索 > BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS期刊下所有文献 > Pontine norepinephrine defects in Mecp2-null mice involve deficient expression of dopamine beta-hydroxylase but not a loss of catecholaminergic neurons.

Pontine norepinephrine defects in Mecp2-null mice involve deficient expression of dopamine beta-hydroxylase but not a loss of catecholaminergic neurons.

Abstract：

:Rett syndrome is a neurodevelopmental disorder caused by Mecp2 gene mutations. In RTT patients and Mecp2-null (Mecp2(-/Y)) mice, norepinephrine (NE) content drops significantly, which may play a role in breathing arrhythmia, sleep disorders and sudden death. However, the underlying mechanisms for the NE defect are not fully understood. The NE defect may result from decreased NE biosynthesis, loss of catecholaminergic neurons or both. Although deficiency in tyrosine hydroxylase (TH) has been demonstrated, it is possible that dopamine beta-hydroxylase (DBH), the critical enzyme converting dopamine to NE, is also affected. To test these possibilities, we studied DBH expressions in pontine catecholaminergic neurons of Mecp2(-/Y) mice identified with breathing abnormalities. In comparison to the wild type, Mecp2(-/Y) mice at 2months of age showed approximately 50% decrease in the expressions of DBH and TH, at both protein and mRNA levels in the locus coeruleus (LC) region. Consistently, DBH and TH immunoreactivity was markedly decreased in LC neurons of Mecp2(-/Y) mice. No evidence was found for selective deficiency in TH- or DBH-containing neurons in Mecp2(-/Y) mice, as almost all TH-positive cells expressed DBH. By counting TH-immunoreactive cells in the LC, we found that the Mecp2(-/Y) mice lost only approximately 5% of the catecholaminergic neurons as compared to wild-type, although their LC volume shrank by approximately 15%. These results strongly suggest that the NE defect in Mecp2(-/Y) mice is likely to result from deficient expression of not only TH but also DBH without significant loss of catecholaminergic neurons in the LC.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Zhang X,Su J,Rojas A,Jiang C

doi

10.1016/j.bbrc.2010.02.156

subject

Has Abstract

pub_date

2010-04-02 00:00:00

pages

285-90

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(10)00390-6

journal_volume

394

pub_type

杂志文章

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