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Genetic inactivation of GSK3α rescues spine deficits in Disc1-L100P mutant mice.

Abstract：

:Disrupted-in-Schizophrenia 1 (DISC1), a strong candidate gene for schizophrenia and other mental disorders, regulates neurodevelopmental processes including neurogenesis, neuronal migration, neurite outgrowth and spine development. Glycogen synthase kinase-3 (GSK3) directly interacts with DISC1 and also plays a role in neurodevelopment. Recently, our group showed that the Disc1-L100P mutant protein has reduced interaction with both GSK3α and β. Genetic and pharmacological inhibition of GSK3 activity rescued behavioral abnormalities in Disc1-L100P mutant mice. However, the cellular mechanisms mediating these effects of GSK3 inhibition in Disc1 mutant mice remain unclear. We sought to investigate the effects of genetic inactivation of GSK3α on frontal cortical neuron morphology in Disc1 L100P mutant mice using Golgi staining. We found a significant decrease in dendritic length and surface area in Disc1-L100P, GSK3α null and L100P/GSK3α double mutants. Dendritic spine density was significantly reduced only in Disc1-L100P and L100P/GSK3α +/- mice when compared to wild-type littermates. There was no difference in dendritic arborization between the various genotypes. No significant rescue in dendritic length and surface area was observed in L100P/GSK3α mutants versus L100P mice, but spine density in L100P/GSK3α mice was comparable to wild-type. Neurite outgrowth and spine development abnormalities induced by Disc1 mutation may be partially corrected through GSK3α inactivation, which also normalizes behavior. However, many of the other dendritic abnormalities in the Disc1-L100P mutant mice were not corrected by GSK3α inactivation, suggesting that only some of the anatomical defects have observable behavioral effects. These findings suggest novel treatment approaches for schizophrenia, and identify a histological read-out for testing other therapeutic interventions.

journal_name

Schizophr Res

journal_title

Schizophrenia research

authors

Lee FH,Kaidanovich-Beilin O,Roder JC,Woodgett JR,Wong AH

doi

10.1016/j.schres.2011.03.032

subject

Has Abstract

pub_date

2011-06-01 00:00:00

pages

74-9

issue

1

eissn

0920-9964

issn

1573-2509

pii

S0920-9964(11)00180-0

journal_volume

129

pub_type

杂志文章

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