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Plos One : Amelioration of Behavioral Abnormalities in Bh4- Deficient Mice by Dietary Supplementation of Tyrosine, Volume 8

By Zhuang, Xiaoxi

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Book Id: WPLBN0003943645
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Amelioration of Behavioral Abnormalities in Bh4- Deficient Mice by Dietary Supplementation of Tyrosine, Volume 8  
Author: Zhuang, Xiaoxi
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
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Publisher: Plos

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Zhuang, X. (n.d.). Plos One : Amelioration of Behavioral Abnormalities in Bh4- Deficient Mice by Dietary Supplementation of Tyrosine, Volume 8. Retrieved from http://www.ebooklibrary.org/


Description
Description : This study reports an amelioration of abnormal motor behaviors in tetrahydrobiopterin (BH4)-deficient Spr2/2 mice by the dietary supplementation of tyrosine. Since BH4 is an essential cofactor for the conversion of phenylalanine into tyrosine as well as the synthesis of dopamine neurotransmitter within the central nervous system, the levels of tyrosine and dopamine were severely reduced in brains of BH4-deficient Spr2/2 mice. We found that Spr2/2 mice display variable ‘open-field’ behaviors, impaired motor functions on the ‘rotating rod’, and dystonic ‘hind-limb clasping’. In this study, we report that these aberrant motor deficits displayed by Spr2/2 mice were ameliorated by the therapeutic tyrosine diet for 10 days. This study also suggests that dopamine deficiency in brains of Spr2/2 mice may not be the biological feature of aberrant motor behaviors associated with BH4 deficiency. Brain levels of dopamine (DA) and its metabolites in Spr2/2 mice were not substantially increased by the dietary tyrosine therapy. However, we found that mTORC1 activity severely suppressed in brains of Spr2/2 mice fed a normal diet was restored 10 days after feeding the mice the tyrosine diet. The present study proposes that brain mTORC1 signaling pathway is one of the potential targets in understanding abnormal motor behaviors associated with BH4-deficiency.

 

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