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Phenylketonuria-related synaptic changes in a BTBR-Pah(enu2) mouse model
Lili Liang1, Xuefan Gu, Lihua Lu
1Department of Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Institute for Pediatric Research, Shanghai, China.
Neuroreport
|July 8, 2011
Summary
Phenylketonuria (PKU) causes brain injury by affecting amino acids. This study reveals PKU-related brain impairment in mice involves abnormal dendritic spines and synapses, impacting synaptic function.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Phenylketonuria (PKU) is a common inherited aminoacidopathy linked to brain damage.
- Neuropathology in the BTBR-Pah(enu2) mouse model of PKU has not been previously studied.
Purpose of the Study:
- To investigate neuropathological changes in the CA1 and prefrontal cortex of the BTBR-Pah(enu2) mouse model of PKU.
- To examine alterations in dendritic spines and synapses in this genetic model.
Main Methods:
- Comparative analysis of dendritic spine density, presynaptic active zone length, synaptic cleft width, and postsynaptic density thickness.
- Assessment of Ca(2+)/calmodulin-dependent protein kinase IIα (CaMKIIα) phosphorylation at Thr286.
Main Results:
- BTBR-Pah(enu2) mice exhibited reduced dendritic spine density.
- Abnormalities included shortened presynaptic active zones, widened synaptic clefts, and decreased postsynaptic density thickness.
- Altered phosphorylation of CaMKIIα at Thr286 was observed in BTBR-Pah(enu2) mice.
Conclusions:
- Phenylketonuria-related brain impairment is associated with significant abnormalities in dendritic spines and synapses.
- Dysfunction of CaMKIIα may contribute to impaired synaptic function in PKU.
- These findings highlight the neuropathological impact of PKU on synaptic structure and function.
