[Evaluation of imaging biomarker by transgenic mouse models]

Area of Science:

• Neuroscience
• Medical Imaging
• Genetics

Background:

• Previous positron emission tomography (PET) technology lacked the resolution to visualize mouse brain functions.
• Transgenic and gene knockout mice are crucial tools for studying brain function and disease.
• Neurodegenerative and psychiatric disorders involve complex neural dysfunctions with unclear etiopathology.

Purpose of the Study:

• To investigate the visualization of functional brain images in transgenic mouse models using a newly developed small-animal PET camera.
• To assess the utility of small-animal PET for quantitative analysis of pathologies in transgenic mouse brains.
• To explore the role of Ca-calmodulin-dependent protein kinase alpha (CaMKII alpha) in psychiatric disorders using knockout mouse models.

Main Methods:

• Utilized a high-resolution small-animal PET camera for functional brain imaging.
• Studied human mutant amyloid precursor protein (APP) transgenic mice to visualize amyloid.
• Investigated Ca-calmodulin-dependent protein kinase alpha (CaMKII alpha) heterozygous knockout (hKO) mice, examining behavioral phenotypes and serotonin 1A receptor density.

Main Results:

• Successfully visualized amyloid in the brains of human mutant amyloid precursor protein (APP) transgenic mice.
• Demonstrated that small-animal PET enables quantitative analysis of pathologies in transgenic mouse brains.
• Observed abnormal behavioral phenotypes in CaMKII alpha hKO mice and altered serotonin 1A receptor density in specific brain regions.

Conclusions:

• Small-animal PET is an effective tool for visualizing and quantitatively analyzing pathologies in transgenic mouse models.
• CaMKII alpha plays a potential role in the pathogenesis of mood disorders and personality traits.
• The established PET assay methodology provides an efficient platform for preclinical evaluation of diagnostic and therapeutic agents for neurological and psychiatric illnesses.