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TOKYO, Sept. 18 -- Researchers in Japan may have discovered the pathological mechanism of Alzheimer's disease (AD) based on phosphoproteome analysis, which would provide new clues to an effective therapy for the currently incurable disease, Japanese news website news.mynavi.jp reported on Thursday.

Comprehensive phosphoproteome analysis unravels the core signaling network that initiates the earliest synapse pathology in preclinical AD brain, said the researchers led by Kazuhiko Tagawa from Tokyo Medical and Dental University in a report published on Wednesday in the online edition of Human Molecular Genetics.

Using a high-end mass spectrometry, the researchers screened phosphoproteins and phosphopeptides in four types of AD mouse models and human AD postmortem brains.

"We identified commonly changed phosphoproteins in multiple models and also determined phosphoproteins related to initiation of A deposition in the mouse brain," they said.

After confirming these proteins were also changed in human AD brains, the researchers put the proteins on experimentally verified protein-protein interaction databases. "Surprisingly most of the core phosphoproteins were directly connected, and they formed a functional network linked to synaptic spine formation," they said.

They found the change of the core network started at a preclinical stage even before histological A deposition. Systems biology analyses suggested phosphorylation of MARCKS by over- activated kinases including PKCs and CaMKs initiates synapse pathology.

"Two-photon microscopic observation revealed recovery of abnormal spine formation in the AD model mice by targeting a core protein MARCKS or by inhibiting candidate kinases, supporting our hypothesis formulated based on phosphoproteome analysis," said the researchers.

AD is the most common form of dementia. There is at present no cure for the disease, which worsens as it progresses, and eventually leads to death.