New way to trap malaria parasites

By Indo Asian News Service | Monday, January 21, 2013 | 2:46:02 PM IST (+05:30 GMT) Comment 0 Comment

Washington, Jan 21 (IANS) Some malaria parasites can wreak havoc by hijacking their host's natural cellular processes. Now, US scientists have identified a new way to trap them.

Washington, Jan 21 (IANS) Some malaria parasites can wreak havoc by hijacking their host's natural cellular processes. Now, US scientists have identified a new way to trap them.

Malaria parasites like Plasmodium falciparum can wreak havoc in one of the most insidious ways.

Researchers from Pennsylvania and Johns Hopkins Universities led by Doron Greenbaum, assistant professor of pharmacology at Penn have identified the cell signaling pathway used by these parasites to escape from and destroy their host cells and infect new cells pointing toward possible new strategies to stop these diseases.

The Plasmodium falciparum and Toxoplasma gondii parasites (which infect cats) invade a host cell, they take up residence inside a "parasitophorous vacuole" (PV), growing and replicating themselves for about 48 hours, the journal Cell, Host and Microbe reports.

Then they burst out of the PV, completely destroying and dissolving the protein-based cytoskeleton of their host, freeing themselves to seek out and infect new host cells, according to a Penn and Johns Hopkins statement.

The current study took the next step of identifying which host signaling pathway was involved, with the aim of derailing the parasite's escape route, trapping it inside the host cell and preventing it from spreading infection.

"We found an entire signaling pathway in the human host cell that the parasite engages, starting from a G-protein-coupled receptor, that the parasite uses to dismantle the cytoskeleton of the host cell, causing it to collapse," Greenbaum explains.

"There's a complex series of proteins in this signaling cascade. One of the key proteins is protein kinase C (PKC). We found a tremendous amount of biological validation for the existence and use of this pathway in both parasitic organisms," says Green baum.

Greenbaum and collaborators tested known PKC inhibitors in both cell assays and in mouse models. These studies showed a marked decrease in parasitic infection for both P. falciparum and T. gondii.

Greenbaum notes: "It's a human enzyme (PKC) that we're targeting, and by inhibiting it we've basically blocked the parasites from getting out. They're trapped and die within the host cells."

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