New study shows how malaria parasite damages brain

Bilkul Online

1 year ago

New Delhi, Sep 19: Researchers have identified how the malaria parasite Plasmodium falciparum affects the brain, an advance that may help develop potential therapeutics that could help prevent or even reverse the damage. Cerebral malaria kills one out of five children who suffer from it and also causes long-term disabilities in half of the survivors.

Malaria is caused by the parasite Plasmodium falciparum, which reproduces in our red blood cells and then breaks out of them to continue infecting new cells. Once the parasite makes it to the blood-brain barrier (BBB) — a structure that protects the brain from harmful substances — it can damage it, causing severe complications. To understand its effects, researchers from the European Molecular Biology Laboratory (EMBL) in Barcelona, Spain, created a lab-grown BBB to show how the parasite damages it. “You have to imagine the BBB as a system of tightly sealed pipes that prevent leaks. The malaria parasite is capable of developing cracks in those pipes and creating a leak that starts dripping infected fluid into the brain, causing swelling and making the disease irreversible,” said Livia Piatti, postdoctoral student at EMBL.

The lab-grown infection model of the human BBB included the key cellular players: endothelial cells that line the blood vessels, supporting pericytes, and astrocytes, which are star-shaped brain cells, all arranged in a 3D structure with flowing fluid. The miniature BBB-on-a-chip (3D-BBB) was exposed to the parasite at its most explosive stage: the moment it bursts out of red blood cells in a process called egress. The findings, published in the journal Nature Communications, indicated that the barrier had become more permeable. In addition, analysis of gene expression at the single-cell level showed that cells were producing less of the proteins that keep the BBB sealed, and more of the molecules that cause inflammation. Further, the researchers successfully tested an approved drug, Ruxolitinib, on their 3D-BBB model, with results suggesting that it could be effective for deadly cases of malaria. By helping calm the inflammation in the blood vessels of the brain, the drug reduced the leakiness of the BBB, they said.