Malaria Parasite’s RNA Strategy to Evade Immune System Uncovered

JERUSALEM, March 11 (Xinhua) — Israeli researchers have discovered a sophisticated mechanism by which the deadly malaria parasite evades the host’s immune system, according to the Weizmann Institute of Science. The findings, published in Cell Reports, reveal how the parasite uses messenger RNA (mRNA) to disrupt immune cell function, allowing it to multiply and spread.

How the Malaria Parasite Hijacks Immune Cells

The study demonstrates that the Plasmodium falciparum malaria parasite sends tiny packages, called vesicles, into human immune cells – specifically monocytes – to confuse and disable them. These vesicles carry mRNA molecules that can enter the nucleus, the cell’s “control center,” and interfere with normal cellular processes.

Normally, immune cells produce proteins essential for fighting infections. But, when the parasite’s mRNA enters these cells, it disrupts protein production. Crucially, important immune proteins are not made correctly and are often destroyed, weakening the host’s ability to combat the malaria infection. Researchers describe this as a “decoy” strategy, diverting the immune system while the parasite replicates within red blood cells. Cell Reports

RNA Technology: A Long-Standing Strategy

While RNA technology is a relatively novel frontier in medicine, as exemplified by mRNA-based COVID-19 vaccines, the malaria parasite has been utilizing sophisticated RNA maneuvers for millennia. The Weizmann Institute of Science researchers suggest this discovery could inspire new applications for RNA-based tools in various medical fields.

Previous Research and Key Findings

Over a decade ago, Professor Neta Regev-Rudzki discovered that Plasmodium falciparum communicates with other parasites within red blood cells by secreting vesicles containing DNA segments. Further investigation revealed these vesicles also transport various types of RNA. The recent study focused on understanding the purpose of this RNA transport. Weizmann Institute of Science

The research team found that the parasite delivers its mRNAs into monocytes and imports them into their nuclei, where they disrupt a process called splicing. This disruption interferes with host transcript processing and immune signaling, effectively hindering the body’s defense mechanisms. Hayadan

Implications for Future Treatments and Beyond

This discovery not only enhances our understanding of how malaria spreads so effectively but also opens avenues for developing new treatments that specifically block the parasite’s interference with the immune system. Researchers believe similar strategies involving vesicle-mediated molecular transfer may be employed in other infections and diseases, including cancer and neurodegenerative disorders. Weizmann Institute of Science

Understanding how these “tiny hijackers” operate could lead to improved methods for detecting, treating and preventing a range of serious illnesses.