Breakthrough in Malaria Research

Researchers in Israel have identified a method used by malaria parasites to evade detection in the human body. This discovery may pave the way for new treatments aimed at combating this life-threatening disease.

Malaria, transmitted by mosquitoes, reportedly infects around 1,000 children each day and results in approximately 500,000 deaths annually, primarily in South America and sub-Saharan Africa.

In a significant study published in Cell Reports, scientists from the Weizmann Institute of Science in Rehovot found that malaria parasites send packets of their own messenger RNA into human cells. This RNA infiltrates the cell nucleus, manipulating splicing activity to suppress immune responses before they can initiate.

The highlight of this research—a project impacted by an Iranian missile attack that damaged several labs—was the surprising detection of parasitic RNA in the nucleus of immune cells, a place it seemingly shouldn’t be.

“No one had seen this low level of the parasite’s messenger RNA in the nucleus using microscopy before,” noted Prof. Neta Regev-Rudzki, one of the lead researchers. “It was entirely unexpected.”

These findings could lead to innovative targets for antimalarial treatments, specifically aimed at preventing parasitic RNAs from commandeering the host’s splicing machinery.

Amy Buck, an RNA and Infection Biology professor at the University of Edinburgh, remarked that this research may have implications beyond malaria. She highlighted its potential relevance to various human diseases.

Understanding Malaria

Malaria is caused by parasites carried by female mosquitoes, which acquire the parasite by biting infected individuals. Millions are diagnosed each year, particularly in sub-Saharan Africa and South America. Though antimalarial treatments exist, their effectiveness diminishes as parasites develop resistance.

“We must find a way to halt this disease and alleviate the suffering it causes,” Regev-Rudzki expressed, stressing the need for effective vaccines against malaria.

Symptoms typically start with fever and chills, and if untreated, malaria can lead to severe complications, including organ failure and cerebral damage. The rapid destruction of red blood cells can result in fatalities within a short timeframe.

More than a decade ago, Regev-Rudzki found that the malaria parasite Plasmodium falciparum could invade human red blood cells while also communicating with one another via tiny vesicles filled with RNA.

“This research changed the perception that parasites only compete with one another; they can coordinate and collaborate,” she remarked.

Dr. Paula Abou Karam, who led the latest study, aimed to uncover further strategies that the parasites utilize to thrive in humans. Collaborations included scientists from several top institutions.

“We found that the parasites employ vesicles to not only communicate internally, but also to manipulate human immune cells by delivering misleading signals,” Regev-Rudzki stated.

The team initially struggled to detect the low levels of parasitic RNA within immune cell nuclei, but Abou Karam refused to abandon the task. Through the use of advanced microscopy techniques, she eventually succeeded in identifying these RNA molecules.

“Each time a malaria mRNA molecule crossed into the nucleus, it created a notable marker,” she explained.

Subsequently, the researchers collaborated with Dr. Zeev Melamed, an expert in RNA and splicing, to investigate how these foreign RNAs infiltrated human cells. They discovered that the malaria mRNA binds to specific human proteins meant to relay messages that activate immune responses, but instead, these are transformed into useless information.

While some defensive response is triggered, it inadvertently directs immune cells away from the red blood cells, allowing the malaria parasites to multiply unimpeded.

Just as they were finalizing their study, an Iranian missile struck the Weizmann Institute, causing chaos but thankfully leaving their laboratory intact.

“The attack resulted in a loss of many research facilities, but we adapted quickly,” Abou Karam recounted, drawing on her past experiences of upheaval and change.

Regev-Rudzki insisted on persevering, stating, “We had to continue, because otherwise, they won. Science knows no boundaries.”