Image of the Day: Cryptosporidiosis Treatment
Image of the Day: Cryptosporidiosis Treatment

Image of the Day: Cryptosporidiosis Treatment

An enzyme blocker is highly effective at treating intestinal parasitic infection in mice.

Nov 8, 2019
Emily Makowski
ABOVE: Untreated mouse intestine (left) compared to mouse intestine treated with AN3661 (right)
C. SWALE ET AL.

Cryptosporidiosis is a waterborne disease caused by a genus of single-celled parasites called Cryptosporidium. They are common worldwide and infect the intestines of humans and other animals, causing severe gastrointestinal symptoms. Researchers have identified a new anti-parasitic treatment that outperforms the current FDA-approved drug, nitazoxanide, in mice. Their findings were published in Science Translational Medicine Wednesday (November 6). 

Researchers led by biochemist Andrés Palencia and microbiologist Mohamed-Ali Hakimi, both at Université Grenoble Alpes, infected mice with Cryptosporidium parvum and treated them with the anti-parasitic compound AN3661, a type of drug known as a benzoxaborole. Previous research showed that AN3661 and other benzoxaboroles deter parasite growth in mice by blocking the enzyme CPSF3, which processes mRNA, inhibiting the parasite’s ability to divide. The new study evaluated the efficacy of AN3661 and found that it reduced the same amount of C. parvum parasites in mouse intestines at a dose 10 times lower than that of nitazoxanide.

Nitazoxanide is not very effective in immunocompromised people or young children, so AN3661 could be a promising method of treating cryptosporidiosis in these groups. “Our data provide insights that may help accelerate the development of next-generation anti-Cryptosporidium therapeutics,” the authors write in the paper.

AN3661 prevents Cryptosporidium mRNA from maturing.
C. SWALE ET AL.

C. Swale et al., “Metal-captured inhibition of pre-mRNA processing activity by CPSF3 controls Cryptosporidium infection,” Sci Transl Med, doi:10.1126/scitranslmed.aax7161, 2019.

Emily Makowski is an intern at The Scientist. Email her at emakowski@the-scientist.com