zika virus Hijacks Cell ‘Self-Care’ to Boost Infection

Updated‍ May ⁢28, 2025

The Zika virus employs a cunning strategy to ensure its infectious success: it exploits the host cell’s own waste-disposal system to disarm antiviral defenses. According to a new study,Zika⁢ manipulates autophagy,a cellular “self-care” process,to degrade host proteins that would otherwise block viral entry and replication. This discovery sheds light on the biological mechanisms behind ⁤Zika’s ability to establish infection.

Researchers found ⁣that the virus uses this manipulation to lower the activity of cell surface⁢ proteins, clearing the path for infection. While other viruses like HIV are known to⁣ silence host receptors, Zika is unique in that it‍ uses multiple proteins to achieve this effect, said shan-Lu Liu, virology professor at The Ohio state University and senior author of the study.

The study,‍ published in Proceedings of the National Academy of Sciences, highlights the virus’s ability ⁢to control its own⁢ destiny by suppressing the host’s protective mechanisms.

Zika virus, primarily transmitted by Aedes aegypti mosquitoes, has caused outbreaks across Africa, the Americas, Asia, and the Pacific. While cases ⁣have decreased as 2017, transmission continues in endemic regions. ‍The 2015 epidemic in Brazil confirmed a link between Zika infection during pregnancy and congenital problems, including microcephaly.

The research team, led by Liu, focused on AXL and TIM-1, two cell surface proteins previously linked to Zika infection. they discovered that Zika utilizes autophagy to suppress these proteins after gaining entry into cells. experiments ⁣using African and⁢ Asian strains of the virus in lung, trophoblast, and glioblastoma cells confirmed⁤ that AXL and TIM-1 ⁣were downregulated following infection.

Liu, also associate director‍ of Ohio State’s Center⁣ for ⁢Retrovirus Research, explained that autophagy is a basic process where cells degrade damaged components.⁤ By manipulating this⁣ process, Zika forces ⁢host cells to suppress their own protective proteins.

Without this suppression, AXL and TIM-1 would trigger an antiviral response. Furthermore, their normal function of ⁢facilitating viral entry could lead ⁤to superinfection, a scenario where too many Zika particles overcrowd⁣ already-infected cells, threatening the virus’s survival.

Further experiments identified three Zika proteins located on the virus’s membrane that induce host cell autophagy. These proteins, normally involved in viral entry or replication, also play a role in downregulating host defenses.

“That’s the most interesting part: It’s amazing that not only one, but several Zika proteins can do ⁢this,” Liu said. “We‍ looked at two zika virus ⁣strains and examined three physiologically relevant cell types. With both strains, we could see the downregulation in all three cell types. It looks like this is⁣ an significant mechanism.”

What’s next

The researchers suggest this mechanism ⁢might also be relevant to other viruses, such as Ebola, which ⁣uses⁢ the TIM-1 protein, or other flaviviruses⁣ like West Nile, yellow⁢ fever, and dengue. Further research is needed to confirm these possibilities.