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.