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Theranostics 2024; 14(7):2706-2718. doi:10.7150/thno.93883 This issue Cite

Research Paper

Hyperglycemia facilitates EV71 replication: Insights into miR-206-mediated regulation of G3BP2 promoting EV71 IRES activity

Rai-Hua Lai^1,2, Yen-Hung Chow^3,4, Yi-Wen Lin³, Nai-Hsiang Chung³, Shu-Wei Nien^2,5, Jyh-Lyh Juang^2✉

1. National Center for Geriatrics and Welfare Research, National Health Research Institutes, Miaoli, Taiwan.
2. Institute of Molecular and Genomic Medicine, National Health Research Institutes, Miaoli, Taiwan.
3. Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Zhunan Town, Miaoli County, Taiwan.
4. Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan.
5. Microarray Core Laboratory, National Health Research Institutes, Miaoli, Taiwan.

✉ Corresponding author: Email: Juangedu.tw.

Abstract

Background: Neurotropic virus infections actively manipulate host cell metabolism to enhance virus neurovirulence. Although hyperglycemia is common during severe infections, its specific role remains unclear. This study investigates the impact of hyperglycemia on the neurovirulence of enterovirus 71 (EV71), a neurovirulent virus relying on internal ribosome entry site (IRES)-mediated translation for replication.

Methods: Utilizing hSCARB2-transgenic mice, we explore the effects of hyperglycemia in EV71 infection and elucidate the underlying mechanisms.

Results: Remarkably, administering insulin alone to reduce hyperglycemia in hSCARB2-transgenic mice results in a decrease in brainstem encephalitis and viral load. Conversely, induced hyperglycemia exacerbates neuropathogenesis, highlighting the pivotal role of hyperglycemia in neurovirulence. Notably, miR-206 emerges as a crucial mediator induced by viral infection, with its expression further heightened by hyperglycemia and concurrently repressed by insulin. The use of antagomiR-206 effectively mitigates EV71-induced brainstem encephalitis and reduces viral load. Mechanistically, miR-206 facilitates IRES-driven virus replication by repressing the stress granule protein G3BP2.

Conclusions: Novel therapeutic approaches against severe EV71 infections involve managing hyperglycemia and targeting the miR-206-stress granule pathway to modulate virus IRES activity.

Keywords: hyperglycemia, neurovirulence, enterovirus, miR-206, internal ribosome entry site (IRES)

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