Loss of Akt3 enhances antiviral immunity while disrupting corneal homeostasis during ocular HSV-1 infection.

BACKGROUND

Akt1 and Akt2 isoforms reveal distinct immune-regulatory roles in HSV-1 pathogenesis. Akt3 is a developmentally important protein, and mutations in Akt3 gene are associated with a wide spectrum of developmental disorders, including extreme megalencephaly; however, its role in corneal homeostasis and pathologies remains poorly understood. Here we investigated the role of Akt3 in HSV-1 infection.

METHODS

In vivo HSV-1 infection was performed using WT, Akt3 homozygous, and heterozygous mutant mice via corneal scarification to assess disease outcomes. Viral replication was quantified by plaque assays from ocular samples at defined time points. Mice were subjected to ex vivo and in vitro analyses, including flow cytometry, ELISA, and neutralization assays, to comprehensively evaluate innate and adaptive immune responses.

RESULTS

In this study, we report the significance of the Akt3 isoform in HSV-1 viral pathogenesis. Loss of Akt3 at baseline results in spontaneous corneal opacity, suggesting it is a critical regulator of ocular homeostasis. Despite this baseline compromise, Akt3 deficient mice appear to be better protected against HSV-1 infection, showing lower titers and better survivability. Loss of Akt3 plays a unique role in regulating type 1 interferon production necessary for combating viral infection, along with demonstrating significantly higher serum neutralizing capacity compared to WT controls.

CONCLUSION

Akt3 deficiency reconfigures the innate-adaptive interface acting as a negative modulator of the antiviral response during HSV-1 infection.