Viral immunology

Navigating the Host-Pathogen Dance

Viruses are master manipulators, exploiting host biology to survive while the immune system mobilizes an intricate defense. Pioneering work by scientists like Ralph Baric on coronavirus pathogenesis, Stanley Perlman on viral immunopathology, and Antonio Lanzavecchia on dendritic cell responses has shaped our understanding of how immune cells distinguish friend from foe and orchestrate antiviral defenses. These studies illustrate that effective therapy requires fine-tuned modulation, not blunt suppression or indiscriminate activation.

Early Lessons: Masters Research

During my Master’s studies, I explored Newcastle disease virus (NDV) infection in poultry, investigating how immune modulation could control viral replication. In our work, the antiparasitic drug Nitazoxanide (NTZ) was repurposed to target NDV in chicken fibroblasts, PBMCs, embryonated eggs, and young chickens. NTZ not only inhibited viral replication but also enhanced cytokine responses, demonstrating immune-modulatory potential.

This early experience was formative: it showed me that strategically modulating host immunity can complement antiviral strategies, and that even small molecular interventions can have profound effects on virus-host dynamics. It laid the foundation for my PhD work, where the focus shifted from poultry viruses to complex mammalian viral infections.

Antony, F., Vashi, Y., Morla, S., Mohan, H., & Kumar, S. (2020). Therapeutic potential of Nitazoxanide against Newcastle disease virus: a possible modulation of host cytokines. Cytokine, 131, 155115.
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PhD Work: Balancing Viral Clearance and Tissue Protection

At the PhD level, I studied HSV-1 ocular infection, where immune responses are double-edged: neutrophils clear virus but prolonged inflammation damages sensitive corneal tissue. My research focused on leveraging cytokines to optimize outcomes, using IFN-λ and IL-27 to clear virus while minimizing immunopathology.

In mouse models:

• IFN-λ therapy reduced neutrophil and macrophage infiltration and suppressed inflammatory cytokines (IL-6, IL-1β, CXCL-1) without compromising antiviral function.

• IL-27 signaling enhanced antiviral macrophage activity, promoted effector CD4+ T cell responses, and limited tissue damage.

These studies demonstrated that cytokines act as both immune regulators and therapeutic levers, and that timing, context, and dosage are critical for translating mechanistic insight into safe and effective interventions.

Antony, F., Kinha, D., Nowinska, A., Rouse, B. T., & Suryawanshi, A. (2024). The immunobiology of corneal HSV-1 infection and herpetic stromal keratitis. Clinical Microbiology Reviews, e00006-24.
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Antony, F., Pundkar, C., Sandey, M., & Suryawanshi, A. (2023). Role of IL-27 in HSV-1–Induced Herpetic Stromal Keratitis. The Journal of Immunology.
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Ren, J., Antony, F., Rouse, B. T., & Suryawanshi, A. (2023). Role of Innate Interferon Responses at the Ocular Surface in Herpes Simplex Virus-1–Induced Herpetic Stromal Keratitis. Pathogens, 12(3), 437.
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Antony, F., Pundkar, C., ... & Suryawanshi, A. (2021). IFN-λ Regulates Neutrophil Biology to Suppress Inflammation in Herpes Simplex Virus-1–Induced Corneal Immunopathology. The Journal of Immunology, 206(8), 1866–1877.
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Translational Perspective: Toward Precision Antiviral Immunotherapy

The lessons from viral immunology extend beyond HSV-1 or NDV: controlling pathogenic inflammation while preserving immunity is central to combating viral diseases in general. Cytokine-based modulation offers a framework for precision immunotherapy, where host-directed approaches complement direct antiviral strategies.

Ongoing studies in the field of viral vaccines and cytokine therapies—ranging from interferon therapies in respiratory viruses to engineered immunomodulatory biologics—illustrate the potential of targeted immune recalibration. My work provides a mechanistic foundation for these approaches, demonstrating that rationally timed cytokine interventions can enhance viral clearance while minimizing tissue injury.