HSV-1 Infection Differentially Modulates NPY and VIP Neuropeptide Expression in the Mouse Brain and in Human Neuronal...

Area of Science:

• Neurovirology
• Neuroimmunology
• Molecular Neuroscience

Background:

• Neurotropic viruses like Herpes Simplex Virus type 1 (HSV-1) can cause severe acute encephalitis and chronic neuroinflammation, even in asymptomatic infections.
• Neuropeptides, including neuropeptide Y (NPY) and vasoactive intestinal peptide (VIP), are crucial neuroimmune mediators in the central nervous system (CNS), but their role in HSV-1 brain infections is poorly understood.
• Understanding the molecular mechanisms underlying HSV-1 neuropathogenesis is critical for developing effective therapeutic strategies.

Purpose of the Study:

• To investigate the expression dynamics of NPY and VIP during HSV-1 brain infection in mouse models and human neuroblastoma cells.
• To explore potential differences in neuropeptide regulation that may correlate with varying susceptibility to severe HSV-1 infection.
• To elucidate the relationship between HSV-1 neurovirulence, host factors, and neuropeptide modulation in the context of brain infection.

Main Methods:

• Utilized two mouse strains (BALB/c and C57BL/6) modeling symptomatic and asymptomatic human HSV-1 brain infections.
• Analyzed neuropeptide Y (NPY) and vasoactive intestinal peptide (VIP) mRNA expression in infected mouse brains and SH-SY5Y human neuroblastoma cells.
• Correlated neuropeptide expression patterns with viral neurovirulence and host susceptibility.

Main Results:

• HSV-1 brain infection significantly modulated the mRNA expression of NPY and VIP.
• The observed changes in NPY and VIP expression were dependent on the neurovirulence of the HSV-1 strain and the host's genetic susceptibility.
• Distinct expression patterns of NPY and VIP were observed between the symptomatic and asymptomatic infection models.

Conclusions:

• HSV-1 brain infection alters the expression of key neuropeptides (NPY and VIP) in a manner influenced by viral and host factors.
• These neuropeptide modulations may play a role in determining disease severity and the development of chronic neuroinflammatory damage following HSV-1 infection.
• Further research into NPY and VIP regulation during HSV-1 infection is warranted to understand their contribution to neuropathogenesis and identify potential therapeutic targets.