[Biological activity of the poly(G).poly(C) complex, modified by divalent platinum compounds]

Area of Science:

• Virology
• Immunology
• Medicinal Chemistry

Context:

• Poly(G).poly(C) is a synthetic nucleic acid complex with known immunomodulatory and antiviral properties.
• Platinum-based compounds, such as cisplatin derivatives, are investigated for their therapeutic potential.
• Understanding structure-activity relationships is crucial for developing effective antiviral agents.

Purpose:

• To investigate the effect of modification with platinum complexes on the antiviral and interferon-inducing activity of poly(G).poly(C).
• To compare the efficacy of different platinum compounds (cys-DDP and trans-DDP) and modification methods on anti-influenza activity.
• To determine the optimal level of platinum modification (rb) for enhanced biological activity.

Summary:

• Modification of poly(G).poly(C) with cys-diaminodichloroplatinum (cys-DDP) at rb = 0.02 significantly increased in vivo antiviral and interferon-inducing activity.
• Anti-influenza activity was more pronounced when the pre-formed poly(G).poly(C) complex was treated with cys-DDP, compared to modifying poly(G) prior to complex formation.
• Increasing the rb level beyond 0.02 resulted in a reduction of activity. Trans-diamminedichloroplatinum (trans-DDP) also enhanced anti-influenza activity, particularly when poly(G) was pretreated.

Impact:

• This study highlights a method for enhancing the antiviral efficacy of poly(G).poly(C) through specific platinum compound modification.
• The findings suggest that the method and level of platinum incorporation are critical factors in modulating the biological activity of nucleic acid complexes.
• This research could inform the development of novel platinum-modified nucleic acid-based therapeutics for influenza and other viral infections.