Immunomodulatory and Antimicrobial Effects of Pd(II)-Pincer-Type Complex

Area of Science:

• Immunology
• Medicinal Chemistry
• Microbiology

Background:

• A novel palladium(II) complex, [Pd(L1)Cl]Cl, with L1 = N²,N⁶-bis(5-methylhthiazol-2-yl)pyridine-2,6-dicarboxamide, was synthesized.
• This complex previously exhibited significant in vitro antitumor activity.

Purpose of the Study:

• To evaluate the immunomodulatory effects of the palladium(II) complex on splenocytes.
• To assess the antimicrobial potential of the palladium(II) complex against various microorganisms.

Main Methods:

• Splenocytes were stimulated with lipopolysaccharide (LPS) or Concanavalin A (ConA) in the presence of the Pd(II) complex.
• Cytokine levels (IFN-γ, IL-17, IL-4, TNF-α, IL-1β, IL-10) were quantified using ELISA.
• Antimicrobial activity was determined by Minimal Inhibitory Concentration (MIC) and Minimal Bactericidal/Fungicidal Concentrations (MBC/MFC).

Main Results:

• The Pd(II) complex increased the concentration of all tested cytokines in splenocytes.
• Co-treatment with LPS and the Pd(II) complex significantly elevated IFN-γ, IL-1β, and IL-17 levels.
• Co-treatment with ConA and the Pd(II) complex significantly increased TNF-α and IL-17, while decreasing IL-10, IL-4, and IFN-γ.
• The complex displayed weak to moderate antimicrobial activity, with Gram-positive bacteria being more susceptible than Gram-negative bacteria.

Conclusions:

• The palladium(II) complex possesses significant immunomodulatory properties, affecting cytokine profiles in splenocytes.
• The complex exhibits weak to moderate antimicrobial activity, suggesting potential therapeutic applications.