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Synthesis of Novel 8-Hydroxyquinoline Derivatives through Mannich Reaction and their Biological Evaluation as Potential Immunomodulatory Agents

Author(s):

Shaheen Faizia*, Tahira Sarfaraz, Saima Sumbul, Almas Jabeen, Sobia Ahsan Halim, Mohammad Ahmed Mesaik and Zaheer Ul-Haq   Pages 1 - 13 ( 13 )

Abstract:


Background: In continuation of our work on Mannich reaction on 8-hydroxyquinoline, fifteen different combinations of aromatic aldehydes and aniline were subjected to Mannich reaction from which twelve products (eight Mannich bases, two imines and two intramolecularly cyclized products with benzofuranone skeleton) were obtained. Among them six compounds (1, 2, 6, 8, 9 and 12) are new compounds. The structures of the compounds were characterized by UV, IR, MS and 1H NMR.

Method: The compounds were tested for the inhibition of pro-inflammatory cytokines tumor necrosis factor-α (TNF-α) and Interleukin-1β (IL-1β) at a concentration of 25 µg/mL. The cytokines were produced by THP-1 cells differentiated with PMA for 24hrs and stimulated with LPS for 4 hrs and supernatant were analyzed through ELISA technique.

Result/Discussion: Compounds 1-5, 8 and 9 inhibited the production of TNF-α and IL-1β. Compounds 1, 3, and 8 exerted potent inhibitions of TNF-α with 71%, 71%, and 83% inhibition, respectively. Compounds 1 and 8 significantly inhibited the production of IL-1β with 64% and 78% inhibition, respectively.

Conclusion: Compounds 1 and 8 significantly inhibited the production of IL-1β with 64% and 78% inhibition, respectively. Notably compound 8 showed most potent inhibition of these cytokines. Additionally, the effect of compounds on viability of THP-1 cells was also evaluated. Moreover, molecular docking was carried out to study the mechanism of inhibition of TNF-α production.

Keywords:

8-Hydroxyquinoline, Aromatic aldehydes, Aniline, Mannich base, Benzofuranone, Imine, Immunomodulatory, TNF-? and IL-1?, Molecular docking

Affiliation:

H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Industrial Analytical Center, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Natural and Medical Sciences Research Center, University of Nizwa, Nizwa 616, Department of Medical Microbiology, University of Tabuk, Tabuk 71491, Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270



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