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Tuberculosis is a serious public health problem worldwide. The search for new antibiotics has become a priority, especially with the emergence of resistant strains. A new family of imidazoquinoline derivatives, structurally analogous to triazolophthalazines, which had previously shown good antituberculosis activity, were designed to inhibit InhA, an essential enzyme for survival. Over twenty molecules were synthesized and the results showed modest inhibitory efficacy against the protein. Docking experiments were carried out to show how these molecules could interact with the protein's substrate binding site. Disappointingly, unlike triazolophthlazines, these imidazoquinoline derivatives showed an absence of inhibition on mycobacterial growth.
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http://dx.doi.org/10.3390/molecules29133076 | DOI Listing |
Cancer Med
May 2025
Department of Urology, Kochi Medical School, Nankoku, Japan.
Purpose: Imiquimod (IQM), an imidazoquinoline derivative, is an immunomodulator that activates an adaptive immune response. IQM is applied topically for genital warts and actinic keratosis. Programmed cell death-1 (PD-1) suppresses activated T cells by binding to programmed cell death-ligand 1 and programmed cell death-ligand 2, braking antitumor immunity.
View Article and Find Full Text PDFFuture Med Chem
April 2025
Department of Chemistry, Rabindranath Tagore University, Hojai, India.
The challenges in drug discovery aiming to mitigate cancer progression are the thrust area of scientific research for several decades. Since the advent of heterocyclic chemistry, drug discovery programs have made significant achievements that lead to the development of numerous drugs with broad spectrum of potencies, contributing to both diagnostic and therapeutic advancements. Till date, efforts to discover more potent and efficient drug candidates are underway to minimize adverse side effects of existing chemotherapeutics.
View Article and Find Full Text PDFAdv Mater
February 2025
State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Lymph nodes are crucial immune foci as the primary target for cancer immunotherapy. However, the anti-tumor functions of tumor-draining lymph nodes (TDLNs) are critically suppressed by tumors. Here, a novel spatiotemporal nano-regulator is presented, designed to modulate the dendritic cells (DCs) in TDLNs, establishing a supportive niche for immune surveillance.
View Article and Find Full Text PDFACS Med Chem Lett
October 2024
Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India.
Toll-like receptor (TLR)-7/8 agonists are promising candidates for the development of new-generation vaccine adjuvants. Adsorption of TLR7/8 agonists on aluminum salts (alum) may further enhance vaccine immunogenicity. Evaluation of the adjuvanticity of the most active dual TLR7/8 agonists, 1-(3-(aminomethyl)benzyl)-2-butyl-1-imidazo[4,5-]quinolin-4-amine (-AM-BBIQ, ) and its derivative -AM-BBIQ (), along with their gallic acid and protocatechuic acid amides in a recombinant-protein-based COVID-19 vaccine platform confirmed the importance of -polyphenolic functionality in TLR7/8 agonists for the alum adsorption, thereby resulting in a balanced Th1/Th2 immune response.
View Article and Find Full Text PDFACS Pharmacol Transl Sci
July 2024
Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India.
TLR-7/8 agonists are a well-known class of vaccine adjuvants, with a leading example now included in Covaxin, a licensed human COVID-19 vaccine. This thereby provides the opportunity to develop newer, more potent adjuvants based on structure-function studies of these classes of compounds. Imidazoquinoline-based TLR7/8 agonists are the most potent, but when used as a vaccine adjuvant side effects can arise due to diffusion from the injection site into a systemic circulation.
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