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Supramolecule-Driven Host-Guest Co-Crystallization of Cyclic Polyphenols with Anti-Fibrotic Pharmaceutical Drug

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CRYSTAL GROWTH & DESIGN
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AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.2c00895

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Host-guest complexes have great potential as supra-molecular drugs in pharmaceutical sciences due to their ability to enhance the activity of antibacterial agents. This study investigated the complexation of macrocyclic hosts with pirfenidone, a FDA-approved antifibrotic drug, to develop a microbiologically potent supramolecular drug. The results revealed an unprecedented interplay between the antibacterial activity of the hosts and their chemical interaction with pirfenidone, thereby improving the overall antibacterial activity of the drug.
Host-guest complexes are of interest as supra-molecular drugs in pharmaceutical sciences because the activity of antibacterial agents can be enhanced upon complexation with various cyclic oligomers or metal ions, with some complexes possessing higher healing properties than the parent drugs. Herein, to develop a microbiologically potent supramolecular drug, we investigated the complexation of macrocyclic hosts (resorcinarenes and beta-cyclodextrin) with pirfenidone (PFD), an FDA-approved antifibrotic drug containing an antibacterial pyridone core. Electronic structure calculations gave insights into the interactions in the host-PFD complexes. Further, complex formation and clinical activities were investigated using spectroscopic techniques and in vitro measurements of antibacterial activity against Gram-positive and Gram-negative bacteria. An unprecedented interplay between the antibacterial activity of the polyphenolic resorcinarene hosts and their ability to interact chemically with PFD was found to improve the overall antibacterial activity of PFD. These results could revolutionize the use of synthetically modifiable resorcinarene and their analogues for fine-tuning the clinical behavior of drugs.

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