Title:Coumarin and Piperazine Conjugates as Selective Inhibitors of the Tumor-associated
Carbonic Anhydrase IX and XII Isoforms
Volume: 23
Issue: 10
Author(s): Aaftaab Sethi, Sharon Munagalasetty, Mohammed Arifuddin, Simone Carradori, Claudiu T. Supuran*, Ravi Alvala and Mallika Alvala*
Affiliation:
- Neurofarba Department,
Sezione di Scienze Farmaceutiche e Nutraceutiche, Laboratorio di Chimica Bioinorganica, Università degli Studi di Firenze,
Sesto Fiorentino, Florence, 50019, Italy
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education & Research, Hyderabad, Balanagar, India
- MARS Training Academy, Hyderabad, 500028, Telangana, India
Keywords:
Coumarin, carbonic anhydrase, molecular docking, modeling, synthesis, piperazine, isoform selectivity.
Abstract:
Background: Carbonic Anhydrases (CAs) are a family of metalloenzymes that catalyze the reversible interconversion
of CO2 and water to bicarbonate and proton. CA isoforms I, II, IX, and XII are considered physiologically
and pharmacologically relevant.
Objective: The objective of this study is to synthesize potent and selective tumor-associated CA IX and XII inhibitors.
Methods: A library of 17 coumarin derivatives clubbed with piperazine and benzyl moiety was designed, synthesized
and evaluated for its inhibitory effects and selectivity profile towards physiologically and pharmacologically relevant
CA isoforms I, II, IX, and XII.
Results: All the derivatives were found to be active against the tumor-associated isoforms IX and XII. The most active
compound against hCA (human Carbonic Anhydrase) IX was found to possess a Ki of 229 nM, while the one against
hCA XII had a Ki of 294.2 nM. Additionally, two of the compounds were found to have exquisite selectivity towards
the off-target hCA I and II isoforms. Moreover, they were found to be approximately 20-fold more selective towards
hCA IX than XII. The selectivity of the compounds was further investigated via molecular modeling techniques.
Conclusion: Coumarin-piperazine hybrids were identified as potent and selective CA IX and XII inhibitors. Molecular
modeling techniques provided interesting cues pertaining to observed selectivity.