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• W3008651805 abstract "We describe the effects of pH on the structure and bioavailability of MIDD0301, an oral lead compound for asthma. MIDD0301 interacts with peripheral GABAA receptors to reduce lung inflammation and airway smooth muscle constriction. The structure of MIDD0301 combines basic imidazole and carboxylic acid function in the same diazepine scaffold, resulting in high solubility at neutral pH. Furthermore, we demonstrated that MIDD0301 can interconvert between a seven-membered ring structure at neutral pH and an acyclic compound at or below pH 3. Both structures have two stable conformers in solution that can be observed by 1H NMR at room temperature. Kinetic analysis showed opening and closing of the seven-membered ring of MIDD0301 at gastric and intestinal pH, occurring with different rate constants. However, in vivo studies showed that the interconversion kinetics are fast enough to yield similar MIDD0301 blood and lung concentrations for neutral and acidic formulations. Importantly, acidic and neutral formulations of MIDD0301 exhibit high lung distribution with low concentrations in brain. These findings demonstrate that MIDD0301 interconverts between stable structures at neutral and acidic pH without changes in bioavailability, further supporting its formulation as an oral asthma medication." @default.
• W3008651805 created "2020-03-06" @default.
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• W3008651805 date "2020-02-18" @default.
• W3008651805 modified "2023-10-17" @default.
• W3008651805 title "The Effects of pH on the Structure and Bioavailability of Imidazobenzodiazepine-3-Carboxylate MIDD0301" @default.
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• W3008651805 doi "https://doi.org/10.1021/acs.molpharmaceut.9b01210" @default.
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