Abstract:
:We describe the synthesis of analogs of XHE-III-74, a selective α4β3γ2 GABAAR ligand, shown to relax airway smooth muscle ex vivo and reduce airway hyperresponsiveness in a murine asthma model. To improve properties of this compound as an asthma therapeutic, a series of analogs with a deuterated methoxy group in place of methoxy group at C-8 position was evaluated for isotope effects in preclinical assays; including microsomal stability, cytotoxicity, and sensorimotor impairment. The deuterated compounds were equally or more metabolically stable than the corresponding non-deuterated analogs and increased sensorimotor impairment was observed for some deuterated compounds. Thioesters were more cytotoxic in comparison to other carboxylic acid derivatives of this compound series. The most promising compound 16 identified from the in vitro screens also strongly inhibited smooth muscle constriction in ex vivo guinea pig tracheal rings. Smooth muscle relaxation, determined by reduction of airway hyperresponsiveness with a murine ovalbumin sensitized and challenged model, showed that 16 was efficacious at low methacholine concentrations. However, this effect was limited due to suboptimal pharmacokinetics of 16. Based on these findings, further analogs of XHE-III-74 will be investigated to improve in vivo metabolic stability while retaining the efficacy at lung tissues involved in asthma pathology.
journal_name
Eur J Med Chemjournal_title
European journal of medicinal chemistryauthors
Jahan R,Stephen MR,Forkuo GS,Kodali R,Guthrie ML,Nieman AN,Yuan NY,Zahn NM,Poe MM,Li G,Yu OB,Yocum GT,Emala CW,Stafford DC,Cook JM,Arnold LAdoi
10.1016/j.ejmech.2016.11.045subject
Has Abstractpub_date
2017-01-27 00:00:00pages
550-560eissn
0223-5234issn
1768-3254pii
S0223-5234(16)30983-7journal_volume
126pub_type
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