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Kobayashi JI, Hirasawa H, Fujimori Y, Nakanishi O, Kamada N, Ikeda T, Yamamoto A, Kanbe H. Identification of N-acyl-N-indanyl-α-phenylglycinamides as selective TRPM8 antagonists designed to mitigate the risk of adverse effects. Bioorg Med Chem 2020; 30:115903. [PMID: 33333445 DOI: 10.1016/j.bmc.2020.115903] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 11/26/2020] [Indexed: 01/09/2023]
Abstract
Transient receptor potential melastatin 8 (TRPM8), a temperature-sensitive ion channel responsible for detecting cold, is an attractive molecular target for the treatment of pain and other disorders. We have previously discovered a selective TRPM8 antagonist, KPR-2579, which inhibited bladder afferent hyperactivity induced by acetic acid instillation into the bladder. However, additional studies have revealed potential adverse effects with KPR-2579, such as the formation of a reactive metabolite, CYP3A4 induction, and convulsions. In this report, we describe the optimization of α-phenylglycinamide derivatives to mitigate the risk of these adverse effects. The optimal compound 13x exhibited potent inhibition against icilin-induced wet-dog shakes and cold-induced frequent voiding in rats, with a wide safety margin against the potential side effects.
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Affiliation(s)
- Jun-Ichi Kobayashi
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan.
| | - Hideaki Hirasawa
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
| | - Yoshikazu Fujimori
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
| | - Osamu Nakanishi
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
| | - Noboru Kamada
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
| | - Tetsuya Ikeda
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
| | - Akitoshi Yamamoto
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
| | - Hiroki Kanbe
- Discovery Research, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Hotaka kashiwabara, Azumino, Nagano 399-8304, Japan
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