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- W2152469016 abstract "Cam-2445 is a selective, high-affinity NK1receptor antagonist that is a potentially useful treatment for arthritis, asthma, migraine, anxiety, psychosis, and emesis. Cam-2445 exhibits low aqueous solubility and high lipophilicity and has a molecular weight of 470. Cam-2445 has poor oral bioavailability and the purpose of this research was to examine the potential barriers to the oral bioavailability of Cam-2445. Cam-2445 was relatively stable at 37 °C in 0.1 N HCI, 5μM α-chymotrypsin, rat intestinal perfusate, and in rat jejunal brush border membrane suspension. High permeability was observed from CACO-2 cells and from rat single-pass intestinal perfusions. Cam-2445 was administered as a solution to rats by intravenous (iv), oral (po), intraduodenal (id.), and intraportal (ipv) routes. The total oral bioavailability was poor at 1.4%. Absorption appeared to be rapid after id. dosing; bioavailability was 26%, and 54% of the dose was absorbed intact into the portal system. After ipv dosing, 48% of the dose was available to the systemic circulation. The elimination t1/2 after id. dosing (2.91 h) was comparable to that after iv dosing (2.93 h), whereas it was significantly longer after po dosing (12.4 h). The po dose apparently precipitated in the gastrointestinal (Gl) tract, resulting in low oral bioavailability. These results indicated that neither stability in the GI tract nor membrane transport were major obstacles to the absorption of Cam-2445. While hepatic extraction of 52% was significant, the low aqueous solubility of Cam-2445, as well as the differences noted between po and id. studies, strongly support Gl dissolution and/or precipitation as the limiting factor for the oral bioavailability of the compound." @default.
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- W2152469016 date "1996-03-01" @default.
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- W2152469016 title "Absorption of Cam-2445, an NK1 Neurokinin Receptor Antagonist: In Vivo, In Situ, and In Vitro Evaluations" @default.
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- W2152469016 doi "https://doi.org/10.1021/js9503338" @default.
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