BI 224436

Kinase experiment:

BI 224436 is dissolved in acetonitrile-methanol (50:50, vol/vol) to achieve a concentration of 1.5 mM. Phosphate buffer (pH 7.4), cofactor, and test substance or isoform-selective inhibitors are added to 96-well plates and are prewarmed to 37°C for 10 min. Cofactor concentrations are 1.3 mM NADP, 3.3 mM glucose-6-phosphate, and 0.4 U/mL glucose-6-phosphate dehydrogenase. Reactions are initiated by the addition of prewarmed (37°C) enzyme and substrate. Reaction mixtures are incubated at 37°C and terminated by the addition of 0.038 ml of 40:40:20 (vol/vol) methanol–acetonitrile–0.5 M Tris buffer. Formation of the fluorescent metabolites is measured using a microplate spectrofluorometer at specific excitation and emission wavelengths. The IC50 is determined using the 96-well 32 procedure supplied with the SAS software[1].

Animal experiment:

Rats: For oral PK studies, BI 224436 is administered in a suspension of 0.5% (wt/vol) methyl cellulose (MC), 0.3% (vol/vol) Tween 80, and 1% (vol/vol) N-methyl-2-pyrrolidine (MP) in water. For i.v. dosing, BI 224436 is dissolved in 70% PEG 400–30% water (vol/vol). The appropriate amount of BI 224436 is dissolved in PEG 400 with sonication. The rats receive a single i.v. dose of 0.2 mg/kg of body weight (1 mL/kg) via the jugular vein as a bolus or received a single oral dose of 0.4 mg/kg (10 mL/kg) administered by gavage. Blood samples are obtained at 0, 0.25, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, and 32 h after dosing for analysis[1].

References:

[1]. Fenwick C, et al. Preclinical profile of BI 224436, a novel HIV-1 non-catalytic-site integrase inhibitor. Antimicrob Agents Chemother. 2014 Jun;58(6):3233-44.