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1.
J Med Chem ; 62(5): 2265-2285, 2019 Mar 14.
Artigo em Inglês | MEDLINE | ID: mdl-30785748

RESUMO

Recently, our research group reported the identification of BMS-986104 (2) as a differentiated S1P1 receptor modulator. In comparison to fingolimod (1), a full agonist of S1P1 currently marketed for the treatment of relapse remitting multiple sclerosis (RRMS), 2 offers several potential advantages having demonstrated improved safety multiples in preclinical evaluations against undesired pulmonary and cardiovascular effects. In clinical trials, 2 was found to exhibit a pharmacokinetic half-life ( T1/2) longer than that of 1, as well as a reduced formation of the phosphate metabolite that is required for activity against S1P1. Herein, we describe our efforts to discover highly potent, partial agonists of S1P1 with a shorter T1/2 and increased in vivo phosphate metabolite formation. These efforts culminated in the discovery of BMS-986166 (14a), which was advanced to human clinical evaluation. The pharmacokinetic/pharmacodynamic (PK/PD) relationship as well as pulmonary and cardiovascular safety assessments are discussed. Furthermore, efficacy of 14a in multiple preclinical models of autoimmune diseases are presented.

2.
Toxicol Sci ; 122(2): 587-97, 2011 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-21561886

RESUMO

Organic anion-transporting polypeptides (Oatp) 1a1 and 1a4 were deleted by homologous recombination, and mice were characterized for Oatp expression in liver and kidney, transport in isolated hepatocytes, in vivo disposition of substrates, and urinary metabolomic profiles. Oatp1a1 and Oatp1a4 proteins were undetected in liver, and both lines were viable and fertile. Hepatic constitutive messenger RNAs (mRNAs) for Oatp1a4, 1b2, or 2b1 were unchanged in Oatp1a1⁻/⁻ mice, whereas renal Oatp1a4 mRNA decreased approximately 50% (both sexes). In Oatp1a4⁻/⁻ mice, no changes in constitutive mRNAs for other Oatps were observed. Uptake of estradiol-17ß-D-glucuronide and estrone-3-sulfate in primary hepatocytes decreased 95 and 75%, respectively, in Oatp1a1⁻/⁻ mice and by 60 and 30%, respectively, in Oatp1a4⁻/⁻ mice. Taurocholate uptake decreased by 20 and 50% in Oatp1a1⁻/⁻ and Oatp1a4⁻/⁻ mice, respectively, whereas digoxin was unaffected. Plasma area under the curve (AUC) for estradiol-17ß-D-glucuronide increased 35 and 55% in male and female Oatp1a1⁻/⁻ mice, respectively, with a concurrent 50% reduction in liver-to-plasma ratios. In contrast, plasma AUC or tissue concentrations of estradiol-17ß-D-glucuronide were unchanged in Oatp1a4⁻/⁻ mice. Plasma AUCs for dibromosulfophthalein increased nearly threefold in male Oatp1a1⁻/⁻ and Oatp1a4⁻/⁻ mice, increased by 40% in female Oatp1a4⁻/⁻ mice, and were unchanged in female Oatp1a1⁻/⁻ mice. In both lines, no changes in serum ALT, bilirubin, and cholesterol were noted. NMR analyses showed no generalized increase in urinary excretion of organic anions. However, urinary excretion of taurine decreased by 30-40% and was accompanied by increased excretion of isethionic acid, a taurine metabolite generated by intestinal bacteria, suggesting some perturbations in intestinal bacteria distribution.


Assuntos
Deleção de Genes , Recombinação Homóloga , Metabolômica , Transportadores de Ânions Orgânicos/metabolismo , Animais , Área Sob a Curva , Transporte Biológico/genética , Western Blotting , Estradiol/análogos & derivados , Estradiol/sangue , Estradiol/farmacocinética , Estrona/análogos & derivados , Estrona/sangue , Estrona/farmacocinética , Feminino , Hepatócitos/efeitos dos fármacos , Ácido Isetiônico/urina , Rim/efeitos dos fármacos , Fígado/efeitos dos fármacos , Masculino , Camundongos , Camundongos Knockout , Transportadores de Ânions Orgânicos/genética , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Taurina/urina , Ácido Taurocólico/farmacocinética
3.
Magn Reson Chem ; 47 Suppl 1: S12-9, 2009 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-19768707

RESUMO

In the present study, NMR-based urinary metabonomic profiles resulting from dosing with widely recognized microsomal enzyme inducers were evaluated in male rats. Wistar or Sprague-Dawley rats were dosed daily by oral gavage with phenobarbital (PB; 100 mg/kg), diallyl sulfide (DAS; 500 mg/kg), the investigational compound DMP-904 (150 mg/kg), or beta-naphthoflavone (BNF; 100 mg/kg) for 4 days, and urine was collected daily for analysis. Compounds known to increase cytochrome P450 2B enzymes, including PB, DAS and DMP-904, increased the urinary excretion of gulonic and ascorbic acid in a time-dependent manner, reaching a maximum following 3-4 days of dosing. In contrast, BNF, an agent that induces primarily Cyp1A enzymes, did not increase gulonic or ascorbic acid excretion, despite inducing Cyp1A1 more than 200-fold. Given the metabonomic results, hepatic transcriptional changes in the regulation of ascorbic acid biosynthesis were determined by RT-PCR. All Cyp2B inducers increased hepatic mRNA levels of aldo-keto reductase 1A1, an enzyme that catalyzes the formation of gulonic acid from glucuronate with concurrent decreased expression of both regucalcin (Rgn), the enzyme responsible for conversion of gulonic acid to gulono-1, 4-lactone and gulonolactone oxidase (Gulo), the rate-limiting enzyme in ascorbate biosynthesis. These effects would be expected to increase levels of gulonic acid. In addition, Cyp2B inducers also increased hepatic expression of enzymes regulating ascorbic acid reutilization including glutaredoxin reductase (Glrx2) and thioredoxin reductase (Txnrd1). In contrast, BNF did not effect hepatic expression of any enzyme regulating gulonic or ascorbic acid biosynthesis. Thus, some microsomal enzyme inducers alter transcriptional regulation of ascorbic acid biosynthesis, and these changes are detected by noninvasive metabonomic profiling. However, not all microsomal enzyme inducers appear to alter ascorbic acid metabolism. Finally, the work illustrates how metabonomic results can direct additional studies to determine the biochemical mechanisms underlying changes in urinary metabolite excretion.


Assuntos
Ácido Ascórbico/metabolismo , Sistema Enzimático do Citocromo P-450/metabolismo , Metabolômica , Açúcares Ácidos/metabolismo , Compostos Alílicos/farmacologia , Animais , Ácido Ascórbico/urina , Sistema Enzimático do Citocromo P-450/efeitos dos fármacos , Sistema Enzimático do Citocromo P-450/genética , Perfilação da Expressão Gênica , Fígado/enzimologia , Fígado/metabolismo , Espectroscopia de Ressonância Magnética , Masculino , Fenobarbital/farmacologia , Ratos , Ratos Sprague-Dawley , Ratos Wistar , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Açúcares Ácidos/urina , Sulfetos/farmacologia , Fatores de Tempo , Ativação Transcricional
4.
Toxicol Sci ; 108(2): 482-91, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-19211616

RESUMO

The hepatobiliary disposition of thyroxine (T4) was evaluated in Groningen Yellow transport deficient (TR(-)) rats lacking functional multidrug resistance-associated protein 2 (Mrp2; Abcc2). Male Wistar and TR(-) rats were dosed orally (4 days) with phenobarbital (PB; 100 mg/kg) or DMP 904 (200 mg/kg), after which T4 homeostasis and hepatic cytochromes P450, UDP-glucuronosyltransferase, xenobiotic transporters, and T4 glucuronidation were determined. Serum concentrations of T4 were approximately 50% higher in control TR(-) rats than Wistars. PB and DMP 904 increased hepatic levels of P450s and T4-glucuronidation (T4-G), and these changes were associated with decreased serum T4 levels in both strains. In Wistar but not TR(-) rats, DMP 904 increased thyroid stimulating hormone levels twofold. Hepatobiliary clearance of T4 was determined after intravenous infusion of [(125)I]T4 to rats dosed with PB and DMP 904 (4 days). PB and DMP 904 increased plasma clearance and hepatic uptake of [(125)I]T4 equivalents in Wistar but not TR(-) rats. Total biliary clearance (Cl(bile)) was approximately 0.85 and 0.2 ml/h in Wistar and TR(-) rats, respectively, with virtually no T4-G excreted in bile in TR(-) rats. Biliary clearance of unconjugated T4 was also lower in control TR(-) rats than in Wistars, although DMP 904 increased its biliary clearance in both strains. These results suggest that Mrp2 is likely to be responsible for biliary excretion of T4-G and contributes in part to excretion of T4. Decreased biliary clearance of T4 and metabolites in TR(-) rats mitigated but did not prevent drug-induced changes in serum T4, suggesting that other factors contribute to changes in T4 homeostasis in these rats.


Assuntos
Transportadores de Cassetes de Ligação de ATP/genética , Transportadores de Cassetes de Ligação de ATP/fisiologia , Bile/metabolismo , Sistema Biliar/metabolismo , Hipotireoidismo/induzido quimicamente , Hipotireoidismo/metabolismo , Fígado/metabolismo , Receptores dos Hormônios Tireóideos/genética , Hormônios Tireóideos/metabolismo , Tiroxina/metabolismo , Xenobióticos/toxicidade , Animais , Animais Geneticamente Modificados , Sistema Biliar/patologia , Proliferação de Células/efeitos dos fármacos , Cromatografia Líquida de Alta Pressão , Glucuronídeos/metabolismo , Homeostase/fisiologia , Fígado/patologia , Masculino , Microssomos Hepáticos/efeitos dos fármacos , Microssomos Hepáticos/metabolismo , RNA Mensageiro/biossíntese , RNA Mensageiro/genética , Ratos , Ratos Wistar , Glândula Tireoide/metabolismo , Glândula Tireoide/patologia , Tireotropina/metabolismo , Tri-Iodotironina/metabolismo
5.
Drug Metab Dispos ; 36(2): 303-15, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-17984286

RESUMO

Razaxaban is a selective, potent, and orally bioavailable inhibitor of coagulation factor Xa. The molecule contains a 1,2-benzisoxazole structure. After oral administration of [(14)C]razaxaban to intact and bile duct-cannulated rats (300 mg/kg) and dogs (20 mg/kg), metabolism followed by biliary excretion was the major elimination pathway in both species, accounting for 34 to 44% of the dose, whereas urinary excretion accounted for 3 to 13% of the dose. Chromatographic separation of radioactivity in urine, bile, and feces of rats and dogs showed that razaxaban was extensively metabolized in both species. Metabolites were identified on the basis of liquid chromatography/tandem mass spectrometry and comparison with synthetic standards. Among the 12 metabolites identified, formation of an isoxazole-ring opened benzamidine metabolite (M1) represented a major metabolic pathway of razaxaban in rats and dogs. However, razaxaban was the major circulating drug-related component (>70%) in both species, and M1, M4, and M7 were minor circulating components. In addition to the in vivo observations, M1 was formed as the primary metabolite in rat and dog hepatocytes and in the rat liver cytosolic fraction. The formation of M1 in the rat liver fraction required the presence of NADH. Theses results suggest that isoxazole ring reduction, forming a stable benzamidine metabolite (M1), represents the primary metabolic pathway of razaxaban in vivo and in vitro. The reduction reaction was catalyzed by NADH-dependent reductase(s) in the liver and possibly by intestinal microflora on the basis of the recovery of M1 in feces of bile duct-cannulated rats.


Assuntos
Anticoagulantes/farmacocinética , Isoxazóis/farmacocinética , Pirazóis/farmacocinética , Animais , Anticoagulantes/sangue , Anticoagulantes/urina , Benzamidinas/metabolismo , Bile/química , Biotransformação , Células Cultivadas , Cães , Fezes/química , Hepatócitos/metabolismo , Isoxazóis/sangue , Isoxazóis/metabolismo , Isoxazóis/urina , Fígado/metabolismo , Masculino , Oxirredução , Pirazóis/sangue , Pirazóis/urina , Ratos , Ratos Sprague-Dawley
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