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Levocabastine is a new H(1)-receptor antagonist specifically developed for the topical treatment of seasonal allergic rhinoconjunctivitis. Clinical experience to date clearly demonstrates that levocabastine eye drops and nasal spray are effective and well tolerated for the treatment of this allergic disorder. Analysis of data from a number of comparative trials reveals that topical levocabastin...
INTRODUCTION The cardiac action potential (CAP) of stem cell-derived human cardiomyocytes (SC-hCMs) is potentially the most powerful preclinical biomarker for cardiac safety and efficacy in humans. Our experiments tested this hypothesis by examining the CAP and relevant pharmacology of these cells. METHODS The electrophysiological and pharmacological profiles of SC-hCMs were compared to rabbi...
INTRODUCTION Multi-electrode array (MEA) systems and human induced pluripotent stem (iPS) cell-derived cardiomyocytes are frequently used to characterize the electrophysiological effects of drug candidates for the prediction of QT prolongation and proarrhythmic potential. However, the optimal experimental conditions for obtaining reliable experimental data, such as high-pass filter (HPF) freque...
Nonsedating H1 receptor (H1-R) antagonists exert variable effects on QT interval, most likely mediated through modulation of cardiac K+ channels. We examined the effects of a novel H1-R antagonist, ebastine, on a family of K+ currents in isolated rat and guinea pig ventricular cardiomyocytes as well as on HERG-induced rapidly delayed rectifier K+ current (I(Kr)) in Xenopus laevis oocytes. The e...
Adenylate kinase (AK) is a ubiquitous intracellular enzyme that is released into the extracellular space upon cell lysis. We have shown that AK release serves as a useful reporter of bactericidal agent activity and can be exploited for antimicrobial screening purposes. The AK assay exhibits improved sensitivity over that of growth-based assays and can detect agents that are active against bacte...
Cholangiopathies are characterized by the heterogeneous proliferation of different-sized cholangiocytes. Large cholangiocytes proliferate by a cAMP-dependent mechanism. The function of small cholangiocytes may depend on the activation of inositol trisphosphate (IP(3))/Ca(2+)-dependent signaling pathways; however, data supporting this speculation are lacking. Four histamine receptors exist (HRH1...
CYP3A4, the major form of cytochrome P450 (P450) expressed in the adult human liver, is involved in the metabolism of approximately 50% of commonly prescribed drugs. Several genetic polymorphisms in CYP3A4 are known to affect its catalytic activity and to contribute in part to interindividual differences in the pharmacokinetics and pharmacodynamics of CYP3A4 substrate drugs. In this study, cata...
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