Short Communication The Nonspecific Binding of Tyrosine Kinase Inhibitors to Human Liver Microsomes

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Drugs and other chemicals frequently bind nonspecifically to the constituents of an in vitro incubation mixture, particularly the enzyme source [e.g., human livermicrosomes (HLM)]. Correction for nonspecific binding (NSB) is essential for the accurate calculation of the kinetic parameters Km, Clint, and Ki. Many tyrosine kinase inhibitors (TKIs) are lipophilic organic bases that are nonionized at physiologic pH. Attempts tomeasure theNSBof several TKIs toHLM by equilibrium dialysis proved unsuccessful, presumably due to the limited aqueous solubility of these compounds. Thus, the addition of detergents to equilibrium dialysis samples was investigated as an approach to measure the NSB of TKIs. The binding of six validation set nonionized lipophilic bases (felodipine, isradipine, loratidine, midazolam, nifedipine, and pazopanib) to HLM (0.25 mg/ml) was shown to be unaffected by the addition of CHAPS (6 mM) to the dialysis medium. This approach was subsequently applied to measurement of the binding of axitinib, dabrafenib, erlotinib, gefitinib, ibrutinib, lapatinib, nilotinib, nintedanib, regorafenib, sorafenib, and trametinib to HLM (0.25 mg/ml). As with the validation set drugs, attainment of equilibrium was demonstrated in HLM-HLM and buffer-buffer control dialysis experiments. Values of the fraction unbound to HLM ranged from 0.14 (regorafenib and sorafenib) to 0.93 (nintedanib), and were generally consistent with the known physicochemical determinants of drug NSB. The extensive NSB of many TKIs to HLM underscores the importance of correction for TKI binding to HLMand, presumably, other enzyme sources present in in vitro incubation mixtures.

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SHORT COMMUNICATION The non-specific binding of tyrosine kinase inhibitors to human liver microsomes

240 words Introduction: 421 words Results and Discussion: 1795 words Abbreviations: CMC, critical micelle concentration; HLM, human liver microsomes; HPLC, high performance liquid chromatography; NSB, non-specific binding; RED, rapid equilibrium dialysis; TKI, tyrosine kinase inhibitor This article has not been copyedited and formatted. The final version may differ from this version. DMD Fast F...

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Short Communication The Nonspecific Binding of Tyrosine Kinase Inhibitors to Human Liver Microsomes

Drugs and other chemicals frequently bind nonspecifically to the constituents of an in vitro incubation mixture, particularly the enzyme source [e.g., human livermicrosomes (HLM)]. Correction for nonspecific binding (NSB) is essential for the accurate calculation of the kinetic parameters Km, Clint, and Ki. Many tyrosine kinase inhibitors (TKIs) are lipophilic organic bases that are nonionized ...

متن کامل

Short Communication The Nonspecific Binding of Tyrosine Kinase Inhibitors to Human Liver Microsomes

Drugs and other chemicals frequently bind nonspecifically to the constituents of an in vitro incubation mixture, particularly the enzyme source [e.g., human livermicrosomes (HLM)]. Correction for nonspecific binding (NSB) is essential for the accurate calculation of the kinetic parameters Km, Clint, and Ki. Many tyrosine kinase inhibitors (TKIs) are lipophilic organic bases that are nonionized ...

متن کامل

Short Communication The Nonspecific Binding of Tyrosine Kinase Inhibitors to Human Liver Microsomes

Drugs and other chemicals frequently bind nonspecifically to the constituents of an in vitro incubation mixture, particularly the enzyme source [e.g., human livermicrosomes (HLM)]. Correction for nonspecific binding (NSB) is essential for the accurate calculation of the kinetic parameters Km, Clint, and Ki. Many tyrosine kinase inhibitors (TKIs) are lipophilic organic bases that are nonionized ...

متن کامل

The Nonspecific Binding of Tyrosine Kinase Inhibitors to Human Liver Microsomes.

Drugs and other chemicals frequently bind nonspecifically to the constituents of an in vitro incubation mixture, particularly the enzyme source [e.g., human liver microsomes (HLM)]. Correction for nonspecific binding (NSB) is essential for the accurate calculation of the kinetic parameters Km, Clint, and Ki. Many tyrosine kinase inhibitors (TKIs) are lipophilic organic bases that are nonionized...

متن کامل

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تاریخ انتشار 2015