Title : Midazolam exhibits characteristics of a highly permeable P-glycoprotein substrate.

Pub. Date : 2003 May

PMID : 12751631






9 Functional Relationships(s)
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1 Midazolam exhibits characteristics of a highly permeable P-glycoprotein substrate. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
2 PURPOSE: The purpose of this study was to investigate whether midazolam exhibits characteristics of a highly permeable P-glycoprotein (P-gp) substrate and to evaluate the potential influence of P-gp inhibition on 1-OH midazolam formation during midazolam transport. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
3 PURPOSE: The purpose of this study was to investigate whether midazolam exhibits characteristics of a highly permeable P-glycoprotein (P-gp) substrate and to evaluate the potential influence of P-gp inhibition on 1-OH midazolam formation during midazolam transport. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
4 METHODS: P-gp interaction was investigated by P-gp ATPase assay, efflux inhibition studies, and transport studies of midazolam across MDR1-MDCK and 1-alpha,25-dihydroxy vitamin D3-induced Caco-2 monolayers with and without the P-gp inhibitor GF120918. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
5 METHODS: P-gp interaction was investigated by P-gp ATPase assay, efflux inhibition studies, and transport studies of midazolam across MDR1-MDCK and 1-alpha,25-dihydroxy vitamin D3-induced Caco-2 monolayers with and without the P-gp inhibitor GF120918. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
6 P-gp ATPase activation by midazolam was dose-dependent and saturable [Km = 11.5(+/- 4.0) microM; Vmax = 41.1(+/- 7.4) nmol/mg/min]. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
7 P-gp inhibition increased 1-OH midazolam formation in A-to-B studies 1.3-fold when midazolam donor > or = 10 microM (p < 0.03). Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
8 CONCLUSION: The results indicate that midazolam exhibited characteristics of a highly permeable P-gp substrate. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens
9 1-OH midazolam formation during A-to-B midazolam transport increased slightly when P-gp was inhibited. Midazolam ATP binding cassette subfamily B member 1 Homo sapiens