Title : Influence of the G2677T/C3435T haplotype of MDR1 on P-glycoprotein trafficking and ibutilide-induced block of HERG.

Pub. Date : 2009 Jun

PMID : 19204737






3 Functional Relationships(s)
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1 Coculture with fexofenadine(1 microM), an MDR1 substrate known to rescue misfolding in other membrane proteins, restored cell surface expression of MDR1 G2677T/C3435T and restored resistance to block HERG by ibutilide 200 nM (98.5+/-0.98% vs 42.3+/-2.2%, P<0.001). fexofenadine ATP binding cassette subfamily B member 1 Homo sapiens
2 Coculture with fexofenadine(1 microM), an MDR1 substrate known to rescue misfolding in other membrane proteins, restored cell surface expression of MDR1 G2677T/C3435T and restored resistance to block HERG by ibutilide 200 nM (98.5+/-0.98% vs 42.3+/-2.2%, P<0.001). fexofenadine ATP binding cassette subfamily B member 1 Homo sapiens
3 The non-synonymous MDR1 variant G2677 T (A893S) confers resistance to ibutilide block of I(Kr), which is mitigated by the C3435T polymorphism through reduced protein expression, an effect that can be restored by coculture with fexofenadine. fexofenadine ATP binding cassette subfamily B member 1 Homo sapiens