ABSTRACT
Purpose
This study investigated whether haplotypes in the multidrug resistance 1 (MDR1) gene had effects on mRNA expression levels of MDR1 and cytochrome P450 (CYP) 3A4, and on the pharmacokinetics of tacrolimus in living-donor liver transplant (LDLT) patients, considering the gender difference.
Methods
Haplotype analysis of MDR1 with G2677T/A and C3435T was performed in 63 de novo Japanese LDLT patients (17 to 55 years; 44.4% women). The expression levels of MDR1 and CYP3A4 mRNAs in jejunal biopsy specimens were quantified by real-time PCR.
Results
Intestinal CYP3A4 mRNA expression levels (amol/µg total RNA) showed significantly higher values in women carrying the 2677TT-3435TT haplotype (median, 10.7; range, 5.92–15.2) than those with 2677GG-3435CC (3.03; range 1.38–4.68) and 2677GT-3435CT (median, 4.31; range, 0.07–9.42) (P = 0.022), but not in men (P = 0.81). However, MDR1 haplotype did not influence mRNA expression levels of MDR1 nor the concentration/dose ratio [(ng/mL)/(mg/day)] of oral tacrolimus for the postoperative 7 days, irrespective of gender.
Conclusion
MDR1 haplotype may have a minor association with the tacrolimus pharmacokinetics after LDLT, but could be a good predictor of the inter-individual variation of intestinal expression of CYP3A4 in women.
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Abbreviations
- C/D:
-
Concentration/dose
- CYP:
-
Cytochrome P450
- LDLT:
-
Living-donor liver transplantation
- MDR:
-
Multidrug resistance
- Pgp:
-
P-glycoprotein
- SNP:
-
Single nucleotide polymorphism
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ACKNOWLEDGEMENTS
This work was supported in part by the 21st Century Center of Excellence (COE) Program “Knowledge Information Infrastructure for Genome Science”, and by a grant-in-aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan. K. Hosohata was supported as a Research Assistant by the 21st Century COE program “Knowledge Information Infrastructure for Genome Science”.
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Hosohata, K., Masuda, S., Yonezawa, A. et al. MDR1 Haplotypes Conferring an Increased Expression of Intestinal CYP3A4 Rather than MDR1 in Female Living-Donor Liver Transplant Patients. Pharm Res 26, 1590–1595 (2009). https://doi.org/10.1007/s11095-009-9867-5
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DOI: https://doi.org/10.1007/s11095-009-9867-5