Effects of rifampin-based antituberculosis therapy on plasma efavirenz concentrations in children vary by CYP2B6 genotype

被引：48

作者：

McIlleron, Helen M. ^{[1
,2
]}

Schomaker, Michael ^{[3
]}

Ren, Yuan ^{[1
]}

Sinxadi, Phumla ^{[1
]}

Nuttall, James J. C. ^{[4
,5
]}

Gous, Hermien ^{[6
]}

Moultrie, Harry ^{[6
]}

Eley, Brian ^{[4
,5
]}

Merry, Concepta ^{[7
,8
]}

Smith, Peter ^{[1
]}

Haas, David W. ^{[9
,10
,11
,12
,13
]}

Maartens, Gary ^{[1
,2
]}

机构：

[1] Univ Cape Town, Dept Med, Div Clin Pharmacol, ZA-7925 Cape Town, South Africa

[2] Univ Cape Town, Inst Infect Dis & Mol Med, ZA-7925 Cape Town, South Africa

[3] Univ Cape Town, Ctr Infect Dis Epidemiol & Res, ZA-7925 Cape Town, South Africa

[4] Univ Cape Town, Sch Child & Adolescent Hlth, ZA-7925 Cape Town, South Africa

[5] Red Cross War Mem Childrens Hosp, Paediat Infect Dis Unit, Cape Town, South Africa

[6] Univ Witwatersrand, Fac Hlth Sci, Wits Reprod Hlth & HIV Inst, Harriet Shezi Childrens Clin, Johannesburg, South Africa

[7] Makerere Univ, Infect Dis Inst, Kampala, Uganda

[8] Univ Dublin Trinity Coll, Sch Med, Dublin 2, Ireland

[9] Vanderbilt Univ, Sch Med, Dept Med, Nashville, TN 37212 USA

[10] Vanderbilt Univ, Sch Med, Dept Pharmacol, Nashville, TN 37212 USA

[11] Vanderbilt Univ, Sch Med, Dept Pathol, Nashville, TN 37212 USA

[12] Vanderbilt Univ, Sch Med, Dept Microbiol, Nashville, TN 37212 USA

[13] Vanderbilt Univ, Sch Med, Dept Immunol, Nashville, TN 37212 USA

来源：

AIDS | 2013年 / 27卷 / 12期

基金：

新加坡国家研究基金会; 美国国家卫生研究院;

关键词：

child; CYP2B6; efavirenz; HIV; isoniazid; rifampin; tuberculosis; HIV-INFECTED CHILDREN; ANTIRETROVIRAL THERAPY; IN-VITRO; TUBERCULOSIS; PHARMACOKINETICS; POLYMORPHISM; NEVIRAPINE; ASSOCIATION; METABOLISM; VARIANTS;

D O I：

10.1097/QAD.0b013e328360dbb4

中图分类号：

R392 [医学免疫学]; Q939.91 [免疫学];

学科分类号：

100102 ;

摘要：

Objectives: An efavirenz-based antiretroviral therapy (ART) regimen is preferred for children more than 3 years of age with tuberculosis. However, rifampin, a key component of antituberculosis therapy, induces CYP2B6. An increased dose of efavirenz is recommended in adults weighing more than 50 kg who require rifampin, but there is scant information in children being treated for tuberculosis. Design: Plasma efavirenz concentrations were compared in 40 children during concomitant treatment for tuberculosis and HIV-1, after stopping rifampicin, and in a control group of children without tuberculosis. Associations with antituberculosis treatment, metabolizer genotype (based on CYP2B6 516G -> T, 983T -> C, and 15582C -> T), weight, and time after dose were evaluated. Results: Compared to children with extensive metabolizer genotypes, efavirenz concentrations were increased 1.42-fold (95% confidence interval, CI 0.94-2.15) and 2.85-fold (95% CI 1.80-4.52) in children with intermediate and slow metabolizer genotypes, respectively. Concomitant antituberculosis treatment increased efavirenz concentrations 1.49-fold (95% CI 1.10-2.01) in children with slow metabolizer genotypes, but did not affect efavirenz concentrations in extensive or intermediate metabolizer genotypes. After adjustment for dose/kg, each kilogram of weight was associated with a 2.8% (95% CI 0.9-4.7) decrease in efavirenz concentrations. Despite higher milligram per kilogram doses, a higher proportion of children in the lowest weight band (10-13.9 kg) had efavirenz concentrations less than 1.0 mg/l than larger children. Conclusion: Antituberculosis treatment was not associated with reduced efavirenz concentrations in children, which does not support increased efavirenz doses. Children with slow metabolizer genotype have increased efavirenz concentrations during antituberculosis treatment, likely due to isoniazid inhibiting enzymes involved in accessory metabolic pathways for efavirenz. (C) 2013 Wolters Kluwer Health vertical bar Lippincott Williams & Wilkins

引用

页码：1933 / 1940

页数：8