Genetic determinants of cocaine-associated agranulocytosis View Full Text


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Article Info

DATE

2015-12

AUTHORS

Jane A Buxton, John Omura, Margot Kuo, Colin Ross, Despina Tzemis, Roy Purssell, Jennifer Gardy, Bruce Carleton

ABSTRACT

BACKGROUND: Drug-induced agranulocytosis is a recognized adverse drug event associated with serious infectious complications. Levamisole is an antihelminthic and immunomodulator withdrawn from North American markets in 2005 after reports of agranulocytosis. Previous studies of levamisole, suggest that the human leukocyte antigen (HLA)-B27 confers a genetic predisposition to this adverse drug event. Since 2009, emergency room visits due to agranulocytosis in individuals consuming levamisole-adulterated crack-cocaine have increased. METHODS: We performed a case-control study using a genotyping assay and novel gene chip to test the association between cocaine-associated agranulocytosis (CAA) and HLA-B27 and to identify pharmacokinetic and pharmacodynamic gene variants associated with the phenotype. RESULTS: Fifty-one CAA cases were identified through a provincial physician reporting system between 2008 and 2011. We examined eight of these cases and 26 matched controls. Genotyping revealed a significant association between HLA-B27 and CAA (odds ratio [OR] 9.2, 95% confidence interval [CI], 1.54-54.6). We also observed a similar association with the HLA-B27 tag single nucleotide polymorphism rs4349859 (OR 9.2, 95% CI 1.5-54.6) and rs13202464 (OR 6.7, 95% CI 1.1-41). Further associations were identified with variants in the ARBCC12 (OR 10.0, 95% CI 2.7-36.8) and CYP11A1 (OR 7.4, 95% CI 2.1-26.6) genes, while a novel protective association was observed with variants in the ARDB1 gene (OR 0.06, 95% CI 0.007-0.46). CONCLUSIONS: We confirmed the association of HLA-B27 with CAA and identified additional susceptibility variants. Health care providers should inform people who are identified as having CAA that it is genetically determined and can recur with continued cocaine use. The severity of infections and subsequent hospitalization, and the risk of recurrence may prompt health-promoting behaviour changes of the affected individuals. These genetic associations warrant the attention of public health and knowledge translation efforts to highlight the implications for susceptibility to this severe adverse drug event. More... »

PAGES

240

References to SciGraph publications

  • 2009-12. Levamisole tainted cocaine causing severe neutropenia in Alberta and British Columbia in HARM REDUCTION JOURNAL
  • 1978-12. HLA-B27, antinuclear antibodies and drug-induced agranulocytosis in JOURNAL OF MOLECULAR MEDICINE
  • 2010-09. Levamisole: A Dangerous New Cocaine Adulterant in CLINICAL PHARMACOLOGY & THERAPEUTICS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1186/s13104-015-1219-4

    DOI

    http://dx.doi.org/10.1186/s13104-015-1219-4

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1041651630

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/26070312


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    50 schema:description BACKGROUND: Drug-induced agranulocytosis is a recognized adverse drug event associated with serious infectious complications. Levamisole is an antihelminthic and immunomodulator withdrawn from North American markets in 2005 after reports of agranulocytosis. Previous studies of levamisole, suggest that the human leukocyte antigen (HLA)-B27 confers a genetic predisposition to this adverse drug event. Since 2009, emergency room visits due to agranulocytosis in individuals consuming levamisole-adulterated crack-cocaine have increased. METHODS: We performed a case-control study using a genotyping assay and novel gene chip to test the association between cocaine-associated agranulocytosis (CAA) and HLA-B27 and to identify pharmacokinetic and pharmacodynamic gene variants associated with the phenotype. RESULTS: Fifty-one CAA cases were identified through a provincial physician reporting system between 2008 and 2011. We examined eight of these cases and 26 matched controls. Genotyping revealed a significant association between HLA-B27 and CAA (odds ratio [OR] 9.2, 95% confidence interval [CI], 1.54-54.6). We also observed a similar association with the HLA-B27 tag single nucleotide polymorphism rs4349859 (OR 9.2, 95% CI 1.5-54.6) and rs13202464 (OR 6.7, 95% CI 1.1-41). Further associations were identified with variants in the ARBCC12 (OR 10.0, 95% CI 2.7-36.8) and CYP11A1 (OR 7.4, 95% CI 2.1-26.6) genes, while a novel protective association was observed with variants in the ARDB1 gene (OR 0.06, 95% CI 0.007-0.46). CONCLUSIONS: We confirmed the association of HLA-B27 with CAA and identified additional susceptibility variants. Health care providers should inform people who are identified as having CAA that it is genetically determined and can recur with continued cocaine use. The severity of infections and subsequent hospitalization, and the risk of recurrence may prompt health-promoting behaviour changes of the affected individuals. These genetic associations warrant the attention of public health and knowledge translation efforts to highlight the implications for susceptibility to this severe adverse drug event.
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