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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cytochrome P450 2A6: a new hepatic autoantigen in patients with chronic hepatitis C virus infection.

BACKGROUND/AIMS: Cytochromes P4502A6 (CYP2A6) and P4501A2 (CYP1A2) were described as hepatic autoantigens in the autoimmune polyglandular syndrome type-1 (APS-1). We evaluated the significance of anti-CYP2A6 and anti-CYP1A2 in several hepatic diseases in the absence of APS-1. METHODS: A radioligand assay (RLA) based on immunoprecipitation of [(35)S]-methionine-labeled CYP2A6 and CYP1A2 was used. Four hundred and thirty subjects with chronic viral hepatitis (n=185), autoimmune liver diseases (n=181), autoimmune rheumatic diseases ( ARD, n=31) and healthy (n=33) were tested. RESULTS: Seven out of 366 patients with liver diseases were anti-CYP2A6 positive. Neither healthy nor ARD patients showed anti-CYP2A6. One out of 181 patients with autoimmune liver diseases tested anti-CYP2A6 positive. A significantly higher prevalence of anti-CYP2A6 (P<0.05) was detected with six out of seven patients positive in the viral hepatitis group. The latter were infected by flaviviruses (1 HGV/GBVC, 5 HCV). 4/5 HCV/anti-CYP2A6 positive sera were positive for anti-LKM-1 by immunofluorescence and for anti-CYP2D6 by RLA. None of the 430 sera recognized CYP1A2. CONCLUSIONS: For the first time CYP2A6 is reported as a hepatic autoantigen in patients with viral hepatitis caused by flaviviruses and in particular in HCV/anti-LKM-1 positive patients. Multicenter studies are needed in order to investigate the clinical importance of this novel finding. This study further supports that anti-CYP2A6 in the absence of flavivirus is rather limited to APS-1.[1]


  1. Cytochrome P450 2A6: a new hepatic autoantigen in patients with chronic hepatitis C virus infection. Dalekos, G.N., Obermayer-Straub, P., Bartels, M., Maeda, T., Kayser, A., Braun, S., Loges, S., Schmidt, E., Gershwin, M.E., Manns, M.P. J. Hepatol. (2003) [Pubmed]
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