Abstract:
:Numerous human Cytochrome P450 enzymes (CYPs) associated with 'phase I' drug metabolism have been identified. Among them, CYP2D6 is thought to be the major target autoantigen to anti-liver kidney microsome (LKM)-1 autoantibody, a characteristic feature of autoimmune hepatitis (AIH) type II. In this study, we were able to clone CYP2D6 cDNA from a human liver cDNA library and express the CYP2D6 recombinant protein, and also to prepare four other representative human CYP proteins (CYP1A2, 2C9, 2E1, and 3A4). These preparations were used to assay the immunoreactivity of patients with AIH type I (n=35) and type II (n=9). As comparison groups, sera from patients with chronic hepatitis B (n=15), chronic hepatitis C (n=55; 24 anti-LKM-1-positive, 31 anti-LKM-1-negative), and from normal controls (n=30) were included. The five CYP proteins did not react with sera from normal controls nor from patients with chronic hepatitis B. CYP2D6 reacted with sera from 100% (9/9) of AIH type II patients, 79% (19/24) of patients with anti-LKM-1-positive chronic hepatitis C, and 6.5% (2/31) of patients with anti-LKM-1-negative chronic hepatitis C. In contrast, CYP1A2 reacted with serum from one patient with AIH type I, CYP2E1 reacted with sera from two patients with AIH type I, one patient with anti-LKM-1-positive chronic hepatitis C, and two patients with anti-LKM-1-negative chronic hepatitis C, and CYP3A4 reacted with sera from one patient with AIH type II and one patient with anti-LKM-1-positive chronic hepatitis C. CYP2C9 did not react with any of the sera included in this study. From these results, it is suggested that CYPs other than CYP2D6 can function as immunotargets in certain disease conditions.
journal_name
Autoimmunityjournal_title
Autoimmunityauthors
Miyakawa H,Kitazawa E,Kikuchi K,Fujikawa H,Kawaguchi N,Abe K,Matsushita M,Matsushima H,Igarashi T,Hankins RW,Kako Mdoi
10.3109/08916930108994106subject
Has Abstractpub_date
2000-01-01 00:00:00pages
23-32issue
1eissn
0891-6934issn
1607-842Xjournal_volume
33pub_type
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