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Plasma membrane association of primary biliary cirrhosis mitochondrial marker antigen M2.

Abstract：

:Antibody reactivity against the 'mitochondrial M2 antigen' was determined in sera from 10 patients with primary biliary cirrhosis (PBC), using Western blotting after SDS-PAGE separation of rat liver mitochondria (RLM) and plasma membrane proteins. The molecular weights of the major M2 antigens in rat liver mitochondria were 67 and 50 kD. Two of the 10 PBC patients did not react to any of these major antigens, eight reacted to the 67-kD and four of those also to the 50-kD antigen. The 67- and 50-kD antigens were present in both plasma membrane and RLM and had affinity to concanavalin A. Antibody reactivity against the 67-kD antigen could be detected in both IgG and IgA as well as in the IgM class. The reactive IgG subclasses to both types of antigen preparations were mainly of the G1 and G3 isotypes. This reactivity was always stronger with antigens from the plasma membrane preparations. Sera from two patients with high antibody titres against mitochondria also reacted with IgG2 against the 50-kD antigen from plasma membrane, but not to the corresponding antigen in mitochondria. Reactivity of antibodies in PBC sera to the periphery of viable hepatocytes and radioactive surface labelling of the 50-kD component are both consistent with a plasma membrane localization of M2. Serum from healthy controls and several patients with different diseases did not contain antibodies reactive against any of the antigens described. We suggest that antigens, partly identical to the mitochondrial M2, are located in the plasma membrane compartment. The PBC pathogenetical consequences of these findings are discussed.

journal_name

Clin Exp Immunol

journal_title

Clinical and experimental immunology

authors

Sundin U,Sundqvist KG

doi

10.1111/j.1365-2249.1991.tb05652.x

subject

Has Abstract

pub_date

1991-03-01 00:00:00

pages

407-12

issue

3

eissn

0009-9104

issn

1365-2249

journal_volume

83

pub_type

杂志文章

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