Characterization of autoantibodies to ferritin in canine serum |
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Authors: | Koichi Orino Misaki Higa Mika Fujikawa Kazuhiro Takehara Shozo Okano Shinji Yamamoto Kiyotaka Watanabe |
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Affiliation: | (1) Japan, 176 23 4371;(2) Poultry Disease, School of Veterinary Medicine and Animal Sciences, Kitasato University, Aomori, 034-8628, Japan;(3) Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Aomori, 034-8628, Japan |
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Abstract: | Ferritin-binding proteins circulating in mammalian blood are thought to be involved in the clearance of ferritin. The present study characterizes canine serum autoantibodies (IgM and IgA) that react with ferritin. Canine IgM and IgA bound to bovine spleen ferritin as well as canine liver ferritin. To examine the specificity of canine IgM and IgA to ferritin H and L subunits, we used canine heart ferritin and canine liver ferritin with H/L subunit ratios of 3.69 and 0.43, respectively. Canine IgM and IgA recognized both of the H- and L-subunit-rich isoferritins, showing that their binding activities to ferritin depend on the H-subunit content. Recombinant bovine H-chain ferritin homopolymer expressed in a baculovirus expression system bound more with IgM and IgA than the recombinant L-chain homopolymer expressed under the same conditions. These results suggest that canine IgM and IgA recognize H-subunit-rich isoferritins, and that H-subunit-rich isoferritins are cleared from the circulation more rapidly than L-subunit-rich isoferritins. |
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Keywords: | autoantibody canine ferritin iron ferritin-binding protein serum ferritin |
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