Abstract
Monoclonal antibodies (mAbs) have been prepared against type IV collagen isolated from human kidney. Two mAbs, designated CIV 22 and CIV 16, were extensively characterized. CIV 22 reacted only with native type IV collagen, whereas CIV 16 also bound to fragments derived from the alpha 1(IV) chain after reduction and alkylation of the molecule. Therefore, CIV 22 recognizes a conformational epitope on the triple helical type IV collagen, whereas CIV 16 binds to a sequential determinant in the carboxyl-terminal half of the alpha 1(IV) chain. By immunofluorescence, typical basement membrane structures were stained with both mAbs on frozen sections of different human organs. The mAbs were used to investigate the chain composition of type IV collagen. Radiolabeled type IV collagen bound to CIV 22, proving its triple helical configuration. These native probes, containing both the alpha 1(IV) and the alpha 2(IV) chains, also bound to CIV 16. Since CIV 16 does not react with the isolated alpha 2(IV) chain, both chains must be arranged in a single triple helical molecule (heterotrimer).
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