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  • Title: Atrial natriuretic factor (ANF) prohormone accumulates in the IgG fraction of anti-ANF hybridoma-bearing mice.
    Author: Milne RW, Gutkowska J.
    Journal: Biochem Biophys Res Commun; 1996 Jan 26; 218(3):665-9. PubMed ID: 8579571.
    Abstract:
    We demonstrate immunoreactive mouse atrial natriuretic factor (ANF) in the IgG fraction prepared from ascites or serum of mice bearing an anti-rat ANFArg101-Tyr126 hybridoma. The HPLC profile of the ANF demonstrates that the IgG fraction contains both mature ANFSer99-Tyr126 and the prohormone ANFAsn1-Tyr126. The presence of circulating prohormone in the hybridoma-bearing mice is not secondary to changes in fluid volume due to ascites formation. The anti-ANF antibody appears to protect the ANFAsnl-Tyr126 from both maturation and rapid receptor-mediated clearance. Our results suggest, therefore, that the ANFAsn1-Tyr126 can be secreted into a compartment that is accessible to antibody and that maturation of the ANF prohormone may be an extracellular event.
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