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Related Experiment Videos

Genetic defect in secretion of complement C5 in mice.

Y M Ooi, H R Colten

    Nature
    |November 8, 1979
    PubMed
    Summary

    Genetic deficiency in mice is caused by a failure to secrete complement component 5 (C5) protein, not a failure in its synthesis. This impacts complement activity and protein levels in deficient strains.

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    Area of Science:

    • Immunology
    • Genetics
    • Molecular Biology

    Background:

    • A significant percentage of mouse strains exhibit a genetic deficiency in the fifth component of complement (C5).
    • Sera from these deficient mice lack detectable C5 activity and protein, and they can produce antibodies against mouse C5.
    • Previous studies suggested potential molecular mechanisms but lacked definitive data.

    Purpose of the Study:

    • To investigate the underlying molecular cause of C5 deficiency in various mouse strains.
    • To determine if the deficiency results from a failure in C5 protein biosynthesis or secretion.

    Main Methods:

    • Utilized cell culture techniques with peritoneal cells from different mouse strains.
    • Employed radiolabeling to track the synthesis and secretion of C5 precursor (pro-C5).
    • Compared C5 protein production and secretion in C5-deficient versus C5-sufficient mouse strains.

    Main Results:

    • C5 deficiency in five different mouse strains (AKR, SWR, DBA/2J, A/HeJ, and B10.D2/old line) is characterized by a failure in C5 protein secretion.
    • Biosynthesis of the C5 precursor, pro-C5, occurs normally in these deficient strains.
    • Radiolabeled pro-C5 was synthesized intracellularly but not secreted into the culture media.

    Conclusions:

    • The primary defect in C5 deficiency across multiple mouse strains is a failure of C5 protein secretion.
    • This secretory defect, rather than a lack of biosynthesis, explains the absence of functional C5 in deficient mice.
    • Understanding this mechanism is crucial for research involving the complement system in mice.

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