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Related Experiment Videos

Mucus secretion-stimulating activity in human lymphoblastoid cells.

H Kulemann-Kloene, S S Krag, F B Bang

    Science (New York, N.Y.)
    |August 20, 1982
    PubMed
    Summary

    Two cell fractions from marine invertebrates stimulated mucus secretion. Nuclear fraction activity was trypsin-sensitive and nucleotide-responsive, indicating a potential signaling pathway.

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    Area of Science:

    • Marine biology
    • Cellular signaling
    • Biochemistry

    Background:

    • The marine invertebrate Sipunculus nudus possesses a unique urn cell complex involved in mucus secretion.
    • Understanding the molecular mechanisms regulating mucus secretion in marine invertebrates is crucial for ecological and physiological studies.

    Purpose of the Study:

    • To investigate the molecular components responsible for stimulating mucus secretion in Sipunculus nudus.
    • To characterize the nature of the active fractions and their response to specific stimuli.

    Main Methods:

    • Isolation and fractionation of components from cultured lymphoblastoid cells.
    • Assay of stimulated mucus secretion from the Sipunculus nudus urn cell complex.
    • Enzymatic sensitivity testing (trypsin) and nucleotide stimulation experiments.

    Main Results:

    • Two distinct fractions isolated from cultured cells demonstrated the ability to stimulate mucus secretion.
    • The activity within the nuclear fraction was found to be sensitive to trypsin digestion.
    • This nuclear fraction's activity was enhanced by the presence of specific nucleotides.

    Conclusions:

    • The study identified specific cellular fractions capable of modulating mucus secretion in Sipunculus nudus.
    • The trypsin-sensitive and nucleotide-responsive nature of the nuclear fraction suggests a role for proteases and nucleotide signaling in this process.
    • These findings provide insights into the biochemical pathways regulating mucus secretion in marine invertebrates.

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