Augmentation of c-fos mRNA expression by activators of protein kinase C in fresh, terminally differentiated resting

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Updated: Oct 24, 2026

Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
10:07

Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages

Published on: June 23, 2013

D Radzioch, B Bottazzi, L Varesio

    Molecular and Cellular Biology
    |February 1, 1987
    PubMed

    Insights

    Fresh macrophages (M phi) showed increased c-fos mRNA levels upon stimulation with protein kinase C activators like PMA. This c-fos mRNA induction is stimulus-specific, not function-specific, in these differentiated cells.

    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Immunology

    Background:

    • Terminally differentiated macrophages (M phi) are nonproliferating cells.
    • Understanding gene regulation in differentiated cells is crucial for cellular function.
    • The role of c-fos mRNA in macrophages requires further investigation.

    Purpose of the Study:

    • To investigate the expression of c-fos mRNA in fresh, normal peritoneal macrophages.
    • To determine the stimuli that can augment c-fos mRNA levels in M phi.
    • To elucidate the signaling pathways controlling c-fos mRNA induction in M phi.

    Main Methods:

    • Primary culture of fresh, normal peritoneal macrophages (M phi).
    • Stimulation of M phi with phorbol myristate acetate (PMA), calcium ionophore, and 1-oleoyl-2-acetoyl glycerol (OAG).
    • Quantification of c-fos mRNA levels using techniques not specified in the abstract, but implied by "levels" and "induction kinetics."

    Main Results:

    • PMA, calcium ionophore, and OAG dramatically increased c-fos mRNA levels in M phi.
    • c-fos mRNA induction peaked at 30 minutes post-stimulation, showing similar kinetics for all agents.
    • Interferons beta and gamma did not alter c-fos mRNA levels, despite activating M phi functions.
    • The stimuli that increased c-fos mRNA are activators of protein kinase C, suggesting its role in regulation.

    Conclusions:

    • c-fos mRNA can be augmented in fresh, terminally differentiated macrophages.
    • Protein kinase C activation appears to control c-fos mRNA levels in M phi.
    • c-fos mRNA augmentation is a stimulus-specific response, not directly linked to M phi functions like respiratory burst or tumoricidal activity.

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