Related Experiment Video

Updated: Aug 18, 2026

Application of Long-term cultured Interferon-γ Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle
15:57

Application of Long-term cultured Interferon-γ Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle

Published on: July 11, 2015

Interferon production by Corynebacterium parvum and BCG-activated murine spleen macrophages

C Neumann, E Macher, C Sorg

    Immunobiology
    |April 1, 1980
    PubMed

    Insights

    Certain immunomodulators like Corynebacterium parvum activate splenic macrophages, a key source of interferon. This interferon production is largely T-cell independent and may regulate immune responses.

    Area of Science:

    • Immunology
    • Virology
    • Cell Biology

    Background:

    • Macrophages are crucial immune cells involved in host defense.
    • Interferons are critical signaling proteins in the innate immune system.
    • Immunomodulators are agents that modify immune responses.

    Purpose of the Study:

    • To investigate the role of macrophages as a source of interferon following immunomodulator administration.
    • To explore the mechanism of interferon induction and its properties.
    • To determine the T-cell dependency of this immune response.

    Main Methods:

    • Murine spleen cell cultures were used to assess interferon production.
    • Intravenous injection of Corynebacterium parvum (C. parvum) strains and Bacille Calmette Guérin (BCG) were employed.
    • Protein synthesis inhibition and antiviral assays were performed.
    • Characterization of interferon activity included pH stability and neutralization studies.

    Main Results:

    • Macrophages were identified as a major source of interferon after C. parvum (strain CN 6134) or BCG injection.
    • A biologically inactive C. parvum strain (CN 5888) did not induce significant interferon.
    • Protein synthesis was essential for both interferon production and the expression of the antiviral state.
    • The induced interferon exhibited properties consistent with type I interferon.
    • Interferon production was similar in athymic nu/nu mice, suggesting a T-cell independent mechanism.

    Conclusions:

    • Certain immunomodulators activate splenic macrophages to produce interferon through a T-cell independent pathway.
    • Interferon may function as a local mediator in immunoregulation.
    • The findings highlight the interplay between immunomodulators, macrophages, and interferon in innate immunity.

    More Related Videos

    Experimental Infection with Listeria monocytogenes as a Model for Studying Host Interferon-γ Responses10:10

    Experimental Infection with Listeria monocytogenes as a Model for Studying Host Interferon-γ Responses

    Published on: November 16, 2016

    Imaging of In Situ Interferon Gamma Production in the Mouse Spleen following Listeria monocytogenes Infection09:11

    Imaging of In Situ Interferon Gamma Production in the Mouse Spleen following Listeria monocytogenes Infection

    Published on: July 16, 2019

    Related Concept Videos

    Differentiation of Common Myeloid Progenitor Cells01:15

    Differentiation of Common Myeloid Progenitor Cells

    Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
    Defense Against Bacterial Pathogens01:31

    Defense Against Bacterial Pathogens

    The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
    Phagocytes
    Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
    Immune Response Against Viral Pathogens01:29

    Immune Response Against Viral Pathogens

    The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
    NK Cells
    NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...