Related Experiment Video
Updated: Aug 8, 2026
Culture of Macrophage Colony-stimulating Factor Differentiated Human Monocyte-derived Macrophages
Published on: June 30, 2016
Stimulation of macrophage colony-stimulating factor synthesis by interleukin-1
1Department of Biochemistry and Molecular Biology, Texas College of Osteopathic Medicine/University of North Texas, Fort Worth 76107.
Insights
Interleukin-1 (IL-1) induces colony-stimulating factor-1 (CSF-1) in MIA PaCa-2 cells. This process involves pertussis toxin-sensitive pathways and c-fos/c-jun oncogene expression, but not protein kinase C.
Area of Science:
- Cellular and Molecular Biology
- Immunology
- Oncology
Background:
- Interleukin-1 (IL-1) is a key mediator of inflammatory responses.
- Colony-stimulating factor-1 (CSF-1) plays a crucial role in cell proliferation and differentiation.
- Understanding the regulation of CSF-1 production is vital for inflammatory and cancer research.
Purpose of the Study:
- To elucidate the signaling pathways involved in IL-1-induced CSF-1 production in MIA PaCa-2 cells.
- To investigate the role of pertussis toxin-sensitive pathways, cAMP, and protein kinase C (PKC) in this process.
- To explore the involvement of proto-oncogenes c-fos and c-jun in regulating CSF-1 gene expression.
Main Methods:
- Treatment of MIA PaCa-2 cells with IL-1 and various inhibitors (pertussis toxin, benzamide, cholera toxin, H7).
- Measurement of CSF-1 production.
- Assessment of intracellular cAMP levels.
- Analysis of c-fos and c-jun gene expression.
Main Results:
- IL-1 significantly induced CSF-1 production in MIA PaCa-2 cells.
- Pertussis toxin markedly suppressed IL-1-induced CSF-1 production, an effect reversed by benzamide.
- Cholera toxin also inhibited IL-1-induced CSF-1 production, reversed by an arginine analog.
- Elevating cAMP levels suppressed IL-1-induced CSF-1 production, suggesting an inverse relationship.
- IL-1-induced CSF-1 production was not mediated by PKC activation.
- Expression of c-fos and c-jun was enhanced prior to CSF-1 production.
Conclusions:
- IL-1-induced CSF-1 production in MIA PaCa-2 cells is regulated by pertussis toxin-sensitive signaling pathways.
- cAMP levels appear to inversely regulate CSF-1 biosynthesis.
- PKC activation is not involved in IL-1-induced CSF-1 production.
- The expression of proto-oncogenes c-fos and c-jun may be critical for triggering CSF-1 gene expression.
Abstract:
Interleukin-1 (IL-1), which plays an important role in the inflammatory response, was found to induce colony-stimulating factor-1 (CSF-1) expression in the MIA PaCa-2 cells. IL-1-induced CSF-1 production was markedly suppressed (70%) by pertussis toxin. This inhibition by pertussis toxin was reversed by benzamide, an inhibitor of ADP-ribosylation reactions. Similarly, IL-1-induced CSF-1 production was inhibited by cholera toxin and this inhibition was reversed by an arginine analog, p-methoxy-benzylaminodecamethylene guanidine sulfate. Dibutyryl-cAMP as well as other cAMP elevating agents such as theophylline and forskolin also suppressed IL-1-induced CSF-1 production, suggesting that cAMP concentrations inversely regulate the biosynthesis of CSF-1. Measurement of cAMP concentration indicated that IL-1 treatment of MIA PaCa-2 cells did not change the cAMP level. IL-1-induced CSF-1 production was not suppressed by the protein kinase C (PKC) inhibitor, H7, under conditions in which 12-O-tetradecanoylphorbol-13-acetate-induced CSF-1 production was completely abolished. These data suggest that IL-1-induced CSF-1 production is not mediated via the activation of PKC. Analysis of oncogene c-fos and c-jun expression has shown the enhancement of expression of both protooncogenes prior to CSF-1, suggesting that the expression of these two oncogenes may be the mechanism which triggers CSF-1 gene expression.
More Related Videos
Related Concept Videos
01:15Differentiation of Common Myeloid Progenitor Cells
01:01Regulation of Hematopoietic Stem Cells