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Molecular cloning of a complementary DNA encoding human macrophage-specific colony-stimulating factor (CSF-1)
Science (New York, N.Y.)
|October 18, 1985
Summary
Researchers isolated complementary DNA (cDNA) clones for human macrophage colony-stimulating factor (CSF-1). They confirmed biologically active CSF-1 synthesis in COS cells using specific assays, demonstrating successful gene expression.
Area of Science:
- Molecular Biology
- Immunology
- Cell Biology
Background:
- Colony-stimulating factor 1 (CSF-1) is crucial for macrophage development and function.
- Understanding CSF-1's genetic basis is key to studying macrophage biology.
Purpose of the Study:
- To isolate and characterize complementary DNA (cDNA) clones encoding human macrophage-specific CSF-1.
- To confirm the biological activity of the synthesized CSF-1 protein.
Main Methods:
- Isolation and cloning of human CSF-1 cDNA into the Okayama-Berg expression vector.
- Expression of CSF-1 in COS cells.
- Assessment of CSF-1 biological activity using radioreceptor assay, macrophage colony formation assay, and antibody neutralization.
Main Results:
- A functional cDNA clone was identified, coding for a mature 224-amino acid CSF-1 polypeptide with a 32-amino acid leader sequence.
- Biologically active CSF-1 was synthesized and secreted by COS cells transfected with the functional cDNA clone.
- Most other cDNA isolates contained intronic sequences, leading to premature translation termination and inactive CSF-1.
Conclusions:
- The study successfully isolated a cDNA clone encoding biologically active human macrophage CSF-1.
- Expression of CSF-1 involves multiple messenger RNA species, despite being encoded by a single-copy gene.
- This work provides a foundation for further investigation into CSF-1's role in macrophage biology and potential therapeutic applications.