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Granulocyte and macrophage colony-stimulating factor from human placenta conditioned medium
Biochemistry
|August 5, 1980
Summary
Human placenta contains two types of colony-stimulating factors (CSFs) that promote marrow cell growth. These distinct CSFs, purified and characterized, differentially stimulate macrophage and granulocytic colony formation.
Area of Science:
- Hematology
- Cell Biology
- Biochemistry
Background:
- Human placenta conditioned medium contains factors stimulating marrow cell colony formation.
- Colony-stimulating factors (CSFs) are crucial for hematopoiesis.
- Understanding CSF heterogeneity is key to their biological roles.
Purpose of the Study:
- To isolate and characterize distinct colony-stimulating factors (CSFs) from human placenta.
- To determine the specific cell types stimulated by each purified CSF.
- To elucidate the biochemical properties of these CSFs.
Main Methods:
- Isoelectrofocusing to separate CSFs based on pI.
- Multiple chromatography and electrophoresis techniques for purification.
- Gel filtration for molecular weight determination.
- Enzymatic and chemical treatments to assess stability and sensitivity.
Main Results:
- Two distinct CSFs were identified and separated.
- CSF type 1 (pI 3.6-4.7, MW 41,000) primarily stimulated mouse macrophage colony formation.
- CSF type 2 (pI 5.7, MW 27,000) predominantly stimulated human granulocytic colony formation.
- Detailed biochemical properties including sensitivity to enzymes and stability were determined for both CSFs.
Conclusions:
- Human placenta produces at least two distinct CSFs with different physicochemical properties.
- These CSFs exhibit differential activity on mouse and human marrow cells, suggesting specific roles in hematopoiesis.
- The characterized CSFs provide valuable insights into the regulation of myeloid cell development.