Serum-free conditioned medium prepared from an established line of human pancreatic carcinoma (MIA PaCa-2) provides a rich source of colony-stimulating factor (CSF). Two activities distinctly separable by isoelectrofocusing have been identified: a high molecular weight CSF exhibiting greater activity in mouse bone marrow and a low molecular weight CSF more active in human bone marrow. The high molecular weight CSF has been purified 1000-fold to apparent homogeneity by a two-step procedure incuding isoelectrofocusing and gel filtration chromatography. The purified CSF has a molecular weight of 50,000 an an isoelectric point of 3.7 to 4.6. It is a glycoprotein as shown by periodic acid-Schiff stain and exhibits greater activity in mouse marrow than in human marrow.
|Original language||English (US)|
|Number of pages||3|
|Journal||Journal of Biological Chemistry|
|State||Published - Dec 1 1979|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology