Purification of a colony-stimulating factor from cultured pancreatic carcinoma cells.
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 including isoelectrofocusing and gel filtration chromatography. The purified CSF has a molecular weight of 50,000 and 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.
D001681:Biological Assay; D002460:Cell Line; D003115:Colony-Stimulating Factors / Q000302:isolation & purification* / Q000378:metabolism; D006801:Humans; D008970:Molecular Weight; D010190:Pancreatic Neoplasms / Q000378:metabolism*
D003115:Colony-Stimulating Factors