GcMAF isoelectric focusing pattern and tumoricidal activity

BACKGROUND: Gc protein is the precursor for Gc protein-derived macrophage activating factor (GcMAF), with three phenotypes: Gc1f, Gc1s and Gc2, based on its electrophoretic mobility. The difference in electrophoretic mobility is because of the difference in its posttranslational sugar moiety composition.

MATERIALS AND METHODS: We compared the difference between Gc protein and GcMAF electrophoretic mobility using the isoelectric focusing (IEF) method. The tumoricidal activity of GcMAF-treated macrophage was evaluated after coculture with L-929 cell. The tumoricidal mechanism was investigated using TNF bioassay and nitric oxide (NO) release.

RESULTS: The difference in Gc protein and GcMAF electrophoretic mobility was detected. The tumoricidal activity of GcMAF-treated macrophage was detected, but no release of TNF and NO was detected.

CONCLUSION: The difference of isoelectric focusing mobility in Gc protein and GcMAF would be useful to develop a GcMAF detection method. GcMAF increased macrophage tumoricidal activity but TNF and NO release were not involved in the mechanism.

Anticancer Res. 2003 Nov-Dec;23(6a):4451-7..

Mohamad SB Nagasawa H Sasaki H Uto Y Nakagawa Y Kawashima K Hori H

Department of Biological Science and Technology, Faculty of Engineering, University of Tokushima, Minamijyosajimacho-2, Tokushima, 770-8506 Japan.

Source: http://www.ncbi.nlm.nih.gov/pubmed/14666733