IL-3 and GM-CSF in combination alters protein tyrosine kinase activity of splenic macrophages in leukemic mice.

Abstract

Objectives: Murine macrophages were playing a key role against microbes and foreign particles as well as help in solid tumorigenesis in the host body. In this experiment we were trying to evaluate the protein tyrosine kinase (PTK) activity in macrophages from experimentally induced leukemic animal model. Methods: Balb/C mice were divided into four groups, two groups were challenged with N-N' ethyl nitrosourea (ENU) and two groups remained without ENU challenged condition. After confirmation of leukemia induction, one normal and one ENU challenged groups were received rmIL-3 and rmGM-CSF in combination for 4 consecutive days. Disease was confirmed by histological studies of peripheral blood and bone marrow smear. PTK activity assay were done using universal tyrosine kinase assay kit. Results: Protein tyrosine kinase (PTK) activity of macrophages was increased in leukemic animal significantly which were reduced after combination of IL-3 and GM-CSF treatment. IFN-γ level in blood serum was increased in leukemic mice and reinstates after treatment. Conclusion: Results suggest that, in leukemia reduced macrophage number can be increased by IL-3 and GM-CSF administration in combination but PTK activity is not involved to increase the number of macrophages. PTK activity may be involved in macrophage activation process in leukemic animal.