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Glycosylated or non-glycosylated G-CSF differently influence human granulocyte functions through RhoA
Letizia Mattii1, Antonio Azzarà, Rita Fazzi
1Department of Human Morphology and Applied Biology, University of Pisa, Pisa, Italy.
Abstract:
Granulocyte function may be altered after in vivo G-CSF administration and this has been related to both an immaturity of mobilized cells and to a defect in F-actin polymerization. In this paper we show that in resting Filgrastim (non-glycosylated G-CSF)-pulsed cells, F-actin polymerization, membrane-linked RhoA and cell polarization are enhanced compared to those found in resting Lenograstim (glycosylated G-CSF)-cells. The basal hyper-activation of RhoA could be responsible for the morphological and functional modifications of Filgrastim-mobilized cells. Moreover, Filgrastim-mobilized cells, but not Lenograstim-mobilized cells, are unable to correctly respond to LPS stimulation, as demonstrated by minor further RhoA activation and cell elongation.
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