[Effect of G-CSF in vitro Stimulation on Distribution of Peripheral Lymphocyte Subsets in the Healthy Persons]

To investigate the effect of granulocyte-colony stimulating factor (G-CSF) in vitro stimulation on the distribution of lymphocyte subset in healthy human.

Peripheral blood mononuclear cells (PBMNCs) were collected from 8 healthy volunteers by density gradient centrifugation on Ficoll-Paque^TM. In vitro 200 ng/ml G-CSF or 200 ng/ml G-CSF plus 10 µg/ml ConA directly act on PBMNCs, then the colleted cells were cultivated for 3 days. Lymphocyte subsets were stained with the corresponding fluoresce labeled antibodies and detected by flow cytometry.

The levels of T cells in G-CSF group and G-CSF+ConA group were both higher than that in the control group (P<0.001, P<0.05). However, there were not significantly different in B cells and NK cells levels among the 3 groups. Furthermore, analysis of the effect of G-CSF on T cell subsets indicated that the levels of CD4⁺T cells and CD8⁺T cells in G-CSF group were both significantly higher than those in control group (P<0.01, P<0.05), Treg cells was not different between G-CSF and control group. Compared with the control group, the level of CD4⁺T cells, CD8⁺T cells and Treg cells in G-CSF+ConA group significantly increased (P<0.05, P<0.01, P<0.01). Analysis of G-CSF receptor (G-CSFR) expression showed that G-CSFR expression on T cells in G-CSF+ConA group dramatically increased, as compared with control group (P<0.01).

The levels of CD4⁺T cells and CD8⁺T cells in healthy human peripheral blood can be increased by G-CSF stimulation. ConA can enhance the level of T cells and induce G-CSFR expression on T cells.