rhG-CSF对单核细胞鞘氨醇激酶活性影响的初步研究

本研究旨在了解rhG—CSF对单核细胞鞘氨醇激酶（SphK）活性的影响。应用黏附法分离献血员和rhG—CSF动员第5天供者的外周血单核细胞并使用流式细胞术测定单核细胞富集效率，应用RT—PCR检测两种来源单核细胞G—CSF受体和SphK的表达情况，并应用γ^32 P—ATP掺入法测定rhG-CSF处理的单核细胞胞浆SphK活性变化。研究结果表明，献血员和rhG—CSF动员后供者的单核细胞均表达G-CSF受体和SphK；rhG—CSF处理献血员单核细胞对细胞SphK活性无明显影响；rhG—CSF处理供者动员后单核细胞使sphK活性增加（39.6—87．2）％（P〈0.05），且呈与剂量无明显关系的瞬时效应。结论：rhG—CSF能增加rhG-CSF动员后单核细胞的SphK活性。

Influence of rhG-CSF on Activity of Sphingosine Kinase in Monocytes

The aim of this research was to understand the influence of rhG-CSF on the sphingosine kinase (SphK) activity of monocytes. The peripheral blood monocytes were collected from 6 peripheral blood progenitor cell donors on the fifth day of mobilization with rhG-CSF and from 5 blood donors' buffy coats. The mRNA expressions of monocyte G-CSF receptor and SphK were tested with RT-PCR. The changes of SphK activity of monocytes were assayed after being treated with rhG-CSF. The results showed that the two kinds monocytes collected from both blood donors and peripheral blood progenitor cell donors mobilized with rhG-CSF expressed mRNA of G-CSF receptor and SphK. The SphK activity of monocytes collected from blood donors was not changed significantly after being treated with rhG-CSF (P > 0.05). The SphK activity of monocytes collected from peripheral blood progenitor cell donors transiently increased by (39.6 - 87.2)% after being treated by means of rhG-CSF (P < 0.05) without obviously dose-dependent effect. It is concluded that the SphK activity of monocytes collected from peripheral blood progenitor cell donors can be activated by rhG-CSF.