线性范围:15.6 - 1000 pg/ml.Mouse granulocyte-colony stimulating factor (G-CSF) is a 24-25 kDa monomeric glycoprotein that regulates the proliferation, differentiation and activation of hematopoietic cells. Mouse G-CSF cDNA encodes a 208 amino acid (aa) precursor protein with a 30 aa signal sequence that is proteolytically cleaved to form a 178 aa O-glycosylated mature protein containing two intrachain disulfide bridges. In humans, two distinct cDNA clones, encoding a 204 aa form and a minor alternatively spliced 207 aa form of G-CSF precursors, have been isolated. Mouse and human G-CSF are 76% identical at the aa sequence level and the two proteins show species cross-reactivity. G-CSF is produced primarily by monocytes and macrophages upon activation by endotoxin, TNF-α or IL-1. Other cell types, including fibroblasts, endothelial cells, astrocytes and bone marrow stroma cells, can also secrete G-CSF after activation. In addition, various tumor cells express G-CSF constitutively. G-CSF is an important regulator for granulopoiesis in vivo. It has been demonstrated that G-CSF can support the growth of multi-lineage hematopoietic progenitor cells without influencing their commitment to the myeloid lineage and mobilize hematopoietic progenitor cells from the bone marrow into the bloodstream. On mature neutrophils, G-CSF may regulate neutrophil survival by controlling their rate of apoptosis. G-CSF has also been shown to enhance the functional capacity of mature neutrophils. As a consequence of its effects on hematopoietic progenitor cells, G-CSF has been shown to enhance monocytopoiesis in the presence M-CSF. Within the peripheral blood stem cell population mobilized with G-CSF, selective increases in the number of T helper 2-inducing dendritic cells are found.