Abstract
Aim:
To investigate the effects of panax notoginosides (PNS) on the proliferation of human hematopoietic stem/progenitor cells, and to explore the signaling pathway of the nuclear transcription factor of the glucocorticoid receptor (GR-NTF) initiated by PNS related with the proliferation.
Methods:
The human CD34+ cells and bone marrow nuclear cells were exposed to PNS at a concentration of 0, 10, 25, 50, and 100 mg/L, respectively, in semi-solid culture system to observe colony forming unite of all lineages, granulocyte, erythrocyte, and megakaryocyte (CFU-GEMM, CFU-GM, CFU-E, and CFU-MK). Three lineages of human hematopoietic cell lines, including granulocytic HL-60, erythrocytic K562, megakaryocytic CHRF-288, and Meg-01 cells were incubated with PNS at 20 mg/L for 14 d. Meanwhile, dexamethasone (Dex) was used as a positive control. The nuclear protein of the cells was analyzed by Western blotting with monoclonal antibodies against the amino or carboxyl terminus of GR-NTF. Electrophoretic mobility shift assay performed by using the 32P-radiolabeled GR-NTF consensus oligonucleotide.
Results:
PNS promoted the proliferation of CD34+ cells and significantly raised the colony numbers of CFU-GEMM by 34.7%±16.0% over the non-PNS control (P<0.01). PNS also enhanced the proliferation of CFU-GM, CFU-E, and CFU-MK by 39.3%± 5.7%, 33.3%±7.3%, and 26.2%±3.2%, respectively. GR-NTF protein levels of either the amino or carboxyl terminus in K562, CHRF-288, and Meg-01 treated by PNS increased by 2.4-2.8 fold and 1.3-3.9 fold over the untreated cells. GR-NTF binding activity, initiated by either PNS or Dex, was apparently elevated to form the complex of GR-NTF with DNA as higher density bands in K562 and CHRF-288 cells, and some activity appeared as a band in HL-60 cells induced by PNS.
Conclusion:
PNS displayed the action of hematopoietic growth factor-like or synergistic efficacy to promote proliferation of human progenitor cells, may play a role in the upregulation of gene expression related to proliferation of hematopoietic cells through increasing the GR-NTF synthesis and its DNA binding activity.
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Project supported by a grant from the National Natural Science Foundation of China (No 30070933).
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Gao, Rl., Chen, Xh., Lin, Xj. et al. Effects of notoginosides on proliferation and upregulation of GR nuclear transcription factor in hematopoietic cells. Acta Pharmacol Sin 28, 703–711 (2007). https://doi.org/10.1111/j.1745-7254.2007.00551.x
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DOI: https://doi.org/10.1111/j.1745-7254.2007.00551.x
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