, Volume 20, Issue 6, pp 357–362 | Cite as

Effects of Site-Specific Polyethylene Glycol Modification of Recombinant Human Granulocyte Colony-Stimulating Factor on its Biologic Activities

  • Yong Hao
  • Junhui Chen
  • Xinchang Wang
  • Haowen Zhu
  • Zhigang Rong
Short Communication



Recombinant human granulocyte colony-stimulating factor (rhG-CSF) is a long-chain cytokine that is administered to stimulate the production of white blood cells (WBCs) to reduce the risk of serious infection in immunocompromized patients. However, to achieve sustained stimulation of WBC production, rhG-CSF must be administered frequently, thus limiting its clinical use.


We conjugated rhG-CSF with linear monomethoxy-polyethylene glycol (PEG) maleimide at amino acid residue Cys17 to test our hypothesis that this could extend the in vivo half-life of rhG-CSF in blood.


The mono-PEG rhG-CSF became more stable to pH, temperature, and enzyme degradation in vitro, and had granulopoietic activity that was superior to the unmodified form in vivo. The granulopoietic activity of PEG-G-CSF was 2.82-fold greater than that of unmodified G-CSF.


These results indicate that the thiol-specific PEGylation remarkably prolonged the half-life of rhG-CSF and represents a novel strategy to address the more clinically acceptable therapeutic application of hemopoietic growth factor.


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Copyright information

© Adis Data Information BV 2006

Authors and Affiliations

  • Yong Hao
    • 1
  • Junhui Chen
    • 1
  • Xinchang Wang
    • 1
  • Haowen Zhu
    • 2
  • Zhigang Rong
    • 2
  1. 1.State Key Laboratory of Pharmaceutical Biotechnology, Department of BiochemistryNanjing UniversityNanjingPeople’s Republic of China
  2. 2.Biopharmaceutical Institute of Jiangsu WuzhongSuzhou, JiangsuPeople’s Republic of China

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