Astragalus polysaccharide RAP induces macrophage phenotype polarization to M1 via the notch signaling pathway

Wei Wei, Zhipeng Li, Zhaoxiang Bian, Simon Q B Han*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

54 Citations (Scopus)


Macrophages occur in polarized phenotypes, whose characteristics determine the role they play in tumor growth. The M1 phenotype macrophages promote tumoricidal responses and suppress tumor growth. Our previous study showed that a polysaccharide isolated from Radix Astragali, named RAP, was itself non-cytotoxic but induced RAW264.7 cells' cytotoxicity against cancer cells. The current study was undertaken to determine its mechanism. Series studies was conducted to show that RAP is able to induce much higher gene expression of M1 markers, including iNOS, IL-6, TNF-a, and CXCL10, compared with the control group. When RAP-induced BMDMs were transplanted together with 4T1 tumor cells in BALB/c mice, both tumor volume and tumor weight decreased. Further studies indicated that RAP induces the Notch signaling pathway in RAW264.7 cells. The function of Notch signaling in macrophage polarization was confirmed by using -secretase inhibitor. These results suggested that Astragalus polysaccharide RAP induces macrophage's polarization to M1 phenotype via the Notch signaling pathway.

Original languageEnglish
Article number2016
Issue number10
Publication statusPublished - 2 May 2019

Scopus Subject Areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

User-Defined Keywords

  • Astragali Radix
  • M1 markers
  • Macrophages
  • Notch signaling
  • Polysacchairdes
  • Tumoricidal responses


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