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Growth Inhibition and Induction of Apoptosis in U937 Cells by Coptis chinensis Extract
Author(s) -
Ma C.Y.,
Shen S.C.,
Huang D.W.,
Chang H.M.,
Wu J.S.B.
Publication year - 2008
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2008.00837.x
Subject(s) - u937 cell , apoptosis , monocytic leukemia , microbiology and biotechnology , dna fragmentation , downregulation and upregulation , cytokine , peripheral blood mononuclear cell , chemistry , biology , coptis chinensis , leukemia , biochemistry , programmed cell death , immunology , in vitro , medicine , alternative medicine , traditional chinese medicine , pathology , gene
ABSTRACT: Dried Coptidis Rizoma was extracted with boiling water. Conditioned medium was prepared by stimulating human peripheral blood mononuclear cells with Coptidis Rizoma extract (CR). The conditioned medium was then added to human leukemic U937 cells suspension for investigating the antiproliferation effect and the induction of apoptosis. Apparent DNA fragmentation and morphological changes occurred in U937 cells after incubating for 48 h to 72 h with the conditioned medium that had been prepared with 400 μg CR solids/mL. Flow cytometric analysis revealed that the percentage of apoptotic U937 cells increased in a time‐ and concentration‐dependent manner. The upregulation of Bax expression, the downregulation of Bcl‐2 and procaspase‐3 expression, and the release of cytochrome c from the mitochondria in U937 cells were all observed. Reverse transcription–polymerase chain reaction detected cytokine‐related mRNA expressions in human mononuclear cells incubated with CR. An increase in the concentration of CR in culturing medium downregulated granulocyte macrophage colony‐stimulatory factor mRNA expression while upregulated interleuken‐2 mRNA expression. All the above‐mentioned evidences suggest that CR induces the apoptosis of human leukemic U937 cells via the changes in cytokine profile and protein expressions in mitochondria pathway and that CR has the potential to be used in the therapy of leukemia due to its strong apoptosis‐promoting effect.