Document Detail

Quercetin-induced apoptosis in the monoblastoid cell line U937 in vitro and the regulation of heat shock proteins expression.
MedLine Citation:
PMID:  11205268     Owner:  NLM     Status:  MEDLINE    
Quercetin, a widely distributed plant flavonoid, inhibits the growth of tumor cells and the expression of heat shock proteins. In this study, we examined quercetin-induced apoptosis of U937 cells in vitro and the regulation of heat shock proteins expression. The quercetin-induced apoptosis was demonstrated to be dose- and time-dependent. Flow cytometry analysis revealed that sub-G1 peak appeared at 12 hours, 24 hours and 48 hours respectively when treated with 50 mM of quercetin and at 6 hours, 12 hours, 24 hours and 48 hours with 100 mM of quercetin. Agarose gel electrophoresis demonstrated a typical ladder-like pattern of DNA fragments in the same time intervals with 50 mM of quercetin and at 6 hours only with 100 mM of quercetin. The distribution of DNA contents showed that U937 cells were accumulated mainly at G2/M phase when incubated with 50 mM of quercetin for 24 hours and 48 hours. There was no specific effect on cell cycle distribution at 100 mM of quercetin. On exposure to 100 mM of quercetin, the inhibition of hsp27 and hsp70 expression was observed from 12 hours to 48 hours and 6 hours to 48 hours respectively. The inhibition of hsp90 expression was not found eiyher at 50 mM or 100 mM of quercetin exposure. When incubated with 50 mM of quercetin, there was no inhibitory effect on hsp27, hsp70 and hsp90 expression by the Western blot analysis. These results suggested that it is dependent on the dose and exposure time of quercetin to induce apoptosis of U937 cells in vitro, to affect the cell cycle distribution and to regulate the expression of hsp27 and hsp70.
Y Rong; E B Yang; K Zhang; P Mack
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Anticancer research     Volume:  20     ISSN:  0250-7005     ISO Abbreviation:  Anticancer Res.     Publication Date:    2000 Nov-Dec
Date Detail:
Created Date:  2001-02-06     Completed Date:  2001-03-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8102988     Medline TA:  Anticancer Res     Country:  Greece    
Other Details:
Languages:  eng     Pagination:  4339-45     Citation Subset:  IM    
Department of Experimental Surgery, Singapore General Hospital, Outram Road, Singapore 169608, Republic of Singapore.
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MeSH Terms
Apoptosis / physiology*
Blotting, Western
Cell Cycle / drug effects*,  physiology
DNA / drug effects
DNA Fragmentation
Dose-Response Relationship, Drug
Electrophoresis, Agar Gel
HSP70 Heat-Shock Proteins / drug effects,  metabolism
HSP90 Heat-Shock Proteins / drug effects,  metabolism
Heat-Shock Proteins / drug effects*,  metabolism
Intracellular Signaling Peptides and Proteins
Protein-Serine-Threonine Kinases / drug effects,  metabolism
Quercetin / pharmacology*
S Phase
Time Factors
U937 Cells / drug effects
Reg. No./Substance:
0/HSP70 Heat-Shock Proteins; 0/HSP90 Heat-Shock Proteins; 0/Heat-Shock Proteins; 0/Intracellular Signaling Peptides and Proteins; 117-39-5/Quercetin; 9007-49-2/DNA; EC 2.7.1.-/MAP-kinase-activated kinase 2; EC Kinases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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