Document Detail

Genistein at a concentration present in soy infant formula inhibits Caco-2BBe cell proliferation by causing G2/M cell cycle arrest.
MedLine Citation:
PMID:  15173388     Owner:  NLM     Status:  MEDLINE    
Fifteen percent of all U.S. infants are fed soy formulas containing up to 47 mg/L of isoflavones (>65% as genistin + genistein); thus, these infants' intestines are exposed to a high dose of genistein, a phytoestrogen and tyrosine kinase inhibitor. Little attention has been focused on genistein's impact on the developing intestine. We hypothesized that a high dose of genistein would inhibit intestinal cell growth. Caco-2BBe human intestinal cells were exposed to 0, 3.7, and 111 micro mol/L (0, 1, and 30 mg/L) genistein in DMEM + 0.5% fetal bovine serum for 24-48 h. Cell number, thymidine incorporation, apoptosis, and cell cycle analyses were performed. The low genistein concentration increased intestinal cell proliferation by 28% (P = 0.001), but did not affect cell number or caspase-3 activity compared to the control. Furthermore, the addition of ICI, an estrogen receptor antagonist, negated the proliferative effect of the low genistein. In contrast, the high genistein concentration reduced cell number by 40%, proliferation by 94%, and caspase-3 activity by 50% compared to the control (P < 0.05). Cell cycle analysis after 48 h exposure to high genistein revealed 37% of cells in G0/G1 and 35% in G2/M vs. 71% in G0/G1 and 17% in G2/M for the control and low genistein groups. Thus, a biphasic effect of genistein was seen with a low dose stimulating intestinal cell proliferation through the estrogen receptor, whereas a high dose of genistein inhibited intestinal cell proliferation and altered cell cycle dynamics. A high dose of genistein may potentially compromise intestinal growth.
An-Chian Chen; Sharon M Donovan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of nutrition     Volume:  134     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-06-02     Completed Date:  2004-07-15     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1303-8     Citation Subset:  IM    
Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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MeSH Terms
Apoptosis / drug effects
Blotting, Western
Caco-2 Cells / cytology*
Cell Count
Cell Cycle / drug effects
Cell Division / drug effects
Dose-Response Relationship, Drug
G2 Phase / drug effects*
Genistein / pharmacology*
Growth Inhibitors / pharmacology*
Infant Food*
Mitosis / drug effects*
Osmolar Concentration
Soy Foods*
Reg. No./Substance:
0/Growth Inhibitors; 446-72-0/Genistein

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

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