Effects of a high molecular mass Convolvulus arvensis extract on tumor growth and angiogenesis
P. R. health sci. j
;
21(4): 323-338, Dec. 2002.
Article
in English
| LILACS
| ID: lil-356232
RESUMO
BACKGROUND:
Plant materials represent promising sources of anti-cancer agents. We developed and tested a novel extract from the ubiquitous plant Convolvulus arvensis. MATERIALS ANDMETHODS:
Convolvulus arvensis components were extracted in boiling water, and small molecules were removed by high-pressure filtration. The extract's biological activity was assessed by measuring its effects on S-180 fibrosarcoma growth in Kun Ming mice and on heparin-induced angiogenesis in chick embryos. We also examined the extract's effects on lymphocytes ex vivo and tumor cell growth in vitro.RESULTS:
The extract (primarily proteins and polysaccharides) inhibited tumor growth in a dose-dependent fashion when administered orally. At the highest dose tested, 200 mg/kg/day, tumor growth was inhibited by roughly seventy percent. Subcutaneous or intraperitoneal administration at 50 mg/kg/day also inhibited tumor growth by over seventy percent. The extract's acute LD50 in Kun Ming mice was 500 mg/kg/day when injected, indicating that tumor growth inhibition occurred at non-toxic doses. It inhibited angiogenesis in chick embryos, improved lymphocyte survival ex vivo, and enhanced yeast phagocytosis, but did not kill tumor cells in culture.CONCLUSION:
High molecular mass extract deserves further study as an anti-cancer agent.
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Index:
LILACS (Americas)
Main subject:
Plant Preparations
/
Convolvulus
/
Phytotherapy
/
Neoplasms
/
Neovascularization, Pathologic
Limits:
Humans
Language:
English
Journal:
P. R. health sci. j
Journal subject:
Medicine
Year:
2002
Type:
Article
Affiliation country:
United States
Institution/Affiliation country:
Center for the Improvement of Human Functioning/US
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