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Anti-invasive activity of alkaloids and polyphenolics in vitro
V S Parmar1, M E Bracke, J Philippe
1Department of Chemistry, University of Delhi, India.
Abstract:
Invasiveness, the ability of certain tumour cells to migrate beyond their natural tissue boundaries, often leads to metastasis, and usually determines the fatal outcome of cancer. The need for anti-invasive agents has led us to search for possibly active compounds among alkaloids and polyphenolics. One hundred compounds were screened in an assay based on the confrontation of invasive human MCF-7/6 mammary carcinoma cells with fragments of normal embryonic chick heart in vitro. Anti-invasive activity was frequently found among chalcones having a prenyl group. Six compounds were found to inhibit invasion when added to the culture medium at concentrations as low as 1 microM. For at least three of them the anti-invasive effect could be associated with a cytotoxic effect on the MCF-7/6 cells, but not on the heart tissue. This selective cytotoxicity was substantiated by different methods, such as histology and growth assays (volume measurements, cell counts, MTT and sulforhodamine B assays). The anti-invasive effects of the compounds could neither be ascribed to induction of apoptosis nor to the promotion of cell-cell adhesion. Our data indicate that among the alkaloids and polyphenolics a number of molecules can inhibit growth and invasion of human mammary cancer cells via selective cytotoxicity.
Insights
Researchers screened 100 compounds for anti-cancer invasion properties. Six compounds, particularly prenyl chalcones, inhibited mammary tumor cell invasion and growth through selective cytotoxicity.
Area of Science:
- Oncology
- Pharmacology
- Biochemistry
Background:
- Tumor cell invasiveness is a critical factor in cancer metastasis and patient mortality.
- The development of effective anti-invasive agents is crucial for improving cancer treatment outcomes.
- Alkaloids and polyphenolics are classes of natural compounds with potential therapeutic properties.
Purpose of the Study:
- To identify novel anti-invasive agents from alkaloids and polyphenolics.
- To evaluate the efficacy of screened compounds against human mammary carcinoma cells.
- To investigate the mechanism of action of active anti-invasive compounds.
Main Methods:
- Screening of 100 compounds using an in vitro assay with invasive human MCF-7/6 mammary carcinoma cells and embryonic chick heart fragments.
- Assessment of anti-invasive activity at low micromolar concentrations.
- Evaluation of selective cytotoxicity using histology, growth assays, cell counts, and MTT/sulforhodamine B assays.
Main Results:
- Anti-invasive activity was frequently observed among chalcones containing a prenyl group.
- Six compounds demonstrated significant inhibition of cancer cell invasion at 1 microM.
- At least three compounds exhibited selective cytotoxicity towards MCF-7/6 cells, sparing normal heart tissue.
- The anti-invasive effects were not attributed to apoptosis induction or increased cell-cell adhesion.
Conclusions:
- Certain alkaloids and polyphenolics, particularly prenyl chalcones, possess potent anti-invasive properties against human mammary cancer cells.
- Selective cytotoxicity is a key mechanism by which these compounds inhibit cancer cell growth and invasion.
- These findings highlight the potential of natural compounds as a source for developing novel anti-cancer therapeutics.