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Antiproliferative activity of withanolides against human breast cancer cell lines
Rubén P Machin1, Adriana S Veleiro, Viviana E Nicotra
1Unidad de Investigacion, Hospital Universitario de Gran Canaria Dr. Negrin, Bco. Ballena s/n 35010, Las Palmas de Gran Canaria, Spain.
Abstract:
The in vitro antiproliferative activity of a series of 22 naturally occurring withanolides was examined against the T-47D, MCF7, MCF7/BUS, MDA-MB-231, and SK-Br-3 human solid tumor breast cancer cell lines. The most active compound showed GI(50) values in the range 0.16-0.71 muM. The aromatic withanolide 19 exhibited specific activity for the estrogen-receptor-positive cell lines (T-47D, MCF7, and MCF7/BUS). Overall, the results demonstrated the relevance of the substitution pattern on the A and B rings on the resultant antiproliferative activity.
Insights
Naturally occurring withanolides show promising antiproliferative activity against human breast cancer cell lines. Specific compounds demonstrated targeted efficacy, highlighting the importance of their chemical structure for potential therapeutic development.
Area of Science:
- Natural Products Chemistry
- Pharmacology
- Oncology
Background:
- Breast cancer remains a significant global health challenge.
- Withanolides are a class of naturally occurring steroidal lactones with diverse biological activities.
- Identifying novel anticancer agents from natural sources is crucial for drug discovery.
Purpose of the Study:
- To evaluate the in vitro antiproliferative effects of 22 natural withanolides.
- To identify specific withanolides with potent activity against human breast cancer cell lines.
- To investigate the structure-activity relationship of withanolides concerning breast cancer cell proliferation.
Main Methods:
- In vitro screening of 22 withanolides against five human breast cancer cell lines (T-47D, MCF7, MCF7/BUS, MDA-MB-231, SK-Br-3).
- Determination of half-maximal growth inhibition (GI50) values.
- Assessment of compound activity based on estrogen receptor status of cell lines.
Main Results:
- Several withanolides exhibited significant antiproliferative activity, with GI50 values ranging from 0.16 to 0.71 μM.
- Aromatic withanolide 19 displayed selective activity against estrogen-receptor-positive cell lines (T-47D, MCF7, MCF7/BUS).
- The substitution pattern on the A and B rings of withanolides was found to be critical for their antiproliferative efficacy.
Conclusions:
- Naturally occurring withanolides possess potent in vitro antiproliferative activity against human breast cancer cells.
- Withanolide 19 shows potential as a targeted therapeutic agent for estrogen-receptor-positive breast cancers.
- Structural modifications on the A and B rings of withanolides could be a strategy for developing novel breast cancer therapeutics.
