Related Experiment Video
Updated: Jun 3, 2026
An Orthotopic Murine Model of Human Prostate Cancer Metastasis
Published on: September 18, 2013
Green tea extract selectively targets nanomechanics of live metastatic cancer cells
Sarah E Cross1, Yu-Sheng Jin, Qing-Yi Lu
1Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
Abstract:
Green tea extract (GTE) is known to be a potential anticancer agent (Yang et al 2009 Nat. Rev. Cancer 9 429-39) with various biological activities (Lu et al 2005 Clin. Cancer Res. 11 1675-83; Yang et al 1998 Carcinogenesis 19 611-6) yet the precise mechanism of action is still unclear. The biomechanical response of GTE treated cells taken directly from patient's body samples was measured using atomic force microscopy (AFM) (Binnig et al 1986 Phys. Rev. Lett. 56 930). We found significant increase in stiffness of GTE treated metastatic tumor cells, with a resulting value similar to untreated normal mesothelial cells, whereas mesothelial cell stiffness after GTE treatment is unchanged. Immunofluorescence analysis showed an increase in cytoskeletal-F-actin in GTE treated tumor cells, suggesting GTE treated tumor cells display mechanical, structural and morphological features similar to normal cells, which appears to be mediated by annexin-I expression, as determined by siRNA analysis of an in vitro cell line model. Our data indicates that GTE selectively targets human metastatic cancer cells but not normal mesothelial cells, a finding that is significantly advantageous compared to conventional chemotherapy agents.
Insights
Green tea extract (GTE) selectively targets metastatic cancer cells, increasing their stiffness and cytoskeletal-F-actin to resemble normal cells. This anticancer effect, mediated by annexin-I, offers a promising alternative to chemotherapy.
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Green tea extract (GTE) shows potential as an anticancer agent with unclear mechanisms.
- Understanding GTE's cellular effects is crucial for developing targeted cancer therapies.
Purpose of the Study:
- To investigate the biomechanical and structural changes in metastatic cancer cells treated with GTE.
- To elucidate the mechanism underlying GTE's selective action on cancer cells.
Main Methods:
- Atomic force microscopy (AFM) was used to measure cellular stiffness.
- Immunofluorescence analysis assessed cytoskeletal-F-actin.
- siRNA analysis identified the role of annexin-I.
Main Results:
- GTE significantly increased the stiffness of metastatic tumor cells, normalizing them to resemble untreated normal mesothelial cells.
- GTE treatment led to increased cytoskeletal-F-actin in tumor cells.
- Annexin-I expression was identified as a mediator of these changes.
Conclusions:
- GTE selectively targets human metastatic cancer cells, altering their mechanical and structural properties to mimic normal cells.
- The observed effects appear to be mediated by annexin-I expression.
- GTE presents a potentially advantageous therapeutic strategy due to its selective action on cancer cells over normal cells.
Related Concept Videos
02:57Targeted Cancer Therapies
There are several types of targeted therapies against specific...
02:30Metastasis
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...
02:38Mitogens and the Cell Cycle