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Salinomycin treatment reduces metastatic tumor burden by hampering cancer cell migration
Florian Kopp, Adam Hermawan, Prajakta Shirish Oak
1Pharmaceutical Biotechnology, Department of Pharmacy, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Munich 81377, Germany. andreas.roidl@cup.uni-muenchen.de.
Background:
Tumor spreading is the major threat for cancer patients. The recently published anti-cancer drug salinomycin raised hope for an improved treatment by targeting therapy-refractory cancer stem cells. However, an unambiguous role of salinomycin against cancer cell migration and metastasis formation remains elusive.
Findings:
We report that salinomycin effectively inhibits cancer cell migration in a variety of cancer types as determined by Boyden chamber assays. Additionally, cells were treated with doxorubicin at a concentration causing a comparable low cytotoxicity, emphasizing the anti-migratory potential of salinomycin. Moreover, single-cell tracking by time-lapse microscopy demonstrated a remarkable effect of salinomycin on breast cancer cell motility. Ultimately, salinomycin treatment significantly reduced the metastatic tumor burden in a syngenic mouse tumor model.
Conclusions:
Our findings clearly show that salinomycin can strongly inhibit cancer cell migration independent of the induction of cell death. We furthermore demonstrate for the first time that salinomycin treatment reduces metastasis formation in vivo, strengthening its role as promising anti-cancer therapeutic.
Insights
Salinomycin effectively inhibits cancer cell migration and reduces metastasis in preclinical models. This anti-cancer drug shows promise for improving treatments by targeting tumor spreading without significant cell death.
Area of Science:
- Oncology
- Cancer Biology
- Pharmacology
Background:
- Tumor spreading (metastasis) is a primary cause of cancer mortality.
- Salinomycin, an anti-cancer drug, has shown potential in targeting therapy-refractory cancer stem cells.
- The precise role of salinomycin in inhibiting cancer cell migration and metastasis formation requires further clarification.
Purpose of the Study:
- To investigate the effect of salinomycin on cancer cell migration and metastasis.
- To determine if salinomycin's anti-migratory effects are independent of cytotoxicity.
- To evaluate salinomycin's therapeutic potential in reducing metastatic tumor burden in vivo.
Main Methods:
- Boyden chamber assays were used to assess cancer cell migration across various cancer types.
- Comparative analysis with doxorubicin was performed at similar low cytotoxicity levels.
- Time-lapse microscopy was employed for single-cell tracking of breast cancer cell motility.
- A syngenic mouse tumor model was utilized to evaluate the in vivo effect of salinomycin on metastatic burden.
Main Results:
- Salinomycin demonstrated significant inhibition of cancer cell migration in multiple cancer types.
- The anti-migratory effect of salinomycin was observed at concentrations with minimal cytotoxicity.
- Single-cell tracking revealed a marked reduction in breast cancer cell motility upon salinomycin treatment.
- Salinomycin administration led to a significant decrease in metastatic tumor burden in the mouse model.
Conclusions:
- Salinomycin effectively inhibits cancer cell migration independently of inducing cell death.
- This study provides the first in vivo evidence of salinomycin reducing metastasis formation.
- Salinomycin emerges as a promising therapeutic agent for combating cancer metastasis.
