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Abstract
Objectives
To
evaluate the effect of minocycline on the expression of cytokines and
growth factors responsible for malignant ascite formation.
Methods
In vitro, cells obtained from malignant ascites were pre-treated with minocycline (0–100 μmol/L) and exposed briefly to hypoxia. In vivo,
female nude mice bearing OVCAR-3 tumors were treated orally in drinking
water with minocycline for 4 weeks. Plasma, ascites, and tumors were
analyzed.
Results
Minocycline
blocked hypoxia-induced surge in interleukin-6 (IL-6), its soluble
receptor (sIL-6R) and vascular endothelial growth factor (VEGF) levels
in concentration-dependent manner. In mice, orally administered
minocycline led to dramatic reduction in tumor weight and malignant
ascite volume. IL-6, sIL6R and in particular VEGF levels were highly
suppressed in plasma, ascite fluid and tumor tissue by minocycline. In
addition, tumors from minocycline treated mice expressed profoundly
lower levels of phosphorylated extracellular regulated kinases
(p-Erk1/2) and p-Akt. Minocycline was also effective at suppressing
transforming growth factor beta (TGF-β1) and increasing vascular
endothelial cadherin (VE-cadherin) expression thereby providing
molecular confirmation for its effects on malignant ascite formation.
Conclusion
Orally
administered minocycline is highly effective in suppressing ovarian
cancer-induced malignant ascites by targeting cytokines and growth
factors essential for tumor growth and malignant ascite formation.
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