Abstract
Silymarin and harpagoside are derived from drugs which are used for their protective effects against hepatotoxicity and inflammatory processes. Both are now investigated with respect to the respiratory tract. They were able to reduce the release of the inflammatory cytokine RANTES (regulated on activation, normal T cells expressed and secreted) from BEAS-2B cells in a concentration-dependent manner when stimulated by a cytokine mix (10 ng/mL of TNF- α and IFN- γ). This effect was not due to a possible toxic effect (control experiments using LDH release as a marker). Silymarin but not harpagoside was able to increase ciliary beat frequency. Effects were comparable to positive controls (isoprenaline and salbutamol). Silymarin also increases mucociliary clearance. In conclusion, silymarin should be further investigated for its clinical use in distinct respiratory diseases.
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