Abstract
Aim:
To investigate the effects of glycyrrhetinic acid (GA), an active component extracted from the root of Glycyrrhizae glabra, on the expression of intercellular adhesion molecule-1 (ICAM-1) in tumor necrosis factor-α (TNF-α)-activated human umbilical vein endothelial cells (HUVEC).
Methods:
ICAM-1 mRNA and protein levels were detected using RT-PCR and cell enzyme-linked immunosorbent assays. The adherence of human monocytic THP-1 cells labeled with [3H]thymidine to HUVEC was determined by counting radioactivity with a scintillation counter. The activation of mitogen-activated protein kinases as well as the degradation of IκB and nuclear factor-κB (NF-κB) or phospho-c-Jun in the nucleus were detected by western blots. NF-κB binding activity was detected using electrophoretic mobility shift assay.
Results:
GA (50 and 100 μmol/L) significantly inhibits TNF-α-induced ICAM-1 mRNA and protein expressions, as well as THP-1 cell adhesiveness in HUVEC. GA selectively inhibited TNF-α-activated signal pathway of c-Jun N-terminal kinase (JNK), without affecting extracellular signal-regulated kinase 1/2 and p38. Furthermore, GA apparently inhibited IκB/NF-κB signaling system by preventing IκB degradation, NF-κB translocation, and NF-κB/DNA binding activity. Finally, pretreatment with GA or the inhibitors of NF-κB, JNK, and p38 reduced the ICAM-1 protein expression induced by TNF-α.
Conclusion:
GA inhibits TNF-α-stimulated ICAM-1 expression, leading to a decrease in adherent monocytes to HUVEC. This inhibition is attributed to GA interruption of both JNK/c-Jun and IκB/NF-κB signaling pathways, which decrease activator protein-1 (AP-1) and NF-κB mediated ICAM-1 expressions. The results suggest that GA may provide a beneficial effect in treating vascular diseases associated with inflammation, such as atherosclerosis.
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Acknowledgements
This work was supported by grants CMRP-D34010, CMRP-D140251, and CMRP-G1356 from Chang Gung Medical Research Foundation, Taiwan.
We thank Dr Nigel WISEMAN for critical reading of this manuscript and Yi-jun LIU for her expert technical assistance.
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Chang, Yl., Chen, Cl., Kuo, CL. et al. Glycyrrhetinic acid inhibits ICAM-1 expression via blocking JNK and NF-κB pathways in TNF-α-activated endothelial cells. Acta Pharmacol Sin 31, 546–553 (2010). https://doi.org/10.1038/aps.2010.34
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DOI: https://doi.org/10.1038/aps.2010.34
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