Wu YH, Chuang SY, Hong WC, Lai YJ, Chang YL, Pang JHS. In vivo and in vitro inhibitory effects of a traditional Chinese formulation on LPS-stimulated leukocyte-endothelial cell adhesion and VCAM-1 gene expression.
J Ethnopharmacol 2012;
140:55-63. [PMID:
22226975 DOI:
10.1016/j.jep.2011.12.002]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 11/28/2011] [Accepted: 12/02/2011] [Indexed: 05/31/2023]
Abstract
AIM OF THE STUDY
A traditional Chinese formulation Huang-Lian-Jie-Du-Tang (HLJDT) exerts anti-inflammatory effects. The present study aimed to investigate the effect of HLJDT on the LPS-stimulated leukocyte-endothelial cell adhesion and VCAM-1 gene expression both in vivo and in vitro.
MATERIALS AND METHODS
HLJDT was extracted from rhizoma coptidis, radix scutellariae, cortex phellodendri and fructus gardeniae in a weight rario of 1:1:1:1. In vivo leukocyte-endothelial cell adhesion was observed in rat lung after LPS stimulation (5mg/kg, i.p.) with or without HLJDT (350 or 700mg/kg, i.g.) pretreatment. The protein expression of vascular cell adhesion molecule 1 (VCAM-1) was analyzed by immunohistochemical method. In vitro leukocyte-endothelial cell adhesion was performed by examining the adhesion of THP-1cells to LPS-stimulated human vascular endothelial cells with or without HLJDT pretreatment. The VCAM-1 expression at the RNA and protein levels was investigated by RT-PCR and western blot analysis, respectively. The activation of NF-κB was examined by the nuclear translocation of NF-κB by immunocytochemical method.
RESULTS
In vivo, HLJDT dose-dependently reduced the number of leukocytes adhered to endothelium and VCAM-1 protein expression in lung venules of LPS-challenged rats. In vitro, HLJDT dose-dependently decreased the number of THP-1cells adhered to LPS-stimulated endothelial cells and the expression of VCAM-1 both at the RNA and protein levels. The LPS-induced nuclear translocation of NF-kappa B in endothelial cells was also dose-dependently inhibited by HLJDT.
CONCLUSIONS
The present study demonstrated an additional mechanism underlying the anti-inflmmatory effect of HLJDT by inhibiting the leukocyte-endothelial cell adhesion and VCAM-1 gene expression. The inhibition of NF-kappa B activation by HLJDT might suggest a profound anti-inflammatory consequences.
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