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Hyperforin, the Active Component of St. John’s Wort, Induces IL-8 Expression in Human Intestinal Epithelial Cells Via a MAPK-Dependent, NF-κB-Independent Pathway

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Abstract

St. John’s wort is widely used as an herbal antidepressant and is among the top-selling botanical products in the United States. Although St. John’s wort has been reported to have minimal side effects compared with other antidepressants, here we show that hyperforin, the active component of St. John’s wort, can stimulate interleukin-8 (IL-8) expression in human intestinal epithelia cells (IEC) and primary hepatocytes. Hyperforin is also able to induce expression of mRNA, encoding another major inflammatory mediator—intercellular adhesion molecule-1 (ICAM-1). IEC participate in the intestinal inflammatory process and serve as a first line of defense through bidirectional communication between host and infectious pathogens. Although hyperforin is a potent ligand for the steroid and xenobiotic receptor (SXR), we found that hyperforin induced IL-8 mRNA through an SXR-independent transcriptional activation pathway. IL-8 induction by hyperforin required the activation of AP-1 but not the NF-κB transcription factor, thereby distinguishing it from the NF-κB-dependent IL-8 induction mediated by tumor necrosis factor α (TNFα). Further study revealed that extracellular signal-regulated kinase 1 and 2 (ERK1/2) were required for the hyperforin-induced expression of IL-8. Our results suggest a previously unsuspected effect of St. John’s wort in modulating the immune and inflammatory responses.

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  1. Department of Developmental and Cell Biology, University of California, Irvine, California

    CHANGCHENG ZHOU, MICHELLE M. TABB, ASAL SADATRAFIEI, FELIX GRÜN, AIXU SUN & BRUCE BLUMBERG

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Correspondence to BRUCE BLUMBERG.

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ZHOU, C., TABB, M.M., SADATRAFIEI, A. et al. Hyperforin, the Active Component of St. John’s Wort, Induces IL-8 Expression in Human Intestinal Epithelial Cells Via a MAPK-Dependent, NF-κB-Independent Pathway. J Clin Immunol 24, 623–636 (2004). https://doi.org/10.1007/s10875-004-6248-z

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