title: Inhibitory effect of tumor necrosis factor-alpha secretion from rat astrocytes by Chilbokeum.
abstract: Substance P (SP) can stimulate secretion of tumor necrosis factor-alpha (TNF-alpha) from astrocytes stimulated with lipopolysaccharide (LPS). In this study, we have examined whether an aqueous extract of Chilbokeum inhibits secretion of TNF-alpha from primary cultures of rat astrocytes. Chilbokeum (10 microg/ml) significantly inhibited the TNF-alpha secretion by astrocytes stimulated with LPS and SP. Interleukin-1 (IL-1) has been shown to elevate TNF-alpha secretion from LPS-stimulated astrocytes while having no effect on astrocytes in the absence of LPS. We therefore examined whether IL-1 mediated inhibition of TNF-alpha secretion from primary astrocytes by Chilbokeum. Treatment of Chilbokeum (10 and 100 microg/ml) to astrocytes stimulated with both LPS and SP decreased IL-1 secretion significantly. Moreover, the secretion of TNF-alpha by LPS and SP in astrocytes was progressively inhibited with increasing amount of IL-1 neutralizing antibody. Our results suggest that Chilbokeum may inhibit TNF-alpha secretion by inhibiting IL-1 secretion and that Chilbokeum has an antiinflammatory activity in the central nervous system.
authors.affiliation: Department of Oriental Pharmacy, College of Pharmacy, Center of Oriental Medicinal Science, Wonkwang University, Iksan, South Korea.
authors.forename: H M
authors.initials: HM
authors.lastname: Kim
authors.forename: T Y
authors.initials: TY
authors.lastname: Shin
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000187:drug effects* / Q000378:metabolism*; D001921:Brain / Q000166:cytology; D002478:Cells, Cultured; D004347:Drug Interactions; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D007118:Immunoassay; D007375:Interleukin-1 / Q000378:metabolism; D053583:Interleukin-1beta; D008070:Lipopolysaccharides / Q000494:pharmacology; D017628:Microglia / Q000187:drug effects / Q000276:immunology; D010446:Peptide Fragments / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry*; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar; D013373:Substance P / Q000494:pharmacology; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
chemical_list: D007375:Interleukin-1; D053583:Interleukin-1beta; D008070:Lipopolysaccharides; D010446:Peptide Fragments; D010936:Plant Extracts; D014409:Tumor Necrosis Factor-alpha; C052994:interleukin-1beta (163-171); D013373:Substance P