Hm. Kim et Ty. Shin, Inhibitory effect of tumor necrosis factor-alpha secretion from rat astrocytes by Chilbokeum, IMMUNOPH IM, 23(1), 2001, pp. 97-106
Substance P (SP) can stimulate secretion of tumor necrosis factor-alpha. (T
NF-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 mug/ml) significantly inhibited the TNF-alpha secretion by astrocytes s
timulated with LPS and SP. Interleukin-1 (IL-1) has been shown to elevate T
NF-alpha secretion from LPS-stimulated astrocytes while having no effect on
astrocytes in the absence of LPS. We therefore examined whether IL-1 media
ted inhibition of TNF-alpha secretion from primary astrocytes by Chilbokeum
. Treatment of Chilbokeum (10 and 100 mug/ml) to astrocytes stimulated with
both LPS and SP decreased IL-1 secretion significantly. Moreover, the secr
etion of TNF-alpha by LPS and SP in astrocytes was progressively inhibited
with increasing amount of IL-1 neutralizing antibody. Our results suggest t
hat Chilbokeum may inhibit TNF-alpha secretion by inhibiting IL-1 secretion
and that Chilbokeum has an antiinflammatory activity in the central nervou
s system.