The herbal medicine Sairei-to inhibits proliferation of rat mesangial cells.

Abstract:

BACKGROUND:The herbal medicine Sairei-to is efficacious in renal diseases where mesangial proliferation is a key event. We examined whether Sairei-to inhibits proliferation of cultured rat mesangial cells and investigated its mechanism of action. METHODS:The effect of Sairei-to on [(3)H]-thymidine incorporation stimulated by serum was assessed. Cell cycle was analyzed by flowcytometry. Extracellular signal-regulated kinase (ERK) activity was determined by immunecomplex kinase assay. Tyrosine phosphorylation of cellular proteins, and phosphorylation of ERK and Raf-1 were analyzed by immunoblot. Cyclic AMP was measured by radioimmunoassay. RESULTS:Incubation of mesangial cells for 18 h with water-soluble but not insoluble fraction of Sairei-to inhibited serum-stimulated [(3)H]-thymidine incorporation. In subsequent experiments, water-soluble fraction, at a dose required for a half-maximal response (2 mg/ml), was used. Sairei-to inhibited S-phase entry stimulated by serum. Serum-induced tyrosine phosphorylation of p44 and p42 ERK was inhibited by Sairei-to, but that of other cellular proteins was not affected. Suppression of serum-stimulated ERK activation by Sairei-to was confirmed by immunecomplex kinase assay. Activation of Raf-1, an upstream activator of ERK, was also attenuated by Sairei-to. Incubation of cells with Sairei-to significantly increased the generation of cAMP. CONCLUSIONS:Sairei-to inhibits serum-induced DNA synthesis of rat mesangial cells by suppressing Raf-1/ERK cascade probably via cAMP.

journal_name

Nephron

journal_title

Nephron

authors

Awazu M,Fujita H,Omori S,Hida M

doi

10.1159/000064112

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

652-9

issue

3

eissn

1660-8151

issn

2235-3186

pii

64112

journal_volume

92

pub_type

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