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Journal of Chinese Integrative Medicine ›› 2008, Vol. 6 ›› Issue (9): 946-951.doi: 10.3736/jcim20080914

• Original Experimental Research • Previous Articles     Next Articles

Activator protein-1 mRNA expression, cell proliferation and collagen synthesis induced by tumor necrosis factor-α in cardiac fibroblasts from rats and the effect of Qiangxin Decoction

Yan Shen1, Shi-yun Yan2()   

  1. 1. Department of Cardiology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
    2. Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
  • Received:2008-01-16 Online:2008-09-20 Published:2008-09-15

Objective: To investigate the function of activator protein-1 (AP-1) in proliferation and collagen synthesis of cardiac fibroblasts (CFs) in neonatal rats induced by tumor necrosis factor-α (TNF-α), and to explore the mechanism of Qiangxin Decoction (QXD), a compound traditional Chinese herbal medicine, in reversing cardiac fibrosis.
Methods: CFs derived from neonatal rats were cultured with enzymatic dissociation, and fibrosis of the CFs was induced by TNF-α. The CFs were divided into normal control group, untreated group, 5% QXD-containing serum group, 10% QXD-containing serum group and 20% QXD-containing serum group. After 24-hour culture of QXD-containing serum, AP-1 mRNA was detected by real-time fluorescent quantitative polymerase chain reaction; proliferation and collagen synthesis of CFs were assayed by thiazolyl blue assay (MTT) and measured by hydroxyproline respectively, in order to determine the effect of different dosage decoction on the proliferation and collagen synthesis of CFs.
Results: After 24-hour stimulation of TNF-α in CFs, compared with those in normal control group, the expression of AP-1 mRNA and cardiac fibroblast proliferation and collagen synthesis increased significantly (P<0.05). However, Qiangxin Decoction could reduce the expression of AP-1 mRNA and decreased the proliferation and collagen synthesis of CFs significantly (P<0.05).
Conclusion: Qiangxin Decoction can inhibit proliferation and collagen synthesis of CFs induced by TNF-α, and reverse cardiac fibrosis, which may be related to its down-regulation of the expression of AP-1.

Key words: cardiac fibrosis, cardiac remodeling, tumor necrosis factor-a, activator protein-1, Qiangxin Decoction, rats

CLC Number: 

  • R289.5

Table 1

Effect of Qiangxin Decoction-containing serum on proliferation of CFs(x±s)"

Group n A value
Normal control 8 0.618±0.187
Untreated 8 0.925±0.249*
5% QXD-containing serum 8 0.661±0.118
10% QXD-containing serum 8 0.645±0.189
20% QXD-containing serum 8 0.723±0.278

Table 2

Effect of Qiangxin Decoction-containing serum on hydroxyproline in cultured CFs(x±s, μg/ml)"

Group n Hydroxyproline content
Normal control 6 1.105±0.528
Untreated 6 1.975±0.873*
5% QXD-containing serum 6 1.724±0.759
10% QXD-containing serum 6 1.138±0.779
20% QXD-containing serum 6 1.992±0.976

Table 3

Effect of Qiangxin Decoction-containing serum on AP-1 expression in cultured CFs(x±s,×103 copy)"

Group n AP-1 mRNA
Normal control 4 2.792±0.146
Untreated 4 17.399±1.498*
5% QXD-containing serum 4 12.308±2.170
10% QXD-containing serum 4 9.552±0.855
20% QXD-containing serum 4 15.256±2.910
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