Song SL, Gong ZJ, Zhang QR. Expression of TGFβ1 and its receptors, Smad3 andSmad7 in rats with experimental liver fibrosis.
Shijie Huaren Xiaohua Zazhi 2004;
12:676-679. [DOI:
10.11569/wcjd.v12.i3.676]
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Abstract
AIM: To investigate the expression of TGFβ1, TGFRⅠ,TGFR Ⅱ, Smad3, Smad7 in fibrotic liver induced by the exposure of carbon tetrachloride (CCl4) in rats.
METHODS: A total of 24 Wistar rats were randomly allocated into two study groups: normal group and model group-CCl4 rats. The latter group was administered with CCl4 solution to induce liver fibrosis. All the rats were killed after 8 wks. The level of TGFβ1, TGFR Ⅰand TGFRⅡmRNA were examined by RT-PCR. The expression of TGF-1, Smad3 and Smad7 were detected by immunohistochemical staining in liver tissue. The serum hyalauronic acid (HA) and the liver histopathology were also examined by RIA and HE staining respectively.
RESULTS: In comparison with the normal group, TGFβ1, TGFR Ⅰ and TGFRⅡmRNA were significantly increased in model rats, the expression of TGF-1 and Smad3 was increased and the expression of Smad7 was decreased in livers of the model group (TGF-1, Smad3 and Smad7 in normal and model group were 0.61±0.33 vs 1.57±0.53, 0.248±0.042 vs 0.785±0.904, 4.674±1.143 vs 0.470±0.097 respectively, P < 0.05). The content of serum HA was increased in model rats (HA in normal and model group was(78.4±19.2 g/L) vs (263.2±107.0) g/L, P < 0.01). The histological changes of fibrosis were also remarkable.
CONCLUSION: TGFβ1/TGF receptors /Smad signaling involve the formation and development of liver fibrosis. The TGFβ1 /Smad signal pathway plays key roles in liver fibrogensis. It may be a new pathway for the treatment of liver fibrosis.
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