Changes in TGF-beta1/Smads signaling pathway in rats with chemical hepatocarcinogenesis / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1848-1852, 2008.
Article
in Chinese
| WPRIM
| ID: wpr-321803
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the changes in transforming growth factor beta 1 (TGF-beta1)/Smads signaling pathway in rats with chemical hepatocarcinogenesis.</p><p><b>METHODS</b>Fresh diethylnitrosamine (DENA) solution was administered in SD rats to induce hepatocellular carcinoma (HCC). The protein expressions of TGF-beta1, phosphorylated Smad2, Smad4 and Smad7 were detected in these rats with immunohistochemistry, and the mRNA expression of Smad4 was evaluated with RT-PCR.</p><p><b>RESULTS</b>Cirrhotic nodules occurred in the rats 8 weeks after DENA treatment, and HCC nodules were found 16 weeks after the treatment. In the normal liver tissue, very low levels of TGF-beta1 and Smad4 expressions, low Smad7 expression and high phosphorylated Smad2 expression were detected. The development of liver cirrhosis was accompanied by increased expressions of TGF-beta1, Smad4 and Smad7 but at 8 weeks after DENA treatment, the expression of phosphorylated Smad2 was significantly decreased, followed then by gradual increment till nearly the normal level. Twenty-two weeks after DENA treatment, Smad4 expression in liver tissue decreased markedly as compared with the levels at 8 and 16 weeks. The expressions of Smad4 and phosphorylated Smad2 in the HCC tissue was significantly lower than those in normal liver tissue.</p><p><b>CONCLUSION</b>Hepatocarcinogenesis involves very complex mechanisms, can can be related partially to the decreased Smad4 and phosphorylated Smad2 expression and TGFbeta1 and Smad7 overexpression in advanced stage of liver cirrhosis.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pathology
/
Signal Transduction
/
Rats, Sprague-Dawley
/
Diethylnitrosamine
/
Smad7 Protein
/
Smad2 Protein
/
Smad4 Protein
/
Transforming Growth Factor beta1
/
Genetics
/
Liver Neoplasms, Experimental
Limits:
Animals
Language:
Chinese
Journal:
Journal of Southern Medical University
Year:
2008
Type:
Article
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