Abstract | OBJECTIVE: To explore the regulative role of decorin on the ECM gene-expression in diabetic nephropathy, recombinant adenovirus expressing rat decorin (Ad- decorin) was constructed to further investigate the effects of decorin overproduction on the expression of TGFbeta1 and ECM in rat mesangial cells (RMCs) in high glucose condition. METHODS: The recombinant decorin adenovirus and lacz adenovirus(Ad-lacz), as a control, were constructed. RT-PCR, restriction enzyme digestion, western blot and gene sequence were used for validating correctness of Ad- decorin. MTT was used to examine the biological function of decorin ( decorin expressed by Ad- decorin transduced CHO cells was used to interact with TGFbeta1 which can inhibit the proliferation of Mv1Lu cells). Then Ad- decorin was transferred into rat mesangial cells cultured in high- glucose (450 mg/dL) media and Ad-lacz was as the control transducer. TGFbeta1, decorin, collagen IV, fibronectin, laminin and tenascin mRNA in RMCs at 24, 48 and 72 hours after Ad- decorin infection were determined with RT-PCR. The distribution and expression of TGFbeta1 protein was detected in RMCs at 96 hours after Ad- decorin infection by immunoperoxidase cell staining. RESULTS: RT-PCR, restriction enzyme digestion, western blot and gene sequence all confirmed that Ad- decorin could express correct decorin mRNA and protein. MTT showed that decorin protein expressed by Ad- decorin-transfected CHO cells abrogated the inhibitive effect of TGFbeta1 on the proliferation of Mv1Lu cells. Decorin mRNA significantly increased in Ad- decorin transduced RMCs at all the observed time points, reached the peak at 24 hours(2.2-fold, P<0.05) and the overexpression lasted to the end of the observation at 72 hours(1.7-fold, P<0.05) compared to that in Ad-lacz transduced RMCs. Meanwhile, TGFbeta1 mRNA level began to fall at 48 hours (-20%, P<0.05) in Ad- decorin transduced RMCs and went to the valley at 72 hours (-46, P<0.05). ECM components, such as tenascin, laminin, fibronectin and collagen IV, were reduced notably in the Ad- decorin transduced RMCs from the 48 hours to the end of study versus those in the Ad-lacz transduced RMCs. Cellular immunohistochemistry further confirmed that the Ad- decorin transduced RMCs produced much less TGFbeta1 compared with the Ad-lacz transduced RMCs. CONCLUSION: The constructed recombinant decorin adenovirus can highly efficiently express biologically active decorin. Overexpression of decorin down-regulates the expression of TGFbeta1 and ECM components from RMCs. These results suggest that overexpression of decorin may be one of the therapeutic approaches to diabetic nephropathy.
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Authors | F Wu, H Yao, A Bader, F Dong, F Zhu, N Wu, B Wang, H Li, N H Brockmeyer, P Altmeyer |
Journal | European journal of medical research
(Eur J Med Res)
Vol. 12
Issue 8
Pg. 360-8
(Aug 16 2007)
ISSN: 0949-2321 [Print] England |
PMID | 17933714
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- DNA, Complementary
- Dcn protein, rat
- Decorin
- Extracellular Matrix Proteins
- Proteoglycans
- Transforming Growth Factor beta
- betaIG-H3 protein
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Topics |
- Adenoviridae
(genetics)
- Animals
- CHO Cells
(metabolism)
- Cricetinae
- Cricetulus
- DNA, Complementary
(biosynthesis)
- Decorin
- Extracellular Matrix
(metabolism)
- Extracellular Matrix Proteins
(genetics, metabolism)
- Gene Amplification
- Gene Transfer Techniques
- Genetic Vectors
- Immunoenzyme Techniques
- Mesangial Cells
(metabolism)
- Proteoglycans
(genetics, metabolism)
- Rats
- Rats, Sprague-Dawley
- Transduction, Genetic
- Transforming Growth Factor beta
(genetics, metabolism)
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