Urokinase-type plasminogen activator gene therapy in liver cirrhosis is mediated by collagens gene expression down-regulation and up-regulation of MMPs, HGF and VEGF.
Human urokinase-type plasminogen activator (uPA) gene administration via an adenoviral (Ad)-vector induced cirrhosis regression and ameliorated hepatic dysfunction in a model of experimental liver cirrhosis. The administration of a single dose of 6 x 10(11) viral particles per kilogram of a clinical-grade Ad-vector was evaluated after the onset of rat liver cirrhosis via degradation of deposited collagen and a substantial decrease of alpha-sma-positive cells. Also, gene expression for pro-fibrogenic molecules (Col I, III, IV, TIMP-1 and PAI-1) was clearly down-regulated. In contrast, gene expression for collagen-degrading enzymes such as MMP-13 and MMP-2 was up-regulated. These events correlated with increased amounts of proteic free-TIMP-1, i.e. non-complexed with metalloproteinases (MMPs), indicating the presence of higher amounts of active MMPs inside the liver of cirrhotic animals treated with Ad-huPA. The harmonized and concerted expression of HGF and c-met resulted in exacerbated hepatocyte proliferation, although these events did not induce an abnormal liver growth. Angiogenesis, i.e. formation of new blood vessels, was evaluated by vascular endothelial growth factor (VEGF) expression which was notably detected to be 10 times higher during the first 6 days after Ad-huPA-treatment in cirrhotic animals as compared with controls. These events provide a clearer rationale as to how Ad-huPA-induced liver regeneration on CCl(4)-induced liver fibrosis takes place.
Bueno
Miriam
M
Institute for Molecular Biology and Gene Therapy, CUCS, University of Guadalajara, Apdo. Postal 2-123, Guadalajara, Jal, Mexico 44281.
Salgado
Silvia
S
Beas-Zárate
Carlos
C
Armendariz-Borunda
Juan
J
D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D001483:Base Sequence; D003094:Collagen / Q000235:genetics; D017931:DNA Primers / Q000235:genetics; D015536:Down-Regulation; D015316:Genetic Therapy; D005822:Genetic Vectors; D017228:Hepatocyte Growth Factor / Q000235:genetics; D006801:Humans; D008106:Liver Cirrhosis, Experimental / Q000201:enzymology / Q000235:genetics* / Q000473:pathology / Q000628:therapy*; D020782:Matrix Metalloproteinases / Q000235:genetics; D051381:Rats; D015854:Up-Regulation; D014568:Urokinase-Type Plasminogen Activator / Q000235:genetics*; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics
D017931:DNA Primers; D042461:Vascular Endothelial Growth Factor A; D017228:Hepatocyte Growth Factor; D003094:Collagen; D014568:Urokinase-Type Plasminogen Activator; D020782:Matrix Metalloproteinases