Hepatic
cirrhosis is considered a severe health problem in Mexico, since it is the third mortality cause in working-age people and there is no 100%
effective treatment.
Cirrhosis is characterized by an exacerbated increase of collagen in
liver parenchyma, replacing the hepatocytes and thus provoking
liver failure. This is one of the reasons why we have used a
gene therapy through specific delivery to cirrhotic livers of the
gene of human
urokinase plasminogen activator (huPA), which activates mechanisms that induce the degradation of excess cellular matrix and stimulate
hepatocyte proliferation, obtaining thus a fast re-establishment of the
liver function. In the instant invention, the modified human uPA
gene was inserted in the adenoviral vector (pAd-DeltahuPA), because it is not secreted and does not provoke hypercoagulation or spontaneous internal bleedings. Moreover, data from the bio-distribution essay with an adenoviral vector with
reporter gene beta-gal have shown liver specificity as the
target organ of the vector. Using ELISA, huPa
protein was detected in liver homogenates (4500 pg / ml) in animals treated with pAd-DeltahuPA and was also intracellularly detected through
immunochemistry in liver cuts (80% positive cells). huPa induced a dramatic
fibrosis reduction (85%) on day 10 of vector administration, compared to control cirrhotic rats and 55%
hepatocyte proliferation increase.
Liver function tests (ALT, AST,
alkaline phosphatase and
bilirubin) dropped to nearly normal levels and
hepatocyte proliferation was observed. Because of the two beneficial event cascades, gene therapy with modified huPA can be developed as a definite potential treatment for patients with liver
cirrhosis.