[The role of hepatic sinusoid capillarization during the formation of portal hypertension in fibrotic rats induced by dimethylnitrosamine].
OBJECTIVE
To study the role of hepatic sinusoid capillarization during the formation of portal hypertension in fibrotic rats induced by dimethylnitrosamine (DMN).


METHODS
Hepatic fibrotic rats were induced by administration of DMN intraperitoneally three times a week for 4 weeks. The rats were harvested on day 2 and weeks 1, 2, 3, 4, 5, 6, 8, 12 and 24. The formation of liver fibrosis and hepatic sinusoid capillarization were observed by morphologic methods. Pressure of portal vein (Ppv) was directed measured with intubation tube method by mesentry anterior vein.


RESULTS
The Ppv was getting higher and higher with the administration of DMN. After four weeks, the Ppv was higher than that of control [(1.10+/-0.18)kPa vs (0.52+/-0.04)kPa, t=6.41, P<0.01]. The dynamic change of hepatic sinusoid capillarization was in accordance with that of Ppv, which normalized gradually after the DMN was stopped. Significant positive correlation existed between the dynamic change of Ppv and the expression of vWF, laminin and alpha-SMA in sinus (r=0.833, P<0.01; r=0.953, P<0.01; r=0.919, P<0.01).


CONCLUSIONS
Hepatic sinusoid capillarization is the vital cause for portal hypertension in fibrotic rats induced by DMN.
Department of Pathology, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.
Xiong
X
Lu
Ping
P
Liu
Guang-fu
GF
Xu
Cheng-hai
CH
Liu
Feng-hua
FH
Li
Cheng
C
Liu
D000818:Animals; D002196:Capillaries / Q000473:pathology; D004128:Dimethylnitrosamine; D006975:Hypertension, Portal / Q000139:chemically induced / Q000209:etiology / Q000473:pathology*; D008099:Liver / Q000098:blood supply / Q000473:pathology*; D008106:Liver Cirrhosis, Experimental / Q000139:chemically induced / Q000150:complications / Q000473:pathology*; D008297:Male; D051381:Rats; D017208:Rats, Wistar
D004128:Dimethylnitrosamine