Effect of vascular endothelial growth factor on hepatic regenerative activity following partial hepatectomy in rats.
OBJECTIVE
Vascular endothelial growth factor (VEGF) is an angiogenic factor with a growth-promoting effect that is thought to be restricted to vascular endothelial cells. Its essential role during liver regeneration has yet to be determined. The aim of this study was to document the effect of exogenous VEGF administration on liver regeneration in rats undergoing submaximal hepatic resections.


METHODS
Adult male Sprague-Dawley rats (n = 4/group) undergoing 30% partial hepatectomy were administered 200 ng VEGF165 intravenously and were sacrificed at 24, 36, and 48 h postoperatively. Liver regeneration was monitored by measuring the restituted liver mass, proliferating cell nuclear antigen (PCNA) immunostaining, and hepatic PCNA protein by Western blot.


RESULTS
Changes in restituted liver mass 48 h postsurgery were more prominent, but did not differ statistically between VEGF-treated and control rats (47% vs. 29%; p<0.06). Nevertheless, PCNA immunostaining showed increased labeling index of hepatocytes, apparent at 36 and 48 h after partial hepatectomy (38% vs. 18% [p<0.041 and 42% vs. 11% [p<0.021], respectively). Hepatic PCNA proteins measured by Western blot showed a 3-fold increase in VEGF-treated rats 48 h postsurgery compared with controls (p<0.01).


CONCLUSIONS
Exogenous VEGF administration early after partial hepatectomy stimulates liver regeneration in rats. Whether or not VEGF165 is a direct mitogen for hepatocytes remains to be determined.
Assy
N
N
Department of Medicine B, Rambam Medical Center, Haifa, Israel.
Spira
G
G
Paizi
M
M
Shenkar
L
L
Kraizer
Y
Y
Cohen
T
T
Neufeld
G
G
Dabbah
B
B
Enat
R
R
Baruch
Y
Y
D000818:Animals; D016228:Endothelial Growth Factors / Q000494:pharmacology*; D006498:Hepatectomy; D007275:Injections, Intravenous; D008099:Liver / Q000166:cytology* / Q000187:drug effects / Q000502:physiology*; D008115:Liver Regeneration / Q000187:drug effects*; D008222:Lymphokines / Q000494:pharmacology*; D008297:Male; D008940:Mitotic Index; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors
D016228:Endothelial Growth Factors; D008222:Lymphokines; D018809:Proliferating Cell Nuclear Antigen; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors