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Endothelin inhibits cholangiocarcinoma growth by a decrease in the vascular endothelial growth factor expression.

Giammarco Fava¹, Sharon Demorrow, Eugenio Gaudio

¹Department of Gastroenterology, Universita' Politecnica delle Marche, Ancona, Italy.

Liver International : Official Journal of the International Association for the Study of the Liver

|March 18, 2009

Summary

Endothelin-1 (ET-1) inhibits cholangiocarcinoma growth by decreasing vascular endothelial growth factor (VEGF) expression. This suggests ET-1 modulation may be a therapeutic strategy for cholangiocarcinoma.

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Area of Science:

Oncology
Molecular Biology
Cell Biology

Background:

Endothelins (ETs) are vasoactive peptides interacting with ET(A) and ET(B) receptors.
ET-1 inhibits ductal secretion in cholestatic rats via ET receptors.

Purpose of the Study:

Evaluate ET-1's effect on cholangiocarcinoma growth in vitro and in vivo.
Determine if ET-1 affects expression of VEGF-A, VEGF-C, VEGFR-2, and VEGFR-3.

Main Methods:

Assessed ET receptor expression on normal/malignant cholangiocytes and human cholangiocarcinoma.
Studied ET-1's impact on Mz-ChA-1 cell proliferation and VEGF family expression.
Injected Mz-ChA-1 cells into nude mice, administering daily ET-1 or saline to assess tumor growth, proliferation, apoptosis, and collagen deposition.

Main Results:

Malignant cholangiocytes showed higher ET(A) and ET(B) receptor expression.
ET-1 inhibited Mz-ChA-1 cell proliferation and expression of VEGF-A, VEGF-C, VEGFR-2, and VEGFR-3.
In vivo, ET-1 reduced tumor volume, proliferation, and VEGF expression, while increasing apoptosis and collagen deposition.

Conclusions:

ET-1 influences cholangiocarcinoma growth by modulating VEGF-A and VEGF-C.
Targeting ET-1 may offer a therapeutic approach for cholangiocarcinoma management.