PRODUCTION OF ENDOTHELIN-1 AND THROMBOMODULIN BY HUMAN PANCREATIC-CANCER CELLS

Analysis of bioactive substances produced by cancer cells is one appro ach to understanding the biological features of human cancer. One of t hese bioactive substances is endothelin (ET)-1, a peptide with potent vasoconstrictive activity produced by vascular endothelial cells. We h ave previously reported the production of ET-1 by several types of hum an cancer, especially pancreatic cancer cells. To elucidate whether th ese cancer cells might share biological characteristics with vascular endothelial cells, we investigated the production of three ET isoforms in pancreatic cancer cells, using a specific radioimmunoassay. Furthe r, we also investigated whether these cells produce thrombomodulin (TM ), another product of endothelial cells functioning as a modulator of procoagulant activity. ET-1 was detected in 11 of 12 pancreatic cancer cell lines (92%) while ET-2 and ET-3 were detectable in only one cell line. Gel filtration analysis confirmed the presence of ET-1. Moreove r, TM was detected in the cell lysates of 11 of the 12 cell lines (92% ) and it was released into the culture medium in the majority (58%) of these cell lines. TM mRNA was also detected in these cells. In additi on, TM was demonstrated immunocytochemically along the cell surface. T hese results suggest that pancreatic cancer cells share two characteri stics with endothelial cells: the production of ET-1 and TM.