PMID- 17204092 OWN - NLM STAT- MEDLINE DCOM- 20070330 LR - 20181113 IS - 0914-7470 (Print) IS - 0914-7470 (Linking) VI - 19 IP - 3 DP - 2006 Aug TI - Expression of hepatocyte growth factor activator inhibitor type 1 in endothelial cells. PG - 91-7 AB - Hepatocyte growth factor activator inhibitor type 1 (HAI-1) is an integral membrane Kunitz-type serine proteinase inhibitor initially identified as a potent inhibitor of hepatocyte growth factor activator (HGFA). HGFA is a serum proteinase that is critically involved in the activation of hepatocyte growth factor/scatter factor (HGF/SF) in injured tissue. Previous studies have shown that HAI-1 is expressed on the basolateral surface of various epithelial cells. In this study, we analyzed the expression of HAI-1 in human endothelial cells. Immunohistochemically, HAI-1 protein was observed in the endothelial cells of capillaries, venules and lymph vessels. On the other hand, arterial endothelial cells were poorly stained for HAI-1. Mesothelial cells on the serous surface were also positively immunostained. The endothelial expression of HAI-1 was also examined in cultured human endothelial cells of various origins, such as umbilical vein, microvessels and aorta. Notably, in accordance with the results of immunohistochemistry, HAI-1 mRNA and protein levels were high in the endothelial cells derived from umbilical vein and were hardly detectable in those derived from aorta. A low but distinct level of HAI-1 expression was also observed in endothelial cells from microvessels. As these HAI-1-positive endothelial cells also expressed MET tyrosine kinase, the specific receptor of HGF/SF, it is conceivable that HAI-1 might have an important regulatory role in the HGF/SF-MET signaling axis of endothelial cells, which could be involved in the process of angiogenesis. FAU - Akiyama, Yutaka AU - Akiyama Y AD - Section of Oncopathology and Regenerative Biology, Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan. FAU - Nagai, Miyuki AU - Nagai M FAU - Komaki, Wataru AU - Komaki W FAU - Marutsuka, Kousuke AU - Marutsuka K FAU - Asada, Yujiro AU - Asada Y FAU - Kataoka, Hiroaki AU - Kataoka H LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Japan TA - Hum Cell JT - Human cell JID - 8912329 RN - 0 (Membrane Glycoproteins) RN - 0 (Proteinase Inhibitory Proteins, Secretory) RN - 0 (Proto-Oncogene Proteins) RN - 0 (RNA, Messenger) RN - 0 (Receptors, Growth Factor) RN - 0 (SPINT1 protein, human) RN - 67256-21-7 (Hepatocyte Growth Factor) RN - EC 2.7.10.1 (MET protein, human) RN - EC 2.7.10.1 (Proto-Oncogene Proteins c-met) SB - IM MH - Cells, Cultured MH - Endothelial Cells/*enzymology MH - Hepatocyte Growth Factor/metabolism/physiology MH - Humans MH - Immunohistochemistry MH - Membrane Glycoproteins/genetics/*metabolism MH - Neovascularization, Pathologic/genetics MH - Proteinase Inhibitory Proteins, Secretory MH - Proto-Oncogene Proteins/metabolism MH - Proto-Oncogene Proteins c-met MH - RNA, Messenger/metabolism MH - Receptors, Growth Factor/metabolism MH - Reverse Transcriptase Polymerase Chain Reaction MH - Signal Transduction EDAT- 2007/01/06 09:00 MHDA- 2007/03/31 09:00 CRDT- 2007/01/06 09:00 PHST- 2007/01/06 09:00 [pubmed] PHST- 2007/03/31 09:00 [medline] PHST- 2007/01/06 09:00 [entrez] AID - HUC015 [pii] AID - 10.1111/j.1749-0774.2006.00015.x [doi] PST - ppublish SO - Hum Cell. 2006 Aug;19(3):91-7. doi: 10.1111/j.1749-0774.2006.00015.x.