Alpha1-antitrypsin inhibits angiogenesis and tumor growth.
Disturbances of the ratio between angiogenic inducers and inhibitors in tumor microenvironment are the driving force behind angiogenic switch critical for tumor progression. Angiogenic inhibitors may vary depending on organismal age and the tissue of origin. We showed that alpha(1)-antitrypsin (AAT), a serine protease inhibitor (serpin) is an inhibitor of angiogenesis, which induced apoptosis and inhibited chemotaxis of endothelial cells. S- and Z-type mutations that cause abnormal folding and defective serpin activity abrogated AAT antiangiogenic activity. Removal of the C-terminal reactive site loop had no effect on its angiostatic activity. Both native AAT and AAT truncated on C-terminus (AATDelta) inhibited neovascularization in the rat cornea and delayed the growth of subcutaneous tumors in mice. Treatment with native AAT and truncated AATDelta, but not control vehicle reduced tumor microvessel density, while increasing apoptosis within tumor endothelium. Comparative analysis of the human tumors and normal tissues of origin showed correlation between reduced local alpha(1)-antitrypsin expression and more aggressive tumor growth.
Department of Urology and Robert H. Lurie Comprehensive Cancer Center, Northwestern University Medical School, Chicago, IL 60611, USA.
Hanhua
H
Huang
Steven C
SC
Campbell
Thomas
T
Nelius
Dhugal F
DF
Bedford
Dorina
D
Veliceasa
Noel P
NP
Bouck
Olga V
OV
Volpert
D020533:Angiogenesis Inhibitors / Q000378:metabolism* / Q000494:pharmacology; D000818:Animals; D000970:Antineoplastic Agents / Q000378:metabolism* / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects; D045744:Cell Line, Tumor; D002633:Chemotaxis / Q000187:drug effects; D003315:Cornea / Q000098:blood supply; D015536:Down-Regulation / Q000187:drug effects; D042783:Endothelial Cells / Q000187:drug effects* / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D008833:Microcirculation; D009374:Neoplasms, Experimental / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D015842:Serine Proteinase Inhibitors / Q000378:metabolism* / Q000494:pharmacology; D000515:alpha 1-Antitrypsin / Q000378:metabolism* / Q000494:pharmacology
D020533:Angiogenesis Inhibitors; D000970:Antineoplastic Agents; D012333:RNA, Messenger; D015842:Serine Proteinase Inhibitors; D000515:alpha 1-Antitrypsin