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Semin Thromb Hemost 2002; 28(6): 545-554
DOI: 10.1055/s-2002-36699
Copyright © 2002 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4662

Increased Expression of Plasminogen Activator Inhibitor-1 with Fibrin Deposition in a Murine Model of Aging, "Klotho" Mouse

Kyosuke Takeshita1 , Koji Yamamoto1 , Masafumi Ito2 , Takahisa Kondo1 , Tadashi Matsushita1 , Makoto Hirai1 , Tetsuhito Kojima3 , Masahiko Nishimura4 , Yoichi Nabeshima5 , David J. Loskutoff6 , Hidehiko Saito7 , Toyoaki Murohara1
  • 1First Department of Internal Medicine, Nagoya University School of Medicine, Nagoya
  • 2Department of Pathology, Nagoya University Hospital, Nagoya
  • 3Department of Medical Technology, Nagoya University School of Health Sciences, Nagoya
  • 4Institute for Laboratory Animal Research, Nagoya University School of Medicine, Nagoya
  • 5Department of Pathology and Tumor Biology, Kyoto University Graduate School of Medicine, Kyoto, Japan
  • 6Department of Vascular Biology (VB-3), The Scripps Research Institute, La Jolla, California
  • 7Nagoya National Hospital, Nagoya, Japan
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Publication History

Publication Date:
21 January 2003 (online)

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ABSTRACT

Although aging accompanies specific pathological changes, including thrombosis and organ sclerosis, the underlying mechanisms of these processes remain to be elucidated. In the present study, we analyzed the gene expression of plasminogen activator inhibitor-1 (PAI-1), a key molecule in the development of thrombosis, in a murine model of aging, klotho mutant (kl/kl) mice. Active PAI-1 antigen in plasma and PAI-1 mRNA in several tissues were strikingly elevated in kl/kl mice as compared with wild-type mice. This increased PAI-1 expression was age dependent and linked to the development of ectopic calcification and glomerular fibrin deposition in the kidneys. In situ hybridization analysis of kl/kl mice demonstrated that strong signals for PAI-1 mRNA were localized in renal tubular epithelial cells, cardiomyocytes, adrenal medullar cells, and smooth muscle and endothelial cells in Mönckeberg's arteriosclerotic vessels. Renal glomerular fibrin deposition, as evaluated immunohistochemically, was occasionally observed only in kl/kl mice, and the number of fibrin-positive glomeruli increased as the kl/kl mice aged. These observations suggest that in the process of aging the PAI-1 gene expression is increased, contributing to the development of thrombosis.

KEYWORD

Thrombosis - fibrinolysis - proteolysis - gene expression - sclerosis

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