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From the Division of Cardiology, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY.
Correspondence to LeRoy E. Rabbani, MD, Division of Cardiology, Department of Medicine, Columbia University College of Physicians and Surgeons, 630 West 168th St, New York, NY 10032.
Abstract Platelet-derived growth factor
(PDGF)induced smooth muscle cell (SMC) fibrinolysis
is necessary for SMC migration. In order to determine whether the
T-cell lymphokines interleukin-4 (IL-4) and gamma interferon (
-IFN)
affect SMC fibrinolysis and migration, we examined the
effects of human recombinant IL-4 and
-IFN on human aortic SMC
tissue-type plasminogen activator (TPA),
urokinase-type plasminogen activator (UPA),
and plasminogen activator inhibitor
type-1 (PAI-1) antigen production, as determined by
enzyme-linked immunosorbent assays. Although IL-4 had no direct
effect on SMC TPA antigen, IL-4 potentiated SMC TPA antigen levels and
activity in conditioned media and cellular lysates in media containing
2% fetal bovine serum but did not change UPA or PAI-1
production.
-IFN attenuated IL-4 augmentation of SMC TPA
antigen production in conditioned media, although
-IFN
itself had no direct effects on SMC TPA and PAI-1 antigen
production. IL-4 augmented PDGF induction of SMC TPA antigen.
-IFN inhibited PDGF induction of SMC TPA antigen and IL-4
potentiation of this process.
-IFN diminished the promigratory
effects of both IL-4 and PDGF on in vitro SMC migration. Tranexamic
acid, a plasmin inhibitor, abrogated the stimulation of SMC
migration by IL-4. Therefore, IL-4 and
-IFN modulate the induction
of SMC TPA and SMC migration by 2% fetal bovine serum and PDGF.
Key Words: interleukin-4 fibrinolysis gamma interferon platelet-derived growth factor smooth muscle cells
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