Abstract:
:To evaluate the regulation of endothelial cell Cu,Zn-SOD, we have exposed bovine pulmonary artery endothelial cells in culture to hyperoxia and hypoxia, second messengers or related agonists, hormones, free radical generating systems, endotoxin, and cytokines and have measured Cu,Zn-SOD protein of these cells by an ELISA developed in our laboratory. Control preconfluent and confluent cells in room air contained 196 +/- 18 ng Cu,Zn-SOD/10(6) cells. A23187 (0.33 microM), forskolin (10 microM), isobutylmethylxanthine (0.1 mM), dexamethasone (1 microM), triiodothyronine (1 microM) and retinoic acid (1 microM) failed to alter this level of Cu,Zn-SOD. Exposure to anoxia and hyperoxia both elevated the level approximately 1.5-2.0-fold over 20% oxygen-exposed controls at 48-72 hr. Similarly, exposures to glucose oxidase (0.0075 units/ml), menadione (12.5 microM), xanthine-xanthine oxidase (10 microM, 0.03 units/ml) and H2O2 (0.0005%) increased the level up to two-threefold over controls at 24-48 hr. Lipopolysaccharide, TGF beta 1, TNF alpha, and Il-1 also increased levels of cellular Cu,Zn-SOD, but only in proliferating cells. Il-2, Il-4, interferon-gamma, and GM-CSF had no effect on Cu,Zn-SOD. All treatments that elevated SOD resulted in inhibition of cellular growth, but decreased growth of cells at confluence alone was not associated with increased Cu,Zn-SOD. We propose from these studies that Cu,Zn-SOD of endothelial cells is not under conventional second messenger or hormonal regulation, but that up-regulation of the enzyme is associated with (and perhaps stimulated by) free-radical or oxidant production that also may be influenced by availability of certain cytokines under replicating conditions.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Kong XJ,Fanburg BLdoi
10.1002/jcp.1041530308keywords:
subject
Has Abstractpub_date
1992-12-01 00:00:00pages
491-7issue
3eissn
0021-9541issn
1097-4652journal_volume
153pub_type
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