British Medical Bulletin 49:621-629 (1993)
© 1993 The British Council
research-article |
Involvement of reactive oxygen species in kidney damage
INSERM U.64, Hôpital Tenon Paris, France
Abstract
There is considerable evidence suggesting that reactive oxygen species (ROS) are implicated in the pathogenesis of ischemic, toxic, and immunologically-mediated renal injury. In experimental renal ischemia, ROS sources include the electron transport chain, oxidant enzymes (xanthine oxidase), phagocytes, and auto-oxidation of epinephrine. ROS cause lipid peroxidation of cell and organelle membranes and, hence, disruption of the structural integrity and capacity for cell transport and energy production, especially in the proximal tubule segment. In experimental immune glomerulonephritis, ROS are generated by both infiltrating blood-bome cells (polymorphonuclear leukocytes and monocytes) and resident glomerular cells, mainly mesangial cells. Their formation results in morphologic lesions and in modifications of glomerular permeability to proteins through activation of proteases and reduction of proteoglycan synthesis. Additionally, they promote a reduction in glomerular blood flow and glomerular filtration rate through liberation of vasoconstrictory bioadive lipids (prostaglandins, thromboxane, and platelet activating factor) and, possibly, inactivation of relaxing nitric oxide. Further studies are needed to address the role of ROS in human glomerular diseases.
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