Abstract:
:Nitric oxide (.NO) is a freely diffusible inter- and intracellular messenger produced by a variety of mammalian cells including vascular endothelium, neurons, smooth muscle cells, macrophages, neutrophils, platelets, and pulmonary epithelium. In smooth muscle cells, platelets, and neutrophils, .NO raises intracellular cyclic guanasine 5'-monophosphate levels by reacting with the catalytic heme domain of guanylate cylase, to activate it, thus leading to vasorelaxation, inhibition of platelet aggregation and inhibition of platelet and inflammatory cell adhesion to endothelium. The physiologic actions of .NO are highly dependent on changes in steady-state concentrations of reactive species and tissue-oxidant defense mechanisms. Vessel wall oxidases and oxygenases, in particular, are critical sources of oxygen radical production and can lead to an overall impairment of vascular .NO signaling, via the metalloprotein and free radical-mediated consumption of this vasoactive molecule. Vascular oxidase and oxygenase activities can thus account for the functional inactivation of .NO, leading to a prooxidative milieu and chronic inflammation.
journal_name
Immunol Resjournal_title
Immunologic researchauthors
Aslan M,Freeman BAdoi
10.1385/IR:26:1-3:107subject
Has Abstractpub_date
2002-01-01 00:00:00pages
107-18issue
1-3eissn
0257-277Xissn
1559-0755pii
IR:26:1-3:107journal_volume
26pub_type
杂志文章,评审abstract::The MHC class II antigen processing pathway provides a mechanism to selectively present peptides generated in the endosomal compartments of antigen presenting cells to CD4+ T cells. Transport of newly synthesized class II molecules to the endosomal pathway requires the function of an accessory protein, invariant chain...
journal_title:Immunologic research
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