Abstract:
:During the last decade, a multitude of experimental arguments have led to the concept that EDRF is nitric oxide (NO), a messenger not only involved in the control of vasomotor tone but also in vascular homeostasis, neuronal and immunological functions. Regardless of its origin, endogenous NO is produced through the conversion of L-arginine to L-citrulline by NO-synthase (NOS) from which several isoforms have recently been isolated, purified and cloned. NOS-type I (isolated from brain) and type III (isolated from endothelial cells) are termed "constitutive-NOS" and produce picomolar levels of NO from which only a small fraction elicits physiological responses. These isoforms are regulated by Ca(2+)-calmodulin with NADPH, FAD/FMN and tetrahydrobiopterin as co-factors and reveal a high degree of homology with the amino-acid sequence of cytochrome P450 reductase within the C-terminal domain. Functionally, neuronal-NOS type I is important in neurotransmission (modulation of NMDA receptor), the central control of vascular homeostasis and possibly learning and memory. In the peripheral nervous system, NOS appears to be linked to nonadrenergic noncholinergic (NANC) neuronal pathways. Endothelial-NOS type III is essential for the control of vascular tone in response to the release of endogenous mediators, although shear stress is the major trigger of endothelial-NOS activity under physiological conditions. NOS-type III also contributes to the prevention of abnormal platelet aggregation. NOS-types II and IV (isolated from macrophages) are Ca(2+)-calmodulin independent and are termed "inducible-NOS" since their activation is only promoted under pathophysiological situations where macrophages exert cytotoxic effects in response to cytokines. In contrast with NOS-types I and III, activation of NOS-type II in these cells induces the formation of nanomolar levels of NO which act as a defense mechanism of the immune system. Dysfunctions of the L-arginine-NO pathway have been characterized in multiple diseases (atherosclerosis, hypertension, diabetes, sepsis, cerebral ischemia, etc) and the design of more selective activators/inhibitors of NOS isoforms is a new challenge for the understanding of their pathophysiology and treatment.
journal_name
Fundam Clin Pharmacoljournal_title
Fundamental & clinical pharmacologyauthors
Berdeaux Adoi
10.1111/j.1472-8206.1993.tb01037.xsubject
Has Abstractpub_date
1993-01-01 00:00:00pages
401-11issue
8eissn
0767-3981issn
1472-8206journal_volume
7pub_type
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journal_title:Fundamental & clinical pharmacology
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journal_title:Fundamental & clinical pharmacology
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journal_title:Fundamental & clinical pharmacology
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