Abstract：
:Many neurotransmitters and hormones activate receptors that are known to be coupled to their effectors by GTP-binding regulatory proteins, G proteins. Activation of many of these same receptors elicits arachidonate release and metabolism. During the past few years, novel experimental techniques have revealed that in many cells arachidonate release is independent of generation of other second messengers, including inositol phosphates, diacylglycerols, and elevation in free intracellular calcium. Much evidence has accumulated to implicate phospholipase A2 as the enzyme catalyzing arachidonate release, and suggesting that this effector enzyme, too, is activated by G proteins. In neural tissues as well as epithelium, endothelium, contractile and connective tissues, and blood cells, G proteins coupled to receptors for a variety of peptide and nonpeptide neurotransmitters and hormones have been shown to directly activate phospholipase A2. In retinal rod outer segments, transducin is the coupling G protein, but the G proteins coupling receptor activation to phospholipase A2 in other cell types is less clear. Some are pertussis toxin-sensitive, whereas others are not, and evidence exists that the ras gene product G protein may also be coupled to and regulate phospholipase A2.
journal_name
Mol Neurobioljournal_title
Molecular neurobiologyauthors
Burch RMdoi
10.1007/BF02935629subject
Has Abstractpub_date
1989-10-01 00:00:00pages
155-71issue
3eissn
0893-7648issn
1559-1182journal_volume
3pub_type
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