Abstract:
:A clone of murine neuroblastoma (N1E-115) was shown to have functional receptors for the nonapeptide bradykinin. These receptors mediated a large, rapid (about 1 min to peak) and calcium-dependent increase in cyclic GMP. The median effective concentration (EC50) averaged 1.4 nM. In addition, this event was inhibited by quinacrine, 5,8,11,14-eicosatetraynoic acid, and nordi-hydroguaiaretic acid, suggesting involvement of phospholipase A2 with subsequent formation of lipoxygenase metabolities of arachidonic acid. [3H]Bradykinin binding to intact cells, investigated under conditions nearly identical to those used in the cyclic GMP assay, yielded binding sites with KDS of 0.83 pM, 1.0 nM, and 4.9 nM with respective Bmax values of 12, 160, and 250 fmol/10(6) cells. Apparently, the cyclic GMP response was associated with the binding site in which the KD = 1.0 nM. Peptide analogs of bradykinin stimulated cyclic GMP with EC50S nearly identical to their respective KDS determined in binding assays with [3H]bradykinin, thus providing evidence for receptor specificity of this response. This finding of a biochemical response of bradykinin promises to make N1E-115 cells a convenient model system for study of neuronal bradykinin receptors.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Snider RM,Richelson Edoi
10.1111/j.1471-4159.1984.tb06104.xsubject
Has Abstractpub_date
1984-12-01 00:00:00pages
1749-54issue
6eissn
0022-3042issn
1471-4159journal_volume
43pub_type
杂志文章abstract::A procedure is described for the rapid preparation of nerve ending particles (synaptosomes) from 11 regions of one rat brain. The synaptosomal fractions have been characterized by electron microscopy and determination of four marker enzymes, i.e., glutamate decarboxylase (GAD), acetylcholinesterase, succinate dehydrog...
journal_title:Journal of neurochemistry
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