Orchid Der

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The metabolism of arachidonate in brain membrane phosphoglycerides was investigated in vivo by intracerebral injection of labeled arachidonate and by in vitro assay of enzymic systems associated with the metabolism. After intracerebral injection, labeled arachidonate was incorporated rapidly into brain phosphoglycerides with radioactivity distributed mainly(More)
Incubation of synaptosomes together with 1-acyl-2-[14C]arachidonoyl-sn-glycerophosphoinositols (GPI) and sodium deoxycholate yielded diacylglycerols and free arachidonic acid. Diacylglycerol formation is attributed to hydrolysis by the diacyl-GPI-specific phospholipase C (EC 3.1.4.10), and this reaction requires sodium deoxycholate for optimal activity. The(More)
1. Substantial differences were found in the acyl donor and lyso-acceptor specificities among subcellular membranes and with respect to different regions of the adrenal gland. 2. In the presence of Mg2+-ATP and CoASH, adrenal microsomes were actively transferring arachidonate to lysophospholipids with acyl acceptor specificity in the order: 1-acyl-GPI(More)
Culture-grown astrocytes derived from 3-day-old rat brain were incubated in the presence of [3H]guanosine and of the convulsant agentl-methionine-dl-sulfoximine (MSO). The resulting [3H]tRNA was purified from control and MSO-exposed cells at several time points during the incubation and was hydrolyzed to [3H]guanine and four [3H]methyl guanines which were(More)
The biosynthesis of tRNA was investigated in cultured astroglial cells and the 3-day-old rat brain in vivo. In the culture system astrocytes were grown for 19 days and were then exposed to [3H]guanosine for 1.5-7.5 h; 3-day-old rats were injected with [3H]guanosine and were killed 5-45 min later. [3H]tRNA was extracted, partially purified, and hydrolyzed to(More)
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