Abstract
The maximum rates (V max) of some enzymatic activities related to energy consumption (ATP-ases) were evaluated in two types of synaptic plasma membranes (SPM) isolated from cerebral cortex of rats subjected to in vivo treatment with l-acetylcarnitine at two different doses (30 and 60 mg kg−1 i.p., 28 days, 5 days/week). The following enzyme activities were evaluated: acetylcholinesterase (AChE); Na+, K+, Mg2+-ATP-ase; ouabain insensitive Mg2+-ATP-ase; Na+, K+-ATP-ase; direct Mg2+-ATP-ase; Ca2+, Mg2+-ATP-ase; Low- and High-affinity Ca2+-ATP-ase. Sub-chronic treatment with l-acetylcarnitine increased Na+, K+-ATP-ase activity on SPM 2 and Ca2+, Mg2+-ATP-ase activity on both SPM fractions. These results suggest (1) that the sensitivity to drug treatment is different between the two populations of SPM, confirming the micro-heterogeneity of these sub-fractions, probably originating from different types of synapses, (2) the specificity of the molecular site of action of the drug on SPM and (3) its interference on ion homeostasis at synaptic level.
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This work was supported by grants from Italian Ministry of University and Technological and Scientific Research (M.U.R.S.T.) and partially by Sigma-Tau, Rome.
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Villa, R.F., Ferrari, F. & Gorini, A. Effect of In Vivo l-Acetylcarnitine Administration on ATP-ases Enzyme Systems of Synaptic Plasma Membranes from Rat Cerebral Cortex. Neurochem Res 36, 1372–1382 (2011). https://doi.org/10.1007/s11064-011-0462-x
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DOI: https://doi.org/10.1007/s11064-011-0462-x