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Regional profiles of steady-state levels of cyclic nucleotides, cyclic AMP phosphodiesterase, and guanylate cyclase activities during late stages of unilateral ischemia in gerbil forebrain

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Abstract

The present study was an extension of earlier work regarding the role of cyclic nucleotides and related enzymes during cerebral ischemia in the gerbil. Following unilateral carotid occlusion, levels of cyclicAMP and cyclicGMP were measured in four rapidly inactivated brain regions at 3, 6, and 24 hr after permanent occlusion and at 2hr of occlusion plus 1 hr of reflow. An analysis of variance indicated significant minor fluctuations in the steady-state levels of the two cyclic nucleotides within the frontal cortex, the hippocampus, the striatum, and especially the olfactory tubercle with respect to occlusion time (3 and 24 hr) but not when comparing control vs ischemic hemispheres (except at 3hr). Changes occurred only in animals developing neurological symptoms of ischemia. At 24 hr postocclusion the specific activity of the lowK m form of cyclicAMP phosphodiesterase was elevated especially on the ischemie side when determined in homogenates of the four brain regions. Alternatively, the high-K m form of the enzyme in the presence or absence of Ca+-calmodulin was unchanged. Guanylate cyclase activity in tissue homogenates was not influenced by the conditions of ischemia until 24 hr had elapsed, an event likewise unique to symptomatic gerbils. The sensitivity of the enzyme to hematin-catalase was decreased in the ischemic hemispheres of the hippocampus, striatum, and olfactory tubercle. In addition, further activation of the hematin-catalase response by NaN3 was depressed in the ischemic side of the hippocampus and striatum. Taken together these and previous studies indicate that fluctuations in the steady-state levels of cyclic nucleotides that occur rather prominently during acute and to a lesser degree during prolonged ischemia are not correlated with associated changes in enzymes responsible for their synthesis and/or degradation.

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Authors and Affiliations

  1. Pennwalt Corporation, CV/CNS Pharmacology, 755 Jefferson Road, 14623, Rochester, New York

    G. C. Palmer, P. M. Colombo & S. J. Palmer

  2. Department of Pathology, Vanderbilt University Medical School, 37232, Nashville, Tennessee

    B. C. Christie-Pope

  3. Department of Pharmacology, University Texas Health Science Center, 7703 Floyd Curl Drive, 78284, San Antonio, Texas

    M. A. Medina

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  1. G. C. Palmer
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  2. B. C. Christie-Pope
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  3. M. A. Medina
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  4. P. M. Colombo
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  5. S. J. Palmer
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Palmer, G.C., Christie-Pope, B.C., Medina, M.A. et al. Regional profiles of steady-state levels of cyclic nucleotides, cyclic AMP phosphodiesterase, and guanylate cyclase activities during late stages of unilateral ischemia in gerbil forebrain. Metab Brain Dis 3, 161–177 (1988). https://doi.org/10.1007/BF00999233

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  • DOI: https://doi.org/10.1007/BF00999233

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