Abstract
Ischemic stroke causes cell necrosis with the exposure of extracellular ribonucleic acid (RNA) and other intracellular material. As shown recently, extracellular RNA impaired the blood-brain-barrier and contributed to vasogenic edema-formation. Application of ribonuclease 1 (RNase 1) diminished edema-formation and also reduced lesion volume in experimental stroke. Here we investigate whether reduction of lesion volume is due to the reduction of edema or of other neuroprotective means. Neuroprotective and edema protective effects of RNase 1 pretreatment were assessed using a temporary middle cerebral artery occlusion (MCAO) model in rats. Lesion volume was assessed on magnetic resonance imaging (MRI). T2- relaxation-time and midline-shift as well as brain water content (wet-dry-method) were measured to quantify edema formation. The impact of edema formation on infarct volume was evaluated in craniectomized animals. Exogenous RNase 1 was well tolerated and reduced edema-formation and infarct size (26.7% ± 10.7% vs. 41.0% ± 10.3%; p < 0.01) at an optimal dose of 42 μg/kg as compared to placebo. Craniectomized animals displayed a comparable edema reduction but no reduction in infarct size. The present study introduces a hitherto unrecognized mechanism of ischemic brain damage and a novel neuroprotective approach towards acute stroke treatment.
Keywords: Acute stroke, edema, RNase, neuroprotection, craniectomy
Current Neurovascular Research
Title: RNase Therapy Assessed by Magnetic Resonance Imaging Reduces Cerebral Edema and Infarction Size in Acute Stroke
Volume: 6 Issue: 1
Author(s): Maureen Walberer, Marlene Tschernatsch, Silvia Fischer, Nouha Ritschel, Kai Volk, Carolin Friedrich, Georg Bachmann, Clemens Mueller, Manfred Kaps, Max Nedelmann, Franz Blaes, Klaus T. Preissner and Tibo Gerriets
Affiliation:
Keywords: Acute stroke, edema, RNase, neuroprotection, craniectomy
Abstract: Ischemic stroke causes cell necrosis with the exposure of extracellular ribonucleic acid (RNA) and other intracellular material. As shown recently, extracellular RNA impaired the blood-brain-barrier and contributed to vasogenic edema-formation. Application of ribonuclease 1 (RNase 1) diminished edema-formation and also reduced lesion volume in experimental stroke. Here we investigate whether reduction of lesion volume is due to the reduction of edema or of other neuroprotective means. Neuroprotective and edema protective effects of RNase 1 pretreatment were assessed using a temporary middle cerebral artery occlusion (MCAO) model in rats. Lesion volume was assessed on magnetic resonance imaging (MRI). T2- relaxation-time and midline-shift as well as brain water content (wet-dry-method) were measured to quantify edema formation. The impact of edema formation on infarct volume was evaluated in craniectomized animals. Exogenous RNase 1 was well tolerated and reduced edema-formation and infarct size (26.7% ± 10.7% vs. 41.0% ± 10.3%; p < 0.01) at an optimal dose of 42 μg/kg as compared to placebo. Craniectomized animals displayed a comparable edema reduction but no reduction in infarct size. The present study introduces a hitherto unrecognized mechanism of ischemic brain damage and a novel neuroprotective approach towards acute stroke treatment.
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Walberer Maureen, Tschernatsch Marlene, Fischer Silvia, Ritschel Nouha, Volk Kai, Friedrich Carolin, Bachmann Georg, Mueller Clemens, Kaps Manfred, Nedelmann Max, Blaes Franz, Preissner T. Klaus and Gerriets Tibo, RNase Therapy Assessed by Magnetic Resonance Imaging Reduces Cerebral Edema and Infarction Size in Acute Stroke, Current Neurovascular Research 2009; 6 (1) . https://dx.doi.org/10.2174/156720209787466037
DOI https://dx.doi.org/10.2174/156720209787466037 |
Print ISSN 1567-2026 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5739 |
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