Nitric oxide facilitates delivery and mediates improved outcome of autologous bone marrow mononuclear cells in a rodent stroke model

Bone marrow mononuclear cells (MNC) represent an investigational treatment for stroke. The objective of this study was to determine the relevance of vasoactive mediators, generated in response to MNC injection, as factors regulating cerebral perfusion (CP), the biodistribution of MNC, and outcome in...

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Veröffentlicht in:PloS one 2012-03, Vol.7 (3), p.e32793-e32793
Hauptverfasser: Kasam, Mallikarjunarao, Yang, Bing, Strong, Roger, Schaar, Krystal, Misra, Vivek, Xi, Xiaopei, Grotta, James C, Aronowski, Jaroslaw, Savitz, Sean I
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container_title PloS one
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creator Kasam, Mallikarjunarao
Yang, Bing
Strong, Roger
Schaar, Krystal
Misra, Vivek
Xi, Xiaopei
Grotta, James C
Aronowski, Jaroslaw
Savitz, Sean I
description Bone marrow mononuclear cells (MNC) represent an investigational treatment for stroke. The objective of this study was to determine the relevance of vasoactive mediators, generated in response to MNC injection, as factors regulating cerebral perfusion (CP), the biodistribution of MNC, and outcome in stroke. Long Evans rats underwent transient middle cerebral artery occlusion. MNC were extracted from the bone marrow at 22 hrs and injected via the internal carotid artery or the femoral vein 2 hours later. CP was measured with MRI or continuous laser Doppler flowmetry. Serum samples were collected to measure vasoactive mediators. Animals were treated with the Nitric Oxide (NO) inhibitor, L-NAME, to establish the relevance of NO-signaling to the effect of MNC. Lesion size, MNC biodistribution, and neurological deficits were assessed. CP transiently increased in the peri-infarct region within 30 min after injecting MNC compared to saline or fibroblast control. This CP increase corresponded temporarily to serum NO elevation and was abolished by L-NAME. Pre-treatment with L-NAME reduced brain penetration of MNC and prevented MNC from reducing infarct lesion size and neurological deficits. NO generation in response to MNC may represent a mechanism underlying how MNC enter the brain, reduce lesion size, and improve outcome in ischemic stroke.
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The objective of this study was to determine the relevance of vasoactive mediators, generated in response to MNC injection, as factors regulating cerebral perfusion (CP), the biodistribution of MNC, and outcome in stroke. Long Evans rats underwent transient middle cerebral artery occlusion. MNC were extracted from the bone marrow at 22 hrs and injected via the internal carotid artery or the femoral vein 2 hours later. CP was measured with MRI or continuous laser Doppler flowmetry. Serum samples were collected to measure vasoactive mediators. Animals were treated with the Nitric Oxide (NO) inhibitor, L-NAME, to establish the relevance of NO-signaling to the effect of MNC. Lesion size, MNC biodistribution, and neurological deficits were assessed. CP transiently increased in the peri-infarct region within 30 min after injecting MNC compared to saline or fibroblast control. This CP increase corresponded temporarily to serum NO elevation and was abolished by L-NAME. Pre-treatment with L-NAME reduced brain penetration of MNC and prevented MNC from reducing infarct lesion size and neurological deficits. NO generation in response to MNC may represent a mechanism underlying how MNC enter the brain, reduce lesion size, and improve outcome in ischemic stroke.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>22412926</pmid><doi>10.1371/journal.pone.0032793</doi><tpages>e32793</tpages><oa>free_for_read</oa></addata></record>
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subjects Animals
Autografts
Biology
Bone marrow
Bone Marrow Transplantation
Brain
Brain damage
Cardiomyocytes
Carotid arteries
Carotid artery
Cerebral blood flow
Cerebrovascular Circulation - drug effects
Cytokines
Disease Models, Animal
Doppler effect
Enzyme Inhibitors - pharmacology
Femur
Fibroblasts
Hypoxia
Ischemia
Lasers
Leukocytes (mononuclear)
Ligands
Magnetic resonance imaging
Male
Medical schools
Medicine
Middle age
Neurological diseases
Neurology
NG-Nitroarginine methyl ester
NG-Nitroarginine Methyl Ester - pharmacology
Nitric oxide
Nitric Oxide - blood
Nitric Oxide - metabolism
Nitric Oxide Synthase - antagonists & inhibitors
Occlusion
Patient outcomes
Perfusion
Rats
Rodents
Signaling
Stem cells
Stroke
Stroke - mortality
Stroke - therapy
Time Factors
Transplantation, Autologous
Treatment Outcome
Vasoactive agents
Veins
Veins & arteries
title Nitric oxide facilitates delivery and mediates improved outcome of autologous bone marrow mononuclear cells in a rodent stroke model
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