Granulocyte-macrophage colony-stimulating factor-induced arteriogenesis reduces energy failure in hemodynamic stroke.
Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a powerful arteriogenic factor in the hypoperfused rat brain. To test the pathophysiological relevance of this response, the influence of GM-CSF on brain energy state was investigated in a model of hemodynamic stroke. Sprague-Dawley rats were submitted to three-vessel (bilateral vertebral and unilateral common carotid artery) occlusion (3-VO) to induce unilaterally accentuated brain hypoperfusion. One week later, hemodynamic stroke was induced by additional lowering of arterial blood pressure. Experiments were terminated by in situ freezing of the brain. ATP was measured in cryostat sections by using a bioluminescence method. The use of 3-VO, in combination with 15 min of hypotension of 50, 40, or 30 mmHg, did not produce disturbances of energy metabolism, however, focal areas of ATP depletion were unilaterally detected after 3-VO, in combination with 15 min of hypotension of 20 mmHg. Treating such animals with GM-CSF (40 microg.kg(-1).d(-1)) during the 1-week interval between 3-VO and induced hypotension significantly reduced the hemispheric volume of energy depletion from 48.8 +/- 44.2% (untreated group, n = 10) to 15.8 +/- 17.4% (treated group, n = 8, P = 0.033). GM-CSF-induced arteriogenesis is another approach to protect the brain against ischemic injury.
Schneeloch
Edda
E
Department of Experimental Neurology, Max Planck Institute for Neurological Research, Gleueler Strasse 50, 50931 Cologne, Germany.
Mies
Günter
G
Busch
Hans-Jörg
HJ
Buschmann
Ivo R
IR
Hossmann
Konstantin-Alexander
KA
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002560:Cerebrovascular Circulation; D004734:Energy Metabolism; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism*; D006439:Hemodynamics; D007022:Hypotension; D017078:Laser-Doppler Flowmetry; D008297:Male; D018919:Neovascularization, Physiologic; D051381:Rats; D017207:Rats, Sprague-Dawley; D012039:Regional Blood Flow; D020521:Stroke / Q000378:metabolism* / Q000473:pathology
D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D000255:Adenosine Triphosphate