Functional recruitment of red blood cells to rat brain microcirculation accompanying increased neuronal activity in cerebellar cortex
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Functional recruitment of red blood cells to rat brain microcirculation accompanying increased neuronal activity in cerebellar cortex. / Akgören, Nuran; Lauritzen, Martin.
In: NeuroReport, Vol. 10, No. 16, 01.01.1999, p. 3257-3263.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Functional recruitment of red blood cells to rat brain microcirculation accompanying increased neuronal activity in cerebellar cortex
AU - Akgören, Nuran
AU - Lauritzen, Martin
PY - 1999/1/1
Y1 - 1999/1/1
N2 - SCANNING laser-Doppler flowmetry (SLDF) combines laser-Doppler flowmetry and laser scanning to provide images of cerebral blood flow (CBF) with high spatial and temporal resolution. We investigated the contribution of single vascular elements to the local increase of CBF accompanying increased neuronal activity in halothane-anesthetized rats. CBF was examined in the cerebellar cortex under control conditions and in response to electrical stimulation of parallel and climbing fibers. At rest, arterioles contributed 9%, venules 1113% and small vessels (< 20μm) 8-14%, while the background constituted 64-72% of the total SLDF signal. During activation the background signal decreased to 55-60% while the signal from arterioles increased to 1112%, from venules to 14-15% and from small vessels to 14-19%. The signal increase in small vessels that did not give any laser-Doppler signal at rest was due to functional recruitment of red blood cells to the capillary bed. We conclude that functional recruitment may be an integral part of the hemodynamic response accompanying neuronal activity.
AB - SCANNING laser-Doppler flowmetry (SLDF) combines laser-Doppler flowmetry and laser scanning to provide images of cerebral blood flow (CBF) with high spatial and temporal resolution. We investigated the contribution of single vascular elements to the local increase of CBF accompanying increased neuronal activity in halothane-anesthetized rats. CBF was examined in the cerebellar cortex under control conditions and in response to electrical stimulation of parallel and climbing fibers. At rest, arterioles contributed 9%, venules 1113% and small vessels (< 20μm) 8-14%, while the background constituted 64-72% of the total SLDF signal. During activation the background signal decreased to 55-60% while the signal from arterioles increased to 1112%, from venules to 14-15% and from small vessels to 14-19%. The signal increase in small vessels that did not give any laser-Doppler signal at rest was due to functional recruitment of red blood cells to the capillary bed. We conclude that functional recruitment may be an integral part of the hemodynamic response accompanying neuronal activity.
KW - Brain activation
KW - Cerebellum
KW - Climbing fibers
KW - Microcirculation
KW - Parallel fibers
KW - Scanning laser-Doppler flowmetry
UR - http://www.scopus.com/inward/record.url?scp=0032718406&partnerID=8YFLogxK
U2 - 10.1097/00001756-199911080-00002
DO - 10.1097/00001756-199911080-00002
M3 - Journal article
C2 - 10599830
AN - SCOPUS:0032718406
VL - 10
SP - 3257
EP - 3263
JO - NeuroReport
JF - NeuroReport
SN - 0959-4965
IS - 16
ER -
ID: 201453679