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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Microcirculation
2013 ; 20
(7
): 650-61
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Improvement in middle cerebral artery structure and endothelial function in
stroke-prone spontaneously hypertensive rats after macrophage depletion
#MMPMID23647512
Pires PW
; Girgla SS
; McClain JL
; Kaminski NE
; van Rooijen N
; Dorrance AM
Microcirculation
2013[Oct]; 20
(7
): 650-61
PMID23647512
show ga
BACKGROUND: Inflammation is involved in the pathogenesis of hypertension.
Hypertensive animals have an increased number of perivascular macrophages in
cerebral arteries. Macrophages might be involved in remodeling of the cerebral
vasculature. We hypothesized that peripheral macrophage depletion would improve
MCA structure and function in hypertensive rats. METHODS: For macrophage
depletion, six-week-old stroke-prone spontaneously hypertensive rats (SHRSP) were
treated with CLOD, 10 mL/kg every three or four days, i.p., or vehicle (PBS
lipo). MCA structure and function were analyzed by pressure and wire myography.
RESULTS: Blood pressure was not affected by CLOD. The number of perivascular
CD163-positive cells per microscopic field was reduced in the brain of
SHRSP+CLOD. CLOD treatment caused an improvement in endothelium-dependent
dilation after intralumenal perfusion of ADP and incubation with Ach. Inhibition
of NO production blunted the Ach response, and endothelium-independent dilation
was not altered. At an intralumenal pressure of 80 mmHg, MCA from SHRSP+CLOD
showed increased lumen diameter, decreased wall thickness, and wall-to-lumen
ratio. Cross-sectional area of pial arterioles from SHRSP+CLOD was higher than
PBS lipo. CONCLUSIONS: These results suggest that macrophage depletion attenuates
MCA remodeling and improves MCA endothelial function in SHRSP.
|*Blood Pressure
[MESH]
|*Cerebrovascular Circulation
[MESH]
|*Macrophages
[MESH]
|*Vasodilation
[MESH]
|Animals
[MESH]
|Bone Density Conservation Agents/pharmacology
[MESH]