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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 Am+J+Physiol+Heart+Circ+Physiol
2014 ; 307
(12
): H1745-53
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Platelets, acting in part via P-selectin, mediate cytomegalovirus-induced
microvascular dysfunction
#MMPMID25326535
Khoretonenko MV
; Brunson JL
; Senchenkov E
; Leskov IL
; Marks CR
; Stokes KY
Am J Physiol Heart Circ Physiol
2014[Dec]; 307
(12
): H1745-53
PMID25326535
show ga
Cytomegalovirus (CMV) infects a majority of the population worldwide. It has been
implicated in cardiovascular disease, induces microvascular dysfunction, and
synergizes with hypercholesterolemia to promote leukocyte and platelet
recruitment in venules. Although platelets and platelet-associated P-selectin
contribute to cardiovascular disease inflammation, their role in CMV-induced
vascular responses is unknown. We assessed the role of platelets in CMV-induced
microvascular dysfunction by depleting platelets and developing bone marrow
chimeric mice deficient in platelet P-selectin. Wild-type and chimeric mice
received mock or murine (m)CMV intraperitoneally. Five weeks later, some mice
were switched to a high-cholesterol diet (HC) to investigate the synergism
between mCMV and HC. Arteriolar vasodilation and recruitment of leukocytes and
donor platelets in venules were measured at 11wk. mCMV with or without HC caused
significant endothelial dysfunction in arterioles. Platelet depletion restored
normal vasodilation in mCMV-HC but not mCMV-ND mice, whereas protection was seen
in both groups for platelet P-selectin chimeras. Only mCMV + HC elevated
leukocyte and platelet recruitment in venules. Leukocyte adhesion was reduced to
mock levels by acute platelet depletion but was only partially decreased in
platelet P-selectin chimeras. Platelets from mCMV-HC mice and, to a lesser
extent, mCMV-ND but not mock-HC mice showed significant adhesion in mCMV-HC
recipients. Our findings implicate a role for platelets, acting through
P-selectin, in CMV-induced arteriolar dysfunction and suggest that the addition
of HC leads to a platelet-dependent, inflammatory infiltrate that is only partly
platelet P-selectin dependent. CMV appeared to have a stronger activating
influence than HC on platelets and may represent an additional therapeutic target
in vulnerable patients.