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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
2016 ; 23
(4
): 301-10
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Sphingosine-1-phosphate Maintains Normal Vascular Permeability by Preserving
Endothelial Surface Glycocalyx in Intact Microvessels
#MMPMID27015105
Zhang L
; Zeng M
; Fan J
; Tarbell JM
; Curry FR
; Fu BM
Microcirculation
2016[May]; 23
(4
): 301-10
PMID27015105
show ga
OBJECTIVE: S1P was found to protect the ESG by inhibiting MMP activity-dependent
shedding of ESG in cultured endothelial cell studies. We aimed to further test
that S1P contributes to the maintenance of normal vascular permeability by
protecting the ESG in intact microvessels. METHODS: We quantified the ESG in
post-capillary venules of rat mesentery and measured the vascular permeability to
albumin in the presence and absence of 1 ?M S1P. We also measured permeability to
albumin in the presence of MMP inhibitors and compared the measured permeability
with those predicted by a transport model for the inter-endothelial cleft.
RESULTS: We found that in the absence of S1P, the fluorescence intensity of the
FITC-anti-HS-labeled ESG was ~10% of that in the presence of S1P, whereas the
measured permeability to albumin was ~6.5-fold of that in the presence of S1P.
Similar results were observed with MMP inhibition. The predictions by the
mathematical model further confirmed that S1P maintains microvascular
permeability by preserving ESG. CONCLUSIONS: Our results show that S1P
contributes to the maintenance of normal vascular permeability by protecting the
ESG in intact microvessels, consistent with parallel observation in cultured
endothelial monolayers.