E. coli lipopolysaccharide attenuates adenosine A(1) receptor-mediated increase in plasma exudation from the hamster cheek pouch.

E. coli lipopolysaccharide attenuates adenosine A(1) receptor-mediated increase in plasma exudation from the hamster cheek pouch.
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DOI:
10.1007/s00011-010-0254-9
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发表时间:
2011-02
影响因子:
6.7
通讯作者:
Rubinstein, Israel
Rubinstein, Israel
中科院分区:
医学2区
文献类型:
--
作者:
Gao, Xiao-pei;Rubinstein, Israel

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To determine whether exposure to E. coli lipopolysaccharide (LPS) modulates adenosine A1 receptor-induced increase in plasma exudation from the intact hamster cheek pouch microcirculation. Using intravital microscopy, we found that suffusion of R(−)-N6-(2-phenylisopropyl)-adenosine (R(−)-PIA) (1.0 and 10.0 nM), a selective adenosine A1 receptor agonist, onto the intact cheek pouch elicited significant, concentration-dependent leaky site formation and increase in clearance of fluorescein thioisocyanate-dextran (mol mass, 70 kDa) from post-capillary venules (p < 0.05). These responses were significantly attenuated by pre-treatment of hamsters with LPS (p < 0.05). By contrast, LPS had no significant effects on CGS-21680-, a selective adenosine A2A receptor agonist, bradykinin- and substance P-induced increases in plasma exudation from the cheek pouch. These data indicate that LPS attenuates adenosine A1 receptor-induced increase in plasma exudation in vivo in a specific fashion. We suggest that this phenomenon represents an endogenous anti-inflammatory cue to avoid excessive inflammation during Gram-negative bacterial infections.
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