Cilostazol strengthens the endothelial barrier of postcapillary venules from the rat mesentery in situ

Yasoo Sugiura, Takayuki Morikawa, Toshiki Takenouchi, Makoto Suematsu, Mayumi Kajimura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Objective: Although cilostazol, a phosphodiesterase 3 inhibitor, has been suggested to strengthen the endothelial barrier using cultured endothelial monolayers, its effect has not been tested in vivo. We, therefore, investigated effects of cilostazol on barrier properties of postcapillary venules of the rat in situ. Methods: Cilostazol was administered to the rats through oral gavage at 4 hours before the measurements. The hydraulic permeability (Lp) and the effective osmotic pressure ((Formula presented.)), molecular sieving properties of microvascular walls, were estimated in single mesenteric postcapillary venules by a micro-occlusion technique, first during control perfusion and then in the presence of histamine. Results: When the vessels were inflamed with histamine, cilostazol attenuated a transient increase in Lp and prevented (Formula presented.) from falling. Furthermore, it reduced baseline Lp under a control state. Conclusion: Cilostazol appears to tighten the endothelial barrier in situ, at least in part by inhibiting the cAMP-degrading enzyme in the endothelium.

Original languageEnglish
Pages (from-to)594-599
Number of pages6
Issue number9
Publication statusPublished - 2014 Oct


  • Microvascular permeability
  • antiplatelet drugs
  • phosphodiesterase 3

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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