| First Author | Kobayashi K | Year | 2013 |
| Journal | Arterioscler Thromb Vasc Biol | Volume | 33 |
| Issue | 3 | Pages | 565-71 |
| PubMed ID | 23307871 | Mgi Jnum | J:216889 |
| Mgi Id | MGI:5609906 | Doi | 10.1161/ATVBAHA.112.300993 |
| Citation | Kobayashi K, et al. (2013) Prostaglandin D2-DP signaling promotes endothelial barrier function via the cAMP/PKA/Tiam1/Rac1 pathway. Arterioscler Thromb Vasc Biol 33(3):565-71 |
| abstractText | OBJECTIVE: Prostaglandin D(2) (PGD(2)) is one of the prostanoids produced during inflammation. Although PGD(2) is known to decrease endothelial permeability through D prostanoid (DP) receptor stimulation, the detailed mechanism is unknown. METHODS AND RESULTS: Treatment with PGD(2) (0.1-3 mumol/L) or the DP receptor agonist, BW245C (0.1-3 mumol/L), dose-dependently increased transendothelial electrical resistance and decreased the FITC-dextran permeability of human umbilical vein endothelial cells. Both indicated decreased endothelial permeability. These phenomena were accompanied by Tiam1/Rac1-dependent cytoskeletal rearrangement. BW245C (0.3 mumol/L) increased the intracellular cAMP level and subsequent protein kinase A (PKA) activity. Pretreatment with PKA inhibitory peptide, but not gene depletion of exchange protein directly activated by cAMP 1 (Epac1), attenuated BW245C-induced Rac1 activation and transendothelial electric resistance increase. In vivo, application of 2.5% croton oil or histamine (100 mug) caused vascular leakage indexed by dye extravasation. Pretreatment with BW245C (1 mg/kg) attenuated the dye extravasation. Gene deficiency of DP abolished, or inhibition of PKA significantly reduced, the DP-mediated barrier enhancement. CONCLUSIONS: PGD(2)-DP signaling reduces vascular permeability both in vivo and in vitro. This phenomenon is mediated by cAMP/PKA/Tiam1-dependent Epac1-independent Rac1 activation and subsequent enhancement of adherens junction in endothelial cell. |
