| First Author | Horikami D | Year | 2019 |
| Journal | J Pathol | Volume | 248 |
| Issue | 3 | Pages | 280-290 |
| PubMed ID | 30734298 | Mgi Jnum | J:278411 |
| Mgi Id | MGI:6323736 | Doi | 10.1002/path.5253 |
| Citation | Horikami D, et al. (2019) L-PGDS-derived PGD2 attenuates acute lung injury by enhancing endothelial barrier formation. J Pathol 248(3):280-290 |
| abstractText | Acute lung injury (ALI) is caused by various stimuli such as acid aspiration and infection, resulting in severe clinical outcomes with high mortality. Prostaglandin D2 (PGD2 ) is a lipid mediator produced in the lungs of patients with ALI. There are two prostaglandin D synthases (PGDS), namely, lipocalin-type PGDS (L-PGDS) and hematopoietic PGDS (H-PGDS). We previously reported the anti-inflammatory role of H-PGDS-derived PGD2 in an endotoxin-induced murine ALI model. Therefore, in this study, we investigated the role of L-PGDS-derived PGD2 in ALI in comparison to H-PGDS-derived PGD2 . Intratracheal administration of HCl caused lung inflammation accompanied by tissue edema and neutrophil accumulation in mouse lungs. The deficiency of both L-PGDS and H-PGDS exacerbated HCl-induced lung dysfunction to a similar extent. Furthermore, a detailed investigation revealed that L-PGDS-derived PGD2 inhibited lung edema, while H-PGDS-derived PGD2 inhibited neutrophil infiltration. Immunostaining showed that inflamed endothelial/epithelial cells express L-PGDS, while macrophages and neutrophils express H-PGDS. Hematopoietic reconstitution with WT bone marrow did not rescue the exacerbated lung edema in L-PGDS deficient mice, indicating the importance of nonhematopoietic endothelial/epithelial cell-expressing L-PGDS for protection against ALI. A modified Miles assay showed that L-PGDS deficiency accelerated vascular hyper-permeability in the inflamed lung, which was suppressed by the stimulation of D prostanoid (DP) receptor, a PGD2 receptor. In vitro, DP agonism enhanced the barrier function of endothelial cells but not epithelial cells. Taken together, our results suggest that in the HCl-induced murine ALI model PGD2 was produced locally by inflamed endothelial and epithelial L-PGDS and this enhanced the endothelial barrier through the DP receptor. Copyright (c) 2019 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. |
