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Feng X, Zhang Y, Zhang Y, Yang X, Man D, Lu L, Xu T, Liu Y, Yang C, Li H, Qi L, Su H, Zhou X, Xu Z. Prostaglandin I2 mediates weak vasodilatation in human placental microvessels. Biol Reprod 2020; 103:1229-1237. [PMID: 32902654 DOI: 10.1093/biolre/ioaa156] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 08/20/2020] [Accepted: 09/04/2020] [Indexed: 01/14/2023] Open
Abstract
Human placental vessels (HPVs) play important roles in the exchange of metabolites and oxygen in maternal-fetal circulation. Endothelial-derived prostacyclin (prostaglandin I2, PGI2) is a critical endothelial vasodilator in the body. However, the physiological and pharmacological functions of endothelial PGI2 in the human placenta are still unclear. Human, sheep, and rat blood vessels were used in this study. Unlike non-placental vessels (non-PVs), the PGI2 synthesis inhibitor tranylcypromine (TCP) did not modify 5-hydroxytryptamine (5-HT)-induced vascular contraction, indicating that endothelial-derived PGI2 was weak in PVs. Vascular responses to exogenous PGI2 showed slight relaxation followed by a significant contraction at a higher concentration in HPV, which was inhibited by the thromboxane-prostanoid (TP) receptors antagonist SQ-29,548. Testing PVs and non-PVs from sheep also showed similar functional results. More TP receptors than PGI2 (IP) receptors were observed in HPVs. The whole-cell K+ current density of HPVs was significantly weaker than that of non-PVs. This study demonstrated the specific characteristics of the placental endogenous endothelial PGI2 system and the patterns of placental vascular physiological/pharmacological response to exogenous PGI2, showing that placental endothelial PGI2 does not markedly contribute to vascular dilation in the human placenta, in notable contrast to non-PVs. The results provide crucial information for understanding the endothelial roles of HPVs, which may be helpful for further investigations of potential targets in the treatment of diseases such as preeclampsia.
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Affiliation(s)
- Xueqin Feng
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China.,Department of Obstetrics, Affiliated Hospital of Jining Medical University, Jining, China
| | - Yingying Zhang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Yumeng Zhang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Xiaojun Yang
- Department of Obstetrics and Gynecology, First Hospital of Soochow University, Suzhou, China
| | - Dongmei Man
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Jining, China
| | - Likui Lu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Ting Xu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Yanping Liu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Chunli Yang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Huan Li
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Linglu Qi
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Hongyu Su
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Xiuwen Zhou
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
| | - Zhice Xu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China
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