Journal of Capital Medical University ›› 2019, Vol. 40 ›› Issue (2): 257-262.doi: 10.3969/j.issn.1006-7795.2019.02.019

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Angiotensin Ⅱ type 1 receptor autoantibody-positive female rats showed hypertensive disorder after pregnancy

Bian Jingwei, Yin Xiaochen, Li Hao, Zhang Suli, Wang Meili, Liu Huirong   

  1. Department of Physiology & Pathophysiology, Beijing Key Laboratory of Cardiovascular Diseases and Related Metabolic Dysfunction, Capital Medical University, International Cooperative Laboratory of Cardiovascular Diseases and Related Metabolic Dysfunction, Beijing 100069, China
  • Received:2018-11-22 Online:2019-03-21 Published:2019-04-15
  • Supported by:
    This study was supported by National Natural Science Foundation of China (91539205).

Abstract: Objective To investigate whether angiotensin Ⅱ type 1 receptor autoantibody (AT1-AA)-positive rats exhibited the phenomenon of gestational hypertension after pregnancy. Methods Clinical serum samples were collected to detect the presence of AT1-AA in non-pregnant healthy women by enzyme linked immunosorbent assay (ELISA). AT1-AA-positive rat model was established by active immunization. Tail-cuff method was used to measure the systolic blood pressure and the mesenteric artery ring was used to detect vascular function. Results AT1-AA was also present in some healthy women who were not pregnant. There was no significant difference in blood pressure between AT1-AA-positive rats and control rats before pregnancy, but the systolic pressure of AT1-AA-positive rats after pregnancy was significantly higher than that of control rats. Mesenteric artery ring showed that the vasoconstriction was increased (vehicle group:110%±5%, immunized group:130%±10%, P<0.05), and endothelium-dependent/non-endothelium-dependent vasodilation was decreased in AT1-AA-positive rats after pregnancy (vehicle group:90%±4%, immunized group:60%±7%/vehicle group:95%±1%, immunized group:75%±3%, P<0.05). Conclusion AT1-AA-positive rats after pregnancy showed the phenomenon of gestational hypertension, such as elevated blood pressure and impaired vascular function. These suggested that the presence of AT1-AA in healthy individuals was a risk factor for gestational hypertension.

Key words: Angiotensin Ⅱ type 1 receptor, autoantibody, blood pressure, vascular dysfunction

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