RESUMO
Objective To determine whether cold-stress stimulation could lead to pregnancy-induced hypertension syndrome (PIH) in rats. Methods Female adult Wistar female rats were randomly divided into 4 groups: non-pregnant control group (NN), non-pregnant cold-stress group (NC), pregnant control group (PN) and pregnant cold-stress group (PC). The rats were kept in (4±2) ℃ for 4 h (cold-stress groups) every day or remained in 25 ℃ (control groups) from the 1 st day to 19 th day of pregnancy. The blood pressure, urine protein, body weight, haematocrit (HCT), weight of placenta, length and weight of fetus were all measured. The histological change of the placenta and kidneys were also observed. Results After cold-stress stimulation for 2 weeks, the blood pressure, urine protein in NC and PC group increased significantly compared with that in control group, while the weight of placenta and fetus, the length of fetus in PC decreased significantly than that in PN. Obvious ischemic and anoxic histological changes in kidneys and all layers of placenta were found in PC group. Conclusion Repeated cold-stress stimulation can induce PIH in rats, thus provide a new non-invasive method to establish an animal model of PIH.
RESUMO
Objective To determine whether cold-stress stimulation could lead to pregnancy-induced hypertension syndrome (PIH) in rats. Methods Female adult Wistar female rats were randomly divided into 4 groups: non-pregnant control group (NN), non-pregnant cold-stress group (NC), pregnant control group (PN) and pregnant cold-stress group (PC). The rats were kept in (4±2) ℃ for 4 h (cold-stress groups) every day or remained in 25 ℃ (control groups) from the 1 st day to 19 th day of pregnancy. The blood pressure, urine protein, body weight, haematocrit (HCT), weight of placenta, length and weight of fetus were all measured. The histological change of the placenta and kidneys were also observed. Results After cold-stress stimulation for 2 weeks, the blood pressure, urine protein in NC and PC group increased significantly compared with that in control group, while the weight of placenta and fetus, the length of fetus in PC decreased significantly than that in PN. Obvious ischemic and anoxic histological changes in kidneys and all layers of placenta were found in PC group. Conclusion Repeated cold-stress stimulation can induce PIH in rats, thus provide a new non-invasive method to establish an animal model of PIH.