[Regulation of pravastatin on long-chain fatty acid oxidative enzyme in pre-eclampsia-like mouse model]

Objective: To investigate the modulation of long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD) expression by pravastatin in pre-eclampsia-like mouse model. Methods: C57BL/6J mice were randomly injected with N-nitro-L-arginine methyl ester (L-NAME) as pre-eclampsia-like model group (PE) or saline as normal pregnancy control group (Con) respectively, from gestational the 7th to 18th day. For each group, pravastatin (PE+Pra, Con+Pra group) or saline (PE+N, Con+N Group) was given from the 8th to 18th day of gestation, respectively. Liver and placenta of pregnant mice were collected on gestational day 18. The LCHAD protein expression and mRNA levels of liver and placenta were detected through western blot, immunohistochemistry and real-time quantitative PCR. Results: (1) The average arterial pressure of pregnant mice increased gradually from the 8th to 18th day in PE+N group, but decreased in PE+Pra group from gestational 10th day, 24 hour urinary protein levels in PE+N group [(1 494 ± 201) μg] were significantly higher than that in Con+N group [(935±128) μg, P<0.01], and also higher than that in PE+Pra group [(981±116) μg, P<0.01].(2) The results of western blot: the expression of LCHAD was significantly lower in PE+N group (liver: 0.64±0.11, placenta: 0.48±0.06) than that in Con+N group (liver: 1.06±0.10, placenta: 0.60±0.10), and lower than that in PE+Pra group (liver: 0.99±0.04, placenta: 0.60±0.08; all P<0.01).(3)The results of real-time quantitative PCR: the levels of LCHAD mRNA in liver and placenta in PE+N group (liver: 0.621±0.128, placenta: 0.646±0.129) were significantly decreased compared with Con+N group (liver: 1.007±0.130, placenta: 1.004±0.103; all P<0.01), but there was no significant difference between PE+Pra group (liver: 0.693±0.678, placenta: 0.662±0.183; P>0.05). (4) LCHAD protein was expressed widely and evenly in liver. The expression in placental cytotrophoblast and syncytial trophoblast cells located in outer layer of villous in labyrinth layer was the most. The expression of LCHAD was significantly lower in PE+N group (liver: 0.062±0.016, placenta: 0.147±0.018) than that in Con+N group (liver: 0.126±0.013, placenta: 0.183±0.024), and lower than that in PE+Pra group (liver: 0.111±0.017, placenta: 0.174±0.027; all P<0.05). Conclusion: Pravastatin could upregulate the LCHAD protein expression of liver and placenta in the pre-eclampsia-like mouse, which may be a mechanism to improve the clinical manifestations of pre-eclampsia.