Objective To investigate the accumulation of liver bile acids and bile acid regulated nuclear receptor farnesoid X (FXR) and its target gene cholesterol 7α hydroxylase (Cyp7α1) and small different dimer partner (SHP) in normal rats during pregnancy and lactation .Methods SD rats were maintained in the SPF‐grade facilities for time‐controlled mate .Livers were collect‐ed at Gestation Day (GD) 10 ,14 ,and 19 and Postnatal Day (PND) 1 ,7 ,14 and 21 d .Hepatic bile acids were quantified with a total bile acid assay kit ,and mRNA expression of FXR ,Cyp7α1 and SHP was determined by RT‐PCR .Western blot was used for Cyp7α1 protein quantification .Results In livers of normal rats ,bile acids was not elevated during pregnancy but was increased during lacta‐tion .The bile acid synthesis rate limiting enzyme Cyp7α1 increased during lactation but were normal during pregnancy .SHP was 6 fold higher at the late pregnancy ,and slightly higher during lactation .FXR was increased at postpartum .Conclusion Under normal circumstances ,hepatic bile acid synthesis during pregnancy was controlled by SHP feedback ,while during lactation ,hepatic bile acids increased ,along with increased Cyp7α1 and FXR .%目的：研究健康SD鼠在妊娠和哺乳期肝脏胆酸代谢基因的变化。方法取孕10、14、19 d及产后1、7、14、21 d的大鼠肝脏，检测胆酸水平和肝脏法尼醇X受体（FXR）、小异二聚体伴侣受体（SHP）、胆固醇7α‐羟化酶（Cyp7α1）的表达。用West‐ern blot法测Cyp7α1的蛋白表达情况。结果孕晚期健康大鼠，肝脏中胆酸及Cyp7α1表达不升高；哺乳期的大鼠，肝脏胆酸增加，FXR表达升高；在孕晚期及哺乳期靶基因SHP表达均高于对照组，且其表达高峰期是第孕19天，其值可达对照组的6倍之多。结论健康大鼠在产后肝脏胆酸合成增加，而孕期减少，可能与Cyp7α1、FXR及SHP表达有关。
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