Summary Background Intrahepatic cholestasis of pregnancy is associated with adverse perinatal outcomes, but the association with the concentration of specific biochemical markers is unclear. We aimed to quantify the adverse perinatal effects of intrahepatic cholestasis of pregnancy in women with increased serum bile acid concentrations and determine whether elevated bile acid concentrations were associated with the risk of stillbirth and preterm birth. Methods We did a systematic review by searching PubMed, Web of Science, and Embase databases for studies published from database inception to June 1, 2018, reporting perinatal outcomes for women with intrahepatic cholestasis of pregnancy when serum bile acid concentrations were available. Inclusion criteria were studies defining intrahepatic cholestasis of pregnancy based upon pruritus and elevated serum bile acid concentrations, with or without raised liver aminotransferase concentrations. Eligible studies were case-control, cohort, and population-based studies, and randomised controlled trials, with at least 30 participants, and that reported bile acid concentrations and perinatal outcomes. Studies at potential higher risk of reporter bias were excluded, including case reports, studies not comprising cohorts, or successive cases seen in a unit; we also excluded studies with high risk of bias from groups selected (eg, a subgroup of babies with poor outcomes were explicitly excluded), conference abstracts, and Letters to the Editor without clear peer review. We also included unpublished data from two UK hospitals. We did a random effects meta-analysis to determine risk of adverse perinatal outcomes. Aggregate data for maternal and perinatal outcomes were extracted from case-control studies, and individual patient data (IPD) were requested from study authors for all types of study (as no control group was required for the IPD analysis) to assess associations between biochemical markers and adverse outcomes using logistic and stepwise logistic regression. This study is registered with PROSPERO, number CRD42017069134. Findings We assessed 109 full-text articles, of which 23 studies were eligible for the aggregate data meta-analysis (5557 intrahepatic cholestasis of pregnancy cases and 165 136 controls), and 27 provided IPD (5269 intrahepatic cholestasis of pregnancy cases). Stillbirth occurred in 45 (0·83%) of 4936 intrahepatic cholestasis of pregnancy cases and 519 (0·32%) of 163 947 control pregnancies (odds ratio [OR] 1·46 [95% CI 0·73–2·89]; I 2 =59·8%). In singleton pregnancies, stillbirth was associated with maximum total bile acid concentration (area under the receiver operating characteristic curve [ROC AUC]) 0·83 [95% CI 0·74–0·92]), but not alanine aminotransferase (ROC AUC 0·46 [0·35–0·57]). For singleton pregnancies, the prevalence of stillbirth was three (0·13%; 95% CI 0·02–0·38) of 2310 intrahepatic cholestasis of pregnancy ca...

Background Intrahepatic cholestasis of pregnancy is associated with adverse perinatal outcomes, but the association with the concentration of specific biochemical markers is unclear. We aimed to quantify the adverse perinatal effects of intrahepatic cholestasis of pregnancy in women with increased serum bile acid concentrations and determine whether elevated bile acid concentrations were associated with the risk of stillbirth and preterm birth. Methods We did a systematic review by searching PubMed, Web of Science, and Embase databases for studies published from database inception to June 1, 2018, reporting perinatal outcomes for women with intrahepatic cholestasis of pregnancy when serum bile acid concentrations were available. Inclusion criteria were studies defining intrahepatic cholestasis of pregnancy based upon pruritus and elevated serum bile acid concentrations, with or without raised liver aminotransferase concentrations. Eligible studies were case-control, cohort, and populationbased studies, and randomised controlled trials, with at least 30 participants, and that reported bile acid concentrations and perinatal outcomes. Studies at potential higher risk of reporter bias were excluded, including case reports, studies not comprising cohorts, or successive cases seen in a unit; we also excluded studies with high risk of bias from groups selected (eg, a subgroup of babies with poor outcomes were explicitly excluded), conference abstracts, and Letters to the Editor without clear peer review. We also included unpublished data from two UK hospitals. We did a random effects meta-analysis to determine risk of adverse perinatal outcomes. Aggregate data for maternal and perinatal outcomes were extracted from case-control studies, and individual patient data (IPD) were requested from study authors for all types of study (as no control group was required for the IPD analysis) to assess associations between biochemical markers and adverse outcomes using logistic and stepwise logistic regression. This study is registered with PROSPERO, number CRD42017069134. Findings We assessed 109 full-text articles, of which 23 studies were eligible for the aggregate data meta-analysis (5557 intrahepatic cholestasis of pregnancy cases and 165 136 controls), and 27 provided IPD (5269 intrahepatic cholestasis of pregnancy cases). Stillbirth occurred in 45 (0•91%) of 4936 intrahepatic cholestasis of pregnancy cases and 519 (0•32%) of 163 947 control pregnancies (odds ratio [OR] 1•46 [95% CI 0•73-2•89]; I²=59•8%). In singleton pregnancies, stillbirth was associated with maximum total bile acid concentration (area under the receiver operating characteristic curve [ROC AUC]) 0•83 [95% CI 0•74-0•92]), but not alanine aminotransferase (ROC AUC 0•46 [0•35-0•57]). For singleton pregnancies, the prevalence of stillbirth was three (0•13%; 95% CI 0•02-0•38) of 2310 intrahepatic cholestasis of pregnancy cases in women with serum total bile acids of less than 40 µmol/L versus four (0•28%; 0•08-0•72) of 1412 cases with total bile acids of 40-99 µ...

Bile acids, synthesized by hepatocytes from cholesterol, are specific and quantitatively important organic components of bile, where they are the main driving force of the osmotic process that generates bile flow toward the canaliculus. The bile acid pool comprises a variety of species of amphipathic acidic steroids. They are not mere detergent molecules that play a key role in fat digestion and the intestinal absorption of hydrophobic compounds present in the intestinal lumen after meals, including liposoluble vitamins. They are now known to be involved in the regulation of multiple functions in liver cells, mainly hepatocytes and cholangiocytes, and also in extrahepatic tissues. The identification of nuclear receptors, such as farnesoid X receptor (FXR or NR1H4), and plasma membrane receptors, such as the G protein-coupled bile acid receptor (TGR5, GPBAR1 or MBAR), which are able to trigger specific and complex responses upon activation (with dissimilar sensitivities) by different bile acid molecular species and synthetic agonists, has opened a new and promising field of research whose implications extend to physiology, pathology and pharmacology. In addition, pharmacological development has taken advantage of advances in the understanding of the chemistry and biology of bile acids and the biological systems that interact with them, which in addition to the receptors include several families of transporters and export pumps, to generate novel bile acid derivatives aimed at treating different liver diseases, such as cholestasis, biliary diseases, metabolic disorders and cancer. This review is an update of the role of bile acids in health and disease.

Cholestasis of pregnancy induces alterations in bile acid transport by human trophoblast plasma membrane (TPM) vesicles. We investigated whether maternal cholestasis affects the overall ability of the rat placenta to carry out vectorial bile acid transfer from the fetus to the mother.

importance of the implications derived from these findThe effect of total blockage of maternal biliary excreings both in the nutrition and management of human tion during the last third of the pregnancy on the matuneonates demands further evaluation of the hepatobiliration of hepatobiliary function was investigated in neoary function of babies born after alterations of fetal-manatal rats. Extrahepatic obstruction of the common bile ternal bile acid homeostasis, such as in maternal obstetduct on day 14 of pregnancy induced a marked enhanceric cholestasis. (HEPATOLOGY 1996;23:1208-1217.) ment in serum bilirubin-mainly conjugated bilirubinand bile acid concentrations as compared with shamoperated pregnant rats. Excretion of bile acids by the Normal fetal development requires efficient transfer kidney was significantly increased, whereas fecal elimi-across the placenta. Nutrients are supplied by the nation of these compounds was almost abolished. Most mother while certain potentially toxic compounds cross of the cholestatic mothers (CMs) (77%) were able to carry the placenta, mainly in the fetus-to-mother direction. pregnancy to term and lactation until weaning (21 days Among the latter are bile acids. Both in humans and after birth). The body and liver weights of their offspring experimental animals, the onset of bile acid biosynthewere lower than for offspring of control healthy mothers sis precedes the development of efficient mechanisms in all postnatal periods considered. Serum bile acid concentrations were higher in the fetuses and neonates of involved in enterohepatic circulation.1 Hepatic insuffiCMs. This difference was evident up to 1 week after ciency with respect to bile acid secretion is found in weaning and disappeared in young adult animals (8 both premature and full-term infants.2 This is accomweeks old). When the bile secretion rate was investi-panied by a marked immaturity of small intestinal gated in these animals at 4 or 8 weeks of age, no signifi-transport of bile acids. [3][4][5] Because the accumulation of cant difference was found as far as nonstimulated bile bile acids within the fetus can seriously challenge the flow and bile acid output was concerned. However, the viability of pregnancy, such compounds must be transbiliary response to stepwise sodium taurocholate (TC) ferred to the mother, whose liver is able to excrete them intravenous infusion showed that 4-week-old neonates into bile. Therefore, fetal-maternal bile acid homeostaof CMs had impaired bile acid secretion. Moreover, the sis requires both functional placental transfer and normaximal secretion rate (SR max ) for TC was significantly reduced (030%), whereas the choleretic ability of tauro-mal maternal hepatobiliary function. cholate was not modified. This alteration was not selec-Obstetric cholestasis is a pathological situation chartive for bile acids. The SR max for bromosulfophthalein acterized by a 10-to 100-fold increase in postprandial (BSP) was also significantly lowered (040%). These dys-bile acid concentrations in the m...