Unusual Detection of Lathosterol in Amniotic Fluids Investigated for the Determination of Cholesterol and 7-Dehydrocholesterol for Suspected Smith-Lemli-Opitz Syndrome  

作　　者：Veniero Gambaro Fiorenza Farè Andrea Barlocco Federico Maggi Giuseppe Simoni Lucia Dell’Acqua Chiara Rusconi Gabriella Roda 

机构地区：[1]Dipartimento di Scienze Farmaceutiche “Pietro Pratesi”, University of Milan, Milan, Italy [2]Laboratorio TOMA srl, Busto Arsizio, Italy

出　　处：《American Journal of Analytical Chemistry》2014年第4期249-257,共9页美国分析化学（英文）

摘　　要：The Smith-Lemli-Opitz syndrome (SLOS), is an autosomal recessive disorder caused by a 7-dehydrocholesterol reductase deficiency, which is characterized by abnormally elevated amniotic fluid 7-DHC (7-dehydrocholesterol) concentrations. A GC/FID (gas-chromatography with a flame ionization detector) and GC/MS (gas-chromatography with a mass detector) method was optimized for the detection of cholesterol and 7-DHC in amniotic fluids. The quantitative determination of cholesterol in 39 control amniotic fluids evidenced that between the fourth and fifth month of pregnancy the levels of this analyte are quite constant, the concentration of total and free cholesterol being respectively 10.3 μg·mL﹣1 (SD = ±3.6) and 1.7 μg·mL﹣1 (SD = ±0.91), while the analysis of 60 amniotic fluids potentially related to SLOS, showed a higher variability of cholesterol levels. Moreover, in 13 samples an analyte which did not correspond either to cholesterol or to 7-DHC was detected. A GC/MS investigation allowed us to identify this compound as lathosterol, a precursor of cholesterol in the biosynthetic pathway.The Smith-Lemli-Opitz syndrome (SLOS), is an autosomal recessive disorder caused by a 7-dehydrocholesterol reductase deficiency, which is characterized by abnormally elevated amniotic fluid 7-DHC (7-dehydrocholesterol) concentrations. A GC/FID (gas-chromatography with a flame ionization detector) and GC/MS (gas-chromatography with a mass detector) method was optimized for the detection of cholesterol and 7-DHC in amniotic fluids. The quantitative determination of cholesterol in 39 control amniotic fluids evidenced that between the fourth and fifth month of pregnancy the levels of this analyte are quite constant, the concentration of total and free cholesterol being respectively 10.3 μg·mL﹣1 (SD = ±3.6) and 1.7 μg·mL﹣1 (SD = ±0.91), while the analysis of 60 amniotic fluids potentially related to SLOS, showed a higher variability of cholesterol levels. Moreover, in 13 samples an analyte which did not correspond either to cholesterol or to 7-DHC was detected. A GC/MS investigation allowed us to identify this compound as lathosterol, a precursor of cholesterol in the biosynthetic pathway.

关 键 词：Lathosterol CHOLESTEROL SLO Syndrome Amniotic Fluid GC/FID GC/MS 

分 类 号：R73[医药卫生—肿瘤]