国际载脂蛋白 A1、B 参考材料靶值的转移

用国产载脂蛋白（ａｐｏ）Ａ１、Ｂ免疫比浊试剂盒和生化自动分析仪，按照美国西北脂类研究实验室（ＮＷＬＲＬ）制定的国际ａｐｏＡ１、Ｂ参考材料靶值转移方案进行三期实验考核，结果证实从国际参考材料的靶值转移到本室制备的参考血清（Ｎｏ．９６０７０１）后，本室参考血清和检测系统保持良好的准确度和精密度。ＮＷＬ－ＲＬ提供的４０份血清ａｐｏＡ１、Ｂ测定结果与其靶值相比较，相关系数分别为０．９９３和０．９９５，平均绝对偏差为１．７％和３．１％，达到方案规定的合格标准，获得了ＮＷＬＲＬ颁发的ＷＨＯ－ＩＦＣＣａｏｐＡ１、Ｂ国际标准靶值转移合格证书。     

apo A1和apo B侯选参考方法在室间质量评价中的应用价值

目的 探讨载脂蛋白(apo)A1和apo B的候选参考方法 在室间质量评价(EQA)中的应用价值.方法 以5个水平的冰冻人血清制品作为EQA质评物,采用免疫透射比浊法(ITA)检测.采用同位素稀释液相色谱串联质谱(ID-LC-MS/MS)定量技术对EQA样本进行定值,包括变性、烷基化和胰蛋白酶酶解处理,使用C18色谱柱...     

载脂蛋白A1和B测定方法中标准曲线方式的评价

目的 :对载脂蛋白 ( Apolipoprotein,apo) A1和 B测定中的一点标准以及多点标准进行评价。方法 :以免疫透射比浊法 ( Immunoturbidimetry)中的一点法及二点法测定低、中、高值样品共 1 0 0例 ,比较采用不同方法标准曲线所得结果的差异。结果 :使用不同试剂及方法测定 ,单一试剂的一点法与二点法存在显著性差异 ;国产试剂用一点法一点定标 ,一点法多点非线性定标、二点法多点线性定标 ,均与进口试剂有统计学差异 ;而单一试剂二点法多点非线性定标结果与进口试剂的测定接近一致。结论 :多点标准优于一点标准 ;在单一试剂测定中 ,二点法好于一点法。     

Serum A1 and B apolipoprotein determination: comparison of an immunoturbidimetric method with a monoclonal-antibody-based radial immunodiffusion assay

Summary Epidemiological and clinical evidence have indicated that apolipoprotein A1 and B determination can better define the lipoprotein pattern in normal subjects and in subjects with coronary heart disease. In this paper, a recent immunoturbidimetric method for routine apolipoprotein A1 and B measurement (using the Turbitimer system and commercially available antisera) has been evaluated. The precision and the accuracy of the method have been previously considered. Within-run and between-run coefficients of variation (ranging from 1.67% to 5.04%) for both assays indicate good precision of the method. Accuracy was evaluated on 2 consecutive days (n=10 each run) using a standard serum for apolipoprotein A1 and B. The bias obtained was 3.79% for apolipoprotein A1 and 2.30% for B. Apolipoproteins A1 and B were then measured in 100 normal and hyperlipemic sera with the immunoturbidimetric assay and radial immunodiffusion (using the monoclonal antibodies). The data obtained were evaluated by linear regression analysis (A1,r=0.893; B,r=0.862). The good correlation between the two methods suggests that the immunoturbidimetric assay can be usefully performed for routine apolipoprotein A1 and B determination because of its lower cost, rapidity, and simplicity.     

血清apo A1、apo B、apo E与特应性皮炎的相关性

目的探讨血清载脂蛋白(apo)A1、apo B、apo E水平与特应性皮炎(AD)的相关性。方法选取230例AD患者及100名无过敏性疾病史的体检健康者,检测血清apo A1、apo B、apo E、总免疫球蛋白E(IgE)及过敏原[特异性免疫球蛋白E(sIgE)]水平。采用Logistic回归分析评估各项目及其与AD发病风险的关系。结果AD组和正常对照组女性血清apo A1水平均高于男性(P<0.05)。AD组女性血清apo A1水平高于正常对照组女性(P<0.05)。AD组男性血清apo B水平低于正常对照组男性(P<0.01)。sIgE阳性者男女比例与总IgE>200 kU/L者比较,差异无统计学意义(P>0.05)。以7岁为年龄分组界限,≤7岁组与>7岁组sIgE阳性率和总IgE>200 kU/L比例差异均无统计学意义(P>0.05)。apo A1、apo B与apo E均呈正相关(r值分别为0.190、0.287,P<0.01)。apo A1与apo B无相关性(r=0.030,P>0.05)。apo A1、apo B和apo E均与年龄呈正相关(r值分别为0.191、0.417、0.143,P<0.01)。Logistic回归分析结果显示,apo A1可增加AD的发病风险[比值比(OR)=7.346,95%可信区间(CI)为2.349~22.977],但与总IgE和sIgE无关;apo B校正年龄、性别后与AD发病风险无关,但可增加总IgE>200 kU/L的风险(OR=6.694,95%CI为1.739~25.762)。apo E无论是否校正年龄和性别均与AD发病风险、总IgE和sIgE无关。结论apo A1可能是独立于IgE介导的参与AD发病的危险因子。apo B受年龄、性别等因素的影响较大,与AD发病风险的关系尚不明确。apo E与AD的发病风险无关。     

深圳市成人血清载脂蛋白A1和B参考值调查

目的调查深圳市健康成人血清载脂蛋白（apo）A1、B和apoB／apoA1比值的参考值。方法以WHO国际参考血清为校准物，用免疫透射比法法测定2642例深圳市健康成人（18～86岁，男1319例，女1323例）血清apoA1和B水平，计算apoB／apoA1比值。结果各指标男女间均有显著性差异（P＜0．001），并与年龄有关。参考值（5％～95％）为：apoA1男1．42（1.15～1.68）g／L，，女1．45（1．14～1．77）g／L；apoB男0．86（0．61～1．14）g／L，女0．82（0．56～1．15）g／L；apoB／apoA1男0．61（0．42～0．84），女0．56（0．36～0．83）。结论该参考值基本能够反映深圳市健康成人血清apoA1和B的水平。     

Pediatric reference intervals for lipids and apolipoproteins on the VITROS 5,1 FS Chemistry System

OBJECTIVES: Lipid biomarkers are integral in the assessment of dyslipidemia and cardiovascular risk, conditions that have become increasingly prevalent in pediatric populations. A comprehensive set of pediatric reference intervals for traditional or recently established lipid analytes is not currently available. DESIGN AND METHODS: 525 outpatient samples from a pediatric population were categorized into five age groups ranging from 0 to 20 years of age. Groups were further partitioned by gender. Serum or plasma samples were analyzed on the VITROS 5,1 FS Chemistry System for cholesterol and triglycerides by dry-film methods, direct HDL-C and LDL-C by selective detergent elimination, and apolipoproteins AI and B by immunoturbidimetry. Reference intervals were established by non-parametric methods at the 2.5th and 97.5th percentiles. RESULTS: Lipid levels show age- and gender-related differences, particularly during the first year of life and in young adults following puberty. Concentrations of total cholesterol, LDL-C, and apo B were lowest in the 12 months after birth and remained relatively constant throughout childhood, but decreased for males in early adulthood. Triglyceride levels increased gradually throughout childhood and adolescence, and along with cholesterol, the upper limits of these intervals exceeded the recommended concentrations of lipid levels in children. For HDL-C and apo AI, no age- or sex-related differences were found until after puberty when values for males decreased slightly. CONCLUSIONS: Our current reference intervals in children and adolescents provide an important update for lipid markers and suggest earlier incidence of hypercholesterolemia when compared to previous ranges. Increased profiling of lipids is anticipated, and these will aid in the early assessment of cardiovascular risk in pediatric populations.     

Protein standardization IV: Value transfer procedure for the assignment of serum protein values from a reference preparation to a target material.

A new approach for the assignment of values to serum proteins in a target material using a reference preparation has been developed. The procedure describes the general as well as the practical principles involved in the value assignment (with examples). Two models have been developed: 1) The direct value transfer between serum matrices and 2) the indirect value transfer from a pure protein preparation to a serum protein material. The necessary mathematical equations are developed and explained. The data reduction and statistical evaluation are discussed. The practical procedure (the transfer protocol) is based on six dilutions of the reference preparation assayed together with six dilutions of the target material. In this way imprecision is reduced and the proportionality of the two materials (i.e. the presence or absence of matrix effects) can be assessed directly by evaluating a single regression plot. If no matrix effects are found, the regression line will pass through zero with a slope equal to the ratio of the concentrations of the two materials. The transfer protocol is based on a multiple point value assignment obtained by several measurements a day repeated on several days, an important prerequisite being that all reconstitutions and dilutions are controlled by weighing.     

Polymorphism of apolipoprotein E influences levels of serum apolipoproteins E and B in the human neonate

To gain more insight into the genetic vs. environmental influence of the apoE phenotypes on plasma lipoprotein variation we studied human umbilical cord sera at birth. Apolipoprotein E genetic phenotypes were determined in 110 individuals by immunoblotting and shown to be identical to the adult human isoforms with six phenotypes present and occurring at a similar frequency as reported previously for the adult population in the same area. Total serum cholesterol and triglyceride levels were low in the neonates and did not differ significantly between apoE phenotypes. On the other hand as in the adult, levels of apoE and B differed significantly between the phenotypes. ApoE was highest in individuals with the epsilon 2 allele and lowest in individuals expressing apoE4, and vice versa for apoB. We conclude that apoE phenotypes in human umbilical cord blood serum are already associated with pronounced differences in apoE and B levels in the newborn. The study demonstrates that the association of apoE and apoB levels with the apoE polymorphism occurs independently of significant enteral nutrition in the relatively constant in utero environment.     

APOA1/C3/A5 haplotype and risk of hypertriglyceridemia in Taiwanese

BACKGROUND: Apolipoprotein A5 gene (APOA5) has been shown to modulate plasma triglyceride concentrations. We investigated 2 distinct APOA1/C3/A5 haplotypes roles for hypertriglyceridemia. METHODS: We recruited 308 cases of hypertriglyceridemia and 281 normal controls from a hospital. Twelve single nucleotide polymorphisms (SNPs) across the APOA1/C3/A5 gene region were genotyped. RESULTS: One haplotype containing the minor alleles of the APOA5 (-1131T>C, c.553G>T) and APOA1 (-3013C>T,-75G>A) was more prevalent in cases than in controls (11.3% vs. 1.1%, respectively) and was statistically significantly associated with high triglycerides (adjusted odds ratio: 12.83, 95% confidence interval [CI]: 5.1-32.4, P<0.001). Another haplotype that was associated with hypertriglyceridemia (adjusted odds ratio 2.13, 95% CI, 1.37-3.29, P=0.001). Participants carrying both minor alleles of APOA5-1131CC and c.553TT had a 116% higher triglyceride concentration compared with those carrying common allele. CONCLUSIONS: The APOA1/C3/A5 haplotype represents an important locus for predicting risk of hypertriglyceridemia among Taiwanese.     

南宁地区健康成人HbA2和HbA参考范围调查

目的 建立广西南宁地区健康成人血红蛋白(Hb)A2和HbA参考范围.方法 采用Capillarys2毛细管电泳仪检测810例健康成人Hb,以95%参考区间(x±1.96s)建立参考范围.随机选择112例受试对象进行验证试验.结果 男、女HbA2检测结果分别为(2.79±0.24)%和(2.70±0.23)%,组间比较差异有统计学意义(P＜0.01);HbA检测结果分别为(97.14±0.28)%和(97.17±0.39)%,组间比较差异无统计学意义(P＞0.05).不同年龄组HbA2和HbA检测结果差异无统计学意义(P>0.05).HbA2和HbA参考范围分别为2.3%～3.3%、96.4%～97.9%.112例验证标本中,仅1例结果不适于该参考范围.结论 本研究建立的参考范围适用于该地区绝大部分健康成人.