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妊娠期低水平铅暴露对新生儿血清钙、骨钙素及骨碱性磷酸酶的影响 被引量:5
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作者 蔺建英 王文英 《临床儿科杂志》 CAS CSCD 北大核心 2011年第3期222-224,共3页
目的研究妊娠期低水平铅暴露对新生儿血清钙(Ca)、骨钙素(OC)及骨碱性磷酸酶(BALP)的影响。方法于新生儿娩出断脐后采集脐静脉血5 ml分别检测血铅、血清钙、血清骨钙素及骨碱性磷酸酶,将新生儿以血铅值50μg/L、100μg/L为界分为低铅组(... 目的研究妊娠期低水平铅暴露对新生儿血清钙(Ca)、骨钙素(OC)及骨碱性磷酸酶(BALP)的影响。方法于新生儿娩出断脐后采集脐静脉血5 ml分别检测血铅、血清钙、血清骨钙素及骨碱性磷酸酶,将新生儿以血铅值50μg/L、100μg/L为界分为低铅组(<50μg/L)、相对高铅组(50~99μg/L)和高铅组(≥100μg/L),研究脐血铅对新生儿骨代谢相关指标的影响。结果新生儿脐血铅水平与其血清骨钙素、血清钙水平呈负相关,与骨碱性磷酸酶水平呈正相关。高铅组与低铅组比较,血清骨钙素水平、血清钙几何均数水平显著降低;高铅组碱性磷酸酶水平显著高于相对高铅组及低铅组。结论妊娠期低水平铅暴露可能干扰了新生儿骨代谢。 展开更多
关键词 新生儿 骨钙素 骨碱性磷酸酶
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真核细胞翻译启动因子2B与白质消融性白质脑病
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作者 潘艳霞 吴晔 +1 位作者 牛争平 姜玉武 《北京大学学报(医学版)》 CAS CSCD 北大核心 2009年第5期608-610,共3页
Leukoencephalopathy with vanishing white matter(VWM) is one of the most prevalent inherited white matter disorders in childhood,and it′s the only known hereditary human disease due to the direct defects in protein sy... Leukoencephalopathy with vanishing white matter(VWM) is one of the most prevalent inherited white matter disorders in childhood,and it′s the only known hereditary human disease due to the direct defects in protein synthesis process,with the gene defects in EIF2B1-5,encoding the five subunits of eukaryotic translation initiation factor(eIF2B α,β,γ,δ and ε) respectively.eIF2B is essential for the protein translation initiation process,and its action is realized via eukaryotic translation initiation factor2(eIF2).Phosphorylation of eIF2α and eIF2Bε is an important way to regulate eIF2B function,and thus play a key role in control of the protein translation level under physiological condition.Mutant eIF2B results in functional defects and decrease of the overall protein translation in cells,but in increase the translation of proteins with multiple upstream open reading frames,such as activating transcription factor 4(AFT4),which leads to the susceptibility to un-folded protein response under stress,and the following apoptosis.The exact pathogenic mechanisms of VWM are far from well understood.It′s suggested that level of AFT4 in cells with eIF2B mutations is higher than in wild type cells under physiological condition,which makes the mutant cells more susceptible to endoplasmic reticulum(ER) stress and unfolded protein response(UPR).Under stress,the defect eIF2B leads to a vicious cycle of UPR activation,which may underlie the neurological aggravation in VWM patients after minor stress,a specific cli-nical feature of VWM.Elucidating the pathogenesis of VWM will be helpful to further understand the protein translation process in eukaryotic cells,and provide a clue for possible therapeutic targets and treatment strategies in the future.Abstract:SUMM ARY Leukoencephalopathy with vanishing white matter(VWM) is one of the most prevalent in-herited white matter d isorders in childhood,and i′ts the only known hered itary human d isease due to the d irect defects in protein synthesis process,with the gene defects inEIF2B1-5,encod ing the five sub-units of eukaryotic translation initiation factor(eIF2Bα,β,γ,δandε) respectively.eIF2B is essential for the protein translation initiation process,and its action is realized via eukaryotic translation initiation factor2(eIF2).Phosphorylation of eIF2αand eIF2Bεis an important way to regulate eIF2B function,and thus play a key role in control of the protein translation level under physiological cond ition.Mutant eIF2B results in functional defects and decrease of the overall protein translation in cells,but in increase the translation of proteins with multiple upstream open read ing frames,such as activating transcription factor 4(AFT4),which leads to the susceptibility to un-folded protein response under stress,and the following apoptosis.The exact pathogenic mechanisms ofVWM are far from well understood.I′ts sugges-ted that level ofAFT4 in cells with eIF2B mutations is higher than in wild type cells under physiological cond ition,which makes the mutant cellsmore susceptible to endoplasm ic reticulum(ER) stress and un-folded protein response(UPR).Under stress,the defect eIF2B leads to a vicious cycle ofUPR activa-tion,which may underlie the neurological aggravation in VWM patients afterm inor stress,a specific cli-nical feature ofVWM.E lucidating the pathogenesis ofVWM will be helpful to further understand the pro-tein translation process in eukaryotic cells,and provide a clue for possible therapeutic targets and treat-ment strategies in the future. 展开更多
关键词 白质消融性白质脑病 真核细胞起始因子 磷酰化 激活转录因子4
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