目的:研究肥胖小鼠及正常小鼠不同周龄下丘脑组织SH2B1(adapter protein with a Src-homology 2 domain),细胞因子信号转导抑制蛋白3(the suppressor of cytokine signaling-3,SOCS3),蛋白质酪氨酸磷酸酶1B(proteintyrosine phosphatase...目的:研究肥胖小鼠及正常小鼠不同周龄下丘脑组织SH2B1(adapter protein with a Src-homology 2 domain),细胞因子信号转导抑制蛋白3(the suppressor of cytokine signaling-3,SOCS3),蛋白质酪氨酸磷酸酶1B(proteintyrosine phosphatase 1B,PTP1B)和神经肽Y(neturopetide Y,NPY)表达的变化规律及其与血清瘦素及胰岛素水平的关系。方法:选用健康C57BL/6乳鼠制作肥胖动物模型,计算Lee’s指数及稳态模型胰岛素抵抗指数。荧光定量RT-PCR法检测下丘脑SH2B1,SOCS3及PTP1B mRNA表达量,Western印迹检测下丘脑SH2B1和NPY蛋白表达量。结果:与同周龄对照组小鼠相比,肥胖组小鼠下丘脑组织SH2B1 mRNA表达减少,SOCS3及PTP1B mRNA表达增加;Western印迹结果显示:肥胖组小鼠SH2B1蛋白表达水平较对照组下降,NPY表达升高。直线相关分析显示:血清瘦素和血清空腹胰岛素水平与SH2B1 mRNA表达呈负相关,与SOCS3及PTP1B mRNA表达正相关。结论:SH2B1,SOCS3,PTP1B及NPY是肥胖发生、发展过程中的关键因子。展开更多
本试验旨在研究SH2B衔接因子蛋白1(SH2B adaptor protein 1,SH2B1)基因在猪不同组织和生长发育各阶段背部脂肪中的表达情况,预测调控该基因的miR-276-3p对猪背部脂肪表达的影响。应用实时荧光定量PCR技术检测SH2B1基因在猪脂肪、下丘脑...本试验旨在研究SH2B衔接因子蛋白1(SH2B adaptor protein 1,SH2B1)基因在猪不同组织和生长发育各阶段背部脂肪中的表达情况,预测调控该基因的miR-276-3p对猪背部脂肪表达的影响。应用实时荧光定量PCR技术检测SH2B1基因在猪脂肪、下丘脑等6种组织,以及在30、60、90、120和180 d猪背部脂肪组织中的相对表达量。靶标预测SH2B1基因的调控miRNA,并通过实时荧光定量PCR检测miR-276-3p对该基因的调控作用。结果显示,SH2B1基因在猪的6种组织中均有表达,且在脂肪组织中表达量最高,在肌肉组织中表达量最低。在猪生长发育各阶段背部脂肪中SH2B1基因均有表达,在前期(30和60 d)表达量较低,在中、后期(90、120和180 d)持续高表达,且显著高于前期表达量(P<0.05)。高、低背膘厚组背部脂肪中miR-276-3p与SH2B1基因均呈差异表达,且两者表达呈相反趋势,miR-276-3p在高背膘厚组中的表达量显著低于低背膘厚组(P<0.05),而SH2B1基因在高背膘厚组中的表达量却显著高于低背膘厚组(P<0.05)。miR-276-3p可通过靶向负调控SH2B1基因,影响猪背部脂肪的沉积。本试验结果为进一步深入研究猪背部脂肪沉积和背膘厚差异的分子机制提供参考。展开更多
Genetic linkage analyses, genome-wide association studies of single nucleotide polymorphisms, copy number variation surveys, and mutation screenings found the human chromosomal 12q24 locus, with the genes SH2B3 and AT...Genetic linkage analyses, genome-wide association studies of single nucleotide polymorphisms, copy number variation surveys, and mutation screenings found the human chromosomal 12q24 locus, with the genes SH2B3 and ATXN2 in its core, to be associated with an exceptionally wide spectrum of disease susceptibilities. Hematopoietic traits of red and white blood cells(like erythrocytosis and myeloproliferative disease), autoimmune disorders(like type 1 diabetes, coeliac disease, juvenile idiopathic arthritis, rheumatoid arthritis, thrombotic antiphospholipid syndrome, lupus erythematosus, multiple sclerosis, hypothyroidism and vitiligo), also vascular pathology(like kidney glomerular filtration rate deficits, serum urate levels, plasma beta-2-microglobulin levels, retinal microcirculation problems, diastolic and systolic blood pressure and hypertension, cardiovascular infarction), furthermore obesity, neurodegenerative conditions(like the polyglutamine-expansion disorder spinocerebellar ataxia type 2, Parkinson's disease, the motor-neuron disease amyotrophic lateral sclerosis, and progressive supranuclear palsy), andfinally longevity were reported. Now it is important to clarify, in which ways the loss or gain of function of the locally encoded proteins SH2B3/LNK and ataxin-2, respectively, contribute to these polygenic health problems. SH2B3/LNK is known to repress the JAK2/ABL1 dependent proliferation of white blood cells. Its null mutations in human and mouse are triggers of autoimmune traits and leukemia(acute lymphoblastic leukemia or chronic myeloid leukemia-like), while missense mutations were found in erythrocytosis-1 patients. Ataxin-2 is known to act on RNA-processing and trophic receptor internalization. While its polyglutamine-expansion mediated gain-of-function causes neuronal atrophy in human and mouse, its deletion leads to obesity and insulin resistance in mice. Thus, it is conceivable that the polygenic pathogenesis of type 1 diabetes is enhanced by an SH2B3-dysregulation-mediated predisposition to autoimmune diseases that conspires with an ATXN2-deficiency-mediated predisposition to lipid and glucose metabolism pathology.展开更多
文摘目的:研究肥胖小鼠及正常小鼠不同周龄下丘脑组织SH2B1(adapter protein with a Src-homology 2 domain),细胞因子信号转导抑制蛋白3(the suppressor of cytokine signaling-3,SOCS3),蛋白质酪氨酸磷酸酶1B(proteintyrosine phosphatase 1B,PTP1B)和神经肽Y(neturopetide Y,NPY)表达的变化规律及其与血清瘦素及胰岛素水平的关系。方法:选用健康C57BL/6乳鼠制作肥胖动物模型,计算Lee’s指数及稳态模型胰岛素抵抗指数。荧光定量RT-PCR法检测下丘脑SH2B1,SOCS3及PTP1B mRNA表达量,Western印迹检测下丘脑SH2B1和NPY蛋白表达量。结果:与同周龄对照组小鼠相比,肥胖组小鼠下丘脑组织SH2B1 mRNA表达减少,SOCS3及PTP1B mRNA表达增加;Western印迹结果显示:肥胖组小鼠SH2B1蛋白表达水平较对照组下降,NPY表达升高。直线相关分析显示:血清瘦素和血清空腹胰岛素水平与SH2B1 mRNA表达呈负相关,与SOCS3及PTP1B mRNA表达正相关。结论:SH2B1,SOCS3,PTP1B及NPY是肥胖发生、发展过程中的关键因子。
文摘Genetic linkage analyses, genome-wide association studies of single nucleotide polymorphisms, copy number variation surveys, and mutation screenings found the human chromosomal 12q24 locus, with the genes SH2B3 and ATXN2 in its core, to be associated with an exceptionally wide spectrum of disease susceptibilities. Hematopoietic traits of red and white blood cells(like erythrocytosis and myeloproliferative disease), autoimmune disorders(like type 1 diabetes, coeliac disease, juvenile idiopathic arthritis, rheumatoid arthritis, thrombotic antiphospholipid syndrome, lupus erythematosus, multiple sclerosis, hypothyroidism and vitiligo), also vascular pathology(like kidney glomerular filtration rate deficits, serum urate levels, plasma beta-2-microglobulin levels, retinal microcirculation problems, diastolic and systolic blood pressure and hypertension, cardiovascular infarction), furthermore obesity, neurodegenerative conditions(like the polyglutamine-expansion disorder spinocerebellar ataxia type 2, Parkinson's disease, the motor-neuron disease amyotrophic lateral sclerosis, and progressive supranuclear palsy), andfinally longevity were reported. Now it is important to clarify, in which ways the loss or gain of function of the locally encoded proteins SH2B3/LNK and ataxin-2, respectively, contribute to these polygenic health problems. SH2B3/LNK is known to repress the JAK2/ABL1 dependent proliferation of white blood cells. Its null mutations in human and mouse are triggers of autoimmune traits and leukemia(acute lymphoblastic leukemia or chronic myeloid leukemia-like), while missense mutations were found in erythrocytosis-1 patients. Ataxin-2 is known to act on RNA-processing and trophic receptor internalization. While its polyglutamine-expansion mediated gain-of-function causes neuronal atrophy in human and mouse, its deletion leads to obesity and insulin resistance in mice. Thus, it is conceivable that the polygenic pathogenesis of type 1 diabetes is enhanced by an SH2B3-dysregulation-mediated predisposition to autoimmune diseases that conspires with an ATXN2-deficiency-mediated predisposition to lipid and glucose metabolism pathology.
