目的探讨2型糖尿病(T2DM)患者血清血管生成抑制蛋白-1(VASH-1)、金属蛋白酶组织抑制物1(TIMP-1)与糖尿病视网膜病变的关系。方法选取2020年1月至2021年1月陕西省商洛眼科医院收治的79例T2DM患者作为研究对象。根据眼底荧光血管造影结果...目的探讨2型糖尿病(T2DM)患者血清血管生成抑制蛋白-1(VASH-1)、金属蛋白酶组织抑制物1(TIMP-1)与糖尿病视网膜病变的关系。方法选取2020年1月至2021年1月陕西省商洛眼科医院收治的79例T2DM患者作为研究对象。根据眼底荧光血管造影结果将患者分为无视网膜病变组、视网膜病变组。另选取40例同期健康体检者作为对照组。采用酶联免疫吸附试验检测血清VASH-1、TIMP-1水平。绘制受试者工作特征(ROC)曲线评估血清VASH-1、TIMP-1水平对T2DM患者发生视网膜病变的预测价值。采用多因素Logistic回归分析T2DM患者发生视网膜病变的危险因素。结果无视网膜病变组纳入45例患者、视网膜病变组纳入34例患者。无视网膜病变组与视网膜病变组FPG、2 h PG、HbA1c、UACR水平均高于对照组,且视网膜病变组均高于无视网膜病变组,差异均有统计学意义(P<0.05)。视网膜病变组T2DM病程长于无视网膜病变组,差异有统计学意义(P<0.05)。无视网膜病变组与视网膜病变组血清VASH-1水平均高于对照组,TIMP-1水平均低于对照组,且视网膜病变组血清VASH-1水平高于无视网膜病变组,视网膜病变组血清TIMP-1水平低于无视网膜病变组,差异均有统计学意义(P<0.05)。ROC曲线分析结果显示,血清VASH-1、TIMP-1预测T2DM患者发生视网膜病变的曲线下面积分别为0.807、0.847。多因素Logistic回归分析结果显示,病程长、血清VASH-1高水平、TIMP-1低水平为T2DM患者发生视网膜病变的危险因素(P<0.05)。结论发生视网膜病变的T2DM患者血清VASH-1水平升高、TIMP-1水平降低。血清VASH-1、TIMP-1为T2DM患者发生视网膜病变的影响因素,二者有望作为临床诊治T2DM患者发生视网膜病变的生物标志物。展开更多
The retina is one of the most energy demanding tissues in the body. Like most neurons in the central nervous system, retinal neurons consume high amounts of adenosine-5′-triphosphate（ATP） to generate visual signal ...The retina is one of the most energy demanding tissues in the body. Like most neurons in the central nervous system, retinal neurons consume high amounts of adenosine-5′-triphosphate（ATP） to generate visual signal and transmit the information to the brain. Disruptions in retinal metabolism can cause neuronal dysfunction and degeneration resulting in severe visual impairment and even blindness. The homeostasis of retinal metabolism is tightly controlled by multiple signaling pathways, such as the unfolded protein response（UPR）, and the close interactions between retinal neurons and other retinal cell types including vascular cells and Müller glia. The UPR is a highly conserved adaptive cellular response and can be triggered by many physiological stressors and pathophysiological conditions. Activation of the UPR leads to changes in glycolytic rate, ATP production, de novo serine synthesis, and the hexosamine biosynthetic pathway, which are considered critical components of Müller glia metabolism and provide metabolic support to surrounding neurons. When these pathways are disrupted, neurodegeneration occurs rapidly. In this review, we summarize recent advance in studies of the UPR in Müller glia and highlight the potential role of the UPR in retinal degeneration through regulation of Müller glia metabolism.展开更多
Axonal growth inhibitors are released during traumatic injuries to the adult mammalian central nervous system, including after spinal cord injury. These molecules accumulate at the injury site and form a highly inhibi...Axonal growth inhibitors are released during traumatic injuries to the adult mammalian central nervous system, including after spinal cord injury. These molecules accumulate at the injury site and form a highly inhibitory environment for axonal regeneration. Among these inhibitory molecules, myelinassociated inhibitors, including neurite outgrowth inhibitor A, oligodendrocyte myelin glycoprotein, myelin-associated glycoprotein, chondroitin sulfate proteoglycans and repulsive guidance molecule A are of particular importance. Due to their inhibitory nature, they represent exciting molecular targets to study axonal inhibition and regeneration after central injuries. These molecules are mainly produced by neurons, oligodendrocytes, and astrocytes within the scar and in its immediate vicinity. They exert their effects by binding to specific receptors, localized in the membranes of neurons. Receptors for these inhibitory cues include Nogo receptor 1, leucine-rich repeat, and Ig domain containing 1 and p75 neurotrophin receptor/tumor necrosis factor receptor superfamily member 19(that form a receptor complex that binds all myelin-associated inhibitors), and also paired immunoglobulin-like receptor B. Chondroitin sulfate proteoglycans and repulsive guidance molecule A bind to Nogo receptor 1, Nogo receptor 3, receptor protein tyrosine phosphatase σ and leucocyte common antigen related phosphatase, and neogenin, respectively. Once activated, these receptors initiate downstream signaling pathways, the most common amongst them being the Rho A/ROCK signaling pathway. These signaling cascades result in actin depolymerization, neurite outgrowth inhibition, and failure to regenerate after spinal cord injury. Currently, there are no approved pharmacological treatments to overcome spinal cord injuries other than physical rehabilitation and management of the array of symptoms brought on by spinal cord injuries. However, several novel therapies aiming to modulate these inhibitory proteins and/or their receptors are under investigation in ongoing clinical trials. Investigation has also been demonstrating that combinatorial therapies of growth inhibitors with other therapies, such as growth factors or stem-cell therapies, produce stronger results and their potential application in the clinics opens new venues in spinal cord injury treatment.展开更多
寡肽转运蛋白1(oligopeptide transporter 1,PepT1;solute carrier family 15 member 1,SLC15A1)是一种主要存在于小肠上皮细胞的质子依赖型转运蛋白质,转运底物主要为蛋白质水解产物中的二肽、三肽以及与二肽、三肽结构类似的一些化合...寡肽转运蛋白1(oligopeptide transporter 1,PepT1;solute carrier family 15 member 1,SLC15A1)是一种主要存在于小肠上皮细胞的质子依赖型转运蛋白质,转运底物主要为蛋白质水解产物中的二肽、三肽以及与二肽、三肽结构类似的一些化合物。PepT1的研究有助于促进药物生物利用度的提高,对于肿瘤的治疗也具有十分重要的意义。现主要从PepT1的晶体结构、靶向前药、转运底物、相互作用的蛋白质及PepT1的疾病应答机制等几方面展开综述。展开更多
文摘目的探讨2型糖尿病(T2DM)患者血清血管生成抑制蛋白-1(VASH-1)、金属蛋白酶组织抑制物1(TIMP-1)与糖尿病视网膜病变的关系。方法选取2020年1月至2021年1月陕西省商洛眼科医院收治的79例T2DM患者作为研究对象。根据眼底荧光血管造影结果将患者分为无视网膜病变组、视网膜病变组。另选取40例同期健康体检者作为对照组。采用酶联免疫吸附试验检测血清VASH-1、TIMP-1水平。绘制受试者工作特征(ROC)曲线评估血清VASH-1、TIMP-1水平对T2DM患者发生视网膜病变的预测价值。采用多因素Logistic回归分析T2DM患者发生视网膜病变的危险因素。结果无视网膜病变组纳入45例患者、视网膜病变组纳入34例患者。无视网膜病变组与视网膜病变组FPG、2 h PG、HbA1c、UACR水平均高于对照组,且视网膜病变组均高于无视网膜病变组,差异均有统计学意义(P<0.05)。视网膜病变组T2DM病程长于无视网膜病变组,差异有统计学意义(P<0.05)。无视网膜病变组与视网膜病变组血清VASH-1水平均高于对照组,TIMP-1水平均低于对照组,且视网膜病变组血清VASH-1水平高于无视网膜病变组,视网膜病变组血清TIMP-1水平低于无视网膜病变组,差异均有统计学意义(P<0.05)。ROC曲线分析结果显示,血清VASH-1、TIMP-1预测T2DM患者发生视网膜病变的曲线下面积分别为0.807、0.847。多因素Logistic回归分析结果显示,病程长、血清VASH-1高水平、TIMP-1低水平为T2DM患者发生视网膜病变的危险因素(P<0.05)。结论发生视网膜病变的T2DM患者血清VASH-1水平升高、TIMP-1水平降低。血清VASH-1、TIMP-1为T2DM患者发生视网膜病变的影响因素,二者有望作为临床诊治T2DM患者发生视网膜病变的生物标志物。
基金supported,in part,by NIH/NEI grants EY019949 and EY025061an Unrestricted Grant to the Department of Ophthalmology,SUNY-Buffalo,from Research to Prevent Blindness
文摘The retina is one of the most energy demanding tissues in the body. Like most neurons in the central nervous system, retinal neurons consume high amounts of adenosine-5′-triphosphate（ATP） to generate visual signal and transmit the information to the brain. Disruptions in retinal metabolism can cause neuronal dysfunction and degeneration resulting in severe visual impairment and even blindness. The homeostasis of retinal metabolism is tightly controlled by multiple signaling pathways, such as the unfolded protein response（UPR）, and the close interactions between retinal neurons and other retinal cell types including vascular cells and Müller glia. The UPR is a highly conserved adaptive cellular response and can be triggered by many physiological stressors and pathophysiological conditions. Activation of the UPR leads to changes in glycolytic rate, ATP production, de novo serine synthesis, and the hexosamine biosynthetic pathway, which are considered critical components of Müller glia metabolism and provide metabolic support to surrounding neurons. When these pathways are disrupted, neurodegeneration occurs rapidly. In this review, we summarize recent advance in studies of the UPR in Müller glia and highlight the potential role of the UPR in retinal degeneration through regulation of Müller glia metabolism.
基金a Ph D fellowship by FCT-Fundacao para a Ciência Tecnologia (SFRH/BD/135868/2018)(to SSC)。
文摘Axonal growth inhibitors are released during traumatic injuries to the adult mammalian central nervous system, including after spinal cord injury. These molecules accumulate at the injury site and form a highly inhibitory environment for axonal regeneration. Among these inhibitory molecules, myelinassociated inhibitors, including neurite outgrowth inhibitor A, oligodendrocyte myelin glycoprotein, myelin-associated glycoprotein, chondroitin sulfate proteoglycans and repulsive guidance molecule A are of particular importance. Due to their inhibitory nature, they represent exciting molecular targets to study axonal inhibition and regeneration after central injuries. These molecules are mainly produced by neurons, oligodendrocytes, and astrocytes within the scar and in its immediate vicinity. They exert their effects by binding to specific receptors, localized in the membranes of neurons. Receptors for these inhibitory cues include Nogo receptor 1, leucine-rich repeat, and Ig domain containing 1 and p75 neurotrophin receptor/tumor necrosis factor receptor superfamily member 19(that form a receptor complex that binds all myelin-associated inhibitors), and also paired immunoglobulin-like receptor B. Chondroitin sulfate proteoglycans and repulsive guidance molecule A bind to Nogo receptor 1, Nogo receptor 3, receptor protein tyrosine phosphatase σ and leucocyte common antigen related phosphatase, and neogenin, respectively. Once activated, these receptors initiate downstream signaling pathways, the most common amongst them being the Rho A/ROCK signaling pathway. These signaling cascades result in actin depolymerization, neurite outgrowth inhibition, and failure to regenerate after spinal cord injury. Currently, there are no approved pharmacological treatments to overcome spinal cord injuries other than physical rehabilitation and management of the array of symptoms brought on by spinal cord injuries. However, several novel therapies aiming to modulate these inhibitory proteins and/or their receptors are under investigation in ongoing clinical trials. Investigation has also been demonstrating that combinatorial therapies of growth inhibitors with other therapies, such as growth factors or stem-cell therapies, produce stronger results and their potential application in the clinics opens new venues in spinal cord injury treatment.
文摘寡肽转运蛋白1(oligopeptide transporter 1,PepT1;solute carrier family 15 member 1,SLC15A1)是一种主要存在于小肠上皮细胞的质子依赖型转运蛋白质,转运底物主要为蛋白质水解产物中的二肽、三肽以及与二肽、三肽结构类似的一些化合物。PepT1的研究有助于促进药物生物利用度的提高,对于肿瘤的治疗也具有十分重要的意义。现主要从PepT1的晶体结构、靶向前药、转运底物、相互作用的蛋白质及PepT1的疾病应答机制等几方面展开综述。
