The adenosine subfamily G protein-coupled receptors A_(2A)R and A_(2B)R have been identified as promising cancer immunotherapy candidates.One of the A_(2A)R/A_(2B)R dual antagonists,AB928,has progressed to a phaseⅡcl...The adenosine subfamily G protein-coupled receptors A_(2A)R and A_(2B)R have been identified as promising cancer immunotherapy candidates.One of the A_(2A)R/A_(2B)R dual antagonists,AB928,has progressed to a phaseⅡclinical trial to treat rectal cancer.However,the precise mechanism underlying its dual-antagonistic properties remains elusive.Herein,we report crystal structures of the A_(2A)R complexed with AB928 and a selective A_(2A)R antagonist 2-118.The structures revealed a common binding mode on A_(2A)R,wherein the ligands established extensive interactions with residues from the orthosteric and secondary pockets.In contrast,the cAMP assay and A_(2A)R and A_(2B)R molecular dynamics simulations indicated that the ligands adopted distinct binding modes on A_(2B)R.Detailed analysis of their chemical structures suggested that AB928 readily adapted to the A_(2B)R pocket,while 2-118 did not due to intrinsic differences.This disparity potentially accounted for the difference in inhibitory efficacy between A_(2B)R and A_(2A)R.This study serves as a valuable structural template for the future development of selective or dual inhibitors targeting A_(2A)R/A_(2B)R for cancer therapy.展开更多
目的通过检测降钙素基因相关肽(calcitonin gene related peptide,CGRP)及腺苷2A受体(adenosine 2Areceptor,A2AR)蛋白在偏头痛模型大鼠三叉神经组织中的表达,探讨CGRP和A2AR在大鼠偏头痛发病机制中的作用。方法将30只雄性Sprague-Dawle...目的通过检测降钙素基因相关肽(calcitonin gene related peptide,CGRP)及腺苷2A受体(adenosine 2Areceptor,A2AR)蛋白在偏头痛模型大鼠三叉神经组织中的表达,探讨CGRP和A2AR在大鼠偏头痛发病机制中的作用。方法将30只雄性Sprague-Dawley(SD)大鼠随机分为对照组和模型组,每组15只。模型组采用每周1次皮下注射硝酸甘油法建立无先兆性偏头痛模型,共5周;对照组则用生理盐水皮下注射代替硝酸甘油。对两组大鼠进行行为学评分,而后采集两组大鼠颅底三叉神经节,采用免疫组化法检测三叉神经节中CGRP的表达;采用免疫荧光检测法观察三叉神经节中A2AR表达;采用westernblot法检测A2AR蛋白表达量。结果三叉神经节组织HE染色结果:模型组和对照组均显示神经元与神经纤维分布正常、无紊乱,解剖结构完整,无异常改变。三叉神经节中A2AR蛋白表达的Western-blot量及灰度值测定结果:模型组A2AR蛋白表达量及灰度值高于对照组。差异均有统计学意义(P<0.01)。三叉神经组织中A2AR表达蛋白免疫荧光测定结果及A2AR阳性神经元细胞数:模型组中A2AR在三叉神经各神经元中的免疫荧光的表达分布明显多于对照组模型组。模型组表达A2AR的阳性神经元细胞数高于对照组,差异有统计学意义(P<0.01)。三叉神经节CGRP免疫组化表达水平及OD值结果:模型组CGRP及OD值的表达水平明显高于对照组,差异有统计学意义(P<0.01)。结论模型大鼠偏头痛发作时,三叉神经组织无解剖结构上的改变,大鼠行为学改变与三叉神经功能异常有关。A2AR的激活或蛋白上调,CGRP的大量释放。A2AR、CGRP可能在偏头痛的发作中起重要作用。展开更多
OBJECTIVE The high prevalence of sleep disturbance has been found in patients with striatum-related neurodegenerative disorders.In the striatum,there are abundant adenosine A2A receptors(A2ARs)whichhavebeen reported t...OBJECTIVE The high prevalence of sleep disturbance has been found in patients with striatum-related neurodegenerative disorders.In the striatum,there are abundant adenosine A2A receptors(A2ARs)whichhavebeen reported to mediatesleepbehavior for adenosine.We hypothesized that the A2AR-expressing neurons in the striatum are involved in sleep-wake regulation.METHODS We employed a chemogenetic technique,designer receptor exclusively activated by designer drug(DREADD),to specifically and non-invasively manipulate the neuron activity based on the principle of Cre/Lox P recombination,EEG/electromyogram recording for sleep-wake behaviors,the neural tracing approach toselectively visualize the perikarya of A2AR-expressing neurons and their axons by adeno-associated virus(AAV)encoding humanized Renilla green fluorescent(hr GFP)as a tracerin A2AR-Cre mice.In addition,we used immunoelectron microscopy,patch-clamp technique,and optogenetics in A2AR-Cre mice to selectively characterize the synapse and functional connectivity between the A2AR-expressing neurons and the neuron of their downstream targets in vitro.RESULTS The activation of A2AR-expressing neurons in rostral,centromedial and centrolateral striatum increased non-rapid eye movement(non-REM,NREM)sleep,concomitant with a reduction in wakefulness,whereas the activation of A2AR-expressing neurons in caudal striatum didn′t alter sleep-wake profiles at all.Topographical projections in the sagittal section showed that the axons of A2ARexpressing neurons from rostral striatum distributed in the rostral external globuspallidus(GPe)with a discoidal region paralleled to the striato-pallidal border,while the axons of the A2AR-expressing neurons from the central striatum not only distributed in the rostral GPe,but also in the caudal GPe with a similar distributing pattern as did in rostral neurons.However,the axons of A2ARexpressing neurons from caudal striatum just scattered in the caudal GPe.Based on our anatomical findings and patch-clamp technique combining with optogenetic展开更多
基金supported by the National Key Research and Development Program of China(2018YFA0507001)the Basic Research Program of Science and Technology Commission of Shanghai Municipality(21JC1402400)+1 种基金the National Natural Science Foundation of China(32171215,81972828,82172644,82273857 and 81830083)the National Key Scientific Infrastructure for Translational Medicine(Shanghai)(TMSK-2021-120)。
文摘The adenosine subfamily G protein-coupled receptors A_(2A)R and A_(2B)R have been identified as promising cancer immunotherapy candidates.One of the A_(2A)R/A_(2B)R dual antagonists,AB928,has progressed to a phaseⅡclinical trial to treat rectal cancer.However,the precise mechanism underlying its dual-antagonistic properties remains elusive.Herein,we report crystal structures of the A_(2A)R complexed with AB928 and a selective A_(2A)R antagonist 2-118.The structures revealed a common binding mode on A_(2A)R,wherein the ligands established extensive interactions with residues from the orthosteric and secondary pockets.In contrast,the cAMP assay and A_(2A)R and A_(2B)R molecular dynamics simulations indicated that the ligands adopted distinct binding modes on A_(2B)R.Detailed analysis of their chemical structures suggested that AB928 readily adapted to the A_(2B)R pocket,while 2-118 did not due to intrinsic differences.This disparity potentially accounted for the difference in inhibitory efficacy between A_(2B)R and A_(2A)R.This study serves as a valuable structural template for the future development of selective or dual inhibitors targeting A_(2A)R/A_(2B)R for cancer therapy.
文摘目的通过检测降钙素基因相关肽(calcitonin gene related peptide,CGRP)及腺苷2A受体(adenosine 2Areceptor,A2AR)蛋白在偏头痛模型大鼠三叉神经组织中的表达,探讨CGRP和A2AR在大鼠偏头痛发病机制中的作用。方法将30只雄性Sprague-Dawley(SD)大鼠随机分为对照组和模型组,每组15只。模型组采用每周1次皮下注射硝酸甘油法建立无先兆性偏头痛模型,共5周;对照组则用生理盐水皮下注射代替硝酸甘油。对两组大鼠进行行为学评分,而后采集两组大鼠颅底三叉神经节,采用免疫组化法检测三叉神经节中CGRP的表达;采用免疫荧光检测法观察三叉神经节中A2AR表达;采用westernblot法检测A2AR蛋白表达量。结果三叉神经节组织HE染色结果:模型组和对照组均显示神经元与神经纤维分布正常、无紊乱,解剖结构完整,无异常改变。三叉神经节中A2AR蛋白表达的Western-blot量及灰度值测定结果:模型组A2AR蛋白表达量及灰度值高于对照组。差异均有统计学意义(P<0.01)。三叉神经组织中A2AR表达蛋白免疫荧光测定结果及A2AR阳性神经元细胞数:模型组中A2AR在三叉神经各神经元中的免疫荧光的表达分布明显多于对照组模型组。模型组表达A2AR的阳性神经元细胞数高于对照组,差异有统计学意义(P<0.01)。三叉神经节CGRP免疫组化表达水平及OD值结果:模型组CGRP及OD值的表达水平明显高于对照组,差异有统计学意义(P<0.01)。结论模型大鼠偏头痛发作时,三叉神经组织无解剖结构上的改变,大鼠行为学改变与三叉神经功能异常有关。A2AR的激活或蛋白上调,CGRP的大量释放。A2AR、CGRP可能在偏头痛的发作中起重要作用。
基金The project supported by National Basic Research Program of China(2015CB856401)
文摘OBJECTIVE The high prevalence of sleep disturbance has been found in patients with striatum-related neurodegenerative disorders.In the striatum,there are abundant adenosine A2A receptors(A2ARs)whichhavebeen reported to mediatesleepbehavior for adenosine.We hypothesized that the A2AR-expressing neurons in the striatum are involved in sleep-wake regulation.METHODS We employed a chemogenetic technique,designer receptor exclusively activated by designer drug(DREADD),to specifically and non-invasively manipulate the neuron activity based on the principle of Cre/Lox P recombination,EEG/electromyogram recording for sleep-wake behaviors,the neural tracing approach toselectively visualize the perikarya of A2AR-expressing neurons and their axons by adeno-associated virus(AAV)encoding humanized Renilla green fluorescent(hr GFP)as a tracerin A2AR-Cre mice.In addition,we used immunoelectron microscopy,patch-clamp technique,and optogenetics in A2AR-Cre mice to selectively characterize the synapse and functional connectivity between the A2AR-expressing neurons and the neuron of their downstream targets in vitro.RESULTS The activation of A2AR-expressing neurons in rostral,centromedial and centrolateral striatum increased non-rapid eye movement(non-REM,NREM)sleep,concomitant with a reduction in wakefulness,whereas the activation of A2AR-expressing neurons in caudal striatum didn′t alter sleep-wake profiles at all.Topographical projections in the sagittal section showed that the axons of A2ARexpressing neurons from rostral striatum distributed in the rostral external globuspallidus(GPe)with a discoidal region paralleled to the striato-pallidal border,while the axons of the A2AR-expressing neurons from the central striatum not only distributed in the rostral GPe,but also in the caudal GPe with a similar distributing pattern as did in rostral neurons.However,the axons of A2ARexpressing neurons from caudal striatum just scattered in the caudal GPe.Based on our anatomical findings and patch-clamp technique combining with optogenetic
