Protein O-GlcNAcylation is a post-translational modification that links environmental stimuli with changes in intracellular signal pathways,and its disturbance has been found in neurodegenerative diseases and metaboli...Protein O-GlcNAcylation is a post-translational modification that links environmental stimuli with changes in intracellular signal pathways,and its disturbance has been found in neurodegenerative diseases and metabolic disorders.However,its role in the mesolimbic dopamine(DA)system,especially in the ventral tegmental area(VTA),needs to be elucidated.Here,we found that injection of Thiamet G,an O-GlcNAcase(OGA)inhibitor,in the VTA and nucleus accumbens(NAc)of mice,facilitated neuronal O-GlcNAcylation and decreased the operant response to sucrose as well as the latency to fall in rotarod test.Mice with DAergic neuron-specific knockout of O-GlcNAc transferase(OGT)displayed severe metabolic abnormalities and died within 4–8 weeks after birth.Furthermore,mice specifically overexpressing OGT in DAergic neurons in the VTA had learning defects in the operant response to sucrose,and impaired motor learning in the rotarod test.Instead,overexpression of OGT in GABAergic neurons in the VTA had no effect on these behaviors.These results suggest that protein O-GlcNAcylation of DAergic neurons in the VTA plays an important role in regulating the response to natural reward and motor learning in mice.展开更多
基金the National Natural Science Foundation of China(31871021,82021002,31930046,and 32000671)the China Postdoctoral Science Foundation(2020M670978 and 2021T140127)the Shanghai Municipal Science and Technology Major Project(2018SHZDZX01),and ZhangJiang Lab.
文摘Protein O-GlcNAcylation is a post-translational modification that links environmental stimuli with changes in intracellular signal pathways,and its disturbance has been found in neurodegenerative diseases and metabolic disorders.However,its role in the mesolimbic dopamine(DA)system,especially in the ventral tegmental area(VTA),needs to be elucidated.Here,we found that injection of Thiamet G,an O-GlcNAcase(OGA)inhibitor,in the VTA and nucleus accumbens(NAc)of mice,facilitated neuronal O-GlcNAcylation and decreased the operant response to sucrose as well as the latency to fall in rotarod test.Mice with DAergic neuron-specific knockout of O-GlcNAc transferase(OGT)displayed severe metabolic abnormalities and died within 4–8 weeks after birth.Furthermore,mice specifically overexpressing OGT in DAergic neurons in the VTA had learning defects in the operant response to sucrose,and impaired motor learning in the rotarod test.Instead,overexpression of OGT in GABAergic neurons in the VTA had no effect on these behaviors.These results suggest that protein O-GlcNAcylation of DAergic neurons in the VTA plays an important role in regulating the response to natural reward and motor learning in mice.
