Cenpj is a centrosomal protein located at the centrosomes and the base of cilia,it plays essential roles in regulating neurogenesis and cerebral cortex development.Although centrosomal and cilium dysfunction are one o...Cenpj is a centrosomal protein located at the centrosomes and the base of cilia,it plays essential roles in regulating neurogenesis and cerebral cortex development.Although centrosomal and cilium dysfunction are one of the causes of obesity,insulin resistance,and type 2 diabetes,the role that Cenpj plays in the regulation of body weight remains unclear.Here,we deleted Cenpj by crossing Cenpjflox/flox mice with Nkx2.1-Cre mice.Loss of the centrosomal protein Cenpj in Nkx2.1-expressing cells causes morbid obesity in mice at approximately 4 months of age with expended brain ventricles but no change of brain size.We found that hypothalamic cells exhibited reduced proliferation and increased apoptosis upon Cenpj depletion at the embryonic stages,resulting in a dramatic decrease in the number of Proopiomelanocortin(POMC)neurons and electrophysiological dysfunction of NPY neurons in the arcuate nucleus(ARC)in adults.Furthermore,depletion of Cenpj also reduced the neuronal projection from the ARC to the paraventricular nucleus(PVN),with decreased melanocortin-4 receptors(MC4R)expression in PVN neurons.The study defines the roles that Cenpj plays in regulating hypothalamus development and body weight,providing a foundation for further understanding of the pathological mechanisms of related diseases.展开更多
Congenital hydrocephalus is a major neurological disorder with high rates of morbidity and mortality;however,the underlying cellular and molecular mechanisms remain largely unknown.Reproducible animal models mirroring...Congenital hydrocephalus is a major neurological disorder with high rates of morbidity and mortality;however,the underlying cellular and molecular mechanisms remain largely unknown.Reproducible animal models mirroring both embryonic and postnatal hydrocephalus are also limited.Here,we describe a new mouse model of congenital hydrocephalus through knockout ofβ-catenin in Nkx2.1-expressing regional neural progenitors.Progressive ventriculomegaly and an enlarged brain were consistently observed in knockout mice from embryonic day 12.5 through to adulthood.Transcriptome profiling revealed severe dysfunctions in progenitor maintenance in the ventricular zone and therefore in cilium biogenesis afterβ-catenin knockout.Histological analyses also revealed an aberrant neuronal layout in both the ventral and dorsal telencephalon in hydrocephalic mice at both embryonic and postnatal stages.Thus,knockout ofβ-catenin in regional neural progenitors leads to congenital hydrocephalus and provides a reproducible animal model for studying pathological changes and developing therapeutic interventions for this devastating disease.展开更多
基金the National Basic Research Program of China(2017YFA0102601,2019YFA0110101,2017YFA0103303)the National Natural Science Foundation of China(31671072,91732301,31771140,81891001)+1 种基金Strategic Priority Research Program of the Chinese Academy of Sciences,the Grants of Beijing Brain Initiative of Beijing Municipal Science and Technology Commission(Z181100001518004)Open Research Fund of the State Key Laboratory of Cognitive Neuroscience and Learning.
文摘Cenpj is a centrosomal protein located at the centrosomes and the base of cilia,it plays essential roles in regulating neurogenesis and cerebral cortex development.Although centrosomal and cilium dysfunction are one of the causes of obesity,insulin resistance,and type 2 diabetes,the role that Cenpj plays in the regulation of body weight remains unclear.Here,we deleted Cenpj by crossing Cenpjflox/flox mice with Nkx2.1-Cre mice.Loss of the centrosomal protein Cenpj in Nkx2.1-expressing cells causes morbid obesity in mice at approximately 4 months of age with expended brain ventricles but no change of brain size.We found that hypothalamic cells exhibited reduced proliferation and increased apoptosis upon Cenpj depletion at the embryonic stages,resulting in a dramatic decrease in the number of Proopiomelanocortin(POMC)neurons and electrophysiological dysfunction of NPY neurons in the arcuate nucleus(ARC)in adults.Furthermore,depletion of Cenpj also reduced the neuronal projection from the ARC to the paraventricular nucleus(PVN),with decreased melanocortin-4 receptors(MC4R)expression in PVN neurons.The study defines the roles that Cenpj plays in regulating hypothalamus development and body weight,providing a foundation for further understanding of the pathological mechanisms of related diseases.
基金This work was supported by grants from the National Key Research and Development Program of China(2018YFA0108000 and 2019YFA0110300)the National Natural Science Foundation of China(8205020,32000689,31400934,31771132,31872760,31801204,and 31800858)+3 种基金the Science and Technology Commission of Shanghai Municipality(19JC1415100 and 21140902300)the Shanghai Municipal Education Commission(C120114)China Postdoctoral Science Foundation(2017M621526)the Fundamental Research Funds for the Central Universities,and the Major Program of Development Fund for Shanghai Zhangjiang National Innovation Demonstration Zone(Stem Cell Strategic Biobank and Clinical Translation Platform of Stem Cell Technology,ZJ2018-ZD-004).
文摘Congenital hydrocephalus is a major neurological disorder with high rates of morbidity and mortality;however,the underlying cellular and molecular mechanisms remain largely unknown.Reproducible animal models mirroring both embryonic and postnatal hydrocephalus are also limited.Here,we describe a new mouse model of congenital hydrocephalus through knockout ofβ-catenin in Nkx2.1-expressing regional neural progenitors.Progressive ventriculomegaly and an enlarged brain were consistently observed in knockout mice from embryonic day 12.5 through to adulthood.Transcriptome profiling revealed severe dysfunctions in progenitor maintenance in the ventricular zone and therefore in cilium biogenesis afterβ-catenin knockout.Histological analyses also revealed an aberrant neuronal layout in both the ventral and dorsal telencephalon in hydrocephalic mice at both embryonic and postnatal stages.Thus,knockout ofβ-catenin in regional neural progenitors leads to congenital hydrocephalus and provides a reproducible animal model for studying pathological changes and developing therapeutic interventions for this devastating disease.
