The nuclear envelope is increasingly viewed from an electrophysiological perspective by researchers interested in signal transduction pathways that influence gene transcription and other processes in the nucleus. Here...The nuclear envelope is increasingly viewed from an electrophysiological perspective by researchers interested in signal transduction pathways that influence gene transcription and other processes in the nucleus. Here, we describe evidence for ion channels and transporters in the nuclear membranes and for possible ion gating by the nuclear pores. We argue that a systems-level understanding of cellular regulation is likely to require the assimilation of nuclear electrophysiology into molecular and biochemical signaling pathways.展开更多
Abstract The expression of early developmental markers such as doublecortin （DCX） and the polysialylated-neural cell adhesion molecule （PSA-NCAMIp has been used to identify immature neurons within canonical neuroge...Abstract The expression of early developmental markers such as doublecortin （DCX） and the polysialylated-neural cell adhesion molecule （PSA-NCAMIp has been used to identify immature neurons within canonical neurogenic niches. Additionally, DCX/PSA-NCAM ＋ immature neurons reside in cortical layer II of the paleocortex and in the paleo- and entorhinal cortex of mice and rats, respectively. These cells are also found in the neocortex of guinea pigs, rabbits, some afrotherian mammals, cats, dogs, non-human primates, and humans. The population of cortical DCX/PSA-NCAM ＋ immature neurons is generated prenatally as conclusively demonstrated in mice, rats, and guinea pigs. Thus, the majority of these cells do not appear to be the product of adult proliferative events. The immature neurons in cortical layer II are most abundant in the corlLices of young individuals, while very few DCX/PSA-NCAM ＋ cortical neurons can be detected in aged mammals. Maturation of DCX/PSA-NCAM ＋ cells into glutamatergic and GABAergic neurons has been proposed as an explanation for the age-dependent reduction in their population over time. In this review, we compile the recent information regarding the age-related decrease in the number of cortical DCX/PSA-NCAM ＋ neurons. We compare the distribution and fates of DCX/PSA-NCAM ＋ neurons among mammalian species and speculate their impact on cognitive function. To respond to the diversity of adult neurogenesis research produced over the last number of decades, we close this review by discussing the use and precision of the term ＂adult non-canonical neurogenesis.＂展开更多
文摘The nuclear envelope is increasingly viewed from an electrophysiological perspective by researchers interested in signal transduction pathways that influence gene transcription and other processes in the nucleus. Here, we describe evidence for ion channels and transporters in the nuclear membranes and for possible ion gating by the nuclear pores. We argue that a systems-level understanding of cellular regulation is likely to require the assimilation of nuclear electrophysiology into molecular and biochemical signaling pathways.
文摘Abstract The expression of early developmental markers such as doublecortin （DCX） and the polysialylated-neural cell adhesion molecule （PSA-NCAMIp has been used to identify immature neurons within canonical neurogenic niches. Additionally, DCX/PSA-NCAM ＋ immature neurons reside in cortical layer II of the paleocortex and in the paleo- and entorhinal cortex of mice and rats, respectively. These cells are also found in the neocortex of guinea pigs, rabbits, some afrotherian mammals, cats, dogs, non-human primates, and humans. The population of cortical DCX/PSA-NCAM ＋ immature neurons is generated prenatally as conclusively demonstrated in mice, rats, and guinea pigs. Thus, the majority of these cells do not appear to be the product of adult proliferative events. The immature neurons in cortical layer II are most abundant in the corlLices of young individuals, while very few DCX/PSA-NCAM ＋ cortical neurons can be detected in aged mammals. Maturation of DCX/PSA-NCAM ＋ cells into glutamatergic and GABAergic neurons has been proposed as an explanation for the age-dependent reduction in their population over time. In this review, we compile the recent information regarding the age-related decrease in the number of cortical DCX/PSA-NCAM ＋ neurons. We compare the distribution and fates of DCX/PSA-NCAM ＋ neurons among mammalian species and speculate their impact on cognitive function. To respond to the diversity of adult neurogenesis research produced over the last number of decades, we close this review by discussing the use and precision of the term ＂adult non-canonical neurogenesis.＂
