Furthermore, plots of both oscillation and spike frequency vs. intracellular [HCO3-] show a strong linear correlation. Increased frequency of TTX-insensitive spikes is associated with increases in intracellular Ca2+ concentrations. ERK inhibitor screening library Finally, both the appearance and frequency of TTX-insensitive spikes and oscillations increase over postnatal ages day 3-16. Our data suggest that 1) L-type Ca2+ currents in LC neurons arise from channel
populations that reside in different regions of the neuron, 2) these L-type Ca2+ currents undergo significant postnatal development, and 3) the activity of these L-type Ca2+ currents is activated by increased CO2 through a HCO3–dependent mechanism. Thus the activity of L-type AG-881 solubility dmso Ca2+ channels is likely to play a role in the chemosensitive
response of LC neurons and may underlie significant changes in LC neuron chemosensitivity during neonatal development.”
“Beste C, Baune BT, Falkenstein M, Konrad C. Variations in the TNF-alpha gene (TNF-alpha-308G -> A) affect attention and action selection mechanisms in a dissociated fashion. J Neurophysiol 104: 2523-2531, 2010. First published September 1, 2010; doi:10.1152/jn.00561.2010. There is growing interest to understand the molecular basis of complex cognitive processes. While neurotransmitter systems have frequently been examined, other, for example neuroimmunological factors have attracted much less interest. Recent evidence suggests that the A allele of the tumor necrosis factor alpha (TNF-alpha) 308G -> A single nucleotide polymorphism (SNP; rs1800629) Selleck Go 6983 enhances cognitive functions. However, it is also known that TNF-alpha exerts divergent, region-specific effects on neuronal functioning. Thus the finding that the A allele is associated with enhanced cognitive performance may be due to regionally
specific effects of TNF-alpha. In this study, associations between the TNF-alpha -308G -> A single nucleotide polymorphism (rs1800629) and cognitive function in an event-related potential (ERP) study in healthy participants (n = 96) are investigated. We focus on subprocesses of stimulus-response compatibility that are known to be mediated by different brain systems. The results show a dissociative effect of the TNF- 308G -> A SNP on ERPs reflecting attentional (N1) versus conflict and action selection processes [N2 and early-lateralized readiness potential (e-LRP)] between the AA/AG and the GG genotypes. Compared with the GG genotype group, attentional processes (N1) were enhanced in the combined AA/AG genotype group, while conflict processing functions (N2) and the selection of actions (LRP) were reduced. The results refine the picture of the effects of the TNF-alpha -308G -> A SNP on cognitive functions and emphasize the known divergent effects of TNF-alpha on brain functions.
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