In the nonmigratory GDC 0449 phase, Fos-like immunoreactive (Fos-lir) cells in the olfactory and visual subsystems were high in the day and low at night. In the migratory phase, this was reversed; Fos-lir cells were high at night and low in the day. The phase inversion of neural activity in the olfactory and visual systems in parallel with the behavioral shift suggests a functional coupling between the systems governing migratory flight (expressed as Zugunruhe) and migratory orientation and navigation. “
“Alzheimer’s disease (AD) is an age-related neurodegenerative disorder characterized by memory impairments. Brain oscillatory activity

is critical for cognitive function and is altered in AD patients. Recent evidence suggests that accumulation of soluble amyloid-beta (Aβ) induces reorganization of hippocampal networks. However,

whether fine changes in network activity might be present at very early stages, before Aβ overproduction, remains to be determined. We therefore assessed whether theta and gamma oscillations and their cross-frequency coupling, which are known to be essential for normal memory function, were precociously altered in the hippocampus. Electrophysiological field potential recordings were performed using complete hippocampal preparations in vitro from young transgenic CRND8 mice, a transgenic mouse model of AD. Our results indicate that a significant C59 wnt datasheet proportion of 1-month-old TgCRND8 mice showed robust alterations of theta–gamma cross-frequency coupling in the principal output

region of the hippocampus, the subiculum. In addition we showed that, compared to controls, these mice Selleck Ribociclib expressed negligible levels of Aβ. Finally, these network alterations were not due to genetic factors as 15-day-old animals did not exhibit theta–gamma coupling alterations. Thus, initial alterations in hippocampal network activity arise before Aβ accumulation and may represent an early biomarker for AD. “
“The measurement of spontaneous ongoing pain in rodents is a multiplex issue and a subject of extensive and longstanding debate. Considering the need to align available rodent models with clinically relevant forms of pain, it is of prime importance to thoroughly characterize behavioral outcomes in rodents using a portfolio of measurements that are not only stimulus-dependent but also encompass voluntary behavior in unrestrained animals. Moreover, the temporal course and duration of behavioral tests should be taken into consideration when we plan our studies to measure explicit chronic pain, with a particular emphasis on performing longitudinal studies in rodents.