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The biological meaning of eye pupil size is a subject of intense research. This study shows that pupil fluctuations reveal information about hypothalamic orexin cells, which control pupil size via a noradrenaline neural circuit.
Froudist-Walsh et al. reveal organizational principles of receptor densities in macaque cortex. Densities of multiple receptor types align with changes in dendritic properties, myelin and functional networks. Data are openly released to the community.
By inferring the cellular landscape of the neocortex in 638 aged individuals from RNA profiles, the authors uncovered unique cellular communities composed of coordinated populations of multiple cell types, which were altered in Alzheimer’s disease.
This Review provides a comprehensive overview of the neuronal heterogeneity, circuit architecture and functional roles of the external globus pallidus, with emphasis on how the latest data deviate from traditional views of the basal ganglia.
Vasek et al. show that microglia perform protein translation in their processes and that this translation is important for the number of processes and formation of phagocytic cups. These findings may provide insight into how microglia respond rapidly to a wide variety of local signals in defined cellular compartments.
Bonheur et al. developed a subcellular-distribution-based bidirectional neural activity reporter that operates on the timescale of minutes, and they demonstrate increases and decreases of neural activity associated with social behaviors in Drosophila.
Neuroscience research is affected by a substantial racial bias, but there are major challenges involved in minimizing this bias. Here we discuss these challenges and call for a global discussion that develops answers to these challenges and defines best practices for how researchers can better represent human diversity and work against medical racism. This global discussion should involve researchers from medicine, life sciences, social sciences, and humanities, as well as people with lived experience and health equity activists, to improve racial and ethnic equity in neuroscience research and beyond.
Oxycodone withdrawal triggered distinct transcriptomic changes in the ventral tegmental area, nucleus accumbens and medial prefrontal cortex in mice with and without chronic pain, with histone deacetylase 1 (HDAC1) as a common upstream regulator. A novel HDAC1/HDAC2 inhibitor reduced behavioral manifestations of oxycodone withdrawal.
Yin et al. identify miR-155–IFN-γ signaling that regulates a protective microglial subset in a mouse model of Alzheimer’s disease. These microglia enhance plaque compaction, reduce dystrophic neurites and synaptic degradation, and improve cognition.
Camacho et al. show that emotion concepts are represented throughout the brain, giving insight to how the brain perceives real-world emotions. These patterns are present before children enter school and become more standardized across adolescence.
Psychedelics induce fast and long-lasting antidepressant effects and neuronal plasticity, but their hallucinogenic effects limit their use. We show that, in mice, psychedelics bind directly to TrkB (the brain-derived neurotrophic factor (BDNF) receptor) with high affinity and promote BDNF-mediated plasticity and antidepressant-like effects, whereas their hallucinogenic-like effects are independent of TrkB binding.
Vasek et al. demonstrate that distal processes of microglia locally translate specific mRNAs including those related to immunity and phagocytosis. They then show that local protein synthesis is necessary for microglial process-initiated phagocytosis.
Moliner et al. show that psychedelics directly bind to the BDNF receptor TrkB with high affinity and promote BDNF-mediated plasticity and antidepressant-like effects, whereas their hallucinogenic-like effects are independent of TrkB binding.
As Nature Neuroscience celebrates its 25th anniversary, we are having conversations with both established leaders in the field and those earlier in their careers to discuss how the field has evolved and where it is heading. This month we are talking to Carla Shatz, who is the Sapp Family Provostial Professor, Catherine Holman Johnson Director of Stanford Bio-X, and Professor of Biology and Neurobiology at Stanford University. Her work has illuminated mechanisms of visual system development and plasticity and has focused more recently on synaptic pruning mechanisms.
A study by Holstein-Rønsbo, Gan et al. published in this issue of Nature Neuroscience adds another dimension to the ‘glymphatic’ story — the role of functional hyperemia facilitating perivascular flow of cerebrospinal fluid along pial arteries.
Sleep helps to stabilize long-term memories, possibly through the temporal synchronization of neuronal activity in different brain regions. Intracranial stimulation during sleep using prefrontal electric pulses, precisely timed with slow-wave activities in the medial temporal lobe, enhanced the coupling of neuronal oscillations across regions of the human brain and improved memory performance.