Microglia-neuron crosstalk via Hex-GM2-MGL2 maintains brain homeostasis.

As tissue resident macrophages of the central nervous system (CNS) parenchyma, microglia perform diverse essential functions during homeostasis and perturbations. They primarily interact with neurons via synaptic engulfment and through the rapid elimination of apoptotic cells and nonfunctional synapses. Here, by combining unbiased lipidomics and high resolution spatial lipid imaging, deep single-cell transcriptome analysis and novel cell type-specific mutants, we identified a previously unknown mode of microglial interaction with neurons.

Response of spatially defined microglia states with distinct chromatin accessibility in a mouse model of Alzheimer's disease.

Microglial spatial heterogeneity remains a crucial yet not fully answered question in the context of potential cell-directed therapies for Alzheimer's disease (AD). There is an unclear understanding of the dynamics of distinct microglia states adjacent to or far from amyloid-beta (Aβ) plaques and their contributions to neurodegenerative diseases. Here we combine multicolor fluorescence cell fate mapping, single-cell transcriptional analysis, epigenetic profiling, immunohistochemistry and computational modeling to comprehensively characterize the relation of plaque-associated microglia (PAM) and non-plaque-associated microglia (non-PAM) in a mouse model of AD.

Rapid phagosome isolation enables unbiased multiomic analysis of human microglial phagosomes.

Microglia are the resident macrophages of the central nervous system (CNS). Their phagocytic activity is central during brain development and homeostasis-and in a plethora of brain pathologies. However, little is known about the composition, dynamics, and function of human microglial phagosomes under homeostatic and pathological conditions.

Human physiomimetic model integrating microphysiological systems of the gut, liver, and brain for studies of neurodegenerative diseases.

Slow progress in the fight against neurodegenerative diseases (NDs) motivates an urgent need for highly controlled in vitro systems to investigate organ-organ- and organ-immune-specific interactions relevant for disease pathophysiology. Of particular interest is the gut/microbiome-liver-brain axis for parsing out how genetic and environmental factors contribute to NDs. We have developed a mesofluidic platform technology to study gut-liver-cerebral interactions in the context of Parkinson's disease (PD).

SARS-CoV-2 RNA reverse-transcribed and integrated into the human genome.

Prolonged SARS-CoV-2 RNA shedding and recurrence of PCR-positive tests have been widely reported in patients after recovery, yet these patients most commonly are non-infectious. Here we investigated the possibility that SARS-CoV-2 RNAs can be reverse-transcribed and integrated into the human genome and that transcription of the integrated sequences might account for PCR-positive tests. In support of this hypothesis, we found chimeric transcripts consisting of viral fused to cellular sequences in published data sets of SARS-CoV-2 infected cultured cells and primary cells of patients, consistent with the transcription of viral sequences integrated into the genome.

MeCP2 links heterochromatin condensates and neurodevelopmental disease.

Methyl CpG binding protein 2 (MeCP2) is a key component of constitutive heterochromatin, which is crucial for chromosome maintenance and transcriptional silencing. Mutations in the MECP2 gene cause the progressive neurodevelopmental disorder Rett syndrome, which is associated with severe mental disability and autism-like symptoms that affect girls during early childhood. Although previously thought to be a dense and relatively static structure, heterochromatin is now understood to exhibit properties consistent with a liquid-like condensate.

Experimental Cortical Spreading Depression Induces NMDA Receptor Dependent Potassium Currents in Microglia.

Unlabelled: Cortical spreading depression (CSD) is a propagating event of neuronal depolarization, which is considered as the cellular correlate of the migraine aura. It is characterized by a change in the intrinsic optical signal and by a negative DC potential shift. Microglia are the resident macrophages of the CNS and act as sensors for pathological changes.

Satellite microglia show spontaneous electrical activity that is uncorrelated with activity of the attached neuron.

Microglia are innate immune cells of the brain. We have studied a subpopulation of microglia, called satellite microglia. This cell type is defined by a close morphological soma-to-soma association with a neuron, indicative of a direct functional interaction.