A developmental analysis of juxtavascular microglia dynamics and interactions with the vasculature [preprint]
Becker, Shannon C.
Kautzman, Amanda G.
Baer, Christina E.
Huang, Eric J.
Schafer, Dorothy P
Student AuthorsErica Mondo
UMass Chan AffiliationsMicrobiology and Physiological Systems
Graduate School of Biomedical Sciences
neuronal cell biology
Neuroscience and Neurobiology
MetadataShow full item record
AbstractMicroglia, the resident macrophages of the central nervous system (CNS), are dynamic cells, constantly extending and retracting their processes as they contact and functionally regulate neurons and other glial cells. There is far less known about microglia-vascular interactions, particularly under healthy steady-state conditions. Here, we use the male and female mouse cerebral cortex to show that a higher percentage of microglia associate with the vasculature during the first week of postnatal development compared to older ages and the timing of these associations are dependent on the fractalkine receptor (CX3CR1). Similar developmental microglia-vascular associations were detected in the prenatal human brain. Using live imaging in mice, we found that juxtavascular microglia migrated when microglia are actively colonizing the cortex and became stationary by adulthood to occupy the same vascular space for nearly 2 months. Further, juxtavascular microglia at all ages contact vascular areas void of astrocyte endfeet and the developmental shift in microglial migratory behavior along vessels corresponded to when astrocyte endfeet more fully ensheath vessels. Together, our data provide a comprehensive assessment of microglia-vascular interactions. They support a mechanism by which microglia use the vasculature to migrate within the developing brain parenchyma. This migration becomes restricted upon the arrival of astrocyte endfeet when juxtavascular microglia then establish a long-term, stable contact with the vasculature.
bioRxiv 2020.05.25.110908; doi: https://doi.org/10.1101/2020.05.25.110908. Link to preprint on bioRxiv service.
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/29458
Now published in The Journal of Neuroscience, doi:10.1523/JNEUROSCI.3006-19.2020
RightsThe copyright holder for this preprint (which was not peer-reviewed) is the author/funder. It is made available under a CC-BY-NC-ND 4.0 International license.
Except where otherwise noted, this item's license is described as The copyright holder for this preprint (which was not peer-reviewed) is the author/funder. It is made available under a CC-BY-NC-ND 4.0 International license.