NDLI: Microglial repopulation model reveals a robust homeostatic process for replacing CNS myeloid cells

Content Provider	PubMed Central
Author	Varvel, Nicholas H. Grathwohl, Stefan A. Baumann, Frank Liebig, Christian Bosch, Andrea Bianca, Brawek Thal, Dietmar R. Charo, Israel F. Heppner, Frank L. Adriano, Aguzzi Olga, Garaschuk Ransohoff, Richard M. Jucker, Mathias
Abstract	Under most physiological circumstances, monocytes are excluded from parenchymal CNS tissues. When widespread monocyte entry occurs, their numbers decrease shortly after engraftment in the presence of microglia. However, some disease processes lead to focal and selective loss, or dysfunction, of microglia, and microglial senescence typifies the aged brain. In this regard, the long-term engraftment of monocytes in the microglia-depleted brain remains unknown. Here, we report a model in which a niche for myeloid cells was created through microglia depletion. We show that microglia-depleted brain regions of CD11b-HSVTK transgenic mice are repopulated with new Iba-1-positive cells within 2 wk. The engrafted cells expressed high levels of CD45 and CCR2 and appeared in a wave-like pattern frequently associated with blood vessels, suggesting the engrafted cells were peripheral monocytes. Although two times more numerous and morphologically distinct from resident microglia up to 27 wk after initial engraftment, the overall distribution of the engrafted cells was remarkably similar to that of microglia. Two-photon in vivo imaging revealed that the engrafted myeloid cells extended their processes toward an ATP source and displayed intracellular calcium transients. Moreover, the engrafted cells migrated toward areas of kainic acid-induced neuronal death. These data provide evidence that circulating monocytes have the potential to occupy the adult CNS myeloid niche normally inhabited by microglia and identify a strong homeostatic drive to maintain the myeloid component in the mature brain.
Related Links	http://dx.doi.org/10.1073/pnas.1210150109
Ending Page	18155
Page Count	6
Starting Page	18150
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	44
Volume Number	109
Language	English
Publisher	National Academy of Sciences
Publisher Date	2012-10-30
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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