Drebrin controls scar formation and astrocyte reactivity upon traumatic brain injury by regulating membrane trafficking.


Journal

Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555

Informations de publication

Date de publication:
05 03 2021
Historique:
received: 10 07 2020
accepted: 27 01 2021
entrez: 6 3 2021
pubmed: 7 3 2021
medline: 20 3 2021
Statut: epublish

Résumé

The brain of mammals lacks a significant ability to regenerate neurons and is thus particularly vulnerable. To protect the brain from injury and disease, damage control by astrocytes through astrogliosis and scar formation is vital. Here, we show that brain injury in mice triggers an immediate upregulation of the actin-binding protein Drebrin (DBN) in astrocytes, which is essential for scar formation and maintenance of astrocyte reactivity. In turn, DBN loss leads to defective astrocyte scar formation and excessive neurodegeneration following brain injuries. At the cellular level, we show that DBN switches actin homeostasis from ARP2/3-dependent arrays to microtubule-compatible scaffolds, facilitating the formation of RAB8-positive membrane tubules. This injury-specific RAB8 membrane compartment serves as hub for the trafficking of surface proteins involved in astrogliosis and adhesion mediators, such as β1-integrin. Our work shows that DBN-mediated membrane trafficking in astrocytes is an important neuroprotective mechanism following traumatic brain injury in mice.

Identifiants

pubmed: 33674568
doi: 10.1038/s41467-021-21662-x
pii: 10.1038/s41467-021-21662-x
pmc: PMC7935889
doi:

Substances chimiques

Actin-Related Protein 2-3 Complex 0
Actins 0
Neuropeptides 0
Rab8 protein, mouse 0
drebrins 0
rab GTP-Binding Proteins EC 3.6.5.2

Types de publication

Journal Article Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

1490

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Auteurs

Juliane Schiweck (J)

Institute of Biochemistry, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Kai Murk (K)

Institute of Biochemistry, Charité - Universitätsmedizin Berlin, Berlin, Germany. kai.murk@charite.de.

Julia Ledderose (J)

Institute of Biochemistry, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Agnieszka Münster-Wandowski (A)

Institute of Anatomy, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Marta Ornaghi (M)

Institute of Biochemistry, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Imre Vida (I)

Institute of Anatomy, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Britta J Eickholt (BJ)

Institute of Biochemistry, Charité - Universitätsmedizin Berlin, Berlin, Germany. britta.eickholt@charite.de.
NeuroCure - Cluster of Excellence, Charité - Universitätsmedizin Berlin, Berlin, Germany. britta.eickholt@charite.de.

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