Multiplexed chemogenetics in astrocytes and motoneurons restore blood–spinal cord barrier in ALS - Inserm - Institut national de la santé et de la recherche médicale Access content directly
Journal Articles Life Science Alliance Year : 2020

Multiplexed chemogenetics in astrocytes and motoneurons restore blood–spinal cord barrier in ALS

Najwa Ouali Alami
Linyun Tang
  • Function : Author
David Bayer
  • Function : Author
Jochen Weishaupt
Bernd Baumann
  • Function : Author
Thomas Wirth
  • Function : Author
Deniz Yilmazer-Hanke

Abstract

Blood–spinal cord barrier (BSCB) disruption is thought to contribute to motoneuron (MN) loss in amyotrophic lateral sclerosis (ALS). It is currently unclear whether impairment of the BSCB is the cause or consequence of MN dysfunction and whether its restoration may be directly beneficial. We revealed that SOD1 G93A , FUS Δ NLS , TDP43 G298S , and Tbk1 +/− ALS mouse models commonly shared alterations in the BSCB, unrelated to motoneuron loss. We exploit PSAM/PSEM chemogenetics in SOD1 G93A mice to demonstrate that the BSCB is rescued by increased MN firing, whereas inactivation worsens it. Moreover, we use DREADD chemogenetics, alone or in multiplexed form, to show that activation of Gi signaling in astrocytes restores BSCB integrity, independently of MN firing, with no effect on MN disease markers and dissociating them from BSCB disruption. We show that astrocytic levels of the BSCB stabilizers Wnt7a and Wnt5a are decreased in SOD1 G93A mice and strongly enhanced by Gi signaling, although further decreased by MN inactivation. Thus, we demonstrate that BSCB impairment follows MN dysfunction in ALS pathogenesis but can be reversed by Gi-induced expression of astrocytic Wnt5a/7a.
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Dates and versions

inserm-03376310 , version 1 (13-10-2021)

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Najwa Ouali Alami, Linyun Tang, Diana Wiesner, Barbara Commisso, David Bayer, et al.. Multiplexed chemogenetics in astrocytes and motoneurons restore blood–spinal cord barrier in ALS. Life Science Alliance, 2020, 3 (11), pp.e201900571. ⟨10.26508/lsa.201900571⟩. ⟨inserm-03376310⟩

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