Skip to Main content Skip to Navigation
Journal articles

Dp71 contribution to the molecular scaffold anchoring aquaporine‐4 channels in brain macroglial cells

Abstract : Intellectual disability in Duchenne muscular dystrophy has been associated with the loss of dystrophin-protein 71, Dp71, the main dystrophin-gene product in the adult brain. Dp71 shows major expression in perivascular macroglial endfeet, suggesting that dysfunctional glial mechanisms contribute to cognitive impairments. In the present study, we investigated the molecular alterations induced by a selective loss of Dp71 in mice, using semi-quantitative immunogold analyses in electron microscopy and immunofluorescence confocal analyses in brain sections and purified gliovascular units. In macroglial pericapillary endfeet of the cerebellum and hippocampus, we found a drastic reduction (70%) of the polarized distribution of aquaporin-4 (AQP4) channels, a 50% reduction of β-dystroglycan, and a complete loss of α1-syntrophin. Interestingly, in the hippocampus and cortex, these effects were not homogeneous: AQP4 and AQP4ex isoforms were mostly lost around capillaries but preserved in large vessels corresponding to pial arteries, penetrating cortical arterioles, and arterioles of the hippocampal fissure, indicating the presence of Dp71-independent pools of AQP4 in these vascular structures. In conclusion, the depletion of Dp71 strongly alters the distribution of AQP4 selectively in macroglial perivascular endfeet surrounding capillaries. This effect likely affects water homeostasis and blood-brain barrier functions and may thus contribute to the synaptic and cognitive defects associated with Dp71 deficiency.
Document type :
Journal articles
Complete list of metadata
Contributor : Alain PERIGNON Connect in order to contact the contributor
Submitted on : Thursday, October 28, 2021 - 5:45:31 PM
Last modification on : Friday, April 1, 2022 - 3:52:00 AM
Long-term archiving on: : Saturday, January 29, 2022 - 8:01:55 PM


Belmaati et al 2021.pdf
Files produced by the author(s)



Mehdi Belmaati Cherkaoui, Ophélie Vacca Vacca, Charlotte Izabelle, Anne‐cécile Boulay, Claire Boulogne, et al.. Dp71 contribution to the molecular scaffold anchoring aquaporine‐4 channels in brain macroglial cells. Glia, Wiley, 2021, 69 (4), pp.954-970. ⟨10.1002/glia.23941⟩. ⟨hal-03035498⟩



Record views


Files downloads