Please use this identifier to cite or link to this item: http://hdl.handle.net/2067/43543
Title: Defects of full-length dystrophin trigger retinal neuron damage and synapse alterations by disrupting functional autophagy
Authors: Catalani Elisabetta 
Bongiorni, Silvia
Taddei, Anna Rita
Mezzetti, Marta
Silvestri, Federica
Coazzoli, Marco
Zecchini, Silvia
Giovarelli, Matteo
Perrotta, Cristiana
De Palma, Clara
Clementi, Emilio
Ceci, Marcello 
Prantera, Giorgio 
Cervia, Davide 
Journal: CELLULAR AND MOLECULAR LIFE SCIENCES 
Issue Date: 2021
Abstract: 
Dystrophin (dys) mutations predispose Duchenne muscular disease (DMD) patients to brain and retinal complications. Although different dys variants, including long dys products, are expressed in the retina, their function is largely unknown. We investigated the putative role of full-length dystrophin in the homeostasis of neuro-retina and its impact on synapsis stabilization and cell fate. Retinas of mdx mice, the most used DMD model which does not express the 427-KDa dys protein (Dp427), showed overlapped cell death and impaired autophagy. Apoptotic neurons in the outer plexiform/inner nuclear layer and the ganglion cell layer had an impaired autophagy with accumulated autophagosomes. The autophagy dysfunction localized at photoreceptor axonal terminals and bipolar, amacrine, and ganglion cells. The absence of Dp427 does not cause a severe phenotype but alters the neuronal architecture, compromising mainly the pre-synaptic photoreceptor terminals and their post-synaptic sites. The analysis of two dystrophic mutants of the fruit fly Drosophila melanogaster, the homozygous DysE17 and DysEP3397, lacking functional large-isoforms of dystrophin-like protein, revealed rhabdomere degeneration. Structural damages were evident in the internal network of retina/lamina where photoreceptors make the first synapse. Both accumulated autophagosomes and apoptotic features were detected and the visual system was functionally impaired. The reactivation of the autophagosome turnover by rapamycin prevented neuronal cell death and structural changes of mutant flies and, of interest, sustained autophagy ameliorated their response to light. Overall, these findings indicate that functional full-length dystrophin is required for synapsis stabilization and neuronal survival of the retina, allowing also proper autophagy as a prerequisite for physiological cell fate and visual properties.
URI: http://hdl.handle.net/2067/43543
ISSN: 1420-682X
DOI: 10.1007/s00018-020-03598-5
Rights: Attribution-NonCommercial-NoDerivs 3.0 United States
Appears in Collections:A1. Articolo in rivista

Files in This Item:
File Description SizeFormat Existing users please
Catalani et al Cell Mol Life Sci 2021.pdf9.99 MBAdobe PDF    Request a copy
Show full item record

SCOPUSTM   
Citations 10

8
Last Week
0
Last month
0
checked on Aug 5, 2022

Page view(s)

39
Last Week
0
Last month
13
checked on Aug 12, 2022

Download(s)

1
checked on Aug 12, 2022

Google ScholarTM

Check

Altmetric


This item is licensed under a Creative Commons License Creative Commons