TY  - JOUR
AU  - Yamoah, Alfred
AU  - Tripathi, Priyanka
AU  - Guo, Haihong
AU  - Scheve, Leonie
AU  - Walter, Peter
AU  - Johnen, Sandra
AU  - Müller, Frank
AU  - Weis, Joachim
AU  - Goswami, Anand
TI  - Early Alterations of RNA Binding Protein (RBP) Homeostasis and ER Stress-Mediated Autophagy Contributes to Progressive Retinal Degeneration in the rd10 Mouse Model of Retinitis Pigmentosa (RP)
JO  - Cells
VL  - 12
IS  - 7
SN  - 2073-4409
CY  - Basel
PB  - MDPI
M1  - FZJ-2023-01780
SP  - 1094
PY  - 2023
N1  - This research was supported by the DFG grants, WE1406/14-3 to J.W., WE 1406/16-1 to J.W.and A.G., MU-3036/3-3 to F.M.,WA-1472/6-3 to P.W., and JO-1263/1-3 to S.J., by the InterdisciplinaryCentre for Clinical Research (IZKF Aachen, N7-4, to A.G. and J.W.) and by the EU Joint ProgramNeurodegenerative Disease Research (JPND, Fly-SMALS, to J.W.).
AB  - The retinal degeneration 10 (rd10) mouse model is widely used to study retinitis pigmentosa(RP) pathomechanisms. It offers a rather unique opportunity to study trans-neuronal degenerationbecause the cell populations in question are separated anatomically and the mutated Pde6b gene isselectively expressed in rod photoreceptors. We hypothesized that RNA binding protein (RBP) aggregationand abnormal autophagy might serve as early pathogenic events, damaging non-photoreceptorretinal cell types that are not primarily targeted by the Pde6b gene defect. We used a combination ofimmunohistochemistry (DAB, immunofluorescence), electron microscopy (EM), subcellular fractionation,andWestern blot analysis on the retinal preparations obtained from both rd10 and wild-typemice. We found early, robust increases in levels of the protective endoplasmic reticulum (ER) calcium(Ca2+) buffering chaperone Sigma receptor 1 (SigR1) together with other ER-Ca2+ buffering proteinsin both photoreceptors and non-photoreceptor neuronal cells before any noticeable photoreceptordegeneration. In line with this, we found markedly altered expression of the autophagy proteinsp62 and LC3, together with abnormal ER widening and large autophagic vacuoles as detected byEM. Interestingly, these changes were accompanied by early, prominent cytoplasmic and nuclearaggregation of the key RBPs including pTDP-43 and FET family RBPs and stress granule formation.We conclude that progressive neurodegeneration in the rd10 mouse retina is associated with earlydisturbances of proteostasis and autophagy, along with abnormal cytoplasmic RBP aggregation.
LB  - PUB:(DE-HGF)16
C6  - 37048167
UR  - <Go to ISI:>//WOS:000969574200001
DO  - DOI:10.3390/cells12071094
UR  - https://juser.fz-juelich.de/record/1006648
ER  -