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Penalva YCM, Paschkowsky S, Yang J, Recinto SJ, Cinkorpumin J, Xiao B, Nitu A, Wu H, Munter HM, Michalski B, Fahnestock M, Pastor W, Bennett DA, Munter LM. Loss of the APP regulator RHBDL4 preserves memory in an Alzheimer's disease mouse model. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.22.579698. [PMID: 38464180 PMCID: PMC10925189 DOI: 10.1101/2024.02.22.579698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Characteristic cerebral pathological changes of Alzheimer's disease (AD) such as glucose hypometabolism or the accumulation of cleavage products of the amyloid precursor protein (APP), known as Aβ peptides, lead to sustained endoplasmic reticulum (ER) stress and neurodegeneration. To preserve ER homeostasis, cells activate their unfolded protein response (UPR). The rhomboid-like-protease 4 (RHBDL4) is an enzyme that participates in the UPR by targeting proteins for proteasomal degradation. We demonstrated previously that RHBLD4 cleaves APP in HEK293T cells, leading to decreased total APP and Aβ. More recently, we showed that RHBDL4 processes APP in mouse primary mixed cortical cultures as well. Here, we aim to examine the physiological relevance of RHBDL4 in the brain. We first found that brain samples from AD patients and an AD mouse model (APPtg) showed increased RHBDL4 mRNA and protein expression. To determine the effects of RHBDL4's absence on APP physiology in vivo, we crossed APPtg mice to a RHBDL4 knockout (R4 KO) model. RHBDL4 deficiency in APPtg mice led to increased total cerebral APP and Aβ levels when compared to APPtg controls. Contrary to expectations, as assessed by cognitive tests, RHBDL4 absence rescued cognition in 5-month-old female APPtg mice. Informed by unbiased RNAseq data, we demonstrated in vitro and in vivo that RHBDL4 absence leads to greater levels of active β-catenin due to decreased proteasomal clearance. Decreased β-catenin activity is known to underlie cognitive defects in APPtg mice and AD. Our work suggests that RHBDL4's increased expression in AD, in addition to regulating APP levels, leads to aberrant degradation of β-catenin, contributing to cognitive impairment.
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Affiliation(s)
- Ylauna Christine Megane Penalva
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada H3G 0B1
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada H3A 2B4
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
- Centre de Recherche en Biologie Structurale (CRBS), McGill University, Montréal H3G 0B1, Québec, Canada
| | - Sandra Paschkowsky
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada H3G 0B1
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
| | - Jingyun Yang
- Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, Illinois, USA
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, USA
| | - Sherilyn Junelle Recinto
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada H3G 0B1
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada H3A 2B4
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
| | | | - Bin Xiao
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada H3A 2B4
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
- Centre de Recherche en Biologie Structurale (CRBS), McGill University, Montréal H3G 0B1, Québec, Canada
| | - Albert Nitu
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada H3A 2B4
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
- Centre de Recherche en Biologie Structurale (CRBS), McGill University, Montréal H3G 0B1, Québec, Canada
| | - Helen Wu
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada H3G 0B1
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
| | - Hans Markus Munter
- Department of Human Genetics, McGill University, Montreal, QC, Canada H3A 0C7
| | - Bernadeta Michalski
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada
| | - Margaret Fahnestock
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada
| | - William Pastor
- Department of Biochemistry, McGill University, Montreal, QC, Canada H3G 0B1
| | - David A Bennett
- Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, Illinois, USA
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, USA
| | - Lisa Marie Munter
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada H3G 0B1
- Cell Information Systems group, Bellini Life Sciences Complex, McGill University, Montreal, QC, Canada H3G 0B1
- Centre de Recherche en Biologie Structurale (CRBS), McGill University, Montréal H3G 0B1, Québec, Canada
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Desjardins P, Berthiaume R, Couture C, Le-Bel G, Roy V, Gros-Louis F, Moulin VJ, Proulx S, Chemtob S, Germain L, Guérin SL. Impact of Exosomes Released by Different Corneal Cell Types on the Wound Healing Properties of Human Corneal Epithelial Cells. Int J Mol Sci 2022; 23:12201. [PMID: 36293057 PMCID: PMC9602716 DOI: 10.3390/ijms232012201] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/05/2022] [Accepted: 10/06/2022] [Indexed: 09/26/2023] Open
Abstract
Corneal wound healing involves communication between the different cell types that constitute the three cellular layers of the cornea (epithelium, stroma and endothelium), a process ensured in part by a category of extracellular vesicles called exosomes. In the present study, we isolated exosomes released by primary cultured human corneal epithelial cells (hCECs), corneal fibroblasts (hCFs) and corneal endothelial cells (hCEnCs) and determined whether they have wound healing characteristics of their own and to which point they modify the genetic and proteomic pattern of these cell types. Exosomes released by all three cell types significantly accelerated wound closure of scratch-wounded hCECs in vitro compared to controls (without exosomes). Profiling of activated kinases revealed that exosomes from human corneal cells caused the activation of signal transduction mediators that belong to the HSP27, STAT, β-catenin, GSK-3β and p38 pathways. Most of all, data from gene profiling analyses indicated that exosomes, irrespective of their cellular origin, alter a restricted subset of genes that are completely different between each targeted cell type (hCECs, hCFS, hCEnCs). Analysis of the genes specifically differentially regulated for a given cell-type in the microarray data using the Ingenuity Pathway Analysis (IPA) software revealed that the mean gene expression profile of hCECs cultured in the presence of exosomes would likely promote cell proliferation and migration whereas it would reduce differentiation when compared to control cells. Collectively, our findings represent a conceptual advance in understanding the mechanisms of corneal wound repair that may ultimately open new avenues for the development of novel therapeutic approaches to improve closure of corneal wounds.
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Affiliation(s)
- Pascale Desjardins
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Hôpital du Saint-Sacrement, 1050 Chemin Ste-Foy, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Rébecca Berthiaume
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Hôpital du Saint-Sacrement, 1050 Chemin Ste-Foy, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Camille Couture
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Hôpital du Saint-Sacrement, 1050 Chemin Ste-Foy, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Gaëtan Le-Bel
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Hôpital du Saint-Sacrement, 1050 Chemin Ste-Foy, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Vincent Roy
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - François Gros-Louis
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Véronique J. Moulin
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Stéphanie Proulx
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Hôpital du Saint-Sacrement, 1050 Chemin Ste-Foy, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Sylvain Chemtob
- Département d’Ophtalmologie, Faculté de Médecine, Université de Montréal, Montréal, QC H3T 1J4, Canada
| | - Lucie Germain
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
| | - Sylvain L. Guérin
- Regenerative Medicine Division of the Centre de Recherche du CHU de Québec, Université Laval, Québec, QC G1J 1Z4, Canada
- Centre Universitaire d’Ophtalmologie (CUO)-Recherche, Hôpital du Saint-Sacrement, 1050 Chemin Ste-Foy, Québec, QC G1J 1Z4, Canada
- Centre de Recherche en Organogénèse Expérimentale de l’Université Laval/LOEX, Hôpital Enfant-Jésus, 1401 18e Rue, Québec, QC G1V 0A6, Canada
- Département d’Ophtalmologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
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