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2.
JCI Insight ; 9(9)2024 Apr 02.
Article in English | MEDLINE | ID: mdl-38564292

ABSTRACT

Central for wound healing is the formation of granulation tissue, which largely consists of collagen and whose importance stretches past wound healing, including being implicated in both fibrosis and skin aging. Cyclophilin D (CyD) is a mitochondrial protein that regulates the permeability transition pore, known for its role in apoptosis and ischemia-reperfusion. To date, the role of CyD in human wound healing and collagen generation has been largely unexplored. Here, we show that CyD was upregulated in normal wounds and venous ulcers, likely adaptive as CyD inhibition impaired reepithelialization, granulation tissue formation, and wound closure in both human and pig models. Overexpression of CyD increased keratinocyte migration and fibroblast proliferation, while its inhibition reduced migration. Independent of wound healing, CyD inhibition in fibroblasts reduced collagen secretion and caused endoplasmic reticulum collagen accumulation, while its overexpression increased collagen secretion. This was confirmed in a Ppif-KO mouse model, which showed a reduction in skin collagen. Overall, this study revealed previously unreported roles of CyD in skin, with implications for wound healing and beyond.


Subject(s)
Collagen , Fibroblasts , Mice, Knockout , Peptidyl-Prolyl Isomerase F , Skin , Wound Healing , Animals , Female , Humans , Male , Mice , Cell Movement , Cell Proliferation , Collagen/metabolism , Cyclophilins/metabolism , Cyclophilins/genetics , Disease Models, Animal , Fibroblasts/metabolism , Granulation Tissue/metabolism , Granulation Tissue/pathology , Keratinocytes/metabolism , Peptidyl-Prolyl Isomerase F/metabolism , Peptidyl-Prolyl Isomerase F/genetics , Skin/metabolism , Skin/pathology , Swine , Wound Healing/physiology
3.
Sci Rep ; 14(1): 7109, 2024 03 26.
Article in English | MEDLINE | ID: mdl-38531956

ABSTRACT

Darier disease (DD) is a rare monogenetic skin disorder with limited data on its potential association with neurological disorders. This study aimed to investigate the association between DD and neurological disorders, specifically Parkinson's disease, dementias, and epilepsy. Using Swedish national registers in a period spanning between 1977 and 2013, 935 individuals with DD were compared with up to 100 comparison individuals each, randomly selected from the general population based on birth year, sex, and county of residence at the time of the first diagnosis of DD. Individuals with DD had increased risks of being diagnosed with Parkinson's disease (RR 2.1, CI 1.1; 4.4), vascular dementia (RR 2.1, CI 1.0; 4.2), and epilepsy, (RR 2.5, CI 1.8; 3.5). No association of DD with other dementias were detected. This study demonstrates a new association between DD and neurodegenerative disorders and epilepsy, underlining the need for increased awareness, interdisciplinary collaboration, and further research to understand the underlying mechanisms. Early identification and management of neurological complications in DD patients could improve treatment strategies and patient outcomes. The findings also highlight the role of SERCA2 in the pathophysiology of neurological disorders, offering new targets for future research and potentials for novel treatments.


Subject(s)
Darier Disease , Dementia , Epilepsy , Parkinson Disease , Humans , Parkinson Disease/epidemiology , Skin , Dementia/epidemiology
5.
Int J Mol Sci ; 24(23)2023 Nov 29.
Article in English | MEDLINE | ID: mdl-38069276

ABSTRACT

The mucus layer covering the skin of fish has several roles, including protection against pathogens and mechanical damage in which proteins play a key role. While proteins in the skin mucus layer of various common bony fish species have been explored, the proteins of shark skin mucus remain unexplored. In this pilot study, we examine the protein composition of the skin mucus in spiny dogfish sharks and chain catsharks through mass spectrometry (NanoLC-MS/MS). Overall, we identified 206 and 72 proteins in spiny dogfish (Squalus acanthias) and chain catsharks (Scyliorhinus retifer), respectively. Categorization showed that the proteins belonged to diverse biological processes and that most proteins were cellular albeit a significant minority were secreted, indicative of mucosal immune roles. The secreted proteins are reviewed in detail with emphasis on their immune potentials. Moreover, STRING protein-protein association network analysis showed that proteins of closely related shark species were more similar as compared to a more distantly related shark and a bony fish, although there were also significant overlaps. This study contributes to the growing field of molecular shark studies and provides a foundation for further research into the functional roles and potential human biomedical implications of shark skin mucus proteins.


Subject(s)
Sharks , Squalus acanthias , Animals , Pilot Projects , Squalus acanthias/metabolism , Tandem Mass Spectrometry
6.
Acta Derm Venereol ; 103: adv10436, 2023 Nov 28.
Article in English | MEDLINE | ID: mdl-38014829

ABSTRACT

Hailey-Hailey disease is a rare hereditary skin disease caused by mutations in the ATP2C1 gene encoding the secretory pathway Ca2+/Mn2+-ATPase 1 (SPCA1) protein. Extracutaneous manifestations of Hailey-Hailey disease are plausible but still largely unknown. The aim of this study was to explore the association between Hailey-Hailey disease and diabetes. A population-based cohort study of 347 individuals with Hailey-Hailey  disease was performed to assess the risks of type 1  diabetes and type 2 diabetes, using Swedish nationwide registries. Pedigrees from 2 Swedish families with Hailey-Hailey disease were also investigated: 1 with concurrent type 1 diabetes and HLA-DQ3, the other with type 2 diabetes. Lastly, a clinical cohort with 23 individuals with Hailey-Hailey disease and matched healthy controls was evaluated regarding diabetes. In the register data males with Hailey-Hailey disease had a 70% elevated risk of type 2 diabetes, whereas no  excess risk among women could be confirmed. In both pedigrees an unusually high inheritance for diabetes was observed. In the clinical cohort, individuals with Hailey-Hailey disease displayed a metabolic phenotype indicative of type 2 diabetes. Hailey-Hailey disease seems to act as a synergistic risk factor for diabetes. This study indicates, for the first time, an association between Hailey-Hailey disease and diabetes and represents human evidence that SPCA1 and the Golgi apparatus may be implicated in diabetes pathophysiology.


Subject(s)
Diabetes Mellitus, Type 2 , Pemphigus, Benign Familial , Male , Humans , Female , Pemphigus, Benign Familial/diagnosis , Pemphigus, Benign Familial/epidemiology , Pemphigus, Benign Familial/genetics , Diabetes Mellitus, Type 2/diagnosis , Diabetes Mellitus, Type 2/epidemiology , Diabetes Mellitus, Type 2/genetics , Pedigree , Cohort Studies , Calcium-Transporting ATPases/genetics , Calcium-Transporting ATPases/metabolism , Mutation
7.
Int J Mol Sci ; 24(18)2023 Sep 20.
Article in English | MEDLINE | ID: mdl-37762632

ABSTRACT

The mucus layer covering the skin of fish has several roles, including protection against pathogens and mechanical damage. While the mucus layers of various bony fish species have been investigated, the composition and glycan profiles of shark skin mucus remain relatively unexplored. In this pilot study, we aimed to explore the structure and composition of shark skin mucus through histological analysis and glycan profiling. Histological examination of skin samples from Atlantic spiny dogfish (Squalus acanthias) sharks and chain catsharks (Scyliorhinus retifer) revealed distinct mucin-producing cells and a mucus layer, indicating the presence of a functional mucus layer similar to bony fish mucus albeit thinner. Glycan profiling using liquid chromatography-electrospray ionization tandem mass spectrometry unveiled a diverse repertoire of mostly O-glycans in the mucus of the two sharks as well as little skate (Leucoraja erinacea). Elasmobranch glycans differ significantly from bony fish, especially in being more sulfated, and some bear resemblance to human glycans, such as gastric mucin O-glycans and H blood group-type glycans. This study contributes to the concept of shark skin having unique properties and provides a foundation for further research into the functional roles and potential biomedical implications of shark skin mucus glycans.

8.
Front Cell Dev Biol ; 11: 1252318, 2023.
Article in English | MEDLINE | ID: mdl-37771375

ABSTRACT

Mitochondria are intracellular organelles that play a critical role in numerous cellular processes including the regulation of metabolism, cellular stress response, and cell fate. Mitochondria themselves are subject to well-orchestrated regulation in order to maintain organelle and cellular homeostasis. Wound healing is a multifactorial process that involves the stringent regulation of several cell types and cellular processes. In the event of dysregulated wound healing, hard-to-heal chronic wounds form and can place a significant burden on healthcare systems. Importantly, treatment options remain limited owing to the multifactorial nature of chronic wound pathogenesis. One area that has received more attention in recent years is the role of mitochondria in wound healing. With regards to this, current literature has demonstrated an important role for mitochondria in several areas of wound healing and chronic wound pathogenesis including metabolism, apoptosis, and redox signalling. Additionally, the influence of mitochondrial dynamics and mitophagy has also been investigated. However, few studies have utilised patient tissue when studying mitochondria in wound healing, instead using various animal models. In this review we dissect the current knowledge of the role of mitochondria in wound healing and discuss how future research can potentially aid in the progression of wound healing research.

9.
J Invest Dermatol ; 143(10): 2039-2051.e10, 2023 10.
Article in English | MEDLINE | ID: mdl-37061123

ABSTRACT

Impaired skin wound healing is a significant global health issue, especially among the elderly. Wound healing is a well-orchestrated process involving the sequential phases of inflammation, proliferation, and tissue remodeling. Although wound healing is a highly dynamic and energy-requiring process, the role of metabolism remains largely unexplored. By combining transcriptomics and metabolomics of human skin biopsy samples, we mapped the core bioenergetic and metabolic changes in normal acute as well as chronic wounds in elderly subjects. We found upregulation of glycolysis, the tricarboxylic acid cycle, glutaminolysis, and ß-oxidation in the later stages of acute wound healing and in chronic wounds. To ascertain the role of these metabolic pathways on wound healing, we targeted each pathway in a wound healing assay as well as in a human skin explant model using metabolic inhibitors and stimulants. Enhancement or inhibition of glycolysis and, to a lesser extent, glutaminolysis had a far greater impact on wound healing than similar manipulations of oxidative phosphorylation and fatty acid ß-oxidation. These findings increase the understanding of wound metabolism and identify glycolysis and glutaminolysis as potential targets for therapeutic intervention.


Subject(s)
Skin , Wound Healing , Humans , Aged , Wound Healing/physiology , Skin/pathology , Metabolic Networks and Pathways , Glycolysis , Metabolomics
10.
J Wound Care ; 31(1): 4-11, 2022 Jan 02.
Article in English | MEDLINE | ID: mdl-35077209

ABSTRACT

Managing painful hard-to-heal leg ulcers is challenging with current therapeutic options. Wounds are prone to being hypoxic, and the subsequent pain is often related to hypoxia. Hyperbaric oxygen therapy (HBOT) is used to treat hard-to-heal leg wounds by delivering 100% oxygen at a pressure 2-3 times higher than atmospheric pressure. Unfortunately, most patients cannot be offered HBOT because it is costly and needs to be applied at specialised centres. Therefore, topical continuous oxygen therapy (TCOT) is a novel alternative for continuous local oxygen delivery to wounds and is associated with improved wound healing; however, its effect on painful wounds is unknown. This retrospective study was conducted on 20 patients, of whom 17 had painful hard-to-heal leg ulcers. In 13 patients (76%) with painful ulcers, TCOT was associated with rapid and substantial pain alleviation. Also, eight (40%) of the patients' wounds healed entirely with TCOT. This study suggests that TCOT may represent a novel pain management device for hard-to-heal wounds.


Subject(s)
Leg Ulcer , Oxygen , Humans , Leg Ulcer/therapy , Pain/etiology , Retrospective Studies , Wound Healing
11.
Acta Derm Venereol ; 101(6): adv00476, 2021 Jun 22.
Article in English | MEDLINE | ID: mdl-33928397

ABSTRACT

Darier disease and Hailey-Hailey disease are severe, monogenetic dermatological disorders with mutations affecting all cells, making them liable to exhibit extra-dermal symptoms. The aim of this study is to assess broad cognitive function in individuals with these diseases, using an experimental, case-control set-up comparing cognition in patients with that in healthy controls matched for age, sex and level of education. Cognition was assessed with the Cambridge Neuropsycho-logical Test Automated Battery. Patients with Darier disease (n = 29) performed significantly poorer on 5 of the 10 key cognitive measurements, while patients with Hailey-Hailey disease (n = 25) did not perform differently from controls. The main conclusion is that patients with Darier disease exhibit significant impairment in cognitive function, which reinforces the view that Darier disease should be regarded as a disorder affecting multiple organs, and should therefore be given medical consideration, and possibly treat-ment, as such.


Subject(s)
Cognitive Dysfunction , Darier Disease , Pemphigus, Benign Familial , Case-Control Studies , Darier Disease/diagnosis , Darier Disease/genetics , Humans , Mutation , Pemphigus, Benign Familial/diagnosis , Pemphigus, Benign Familial/genetics
12.
Acta Derm Venereol ; 101(4): adv00430, 2021 Apr 15.
Article in English | MEDLINE | ID: mdl-33606037

ABSTRACT

Darier disease is a severe, rare autosomal dominant inherited skin condition caused by mutations in the ATP2A2 gene encoding sarcoendoplasmic reticulum Ca2+-ATPase isoform 2 in the endoplasmic reticulum. Since sarcoendoplasmic reticulum Ca2+-ATPase isoform 2 is expressed in most tissues, and intracellular calcium homeostasis is of fundamental importance, it is conceivable that other organs besides the skin may be involved in Darier disease. This review focusses on the association of Darier disease with other organ dysfunctions and diseases, emphasizing their common molecular pathology. In conclusion, Darier disease should be considered a systemic condition that requires systemic and disease mechanism targeted treatments.


Subject(s)
Darier Disease , Darier Disease/diagnosis , Darier Disease/genetics , Humans , Mutation , Sarcoplasmic Reticulum Calcium-Transporting ATPases/genetics , Skin/metabolism
13.
Int Wound J ; 18(1): 49-61, 2021 Feb.
Article in English | MEDLINE | ID: mdl-33225583

ABSTRACT

During wound healing, cells have a high rate of protein synthesis and many proteins need to be folded post-translationally to function, which occurs in the endoplasmic reticulum (ER). In addition to proliferation, several cellular stress conditions, such as hypoxia, in the wound micro-environment lead to the accumulation of unfolded or misfolded proteins in the ER, causing ER stress. Eukaryotic cells have a signalling system to manage ER stress called the unfolded protein response (UPR). Mild UPR activation has a beneficial homeostatic effect; however, excessive UPR induces cell death. Herein, we examined venous leg ulcer biopsies versus normal acute incisional wounds in age-matched elderly subjects and found a large increase in ER stress markers. To study the underlying mechanism, we established several cell cultures from amputated legs from the elderly that showed inherent ER stress. While both keratinocytes and fibroblasts migration was impaired by ER stress, migration of elderly leg skin keratinocytes was markedly improved after treatment with the chemical chaperone and clinically established drug 4-phenylbutyrate (4-PBA) and demonstrated a reduction in ER stress markers. In a full-thickness human skin wound healing model, 4-PBA improved the reepithelialisation rate, which suggests it as a promising drug repurposing candidate for wound healing.


Subject(s)
Endoplasmic Reticulum Stress , Phenylbutyrates , Wound Healing , Fibroblasts , Humans , Keratinocytes , Middle Aged , Phenylbutyrates/therapeutic use , Unfolded Protein Response , Varicose Ulcer
14.
Sci Rep ; 10(1): 6886, 2020 04 23.
Article in English | MEDLINE | ID: mdl-32327688

ABSTRACT

Human data supporting a role for endoplasmic reticulum (ER) stress and calcium dyshomeostasis in heart disease is scarce. Darier disease (DD) is a hereditary skin disease caused by mutations in the ATP2A2 gene encoding the sarcoendoplasmic-reticulum Ca2+ ATPase isoform 2 (SERCA2), which causes calcium dyshomeostasis and ER stress. We hypothesized that DD patients would have an increased risk for common heart disease. We performed a cross-sectional case-control clinical study on 25 DD patients and 25 matched controls; and a population-based cohort study on 935 subjects with DD and matched comparison subjects. Main outcomes and measures were N-terminal pro-brain natriuretic peptide, ECG and heart diagnosis (myocardial infarction, heart failure and arrythmia). DD subjects showed normal clinical heart phenotype including heart failure markers and ECG. The risk for heart failure was 1.59 (1,16-2,19) times elevated in DD subjects, while no major differences were found in myocardial infarcation or arrhythmias. Risk for heart failure when corrected for cardivascular risk factors or alcohol misuse was 1.53 (1.11-2.11) and 1.58 (1,15-2,18) respectively. Notably, heart failure occurred several years earlier in DD patients as compared to controls. We conclude that DD patients show a disease specific increased risk of heart failure which should be taken into account in patient management. The observation also strenghtens the clinical evidence on the important role of SERCA2 in heart failure pathophysiology.


Subject(s)
Darier Disease/complications , Heart Failure/complications , Adult , Aged , Biomarkers/metabolism , Case-Control Studies , Cross-Sectional Studies , Darier Disease/diagnostic imaging , Darier Disease/enzymology , Darier Disease/physiopathology , Electrocardiography , Female , Heart Failure/diagnostic imaging , Heart Failure/enzymology , Heart Failure/physiopathology , Humans , Lipids/blood , Male , Middle Aged , Mutation/genetics , Risk Factors , Sarcoplasmic Reticulum Calcium-Transporting ATPases/genetics , Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism
15.
Diabetol Metab Syndr ; 12: 12, 2020.
Article in English | MEDLINE | ID: mdl-32042314

ABSTRACT

BACKGROUND: Human data supporting a role for endoplasmic reticulum (ER) stress and calcium dyshomeostasis in diabetes is scarce. Darier disease (DD) is a hereditary skin disease caused by mutations in the ATP2A2 gene encoding the sarcoendoplasmic-reticulum ATPase 2 (SERCA2) calcium pump, which causes calcium dyshomeostasis and ER stress. We hypothesize that DD patients have a diabetes-like metabolic phenotype and the objective of this study was to examine the association between DD with impaired glucose tolerance and diabetes. METHODS: Cross-sectional clinical study on 25 DD patients and 25 matched controls. Metabolic status was assessed primarily by fasting blood glucose, oral glucose tolerance test, HOMA2-%S (insulin resistence) and HOMA2-%B (beta cell function). RESULTS: DD subjects showed normal oral glucose tolerance test and HOMA2-%S, while fasting blood glucose was lower and c-peptide as well as HOMA2-%B was higher. CONCLUSION: Increased HOMA2-%B values are indicative of increased basal insulin secretion which is a type of beta cell dysfunction associated to diabetes development. These results supports a role of ER stress in diabetes pathophysiology and contribute to the understanding of DD as a multi-organ syndrome.

18.
Diabetologia ; 59(7): 1480-1491, 2016 07.
Article in English | MEDLINE | ID: mdl-26831301

ABSTRACT

AIMS/HYPOTHESIS: We studied the role of protein degradation pathways in the regulation of insulin production and secretion and hypothesised that autophagy regulates proinsulin degradation, thereby modulating beta cell function. METHODS: Proinsulin localisation in autophagosomes was demonstrated by confocal and electron microscopy. Autophagy was inhibited by knockdown of autophagy-related (ATG) proteins and using the H(+)-ATPase inhibitor bafilomycin-A1. Proinsulin and insulin content and secretion were assessed in static incubations by ELISA and RIA. RESULTS: Confocal and electron microscopy showed proinsulin localised in autophagosomes and lysosomes. Beta-Atg7 (-/-) mice had proinsulin-containing sequestosome 1 (p62 [also known as SQSTM1])(+) aggregates in beta cells, indicating proinsulin is regulated by autophagy in vivo. Short-term bafilomycin-A1 treatment and ATG5/7 knockdown increased steady-state proinsulin and hormone precursor chromogranin A content. ATG5/7 knockdown also increased glucose- and non-fuel-stimulated insulin secretion. Finally, mutated forms of proinsulin that are irreparably misfolded and trapped in the endoplasmic reticulum are more resistant to degradation by autophagy. CONCLUSIONS/INTERPRETATION: In the beta cell, transport-competent secretory peptide precursors, including proinsulin, are regulated by autophagy, whereas efficient clearance of transport-incompetent mutated forms of proinsulin by alternative degradative pathways may be necessary to avoid beta cell proteotoxicity. Reduction of autophagic degradation of proinsulin increases its residency in the secretory pathway, followed by enhanced secretion in response to stimuli.


Subject(s)
Autophagy/physiology , Insulin/metabolism , Animals , Autophagy/genetics , Autophagy-Related Protein 7/genetics , Autophagy-Related Protein 7/metabolism , Blotting, Western , Cell Line , Homeostasis/genetics , Homeostasis/physiology , Humans , Insulin-Secreting Cells/metabolism , Mice , Mice, Inbred C57BL , Mice, Knockout , Microscopy, Electron , Oxygen Consumption/genetics , Oxygen Consumption/physiology , RNA Interference/physiology
19.
Mol Endocrinol ; 27(10): 1706-23, 2013 Oct.
Article in English | MEDLINE | ID: mdl-23979843

ABSTRACT

Experimental lipotoxicity constitutes a model for ß-cell demise induced by metabolic stress in obesity and type 2 diabetes. Fatty acid excess induces endoplasmic reticulum (ER) stress, which is accompanied by ER morphological changes whose mechanisms and relevance are unknown. We found that the GTPase dynamin-related protein 1 (DRP1), a key regulator of mitochondrial fission, is an ER resident regulating ER morphology in stressed ß-cells. Inhibition of DRP1 activity using a GTP hydrolysis-defective mutant (Ad-K38A) attenuated fatty acid-induced ER expansion and mitochondrial fission. Strikingly, stimulating the key energy-sensor AMP-activated protein kinase (AMPK) increased the phosphorylation at the anti-fission site Serine 637 and largely prevented the alterations in ER and mitochondrial morphology. Expression of a DRP1 mutant resistant to phosphorylation at this position partially prevented the recovery of ER and mitochondrial morphology by AMPK. Fatty acid-induced ER enlargement was associated with proinsulin retention in the ER, together with increased proinsulin/insulin ratio. Stimulation of AMPK prevented these alterations, as well as mitochondrial fragmentation and apoptosis. In summary, DRP1 regulation by AMPK delineates a novel pathway controlling ER and mitochondrial morphology, thereby modulating the response of ß-cells to metabolic stress. DRP1 may thus function as a node integrating signals from stress regulators, such as AMPK, to coordinate organelle shape and function.


Subject(s)
Dynamins/metabolism , Endoplasmic Reticulum Stress , Endoplasmic Reticulum/enzymology , Insulin-Secreting Cells/enzymology , Adenylate Kinase/metabolism , Animals , Apoptosis , Cell Line , Diabetes Mellitus, Type 2/enzymology , Diabetes Mellitus, Type 2/pathology , Endoplasmic Reticulum/pathology , Enzyme Activation , Male , Mice , Mice, Inbred C57BL , Mitochondria/enzymology , Obesity/enzymology , Obesity/pathology , Organelle Shape , Palmitates/pharmacology , Phosphorylation , Unfolded Protein Response
20.
Autophagy ; 9(4): 626-8, 2013 Apr.
Article in English | MEDLINE | ID: mdl-23380813

ABSTRACT

Pancreatic ß-cell dysfunction is central in diabetes. The diabetic milieu may impair proinsulin folding, leading to ß-cell endoplasmic reticulum (ER) stress and apoptosis, and thus a worsening of the diabetes. Autophagy is crucial for the well-being of the ß-cell; however, the impact of stimulating autophagy on ß-cell adaptation to ER stress is unknown. We studied the crosstalk between ER stress and autophagy in a rodent model of diabetes, called Akita, in which proinsulin gene mutation leads to protein misfolding and ß-cell demise. We found that proinsulin misfolding stimulates autophagy and, in symmetry, inhibition of autophagy induces ß-cell stress and apoptosis. Under conditions of excessive proinsulin misfolding, stimulation of autophagy by inhibiting MTORC1 alleviates stress and prevents apoptosis. Moreover, treatment of diabetic Akita mice with the MTORC1 inhibitor rapamycin improves diabetes and prevents ß-cell apoptosis. Thus, autophagy is a central adaptive mechanism in ß-cell stress. Stimulation of autophagy may become a novel therapeutic strategy in diabetes.


Subject(s)
Autophagy , Diabetes Mellitus/pathology , Endoplasmic Reticulum Stress , Animals , Diabetes Mellitus/metabolism , Endoplasmic Reticulum/metabolism , Humans , Insulin-Secreting Cells/metabolism , Insulin-Secreting Cells/pathology , Mice , Models, Biological , Mutation/genetics , Signal Transduction
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