Collagen Alpha Research Articles

Associations of circulating proteins with lipoprotein profiles: proteomic analyses from the OmniHeart randomized trial and the Atherosclerosis Risk in Communities (ARIC) Study

BackgroundWithin healthy dietary patterns, manipulation of the proportion of macronutrient can reduce CVD risk. However, the biological pathways underlying healthy diet-disease associations are poorly understood. Using an untargeted, large-scale proteomic profiling, we aimed to (1) identify proteins mediating the association between healthy dietary patterns varying in the proportion of macronutrient and lipoproteins, and (2) validate the associations between diet-related proteins and lipoproteins in the Atherosclerosis Risk in Communities (ARIC) Study.MethodsIn 140 adults from the OmniHeart trial, a randomized, cross-over, controlled feeding study with 3 intervention periods (carbohydrate-rich; protein-rich; unsaturated fat-rich dietary patterns), 4,958 proteins were quantified at the end of each diet intervention period using an aptamer assay (SomaLogic). We assessed differences in log2-transformed proteins in 3 between-diet comparisons using paired t-tests, examined the associations between diet-related proteins and lipoproteins using linear regression, and identified proteins mediating these associations using a causal mediation analysis. Levels of diet-related proteins and lipoprotein associations were validated in the ARIC study (n = 11,201) using multivariable linear regression models, adjusting for important confounders.ResultsThree between-diet comparisons identified 497 significantly different proteins (protein-rich vs. carbohydrate-rich = 18; unsaturated fat-rich vs. carbohydrate-rich = 335; protein-rich vs. unsaturated fat-rich dietary patterns = 398). Of these, 9 proteins [apolipoprotein M, afamin, collagen alpha-3(VI) chain, chitinase-3-like protein 1, inhibin beta A chain, palmitoleoyl-protein carboxylesterase NOTUM, cathelicidin antimicrobial peptide, guanylate-binding protein 2, COP9 signalosome complex subunit 7b] were positively associated with lipoproteins [high-density lipoprotein (HDL)-cholesterol (C) = 2; triglyceride = 5; non-HDL-C = 3; total cholesterol to HDL-C ratio = 1]. Another protein, sodium-coupled monocarboxylate transporter 1, was inversely associated with HDL-C and positively associated with total cholesterol to HDL-C ratio. The proportion of the association between diet and lipoproteins mediated by these 10 proteins ranged from 21 to 98%. All of the associations between diet-related proteins and lipoproteins were significant in the ARIC study, except for afamin.ConclusionsWe identified proteins that mediate the association between healthy dietary patterns varying in macronutrients and lipoproteins in a randomized feeding study and an observational study.Trial registrationNCT00051350 at clinicaltrials.gov.

High levels of intracellular endotrophin in adipocytes mediate COPII vesicle supplies to autophagosome to impair autophagic flux and contribute to systemic insulin resistance in obesity

Background and aimsExtracellular matrix (ECM) homeostasis plays a crucial role in metabolic plasticity and endocrine function of adipose tissue. High levels of intracellular endotrophin, a cleavage peptide of type VI collagen alpha 3 chain (Col6a3), have been frequently observed in adipocyte in obesity and diabetes. However, how endotrophin intracellularly traffics and influences metabolic homeostasis in adipocyte remains unknown. Therefore, we aimed to investigate the trafficking of endotrophin and its metabolic effects in adipocytes depending on lean or obese condition. MethodsWe used doxycycline-inducible adipocyte-specific endotrophin overexpressed mice for a gain-of-function study and CRISPR-Cas9 system-based Col6a3-deficient mice for a loss-of-function study. Various molecular and biochemical techniques were employed to examine the effects of endotrophin on metabolic parameters. ResultsIn adipocytes during obesity, the majority of endosomal endotrophin escapes lysosomal degradation and is released into the cytosol to mediate direct interactions between SEC13, a major component of coat protein complex II (COPII) vesicles, and autophagy-related 7 (ATG7), leading to the increased formation of autophagosomes. Autophagosome accumulation disrupts the balance of autophagic flux, resulting in adipocyte death, inflammation, and insulin resistance. These adverse metabolic effects were ameliorated by either suppressing ATG7 with siRNA ex vivo or neutralizing endotrophin with monoclonal antibodies in vivo. ConclusionsHigh levels of intracellular endotrophin-mediated autophagic flux impairment in adipocyte contribute to metabolic dysfunction such as apoptosis, inflammation, and insulin resistance in obesity.

COMBINING RENIN-ANGIOTENSIN SYSTEM (RAS) BLOCKADE AND SODIUM-GLUCOSE COTRANSPORTER-2 (SGLT2) INHIBITION IN EXPERIMENTAL DIABETES RESULTS IN SYNERGISTIC BENEFICIAL EFFECTS

Objective: To study the combined effect of RAS blockade and SGLT2i in experimental diabetes. Design and method: TGR (mREN2)27 rats (a model of angiotensin II-dependent hypertension) were made diabetic with streptozotocin for 12 weeks and treated with either vehicle, the angiotensin receptor blocker valsartan (VAL: 4 mg/kg/day), the SGLT2 inhibitor empagliflozin (EMPA: 10 mg/kg/day) or their combination during the final 3 weeks. Mean arterial blood pressure (MAP) was measured by telemetry. Results: MAP before treatment was 120 ± 14 mm Hg. Diabetes resulted in albuminuria, accompanied by glomerulosclerosis, without a change in glomerular filtration rate (GFR). EMPA did not lower MAP, while VAL did (by 29 ± 7 mm Hg), and when combined the MAP drop was largest (44 ± 6 mm Hg). Only EMPA+VAL reduced the heart weight/tibia length ratio (P = 0.04 vs. vehicle). VAL, but not EMPA, increased plasma renin, and the largest renin rise was observed during EMPA+VAL (P < 0.0001 vs. vehicle) Although both VAL and EMPA alone tended to diminish albuminuria, the reduction was significant (P = 0.01 vs. vehicle) only when both drugs were combined (vehicle, VAL, EMPA and EMPA+VAL 108 ± 18, 89 ± 24, 55 ± 8 and 26 ± 6 ug/mL, respectively). This was accompanied by a reduction in glomerulosclerosis index and no change in GFR. EMPA either alone or in combination with VAL increased water intake and urine production and induced urinary glucose loss, and as a consequence reduced blood glucose and body weight. Renal expression of the fibrosis and inflammatory markers TIMP2, collagen 1alpha 1, fibronectin, Neph1, nephrin was lowest in the dual treatment group. Conclusions: RAS blockade and SGLT2i display synergistic beneficial effects on blood pressure, kidney jury and cardiac hypertrophy in a rat with hypertension and diabetes.

Identification of Growth-Related SNPs and Genes in the Genome of the Pearl Oyster (Pinctada fucata) Using GWAS

Pinctada fucata, the pearl oyster, is a bivalve primarily cultivated for the production of saltwater pearls. In this study, the genome-wide association study (GWAS) for the growth-related traits and a principal components analysis (PCA) in P. fucata were performed. Genomic parameters of 6 growth-related traits in 60 individuals were estimated by using 4,937,162 single-nucleotide polymorphisms (SNPs). A total of 45 SNPs associated with growth traits were thus identified. Furthermore, 165 candidate genes were identified, including collagen alpha-3 (VI), serine/threonine-protein kinase mos-like harboring significant markers, and histidine-rich protein PFHRP-III-like, which may influence growth-related traits associated with various biological processes. The results of this study can facilitate marker-assisted selection and breeding programs designed to enhance growth and also offer a theoretical foundation for the further development and utilization of genomic resources in P. fucata.

Profiling of idiopathic macular hole vitreous proteome identifies the role of extracellular matrix remodelling, epithelial–mesenchymal transformation and unfolded protein-response pathways

Purpose: To analyze and describe the proteome of the vitreous humour in eyes with idiopathic macular holes. Methods: We performed mass spectrometry (MS)-based label-free quantitative analysis of the vitreous proteome of idiopathic macular hole (IMH) and control donor vitreous. Comparative quantification was performed using SCAFFOLD software which calculated fold changes of differential expression. Bioinformatics analysis was performed using DAVID and STRING software. Results: A total of 448 proteins were identified by LC-MS/MS in IMH and cadaveric eye vitreous samples, of which 199 proteins were common. IMH samples had 189 proteins that were unique and 60 proteins were present only in the control cadaveric vitreous. We found upregulation of several extracellular matrix (ECM) and cytoskeletal proteins, namely collagen alpha-1 (XVIII) chain, N-cadherin, EFEMP1/fibulin-3, basement membrane-specific heparan sulfate proteoglycan core protein, and target of Nesh-3. Several cytoskeleton proteins, namely tubulin, actin, and fibronectin levels, were significantly lower in IMH vitreous, probably reflecting increased ECM degradation. IMH vitreous also had a downregulation of unfolded protein response-mediated-mediated apoptosis proteins, possibly related to a state of increased cell survival and proliferation, along with a remodelling and aberrant production of ECM contents. Conclusion: The pathogenesis of macular holes may involve ECM remodelling, epithelial–mesenchymal transformation, downregulation of apoptosis, protein folding defects, and complement pathway. The vitreo-retinal milieu in macular holes contain molecules related to both ECM degradation and inhibition of the same, thereby maintaining a homeostasis.

A Systematic Study of Traditional Chinese Medicine for the Treatment of Lung Adenocarcinoma Using a Reverse Network of Key Targets Based on Bioinformatics and Molecular Docking: Curcumin and Trans-Resveratrol as Potential Drug Candidates for Lung Adenocarcinoma

Background Lung adenocarcinoma (LUAD) is a dominant tumor with high morbidity and mortality. In spite of innovations in surgery, chemotherapy, and targeted therapies, the prognosis for patients with LUAD remains unsatisfactory. Therefore, it is particularly important to study the biological markers of the occurrence, development, and prognosis of this disease. Methods In this study, 3 datasets were selected from the Gene Expression Omnibus (GEO) database to screen differentially expressed genes (DEGs). Then, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were performed using Database Annotation, Visualization and Integrated Discovery (DAVID). In addition, a protein-protein interaction network was performed and 10 key genes were analyzed. Gene and protein expression were analyzed using The Cancer Genome Atlas (TCGA) and The Human Protein Atlas (HPA) databases, respectively. Then, overall survival (OS) rate was analyzed using Kaplan-Meier plotter database. The chemical components were downloaded from the HERB database. Finally, the chemical constituents were docked with 10 targets by molecular docking. By using in vitro studies, we evaluated the effects of curcumin and trans-resveratrol on the proliferation of LUAD cells. Results A total of 122 upregulated and 434 downregulated genes were identified. Then, 10 key genes (glyceraldehyde-3-phosphate dehydrogenase (GAPDH), interleukin-1 beta (IL1B), von Willebrand factor (VWF), matrix metalloproteinase-9 (MMP9), CD44 antigen (CD44), transcription factor Jun (JUN), platelet endothelial cell adhesion molecule (PECAM1), hematopoietic progenitor cell antigen CD34 (CD34), peroxisome proliferator-activated receptor gamma (PPARG), and collagen alpha-1(I) chain (COL1A1)) were obtained. TCGA results showed that GAPDH, MMP9, and COL1A1 were upregulated, while IL-1B, VWF, CD44, JUN, PECAM1, CD34, and PPARG were downregulated in cancer tissues. Kaplan-Meier plotter analysis also showed that high expression of GAPDH, PPARG, and COL1A1, and low expression of VWF, PECAM1, CD34, PPARG, and COL1A1 were associated with poor prognosis in LUAD. Combined with gene expression, staging, immunohistochemistry, and OS prognostic analysis, the results showed that COL1A1 was a potential target for the occurrence and prognosis of LUAD. In addition, 2 key components (curcumin and trans-resveratrol) had good docking effect with COL1A1. We found that curcumin and trans-resveratrol significantly inhibited the proliferation of LUAD cells and significantly decreased the expression of COL1A1 and MMP9. Conclusion In conclusion, our study identified the potential target of LUAD and the main traditional Chinese medicine components (curcumin and trans-resveratrol) for LUAD treatment. This study provides potential therapeutic targets and treatment strategies for the treatment of LUAD.

Biological injection therapy with leukocyte-poor platelet-rich plasma induces cellular alterations, enhancement of lubricin, and inflammatory downregulation in vivo in human knees: A controlled, prospective human clinical trial based on mass spectrometry imaging analysis.

To investigate the in vivo biological effects of leukocyte-poor platelet-rich plasma (LpPRP) treatment in human synovial layer to establish the cellular basis for a prolonged clinical improvement. Synovial tissues (n = 367) were prospectively collected from patients undergoing arthroscopic surgery. Autologous-conditioned plasma, LpPRP, was injected into the knees of 163 patients 1-7 days before surgery to reduce operative trauma and inflammation, and to induce the onset of regeneration. A total of 204 patients did not receive any injection. All samples were analyzed by mass spectrometry imaging. Data analysis was evaluated by clustering, classification, and investigation of predictive peptides. Peptide identification was done by tandem mass spectrometry and database matching. Data analysis revealed two major clusters belonging to LpPRP-treated (LpPRP-1) and untreated (LpPRP-0) patients. Classification analysis showed a discrimination accuracy of 82%-90%. We identified discriminating peptides for CD45 and CD29 receptors (receptor-type tyrosine-protein phosphatase C and integrin beta 1), indicating an enhancement of musculoskeletal stem cells, as well as an enhancement of lubricin, collagen alpha-1-(I) chain, and interleukin-receptor-17-E, dampening the inflammatory reaction in the LpPRP-1 group following LpPRP injection. We could demonstrate for the first time that injection therapy using "autologic-conditioned biologics" may lead to cellular changes in the synovial membrane that might explain the reported prolonged beneficial clinical effects. Here, we show in vivo cellular changes, possibly based on muscular skeletal stem cell alterations, in the synovial layer. The gliding capacities of joints might be improved by enhancing of lubricin, anti-inflammation by activation of interleukin-17 receptor E, and reduction of the inflammatory process by blocking interleukin-17.

Comparative- and network-based proteomic analysis of bacterial chondronecrosis with osteomyelitis lesions in broiler’s proximal tibiae identifies new molecular signatures of lameness

Bacterial Chondronecrosis with Osteomyelitis (BCO) is a specific cause of lameness in commercial fast-growing broiler (meat-type) chickens and represents significant economic, health, and wellbeing burdens. However, the molecular mechanisms underlying the pathogenesis remain poorly understood. This study represents the first comprehensive characterization of the proximal tibia proteome from healthy and BCO chickens. Among a total of 547 proteins identified, 222 were differentially expressed (DE) with 158 up- and 64 down-regulated proteins in tibia of BCO vs. normal chickens. Biological function analysis using Ingenuity Pathways showed that the DE proteins were associated with a variety of diseases including cell death, organismal injury, skeletal and muscular disorder, immunological and inflammatory diseases. Canonical pathway and protein–protein interaction network analysis indicated that these DE proteins were involved in stress response, unfolded protein response, ribosomal protein dysfunction, and actin cytoskeleton signaling. Further, we identified proteins involved in bone resorption (osteoclast-stimulating factor 1, OSFT1) and bone structural integrity (collagen alpha-2 (I) chain, COL2A1), as potential key proteins involved in bone attrition. These results provide new insights by identifying key protein candidates involved in BCO and will have significant impact in understanding BCO pathogenesis.

Identifying a urinary peptidomics profile for hypertension in young adults: The African-PREDICT study: Urinary peptidomics and hypertension: Urinary peptidomics and hypertension.

Hypertension is one of the most important and complex risk factors for cardiovascular diseases (CVDs). By using urinary peptidomics analyses, we aimed to identify peptides associated with hypertension, building a framework for future research towards improved prediction and prevention of premature development of CVD. We included 78 hypertensive and 79 normotensive participants from the African-PREDICT study (aged 20-30 years), matched for sex (51% male) and ethnicity (49% black and 51% white). Urinary peptidomics data were acquired using capillary-electrophoresis-time-of-flight-mass-spectrometry. Hypertension-associated peptides were identified and combined into a support vector machine-based multidimensional classifier. When comparing the peptide data between the normotensive and hypertensive groups, 129 peptides were nominally differentially abundant (Wilcoxon p<0.05). Nonetheless, only three peptides, all derived from collagen alpha-1(III), remained significantly different after rigorous adjustments for multiple comparisons. The 37 most significant peptides (all p ≤ 0.001) served as basis for the development of a classifier, with 20 peptides being combined into a unifying score, resulting in an AUC of 0.85 in the ROC analysis (p<0.001), with 83% sensitivity at 80% specificity. Our study suggests potential value of urinary peptides in the classification of hypertension, which could enable earlier diagnosis and better understanding of the pathophysiology of hypertension and premature cardiovascular disease development.

Inhibition of TRADD ameliorates chondrocyte necroptosis and osteoarthritis by blocking RIPK1-TAK1 pathway and restoring autophagy

Osteoarthritis (OA) is an age-related disease characterized by cartilage degeneration. TNFR1-associated death domain protein (TRADD) is a key upstream molecule of TNF-α signals but its role in OA pathogenesis is unknown. This study aimed to verify that whether inhibition of TRADD could protect against chondrocyte necroptosis and OA, and further elucidate the underlying mechanism. We demonstrated that TNF-α-related OA-like phenotypes including inflammation response, extracellular matrix degradation, apoptosis, and necroptosis in chondrocytes were inhibited by TRADD deficiency. Furthermore, TRADD interacted with TRAF2 and knockdown of TRADD suppressed the activation of RIPK1-TAK1-NF-κB signals and restored impaired autophagy. ICCB-19, the selective inhibitor of TRADD, also attenuated necroptosis in chondrocytes. Mechanismly, ICCB-19 blocked the phosphorylation of TAK1-NF-κB signals and restored impaired autophagy, whereas inhibiting autophagic process with 3-Methyladenine compromised these effects of ICCB-19. The in vivo study showed that the intra-articular injection of ICCB-19 rescued the expression of collagen alpha-1(II) chain and LC3, and mitigated the cartilage degeneration of OA mice. This study demonstrates that TRADD mediates TNF-α-induced necroptosis and OA-like phenotypes of chondrocytes and suggests that ICCB-19 suppresses chondrocyte damage and cartilage degeneration by inhibiting TNF-α-TRADD-mediated signals and dysregulation of autophagy in chondrocytes. ICCB-19 may serve as an important option for OA therapy.

Proteomic analysis of small intestinal neuroendocrine tumors and mesenteric fibrosis.

Mesenteric metastases in small intestinal neuroendocrine tumors (SI-NETs) are associated with mesenteric fibrosis (MF) in a proportion of patients. MF can induce severe abdominal complications, and an effective preventive treatment is lacking. To elucidate possible novel therapeutic targets, we performed a proteomics-based analysis of MF. The tumor cell and stromal compartment of primary tumors and paired mesenteric metastases of SI-NET patients with MF (n = 6) and without MF (n = 6) was analyzed by liquid chromatography-mass spectrometry-based proteomics. Analysis of differential protein abundance was performed. Collagen alpha-1(XII) (COL12A1) and complement component C9 (C9) expression was evaluated by immunohistochemistry (IHC) in mesenteric metastases. A total of 2988 proteins were identified. Unsupervised hierarchical clustering showed close clustering of paired primary and mesenteric tumor cell samples. Comparing MF to non-MF samples, we detected differentially protein abundance solely in the mesenteric metastasis stroma group. There was no differential abundance of proteins in tumor cell samples or primary tumor stroma samples. Analysis of the differentially abundant proteins (n = 36) revealed higher abundance in MF samples of C9, various collagens and proteoglycans associated with profibrotic extracellular matrix dysregulation and signaling pathways. Proteins involved in fatty acid oxidation showed a lower abundance. COL12A1 and C9 were confirmed by IHC to have significantly higher expression in MF mesenteric metastases compared to non-MF. In conclusion, proteome profiles of SI-NETs with and without MF differ primarily in the stromal compartment of mesenteric metastases. Analysis of differentially abundant proteins revealed possible new signaling pathways involved in MF development. In conclusion, proteome profiles of SI-NETs with and without MF differ primarily in the stromal compartment of mesenteric metastases. Analysis of differentially abundant proteins revealed possible new signaling pathways involved in MF development.

COL1A2 inhibition suppresses glioblastoma cell proliferation and invasion.

An extracellular matrix such as collagen is an essential component of the tumor microenvironment. Collagen alpha-2(I) chain (COL1A2) is a chain of type I collagen whose triple helix comprises two alpha-1 chains and one alpha-2 chain. The authors' proteomics data showed that COL1A2 is significantly higher in the blood of patients with glioblastoma (GBM) compared with healthy controls. COL1A2 has many different functions in various types of cancers. However, the functions of COL1A2 in GBM are poorly understood. In this study, the authors analyzed the functions of COL1A2 and its signaling pathways in GBM. Surgical specimens and GBM cell lines (T98, U87, and U251) were used. The expression level of COL1A2 was examined using GBM tissues and normal brain tissues by quantitative real-time polymerase chain reaction. The clinical significance of these levels was evaluated using Kaplan-Meier analysis. Small interfering RNA (siRNA) and small hairpin RNA of COL1A2 were transfected into GBM cell lines to investigate the function of COL1A2 in vitro and in vivo. Flow cytometry was introduced to analyze the alteration of cell cycles. Western blot and immunohistochemistry were performed to analyze the underlying mechanisms. The expression level of COL1A2 was upregulated in GBM compared with normal brain tissues. A higher expression of COL1A2 was correlated with poor progression-free survival and overall survival. COL1A2 inhibition significantly suppressed cell proliferation in vitro and in vivo, likely due to G1 arrest. The invasion ability was notably deteriorated by inhibiting COL1A2. Cyclin D1, cyclin-dependent kinase 1, and cyclin-dependent kinase 4, which are involved in the cell cycle, were all downregulated after blockade of COL1A2 in vitro and in vivo. Phosphoinositide 3-kinase inhibitor reduced the expression of COL1A2. Although downregulation of COL1A2 decreased the protein kinase B (Akt) phosphorylation, Akt activator can phosphorylate Akt in siRNA-treated cells. This finding suggests that Akt phosphorylation is partially dependent on COL1A2. COL1A2 plays an important role in driving GBM progression. COL1A2 inhibition attenuated GBM proliferation by promoting cell cycle arrest, indicating that COL1A2 could be a promising therapeutic target for GBM treatment.

A case of Alport syndrome

Alport syndrome is an inherited disease characterized by progressive renal failure, hearing loss and ocular abnormalities. It usually manifests as progressive form of glomerular disease that is often associated with sensorineural hearing loss and ocular abnormalities. The defects are caused by mutations in the genes that code for type IV collagen's alpha chains, which are the most important structural elements of basement membranes, including those in the kidney, cochlea, and eye. We present a 37-year-old female known case of chronic kidney disease on medical management came with complaints of shortness of breath and loss of appetite. Her 2 children are also affected. Her renal biopsy showed glomerulosclerosis, splitting, lamination of basement membrane. Pure tone audiometry revealed bilateral sensorineural hearing loss. Slit lamp examination showed bilateral lenticonus and distant direct ophthalmoscopy revealed oil droplet sign which confirms lenticonus with dot and fleck retinopathy. Hence diagnosed as a previously undetected case of Alport syndrome.

Effect of boiling on texture of scallop adductor muscles and its mechanism based on label-free quantitative proteomic technique

The mechanism behind textural changes in scallop adductor muscle during boiling was investigated through proteomic analysis, determination of water holding capacity (WHC) and oxidative indices, as well as observation with scanning electron microscopy and multiphoton nonlinear optical microscopy. The hardness and shear force showed the trend of first rising and then falling in 45 min-boiling time. The results suggested that short-time boiling caused the oxidation, denaturation and aggregation of proteins, resulting in the transverse contraction of myofibers and lateral cross-linked aggregation of muscle fibers and a rise in WHC, which led to the increase in hardness and shear force. While long-time boiling caused the progressive degradation of structural proteins such as fibrillin-1, collagen alpha-2(I) chain, myosin heavy chain, basement membrane-specific heparan sulfate proteoglycan core protein, and paramyosin, resulting in a loose myofibril network and the decrease in WHC, which led to the decrease in hardness and shear force.

Astaxanthin Promotes the Survival of Adipose-Derived Stem Cells by Alleviating Oxidative Stress via Activating the Nrf2 Signaling Pathway.

The survival of free fat grafts is dependent primarily on adipose-derived stem cells (ADSCs); however, ADSCs are susceptible to oxidative stress in the recipient area. Astaxanthin (Axt) is a natural xanthophyll carotenoid with potent antioxidant properties and numerous clinical applications. To date, the therapeutic potential of Axt in fat grafting has not been explored. The purpose of this study is to investigate the effects of Axt on oxidatively stressed ADSCs. An oxidative model of ADSCs was developed to simulate the host's microenvironment. Oxidative insult decreased the protein levels of Cyclin D1, type I collagen alpha 1 (COL1A1), and type II collagen alpha 1 (COL2A1), while increasing the expression of cleaved Caspase 3 and secretion of interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) in ADSCs. Axt pre-treatment significantly reduced oxidative stress, increased the synthesis of an adipose extracellular matrix, alleviated inflammation, and restored the impaired adipogenic potential in the present model. Furthermore, Axt immensely activated the NF-E2-related factor 2 (Nrf2) pathway, and ML385, an inhibitor of Nrf2, could negate Axt's protective effects. Additionally, Axt alleviated apoptosis by inhibiting bcl-2-associated X protein (BAX)/Caspase 3 signaling and improving the mitochondrial membrane potential (MMP), which could also be abolished by ML385. Our results suggest that Axt may exert its cytoprotective effect on ADSCs through the Nrf2 signaling pathway and could be therapeutic in fat grafting.

Hsa_circ_0072765 knockdown inhibits proliferation, activation and migration in transforming growth factor-beta (TGF-β)-induced hepatic stellate cells (HSCs) by the miR-197-3p/TRPV3 axis.

Circular RNAs (circRNAs) participate in the progression of diverse human diseases. However, the effects of circRNAs on liver fibrosis are limited. In this study, we aimed to investigate the functions of hsa_circ_0072765 in liver fibrosis. Transforming growth factor-beta (TGF-β)-treated hepatic stellate cells (HSCs) were used as the cell model of liver fibrosis. Quantitative real-time polymerase chain reaction (qRT-PCR) or western blot was performed to determine the expression of hsa_circ_0072765, microRNA-197-3p (miR-197-3p) and transient receptor potential cation channel subfamily V member 3 (TRPV3). 5'-ethynyl-2'-deoxyuridine (EdU) assay, flow cytometry analysis and wound-healing assay were conducted to evaluate cell proliferation, cell cycle and migration. HSC activation was assessed by determining the expression of alpha-smooth muscle actin (α-SMA) and type I collagen alpha 1 (Col1A1). Dual-luciferase reporter assay and RNA immunoprecipitation (RIP) were manipulated to analyze the relationship of hsa_circ_0072765, miR-197-3p and TRPV3. The exosome morphology was observed under transmission electron microscopy (TEM). Hsa_circ_0072765 level was increased in TGF-β-induced HSCs. Hsa_circ_0072765 knockdown inhibited cell proliferation, cell cycle, activation and migration in TGF-β-induced HSCs. Hsa_circ_0072765 sponged miR-197-3p and negatively regulated miR-197-3p expression. MiR-197-3p inhibition reversed the effects of hsa_circ_0072765 knockdown on TGF-β-induced HSC proliferation, cell cycle, activation and migration. In addition, TRPV3 was the target gene of miR-197-3p and miR-197-3p overexpression inhibited TGF-β-treated HSC proliferation, cell cycle, activation and migration by targeting TRPV3. Besides, we found that exosomal hsa_circ_0072765 was increased in TGF-β-treated HSCs. Hsa_circ_0072765 promoted the progression of TGF-β-treated HSCs by decoying miR-197-3p and upregulating TRPV3.

Silencing of UTX Mitigates Aging-Associated Cardiac Fibrosis via Blocking Cardiac Fibroblasts-to-Myofibroblasts Trans-Differentiation.

Cardiac fibrosis increases with age. Fibroblast activation plays an essential role in cardiac fibrosis. Histone modifications are involved in various chromatin-dependent processes. Attenuation of the histone H3 trimethylation on lysine 27 demethylase UTX by RNA interference or heterozygous mutation extends lifespan in worm. The objective of this study was to explore whether epigenetic silencing of UTX mitigates aging-associated cardiac fibrosis. Middle-aged mice (15 months old) were used and started to receive adeno-associated virus-scrambled-small hairpin RNA and adeno-associated virus-UTX-small hairpin RNA every 3 months from 15 months to 21 months, respectively. The mice were euthanized at 24 months of age (length of the study). Adeno-associated virus-UTX-small hairpin RNA delivery significantly attenu-ated aging-associated increase in blood pressure, especially in diastolic blood pressure, indicating silencing of UTX rescued aging-associated cardiac dysfunction. Aging-associated cardiac fibrosis is characterized by fibroblast activation and abundant extracellular matrix deposition, including collagen deposition and alpha smooth muscle actin activation. Silencing of UTX abolished collagen deposition and alpha smooth muscle actin activation, decreased serum transforming growth factor β, blocked cardiac fibro blast s-to- myofi brobl asts trans-differentiation by elevation of cardiac resident mature fibroblast markers, TCF21, and platelet-derived growth factor receptor alpha, which are important proteins for maintaining cardiac fibroblast physiological function. In the mechanistic study, adeno-associated virus-UTX-small hairpin RNA blocked transforming growth factor β-induced cardiac fibro blast s-to- myofi brobl asts trans-differentiation in isolated fibroblasts from 24-month-old mouse heart. The same results demonstrated as the in vivo study. Silencing of UTX attenuates aging-associated cardiac fibrosis via blocking cardiac fibroblasts-to-myofibroblasts transdifferentiation and consequently attenuates aging-associated cardiac dysfunction and cardiac fibrosis.

Profiling of Tumor Cell-Delivered Exosome by Surface Enhanced Raman Spectroscopy-Based Biosensor for Evaluation of Nasopharyngeal Cancer Radioresistance.

Although the advancement of radiotherapy significantly improves the survival of nasopharyngeal cancer (NPC), radioresistance associated with recurrence and poor outcomes still remains a daunting challenge in the clinical scenario. Currently, effective biomarkers and convenient detection methods for predicting radioresistance have not been well established. Here, the surface-enhanced Raman spectroscopy combined with proteomics is used to firstly profile the characteristic spectral patterns of exosomes secreted from self-established NPC radioresistance cells, and reveals specific variations of proteins expression during radioresistance formation, including collagen alpha-2 (I) chain (COL1A2) that is associated with a favorable prognosis in NPC and is negatively associated with DNA repair scores and DNA repair-related genes via bioinformatic analysis. Furthermore, deep learning model-based diagnostic model is generated to accurately identify the exosomes from radioresistance group. This work demonstrates the promising potential of exosomes as a novel biomarker for predicting the radioresistance and develops a rapid and sensitive liquid biopsy method that will provide a personalized and precise strategy for clinical NPC treatment.

The ROCK‐inhibitor ripasudil suppresses the expression of extracellular matrix proteins in Fuchs endothelial corneal dystrophy

AbstractPurpose: Fuchs endothelial corneal dystrophy (FECD) is characterized by a progressive loss of human corneal endothelial cells (HCEC) and excess deposition of extracellular matrix (ECM). As FECD pathophysiology involves Rho‐associated kinase (ROCK) signalling activation, we investigated the effect of various ROCK inhibitors on the expression of ECM proteins and proteolytic enzymes using ex vivo and in vitro models.Methods: Endothelial cell‐Descemet membrane lamellae (DM) from donor corneas (n = 20) and FECD patients (n = 100) undergoing Descemet membrane endothelial keratoplasty were used as ex vivo model. A human corneal endothelial cell line (HCEC‐12) served as in vitro model. Rho‐ROCK signalling pathway components and the effects of the ROCK inhibitors ripasudil (10/30 μM), Y‐27632 (10/30 μM), and netarsudil (1 μM) on the expression of ECM proteins and proteolytic enzymes were analysed, with or without addition of transforming growth factor β1 (TGFβ1, 5 ng/ml), using quantitative real‐time PCR and Western Blot analysis.Results: Constitutive expression of components of the Rho‐ROCK signalling pathway was higher in DM specimens from FECD patients compared to DM from normal donors. Stimulation with all three ROCK inhibitors significantly downregulated the expression of ECM genes, such as collagen 3 alpha 1 (COL3A1) and fibronectin 1 (FN1), in both FECD and normal DM as well as in HCEC‐12, compared to untreated controls, with ripasudil showing the most significant effect. Downregulation of COL1A1 and FN1 by ripasudil was verified on protein level as well. Ripasudil also suppressed the TGFβ‐induced expression and phosphorylation of downstream molecules of the TGFβ pathway (SMAD2) as well as of the Rho‐ROCK pathway (MLC2). Ripasudil further upregulated gene expression of proteolytic enzymes, e.g. matrix metalloproteinase 1 (MMP1) and MMP3.Conclusions: These findings suggest that inhibition of ROCK signalling in FECD patients may have a beneficial effect by suppressing expression and stimulating turnover of abnormal ECM components.

Abstract 14120: Proteomics of Diabetes-Related Heart Failure: The Atherosclerosis Risk in Communities (ARIC) Study

Introduction: Data on the pathophysiology of diabetes-related heart failure (HF) mainly stems for animal studies . There is a paucity of large-scale human studies on proteomic alterations that characterize diabetes-related HF. Hypothesis: Diabetes-related HF has unique proteomic markers. Method: We analyzed 4,955 plasma proteins using SomaLogic v4.0 on 10,189 ARIC Study participants (Visit 2, 1990-92, mean age: 57±7 years, 56% women, 22% Black adults, 14% with diabetes [n=1477]). We used Cox regression to assess proteins associated with diabetes-related HF, in a 2/3 discovery sample and then a 1/3 validation subset, using Bonferroni correction of P -values. Results: Over a median follow-up of 24 years, there were 2417 HF events overall (605 among individuals with diabetes). After adjustment for demographics, clinical, and metabolic and biological factors (Figure), 18 proteins were associated with HF specifically among individuals with diabetes in the discovery sample ( p&lt;10 -6 ), with 13 confirmed in the validation sample ( p&lt;0.05/18 ). The validated proteins included cartilage intermediate layer protein 2 and N-terminal pro-BNP, and collagen alpha-1(XV) chain, which are not unique to diabetes-related HF. Of the validated proteins, 11 were uniquely associated with HF among diabetic individuals, and included : myocilin, lymphocyte activation gene 3 protein, and collectin-11. The latter proteins were not associated with HF among individuals without diabetes. Conclusions: A large-scale proteomics approach identified unique proteomic markers of diabetes-related HF. Pathway analysis will shed additional light on the exact role of the novel proteins in the pathogenesis of diabetes-related HF.