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Identification of an Altered Matrix Signature in Kidney Aging and Disease.

ABSTRACT: Background: Accumulation of extracellular matrix in organs and tissues is a feature of both aging and disease. In the kidney, glomerulosclerosis and tubulointerstitial fibrosis accompany the decline in function, which current therapies cannot address, leading to organ failure. Whilst histological and ultrastructural patterns of excess matrix form the basis of human disease classifications, comprehensive molecular resolution of abnormal matrix is lacking. Methods: Using mass spectrometry-based proteomics we resolved matrix composition over age in mouse models of kidney disease. We compared the changes in mice with a global characterization of human kidney matrix during aging and to existing kidney disease datasets to identify common molecular features. Results: Ultrastructural changes in basement membranes are associated with altered cell adhesion and metabolic processes and with distinct matrix proteomes during aging and kidney disease progression in mice. Within the altered matrix, basement membrane components (laminins, type IV collagen, type XVIII collagen) were reduced and interstitial matrix proteins (collagens I, III, VI, XV, fibrinogens and nephronectin) were increased, a pattern also seen in human kidney aging. Indeed, this signature of matrix proteins was consistently modulated across all age and disease comparisons and the increase in interstitial matrix was also observed in human kidney disease datasets. Conclusions: This study provides deep molecular resolution of matrix accumulation in kidney aging and disease and identifies a common signature of proteins that provides insight into mechanisms of response to kidney injury and repair.

SUBMITTER: Randles M

PROVIDER: S-EPMC8425653 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Background: Aging is a strong risk factor and an independent prognostic factor in idiopathic pulmonary fibrosis (IPF). In this study, we aimed to conduct a comprehensive analysis based on gene expression profiles for the role of aging in pulmonary fibrosis. Method: Four datasets (GSE21411, GSE24206, GSE47460, and GSE101286) for patients with clinical IPF and one dataset for bleomycin (BLM)-induced pulmonary fibrosis (BIPF) mouse model (GSE123293) were obtained from Gene Expression Omnibus (GEO). According to different age ranges, both patients with IPF and BIPF mice were divided into young and aged groups. The differently expressed genes (DEGs) were systemically analyzed using Gene Ontology (GO) functional, Kyoto Encyclopedia of Genes and Genomes (KEGG), and hub genes analysis. Finally, we verified the role of age and core genes associated with age in vivo. Results: Via the expression profile comparisons of aged and young patients with IPF, we identified 108 aging-associated DEGs, with 21 upregulated and 87 downregulated. The DEGs were associated with "response to glucocorticoid," "response to corticosteroid," and "rhythmic process" in GO biological process (BP). For KEGG analysis, the top three significantly enriched KEGG pathways of the DEGs included "IL-17 signaling pathway," "Mineral absorption," and "HIF-1-signaling pathway." Through the comparisons of aged and young BIPF mice, a total number of 778 aging-associated DEGs were identified, with 453 genes increased and 325 genes decreased. For GO and KEGG analysis, the DEGs were enriched in extracellular matrix (ECM) and collagen metabolism. The common DEGs of patients with IPF and BIPF mice were enriched in the BP category, including "induction of bacterial agglutination," "hyaluronan biosynthetic process," and "positive regulation of heterotypic cell-cell adhesion." We confirmed that aged BIPF mice developed more serious pulmonary fibrosis. Finally, the four aging-associated core genes (Slc2a3, Fga, Hp, and Thbs1) were verified in vivo. Conclusion: This study provides new insights into the impact of aging on pulmonary fibrosis. We also identified four aging-associated core genes (Slc2a3, Fga, Hp, and Thbs1) related to the development of pulmonary fibrosis.

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Identification of an Altered Matrix Signature in Kidney Aging and Disease.

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