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Claudin-7 in keratinocytes is downregulated by the inhibition of HMG-CoA reductase and is highly expressed in the stratum granulosum of the psoriatic epidermis

ABSTRACT: Claudin-7 in keratinocytes is downregulated by the inhibition of HMG-CoA reductase and is highly expressed in the stratum granulosum of the psoriatic epidermis

PROVIDER: PRJNA748092 | ENA |

REPOSITORIES: ENA

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Claudin-7 in keratinocytes is downregulated by the inhibition of HMG-CoA reductase and is highly expressed in the stratum granulosum of the psoriatic epidermis

Project description:Background: Cholesterol is de novo synthesized in the upper epidermis and plays an important role in maintaining the normality of skin. Studying the impact of the inhibition of cholesterol de novo synthesis in the epidermis may help understand how skin homeostasis is regulated. Objective: In this study, we created a gene expression profile to investigate the effect of hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors on epidermal homeostasis. Methods: A microarray analysis was performed using normal keratinocytes with or without HMG-CoA reductase inhibitor (pitavastatin) treatment. Real-time PCR confirmed the reproducibility of genes with altered expression in keratinocytes treated with HMG-CoA reductase inhibitors. Among these genes, we focused on reduced expression of claudin 7 histologically confirmed by immunohistochemical staining, in situ hybridization, and immunoelectron microscopy. Results: Claudin-7 was highly expressed in the stratum granulosum of psoriatic lesions but was not expressed in the normal epidermis. Immunoelectron microscopy revealed that claudin-7 was localized in the keratohyalin granules of psoriatic lesions. Conclusion: These results indicate that claudin-7 expression was regulated by HMG-CoA reductase in the epidermis and might play a pathogenic role in the keratohyalin granules found in the epidermal granular layer of psoriasis.

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Project description:The tight junction (TJ) proteins claudin-2 and -10a form paracellular cation and anion channels, respectively, and have both been reported to be expressed in the proximal tubule (PT). However, the physiological role of claudin-10a in the kidney is yet obscure. Mice deficient in claudin-10a were generated and successful knockout was confirmed by Southern Blot, Western Blot and immunofluorescence staining. The functionality of isolated PTs was investigated electrophysiologically. Compensatory regulation was studied by pharmacological intervention, RNA-Seq analysis, Western Blot and immunofluorescence staining.

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