gammaENaC/CD9 in urinary extracellular vesicles as a potential biomarker of MR activity


Posted: 2021-11-10 20:00:00
Primary aldosteronism (PA) is caused by autonomous overproduction of aldosterone, which induces organ damage directly via activation of the mineralocorticoid receptor (MR); however, no specific or sensitive biomarkers are able to reflect MR activity. Recently, it is found that urinary extracellular vesicles (uEVs) are secreted by multiple cell types in the kidney and are an enriched source of kidney-specific proteins. Here, we evaluate sodium transporters in uEVs as candidates of biomarkers of MR activity in the clinical setting. Sixteen patients were examined to determine their plasma aldosterone concentration (PAC) and renin activity, and their morning urine was collected. The protein levels of two sodium transporters in uEVs, γ-epithelial sodium channel (γENaC) and thiazide-sensitive sodium chloride cotransporter (NCC), were quantified by Western blot analysis, and their clinical correlation with PAC was determined. Consequently, we found PAC was significantly correlated with the γENaC protein level adjusted by the CD9 protein level in uEVs (correlation coefficient = 0.71). PAC was also correlated with the NCC protein level adjusted by the CD9 protein level in uEVs (correlation coefficient = 0.61). In two PA patients, treatment with an MR antagonist or adrenalectomy reduced γENaC/CD9 in uEVs. In conclusion, γENaC/CD9 in uEVs is a valuable biomarker of MR activity in PA patients and may be a useful biomarker for other MR-associated diseases.

参考サイト PubMed: exsome



バイオクイックニュース日本語版:エクソソーム特集

バイオクイックニュース日本語版
12月 04, 2018 バイオアソシエイツ

鼻から侵入する細菌から気道を保護する仕組みが解明される。エクソソーム群は強力な抗菌化合物を作るため武装する。

細菌は、私たちが呼吸するあらゆる空気の中に存在する。気道がこれらの細菌の感染からどのように保護されるのか、今まで謎のままだった。細菌を吸入すると、細菌を直接攻撃する細胞から直ちに エクソソーム が分泌され、鼻の前部から気道に沿って抗菌タンパク質を送り、細菌が体の奥に入る前に防御する。 マサチューセッツEye and Earの研究チームは、2018年11月12日にJournal of Allergy and Clinical…

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