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International Urology and Nephrology

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20.05.2017 | Nephrology - Original Paper

Adrenomedullin ameliorates podocyte injury induced by puromycin aminonucleoside in vitro and in vivo through modulation of Rho GTPases

verfasst von: Nan Dong, Lixia Meng, Ruqun Xue, Meng Yu, Zhonghua Zhao, Xueguang Liu

Erschienen in: International Urology and Nephrology | Ausgabe 8/2017

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Abstract

Purpose

Podocyte injury is a key event in proteinuric kidney disease and eventually glomerular scarring. While adrenomedullin (AM), a potent vasodilatory peptide, has been reported to confer renoprotection in several experimental models of kidney diseases, its effect on injured podocytes and the related mechanism is still largely unknown.

Methods

Employing Western blotting analysis, immunoprecipitation and immunofluorescence, we investigated the effects of AM on the expressions of podocyte cytoskeletal proteins and Rho-family small GTPases (Rho GTPases) in puromycin aminonucleoside (PAN)-induced podocyte injury, both in cultured podocytes and in PAN nephrosis rats. Urinary protein excretion and the morphologic changes of kidney in PAN nephrosis rats were evaluated. Glutathione-S-transferase pull-down assay was applied for Rho GTPases activity.

Results

PAN induced massive albuminuria and morphologic injury, which were significantly mitigated by AM administration. AM significantly antagonized not only the PAN-decreased expressions of synaptopodin, nephrin, CD2AP and podocin, but also the PAN-disrupted interactions between synaptopodin–RhoA, nephrin–CD2AP, and CD2AP–Rac1–cortactin. These effects of AM in cultured podocytes were mostly significantly blocked by H89, a PKA inhibitor. AM dramatically upregulated the PAN-induced Rho GTPases protein expressions and their activities. PAN increased the expressions of endogenous AM and its receptor RAMP2 which was furthermore upregulated by AM administration.

Conclusions

AM alleviated podocyte injury induced by PAN both in cell culture and in PAN nephrosis. The beneficial effects of AM on podocytes can be attributable to direct modulation of podocyte cytoskeletal proteins and Rho GTPases, mainly via a PKA-dependent pathway.

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Titel: Adrenomedullin ameliorates podocyte injury induced by puromycin aminonucleoside in vitro and in vivo through modulation of Rho GTPases
verfasst von: Nan Dong
Lixia Meng
Ruqun Xue
Meng Yu
Zhonghua Zhao
Xueguang Liu
Publikationsdatum: 20.05.2017
Verlag: Springer Netherlands
Erschienen in: International Urology and Nephrology / Ausgabe 8/2017
Print ISSN: 0301-1623
Elektronische ISSN: 1573-2584
DOI: https://doi.org/10.1007/s11255-017-1622-y

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Adrenomedullin ameliorates podocyte injury induced by puromycin aminonucleoside in vitro and in vivo through modulation of Rho GTPases

Abstract

Purpose

Methods

Results

Conclusions

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