Protective Role of Growth Hormone Against Hyperhomocysteinemia-induced Glomerular Injury

Overview

Journal Naunyn Schmiedebergs Arch Pharmacol

Specialty Pharmacology

Date 2013 Mar 27

PMID 23529346

Citations 7

Authors

Caixia Li

Min Xia

Justine M Abais

Xiaocheng Liu

Ningjun Li

Krishna M Boini

Pin-Lan Li

Affiliations

Soon will be listed here.

Abstract

The present study investigated the protective role of growth hormone (GH) against hyperhomocysteinemia (hHcys)-induced activations of reactive oxygen species/hypoxia-inducible factor (HIF)-1α, epithelial-mesenchymal transition (EMT), and consequent glomerular injury. A hHcys model was induced by folate free diet in mice. The urine protein excretion significantly increased while plasma GH levels dramatically decreased in hHcys. Real-time reverse transcription polymerase chain reaction showed that GH receptor (GHR) level increased in the cortex of hHcys mice, which mainly occurred in podocytes as shown by confocal microscopy. Recombinant mouse growth hormone (rmGH) treatment (0.02 mg/kg, once a day for 6 weeks) significantly restored the plasma GH, inhibited GHR upregulation and attenuated proteinuria. Correspondingly, rmGH treatment also blocked hHcys-induced decrease in the expression of podocin, a podocyte slit diaphragm molecule, and inhibited the increases in the expression of desmin, a podocyte injury marker. It was also demonstrated that in hHcys the expression of epithelial markers, p-cadherin and ZO-1, decreased, while the expression of mesenchymal markers, antifibroblast-specific protein 1 (FSP-1) and α-SMA, increased in podocytes, which together suggest the activation of EMT in podocytes. Nicotinamide adenine dinucleotide phosphate oxidase (Nox)-dependent superoxide anion (O2 (.-)) and hypoxia-inducible factor-1α (HIF-1α) level in the hHcys mice cortex was markedly enhanced. These hHcys-induced EMT enhancement and Nox-dependent O2 (.-)/HIF-1α activation were significantly attenuated by rmGH treatment. HIF-1α level increased in Hcys-treated cultured podocytes, which were blocked by rmGH treatment. Meanwhile, homocysteine (Hcys)-induced EMT in cultured podocytes was significantly reversed by HIF-1α siRNA. All these results support the view that GH ameliorates hHcys-induced glomerular injury by reducing Nox-dependent O2 (.-)/HIF-1α signal pathway and EMT.

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