Albumin evokes Ca2+-induced cell oxidative stress and apoptosis through TRPM2 channel in renal collecting duct cells reduced by curcumin

Yener Yazğan,László Pecze,Franziska Theilig,Mustafa Nazıroğlu,Bilal Çiğ,Gerburg K. Schwaerzer

doi:10.1038/s41598-019-48716-x

Yener Yazğan, László Pecze + Show 4 more

Open Access

https://doi.org/10.1038/s41598-019-48716-x

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Abstract

In proteinuric nephropathies of chronic kidney disease, the epithelial cells of the nephron including the collecting duct are exposed to high concentrations of luminal albumin. Albumin is taken up from collecting duct cells by endocytosis causing excessive reactive oxygen species (ROS) production and a proinflammatory response. Curcumin used in the traditional medicine possesses anti-inflammatory and antioxidant effects. ROS and ADP-ribose (ADPR) activate the cation channel TRPM2. We hypothesize, that albumin-induced cell stress and proinflammatory response are mediated by Ca2+ and can be reduced by curcumin. The cortical collecting duct (CCD) cells mpkCCDc14 exhibit spontaneous and inducible Ca2+ oscillations, which can be blocked by pre-treatment with curcumin. Curcumin accumulates in plasma membrane and intracellular vesicles, where it interferes with TRPM2 and decreases the influx of Ca2+. Albumin reduces cell viability and increases apoptosis, NF-κB activation, and mitochondrial membrane depolarization via Ca2+-dependent signaling, which results in increased ROS production. Albumin-induced cell stress is diminished by the inhibition of TRPM2 after administration of curcumin and ADPR (PARP1) inhibitors. Curcumin did not reduce the Ca2+ elevation induced by thapsigargin in Ca2+-free medium, but it reduced the function of store-operated Ca2+ channels and ATP-evoked Ca2+ response. In conclusion, albumin-induced oxidative stress is mediated by Ca2+-dependent signaling via TRPM2 and leads to cell damage and a proinflammatory response, strengthening the role of CCD cells in the progression of chronic kidney disease.

Highlights

Curcumin accumulates in plasma membrane and intracellular vesicles, where it interferes with TRPM2 and decreases the influx of Ca2+
We show that Ca2+ signaling is involved in albumin-induced oxidative stress, when calcium enters the cells via TRPM2 channels
We observed the TRPM2 activation up to 4.0 nA through intracellular ADPR treatment in the mpkCCDc14 cells after BSA treatment (Fig. 4C), the TRPM2 activation were diminished by extracellular anthranilic acid (ACA) treatment

Summary

Introduction

Curcumin accumulates in plasma membrane and intracellular vesicles, where it interferes with TRPM2 and decreases the influx of Ca2+. Albumin reduces cell viability and increases apoptosis, NF-κB activation, and mitochondrial membrane depolarization via Ca2+-dependent signaling, which results in increased ROS production. Albumin-induced cell stress is diminished by the inhibition of TRPM2 after administration of curcumin and ADPR (PARP1) inhibitors. Albumin-induced oxidative stress is mediated by Ca2+-dependent signaling via TRPM2 and leads to cell damage and a proinflammatory response, strengthening the role of CCD cells in the progression of chronic kidney disease. Albuminuria induces a proinflammatory response in CCDs promoting chronic kidney disease (CKD)[4]. Since pathophysiology of CKD involves oxidative stress and inflammation[10], the potential beneficial effect of curcumin consumption on the renal diseases have been extensively studied[7]. It is suggested that hydrogen peroxide triggers the intracellular production of ADP-ribose (ADPR) and activates TRPM215

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