Sodium butyrate ameliorated diabetic nephropathy-associated tubulointerstitial inflammation by modulating the tight junctions of renal tubular epithelial cells

Citations Over Time

Abstract

As one of the most significant pathological changes of diabetic nephropathy (DN), tubulointerstitial fibrosis (TIF) had a close relationship with tubulointerstitial inflammation (TI), and the occurrence of TI could have resulted from the disrupted tight junctions (TJs) of renal tubular epithelial cells (RTECs). Studies have demonstrated that sodium butyrate (NaB), a typical short chain fatty acid (SCFA), played an important regulatory role in intestinal TJs and inflammation. In this study, our in vivo and in vitro results showed that accompanied by TI, renal tubular TJs were gradually disrupted in the process of DN-related TIF. In HG and LPS co-cultured HK-2 cells and db/db mice, NaB treatment regained the TJs of RTECs via the sphingosine 1-phosphate receptor-1 (S1PR1)/AMPK signaling pathway, relieving inflammation. Small interfering RNA of S1PR1, S1PR1 antagonist W146 and agonist SEW2871, and AMPK agonist AICAR were all used to further confirm the essential role of the S1PR1/AMPK signaling pathway in NaB's TJ protection in RTECs in vitro. Finally, NaB administration not only improved the renal function and TIF, but also relieved the TI of db/db mice. These findings suggested that the use of NaB might be a potential adjuvant treatment strategy for DN-associated TIF, and this protective effect was linked to the TJ modulation of RTECs via the S1PR1/AMPK signaling pathway, leading to the improvement of TI.

Related Papers

• → Tight junctions: from molecules to gastrointestinal diseases(2022)110 cited
• → Activation of AMP-activated protein kinase (AMPK) through inhibiting interaction with prohibitins(2023)9 cited
• → A novel AMPK activator, PT‐1, increases gamma1 AMPKassociated activity, but not gamma3 AMPK‐associated activity or glucose transport(2013)
• → THE PREVALENCE OF ACTIVATED-AMPK IN EARLY STAGE LUNG ADENOCARCINOMA(2008)
• → P2‐316: Disturbance in AMP‐activated protein kinase (AMPK) signaling pathway in Alzheimer's disease(2010)