# Huangkui capsule mitigates diabetic nephropathy via epigenetic therapy effects

## TL;DR

Huangkui capsule, a Chinese herbal medicine, helps treat diabetic nephropathy by altering DNA methylation and gene activity in the kidneys.

## Contribution

This study is the first to show that Huangkui capsule improves diabetic nephropathy through epigenetic mechanisms.

## Key findings

- HKC reduced urinary albumin/creatinine ratios, indicating kidney protection in diabetic mice.
- HKC modulated Tet2 expression, restoring abnormal DNA methylation patterns in DN.
- 12 genes linked to DN showed reversed methylation and expression after HKC treatment.

## Abstract

Huangkui capsule (HKC), a Chinese herbal medicine derived from Abelmoschus manihot (L.) ethanol extract, has clinical efficacy against diabetic nephropathy (DN). Our research group has actively engaged in exploring the efficacy of HKC in treating DN. The underlying pharmacological mechanisms have progressively become clearer but its epigenetic mechanisms remain unclear.

To elucidate HKC’s epigenetic role in the treatment of DN.

Db/db mice (a type 2 diabetes/DN model) were orally administered HKC or vehicle for 4 weeks. Kidney tissues underwent whole-genome bisulfite sequencing and transcriptome profiling to assess DNA methylation and gene expression patterns.

HKC significantly reduced urinary albumin/creatinine ratios, indicating renal protection. Comparative methylation analysis revealed HKC regulated the distribution of 5 mC by modulating Tet2 expression, thereby influencing abnormal methylation patterns in DN. Integrative analysis identified 12 DN-associated genes with reversed methylation and expression post-HKC treatment, including Cdk8, Pde4d, Pisd-ps3, and Zc3h7a, which showed high susceptibility to DN progression and HKC intervention. Functional annotation linked these genes to immune regulation, synaptic signaling, and Notch pathways.

This study provides the first evidence that HKC ameliorates DN through epigenetic therapy effects, specifically by restoring DNA methylation and transcriptional activity of renal target genes. Further biological experiments to validate these findings are necessary.