Total Saponins from Rhizoma Panacis Majoris Promote Wound Healing in Diabetic Rats by Regulating Inflammatory Dysregulation

TL;DR

This study shows that saponins from Rhizoma Panacis Majoris help heal wounds in diabetic rats by reducing inflammation and promoting tissue repair.

Contribution

The study identifies the molecular mechanisms by which SRPM promotes diabetic wound healing through anti-inflammatory and tissue-regenerative effects.

Findings

SRPM reduces pro-inflammatory mediators like IL-1β, IL-6, and TNF-α in diabetic wound tissues.

SRPM increases anti-inflammatory cytokines such as IL-10 and TGF-β1, and promotes M2 macrophage polarization.

SRPM inhibits neutrophil infiltration and activates the Wnt/β-catenin signaling pathway.

Abstract

In individuals with diabetes, dysregulation of inflammatory processes hinders the progression of wounds into the proliferative phase, resulting in chronic, non-healing wounds. Total saponins from Rhizoma Panacis majoris (SRPM), bioactive compounds naturally extracted from the rhizome of Panax japonicus C.A.Mey. var. major (Burk.) C.Y.Wu and K.M.Feng, have demonstrated extensive anti-inflammatory and immunomodulatory properties. This study aims to elucidate the molecular mechanisms underlying the facilitative effects of SRPM on diabetic wound healing, with particular emphasis on its anti-inflammatory actions. A high-fat diet combined with streptozotocin (STZ) administration was used to induce type 2 diabetes in rats. After two weeks of oral treatment with SRPM suspension, a wound model was established. Subsequently, a two-week course of combined local and systemic therapy was administered using both SRPM suspension and SRPM gel. SRPM markedly reduces the levels of pro-inflammatory mediators, including IL-1α, IL-1β, IL-6, MIP-1α, TNF-α, and MCP-1, in both rat tissues and serum. Concurrently, it increases the expression of anti-inflammatory cytokines such as IL-10, TGF-β1, and PDGF-BB, while also enhancing the expression of the tissue remodelling marker bFGF. Additionally, SRPM significantly decreases the accumulation of apoptotic cells within tissues by downregulating the pro-apoptotic gene Caspase-3, upregulating the anti-apoptotic gene Bcl-2, and increasing the expression of the apoptotic cell clearance receptor MerTK. Moreover, SRPM inhibits neutrophil infiltration and the release of neutrophil extracellular traps (NETs) in tissues, promotes macrophage polarisation towards the M2 phenotype, and activates the Wnt/β-catenin signalling pathway at the molecular level. SRPM promotes the healing of wounds in diabetic rats potentially due to its anti-inflammatory properties.

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