Natural Compound Shields Pancreas Cells, Aiding Type 2 Diabetes

Jenn Hoskins
22nd June, 2025

Natural Compound Shields Pancreas Cells, Aiding Type 2 Diabetes

Treatment with Plantamajoside (PMS) alleviates key symptoms and pathology of type 2 diabetes in mice, improving physiological metrics like blood glucose control and insulin resistance (a–f) while also mitigating damage to pancreatic islet tissue (g).

Image adapted from: Zhao et al. / CC BY (Source)

Key Findings

  • Researchers in China and the US found that Plantamajoside (PMS) protected insulin-producing cells from damage in diabetic mice and lab-grown cells
  • PMS achieved this by activating a key cellular defense pathway (xCT/GPX4) that prevents ferroptosis, a harmful type of cell death in diabetes
  • This suggests that PMS, a natural plant compound, could be a promising new treatment to preserve vital pancreatic cells in Type 2 Diabetes
Type 2 Diabetes Mellitus, or T2DM, is a chronic condition where the body either doesn't produce enough insulin or doesn't use insulin effectively. A critical component of T2DM progression is the dysfunction and damage of pancreatic beta (β)-cells. These specialized cells, located in clusters called islets within the pancreas, are responsible for producing insulin, the hormone that regulates blood sugar. When β-cells are damaged or die, insulin production falters, leading to high blood sugar levels characteristic of T2DM. Recent research has highlighted a specific form of cell death called ferroptosis as a significant factor in pancreatic β-cell damage in T2DM. Ferroptosis is a unique type of cell death that relies on iron and involves the harmful accumulation of lipid peroxides, which are damaged fats in cell membranes. Understanding how to prevent or reduce ferroptosis in β-cells could offer new strategies for treating T2DM. Earlier studies have already begun to identify key genes involved in ferroptosis within dysfunctional islet β-cells in T2DM, with one study specifically pointing to MGST1 as a potential key gene[2]. This work established a direct link between ferroptosis and the decline of β-cell function in diabetes. Another area of interest is the therapeutic potential of natural compounds. Plantamajoside (PMS) is a compound derived from plants that has shown promise in combating diabetes-related complications. Previous research, for instance, demonstrated that PMS could alleviate kidney damage (diabetic nephropathy) by reducing oxidative stress and inflammation[3]. While that study didn't specifically investigate ferroptosis, its findings on PMS's ability to counter oxidative stress are relevant, as oxidative stress is a core component of ferroptosis. Furthermore, even common T2DM medications like Metformin have been shown to protect β-cells by modulating ferroptosis, specifically through pathways involving GPX4[4]. This suggests that targeting ferroptosis is a viable strategy for β-cell protection. Building on these insights, a recent study conducted by researchers from Cangzhou Hospital of Integrated TCM & Western Med., Yunnan University of Chinese Medicine, and the University of Pennsylvania investigated whether Plantamajoside (PMS) could protect pancreatic β-cells by inhibiting ferroptosis[1]. The study aimed to uncover the specific mechanisms by which PMS exerts its protective effects, focusing on a crucial cellular pathway known as the cysteine/glutamate transporter (xCT)/glutathione peroxidase 4 (GPX4) pathway. This pathway is vital for protecting cells from oxidative damage and preventing ferroptosis. The xCT protein helps bring in components needed to make glutathione, a powerful antioxidant, and GPX4 is an enzyme that neutralizes harmful lipid peroxides, thus preventing ferroptosis. To determine PMS's effects, the researchers conducted both in vivo (in living organisms) and in vitro (in laboratory cultures) experiments. For the in vivo part, diabetic mice were given PMS, and their pancreatic tissue damage, levels of ferroptosis, and the activity of the xCT/GPX4 pathway were assessed. In the in vitro experiments, pancreatic β-cells were exposed to high glucose and palmitic acid, conditions known to induce damage and mimic the diabetic environment. The researchers then observed how PMS affected cell damage, ferroptosis levels, and the xCT/GPX4 pathway in these cells. To validate PMS's specific action on ferroptosis, the study used control substances. Ferrostatin-1 (Fer-1), a well-known inhibitor of ferroptosis, was used as a positive control to compare PMS's effectiveness. Additionally, RSL-3, an inhibitor of GPX4, was used to confirm that PMS's protective effects were indeed mediated through the xCT/GPX4 axis. If RSL-3 reversed PMS's benefits, it would strongly suggest that GPX4 activation is a key part of PMS's mechanism. The findings were significant. In diabetic mice, PMS effectively reduced pancreatic tissue damage and decreased signs of ferroptosis. Crucially, it also boosted the expression of factors associated with the protective xCT/GPX4 pathway. Similarly, in the lab-cultured β-cells, PMS alleviated damage induced by high glucose and palmitic acid, suppressed ferroptosis, and upregulated components of the xCT/GPX4 pathway. The effects of PMS were comparable to those of Fer-1, the established ferroptosis inhibitor, further supporting its role in preventing this type of cell death. Conversely, when RSL-3 was introduced, it diminished PMS's protective effects on β-cell damage, its ability to inhibit ferroptosis, and its activation of the xCT/GPX4 pathway. This provided strong evidence that PMS acts by enhancing this specific protective pathway. These results expand upon the understanding that ferroptosis is a critical factor in β-cell damage in T2DM, as previously indicated[2]. The study also provides new insights into how Plantamajoside, a compound with known anti-diabetic properties[3], can specifically protect β-cells by directly inhibiting ferroptosis. This mechanism, involving the xCT/GPX4 pathway, aligns with and complements findings from other studies showing that targeting GPX4 is a viable strategy for β-cell protection, as seen with Metformin[4]. By demonstrating PMS's capacity to reduce T2DM-induced damage to pancreatic islet β-cells both in living organisms and in cell cultures, the study suggests that PMS could be a promising therapeutic agent. Its beneficial effects appear to stem from alleviating lipid peroxidation and reducing ferroptosis, achieved through the enhancement of the xCT/GPX4 axis. This research opens new avenues for developing treatments that specifically target ferroptosis to preserve β-cell function in individuals with T2DM.

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References

Main Study

1) Mechanism of Plantamajoside in inhibiting ferroptosis of pancreatic β cells and treatment of T2DM via activation of the xCT/GPX4 pathway

Published 20th June, 2025

https://doi.org/10.1371/journal.pone.0325674

Related Studies

2) Bioinformatics Analysis Identifies Potential Ferroptosis Key Gene in Type 2 Diabetic Islet Dysfunction.

https://doi.org/10.3389/fendo.2022.904312

3) Plantamajoside inhibits high glucose-induced oxidative stress, inflammation, and extracellular matrix accumulation in rat glomerular mesangial cells through the inactivation of Akt/NF-κB pathway.

https://doi.org/10.1080/10799893.2020.1784939

4) Protective effects of metformin on pancreatic β-cell ferroptosis in type 2 diabetes in vivo.

https://doi.org/10.1016/j.biopha.2023.115835


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