Related Experiment Video
Updated: Feb 8, 2026
Exploring the Two Herb Combination Strategy to Treat Injured PC12 Cells
Published on: November 18, 2022
[Effects of exendin-4 on methylglyoxal-induced oxidative stress in PC12 cells]
Qing Zhou1, Yan-Ping Wang2,3, Xiao-Ying Liu1
1Fujian Institute of Endocrinology, Fuzhou 350001, China.
Objective:
To study whether Exendin-4(Ex-4) could influence oxidative stress in PC12 cells induced by methylglyoxal and its underlying mechanism.
Methods:
PC12 cells were cultured with methylglyoxal (0,0.25,0.50,0.75,1.0,2.0 mmol/L) for 12~48 h, or PC12 cells were pretreated with Ex-4 (25, 50, 100, 200 nmol/L) for 24 h then incubatedwith methylglyoxal (0.75 mmol/L) for 24 h. MTT assay was used to measure cell viability. Fluorescent probe method was used to detect reactive oxygen species (ROS) expression. Xanthine oxidase method was used to detect superoxide dismutase (SOD)activity. With pretreatment of Exendin-4 (100 nmol/L) for 24 h,the expressions ofP-IκBα, Inhibitor of NF-κB-α IκBα were detected by Western blot after PC12 cells were exposed to methylglyoxal (0.75 mmol/L) for 1 h.
Results:
Following methylglyoxal administration, cell viability was gradually decreased in a dose-and time-dependent manner. Pretreatment with Ex-4 for 24 hours, cellviability were gradually increased compared with methylglyoxal-alone group. Pretreatment with Ex-4 (100 nmol/L) for 24 hours, ROS expression was reduced by65.30% (P<0.01) compared with methylglyoxal-alone group, ROS expression in NAC-pretreatment group was reduced by 107.40% (P<0.01); SOD activity in the Ex-4 pretreatment group was increased by 5.30 U/mg prot (P<0.01), SOD activity in the NAC pretreatment group was increased by 8.53 U/mg prot (P<0.01);the ratio of P-IκB-α/IκB-α in the Ex-4 pretreatment group was reduced by 25.50% (P<0.01), the ratio of P-IκB-α/IκB-α in the NAC pretreatment group was reduced by 35.14% (P<0.01).
Conclusions:
This study demonstrates that Ex-4 can increase the viabilities of PC12 cells and protect PC12 cells from oxidative stress induced by methylglyoxal, the mechanism may involve in suppressing the activation of protein IκB-α.
Insights
Exendin-4 (Ex-4) protects PC12 cells from methylglyoxal-induced oxidative stress by increasing cell viability and reducing reactive oxygen species (ROS). The mechanism involves suppressing the activation of Inhibitor of NF-κB-α (IκB-α).
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Methylglyoxal (MGO) is a reactive dicarbonyl compound implicated in oxidative stress and cellular damage.
- PC12 cells are a neuronal cell line commonly used to model neurotoxicity and study neuroprotective agents.
- Oxidative stress plays a critical role in the pathogenesis of various neurodegenerative diseases.
Purpose of the Study:
- To investigate the protective effects of Exendin-4 (Ex-4) against methylglyoxal (MGO)-induced oxidative stress in PC12 cells.
- To elucidate the underlying molecular mechanisms by which Ex-4 exerts its protective effects, focusing on the NF-κB signaling pathway.
Main Methods:
- PC12 cells were exposed to varying concentrations and durations of MGO, with or without Ex-4 pretreatment.
- Cell viability was assessed using MTT assays.
- Reactive oxygen species (ROS) generation was measured using a fluorescent probe.
- Superoxide dismutase (SOD) activity was determined using the xanthine oxidase method.
- Western blotting was employed to analyze the expression levels of phosphorylated IκB-α (P-IκB-α) and total IκB-α.
Main Results:
- MGO exposure decreased PC12 cell viability in a dose- and time-dependent manner.
- Ex-4 pretreatment significantly increased cell viability compared to MGO-alone treatment.
- Ex-4 pretreatment reduced ROS generation and enhanced SOD activity.
- Ex-4 pretreatment suppressed the MGO-induced increase in the P-IκB-α/IκB-α ratio, indicating inhibition of NF-κB activation.
Conclusions:
- Exendin-4 demonstrates significant neuroprotective effects against methylglyoxal-induced oxidative stress in PC12 cells.
- Ex-4 enhances cell viability and mitigates oxidative damage by reducing ROS and boosting antioxidant defenses.
- The protective mechanism of Ex-4 appears to involve the suppression of NF-κB pathway activation via inhibition of IκB-α degradation.
Related Concept Videos
03:14Oxidation Numbers
01:15Pyruvate Oxidation
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
01:13Induced Pluripotent Stem Cells
03:11Oxidation-Reduction Reactions
02:02Responses to Salt Stress
02:45Responses to Heat and Cold Stress