Related Experiment Video
Updated: Mar 20, 2026
Author Spotlight: Innovative Techniques for ROS Detection and Implications for Platelet Research
Published on: March 29, 2024
Inducing mitophagy in diabetic platelets protects against severe oxidative stress
Seung Hee Lee1, Jing Du1, Jeremiah Stitham1
1Section of Cardiovascular Medicine, Department of Internal Medicine, Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, CT, USA.
Abstract:
Diabetes mellitus (DM) is a growing international concern. Considerable mortality and morbidity associated with diabetes mellitus arise predominantly from thrombotic cardiovascular events. Oxidative stress-mediated mitochondrial damage contributes significantly to enhanced thrombosis in DM A basal autophagy process has recently been described as playing an important role in normal platelet activation. We now report a substantial mitophagy induction (above basal autophagy levels) in diabetic platelets, suggesting alternative roles for autophagy in platelet pathology. Using a combination of molecular, biochemical, and imaging studies on human DM platelets, we report that platelet mitophagy induction serves as a platelet protective mechanism that responds to oxidative stress through JNK activation. By removing damaged mitochondria (mitophagy), phosphorylated p53 is reduced, preventing progression to apoptosis, and preserving platelet function. The absence of mitophagy in DM platelets results in failure to protect against oxidative stress, leading to increased thrombosis. Surprisingly, this removal of damaged mitochondria does not require contributions from transcription, as platelets lack a nucleus. The considerable energy and resources expended in "prepackaging" the complex mitophagy machinery in a short-lived normal platelet support a critical role, in anticipation of exposure to oxidative stress.
Insights
Diabetic platelets activate mitophagy to remove damaged mitochondria, preventing cell death and preserving function. This protective mechanism combats oxidative stress and reduces thrombosis risk in diabetes mellitus.
Area of Science:
- Cardiovascular Research
- Metabolic Disorders
- Cellular Biology
Background:
- Diabetes mellitus (DM) is a global health issue with significant cardiovascular complications.
- Thrombosis is a major cause of morbidity and mortality in diabetic patients.
- Oxidative stress and mitochondrial damage are implicated in DM-associated thrombosis.
Purpose of the Study:
- To investigate the role of mitophagy in diabetic platelets.
- To elucidate the protective mechanisms against oxidative stress in platelets from individuals with DM.
- To understand the implications of mitophagy in platelet function and thrombosis.
Main Methods:
- Molecular, biochemical, and imaging studies on human diabetic platelets.
- Analysis of mitophagy induction and its relationship with oxidative stress.
- Investigation of the JNK activation pathway and its role in mitophagy.
- Assessment of p53 phosphorylation and apoptosis in relation to mitophagy.
Main Results:
- Diabetic platelets exhibit substantial mitophagy induction, a process beyond basal autophagy.
- Platelet mitophagy is activated via JNK signaling in response to oxidative stress.
- Mitophagy reduces phosphorylated p53, preventing platelet apoptosis and preserving function.
- Failure of mitophagy in diabetic platelets leads to increased oxidative stress and thrombosis.
Conclusions:
- Platelet mitophagy is a crucial protective mechanism against oxidative stress in diabetes mellitus.
- This process removes damaged mitochondria, preventing apoptosis and maintaining platelet function.
- Dysfunctional mitophagy contributes to the heightened thrombotic risk observed in diabetic patients.
- The nucleus-independent nature of platelet mitophagy highlights its critical, pre-programmed role.
More Related Videos
05:58Mouse Electroacupuncture Fixation Device Fabrication for Electroacupuncture Pretreatment in Diabetic Cardiomyopathy Mouse Model
Published on: April 18, 2025
07:40Protection of H9c2 Myocardial Cells from Oxidative Stress by Crocetin via PINK1/Parkin Pathway-Mediated Mitophagy
Published on: May 26, 2023
