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Updated: Feb 2, 2026

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
Published on: November 29, 2024
Phosphatidylserine expressing microvesicles in relation to microvascular complications in type 1 diabetes
Karin Bergen1, Fariborz Mobarrez2, Gun Jörneskog3
1Karolinska Institutet, Department of Clinical Sciences, Danderyd University Hospital, Division of Nephrology, Stockholm, Sweden.
Introduction:
Type 1 diabetes is a prothrombotic state strongly linked to vascular complications. The role of microvesicles (MVs) as mediators and potential biomarkers in microangiopathy in type 1 diabetes remains unclear.
Materials And Methods:
MV levels in plasma samples from 106 patients with type 1 diabetes with microangiopathy, 130 patients without microangiopathy and 100 healthy controls were analysed using flow cytometry. Phosphatidylserine (PS) expression in MVs was assessed by lactadherin, and the ability of MVs to induce thrombin generation was investigated in vitro. Endogenous plasma lactadherin levels were measured using ELISA.
Results:
Patients with type 1 diabetes had higher MV levels compared to healthy controls, with no significant differences between patients with and without microangiopathy. MV-induced thrombin generation in normal-pooled plasma was blocked by addition of lactadherin. Endogenous lactadherin levels were higher in patients compared to controls, and the highest levels were found in patients with microangiopathy. Plasma lactadherin levels did not correlate with levels of PS positive/negative MVs.
Conclusion:
Patients with type 1 diabetes with and without microangiopathy have higher levels of circulating MVs than healthy controls, probably reflecting higher cellular activation and turnover. However, we found no associations between clinical microangiopathy and levels of MVs in total or PS-expressing MVs. Plasma levels of lactadherin, which is a glycoprotein important in the clearance of cells and MVs, are increased in patients with type 1 diabetes and correlate with microangiopathy.
Insights
Patients with type 1 diabetes show increased microvesicles (MVs) and lactadherin, a clearance glycoprotein. While MVs are elevated, lactadherin levels correlate with microangiopathy, suggesting its role in vascular complications.
Area of Science:
- Endocrinology
- Vascular Biology
- Hematology
Background:
- Type 1 diabetes is a prothrombotic condition associated with vascular complications.
- The specific role of microvesicles (MVs) in type 1 diabetes-related microangiopathy is not fully understood.
Purpose of the Study:
- To investigate microvesicle (MV) levels and their association with microangiopathy in type 1 diabetes.
- To explore the role of lactadherin in type 1 diabetes and its potential link to microangiopathy.
Main Methods:
- Flow cytometry was used to analyze MV levels in plasma from type 1 diabetes patients and healthy controls.
- Phosphatidylserine (PS) expression on MVs and their thrombin generation capacity were assessed.
- ELISA was employed to measure endogenous plasma lactadherin levels.
Main Results:
- Patients with type 1 diabetes exhibited higher circulating MV levels than controls, irrespective of microangiopathy status.
- MV-induced thrombin generation was inhibited by lactadherin.
- Plasma lactadherin levels were elevated in type 1 diabetes patients, particularly those with microangiopathy, but did not correlate with PS-positive MVs.
Conclusions:
- Elevated MV levels in type 1 diabetes suggest increased cellular activation, but do not directly correlate with clinical microangiopathy.
- Increased plasma lactadherin levels in type 1 diabetes patients correlate with microangiopathy, indicating its potential involvement in the condition's vascular complications.
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