Techniques to evaluate erythrocyte deformability in diabetes mellitus

Area of Science:

• Biomedical Engineering
• Hematology
• Rheology

Background:

• Diabetes mellitus is a metabolic disorder associated with microvascular complications.
• Erythrocyte deformability is a critical factor in microcirculation and tissue oxygenation.
• Altered erythrocyte rheology may contribute to diabetic complications.

Purpose of the Study:

• To investigate erythrocyte deformability in patients with type 1 and type 2 diabetes using various rheological techniques.
• To assess the impact of diabetes on both whole blood and isolated erythrocyte rheological properties.
• To explore changes in red blood cell membrane dynamics in diabetic subjects.

Main Methods:

• Macrorheological methods: whole-blood filtration, erythrocyte suspension filtration, polyviscosimetry, and diffractometry.
• Microrheological methods: fluorescence spectroscopy to assess membrane fluidity and protein lateral mobility.
• Evaluation of erythrocyte deformability under different shear stress and hematocrit conditions.

Main Results:

• Whole-blood filterability was reduced in type 2 diabetics at higher negative pressure.
• Polyviscosimetry indicated impaired erythrocyte filterability at high hematocrit in type 2 diabetics.
• Diffractometry revealed altered erythrocyte elongation in type 1 diabetics.
• Fluorescence spectroscopy showed reduced erythrocyte membrane fluidity and protein lateral mobility in diabetic subjects.

Conclusions:

• Erythrocyte deformability is significantly altered in diabetic patients, with distinct changes observed in type 1 and type 2 diabetes.
• Red blood cell membrane properties, including fluidity and protein mobility, are compromised by diabetes.
• These rheological alterations may play a role in the pathogenesis of diabetic microvascular complications.