A membrane abnormality in lymphocytes from diabetic subjects

Area of Science:

• Biophysics
• Cell Biology
• Clinical Biochemistry

Background:

• Diabetes mellitus is a metabolic disorder characterized by hyperglycemia.
• Cell membrane integrity and fluidity are crucial for cellular function.
• Alterations in cell membrane properties may contribute to diabetic complications.

Purpose of the Study:

• To investigate the fluorescence properties of a hydrophobic probe in lymphocytes from diabetic patients and healthy controls.
• To determine if diabetes affects lymphocyte membrane fluidity.
• To correlate probe polarization with plasma glucose levels.

Main Methods:

• Utilized the hydrophobic fluorescent probe 1,6-diphenyl-1,3,5-hexatriene (DPH).
• Measured probe polarization in lymphocytes isolated from 30 diabetic patients and 21 normal controls.
• Performed nanosecond fluorescence lifetime measurements on a subset of subjects.
• Correlated probe polarization with plasma glucose levels.

Main Results:

• Mean probe polarization was significantly lower in diabetic patients (0.294) compared to controls (0.314) (p < 0.001).
• Decreased polarization in patients correlated significantly with plasma glucose levels (p < 0.01).
• No significant differences in probe lifetimes were observed between groups.
• Results suggest increased lymphocyte membrane fluidity in diabetic patients.

Conclusions:

• Diabetes is associated with altered lymphocyte membrane fluidity, characterized by increased fluidity.
• The observed changes in membrane fluidity may be linked to hyperglycemia.
• Fluorescence polarization using DPH is a sensitive method to detect membrane alterations in diabetes.