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Erythrocyte stiffness probed using atomic force microscope.

Malgorzata Lekka1, Maria Fornal, Grazyna Pyka-Fościak

  • 1The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland. Malgorzata.Lekka@ifj.edu.pl

Biorheology
|October 18, 2005
PubMed
Summary

Red blood cell stiffness, measured by Atomic Force Microscopy (AFM), increases in patients with diabetes mellitus and smokers. This cell stiffness also correlates with patient age, suggesting AFM as a potential diagnostic tool.

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Area of Science:

  • Biophysics
  • Cellular Biology
  • Medical Diagnostics

Background:

  • Erythrocyte (red blood cell) stiffness is a critical factor in hemorheology.
  • Changes in red blood cell mechanical properties are associated with various diseases.
  • Atomic Force Microscopy (AFM) offers high-resolution mechanical characterization of cells.

Purpose of the Study:

  • To quantify and compare the stiffness of erythrocytes in patients with specific disorders and healthy individuals.
  • To investigate the relationship between erythrocyte stiffness and conditions like diabetes mellitus, hypertension, and smoking.
  • To evaluate the potential of AFM as a diagnostic tool for assessing red blood cell health.

Main Methods:

  • Erythrocyte stiffness was measured using Atomic Force Microscopy (AFM).

Related Experiment Videos

  • Young's modulus (YM) distributions were determined for individual cells.
  • Samples were analyzed from patients (N=45) with coronary disease, hypertension, diabetes mellitus, and healthy controls (N=13).

    • Main Results:

    • Significantly increased average Young's modulus (YM) and YM distribution widths were observed in diabetes mellitus patients and smokers compared to healthy donors.
    • Erythrocyte YM increased with advancing patient age.
    • AFM demonstrated high sensitivity in detecting alterations in cell stiffness.

    Conclusions:

    • Erythrocyte stiffness is altered in patients with diabetes mellitus and in smokers.
    • AFM is a sensitive method for quantifying red blood cell stiffness.
    • AFM holds promise as a routine diagnostic tool for assessing red blood cell physiological and pathological states.