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Alterations in plasma membrane lipid organization during lymphocyte differentiation
Journal of Cellular Physiology
|March 1, 1986
Summary
Immature lymphocytes have disordered plasma membranes, which become ordered upon maturation. Antigen activation causes lymphocyte membranes to become disordered again, impacting cell circulation.
Area of Science:
- Immunology
- Cell Biology
- Biophysics
Background:
- Lymphocyte plasma membrane organization is crucial for immune cell function.
- Lipid packing within the membrane influences cell behavior and circulation.
Purpose of the Study:
- To investigate changes in lymphocyte plasma membrane lipid organization during differentiation and activation.
- To explore the role of membrane lipid changes in lymphocyte circulation.
Main Methods:
- Utilized the fluorescent probe merocyanine 540, which binds to loosely packed lipid bilayers.
- Examined changes in dye binding in mouse thymocytes, peripheral blood lymphocytes (human and mouse), and splenic lymphocytes.
Main Results:
- Immature thymocytes showed high merocyanine 540 binding, indicating disordered membranes.
- Mature lymphocytes exhibited low binding, suggesting ordered membranes.
- Mitogenic stimulation of mature lymphocytes increased merocyanine 540 binding, indicating membrane disorder.
- Antigen-activated splenic lymphocytes showed high binding, which decreased upon culture but was restored by stimulation.
Conclusions:
- Lymphocyte differentiation involves dynamic changes in plasma membrane lipid organization, transitioning from disordered to ordered states and back upon activation.
- These membrane lipid alterations may regulate lymphocyte circulation and interactions with other cells.