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Cell adhesion molecule expression in the regenerating rat facial nucleus
M E Moneta1, J Gehrmann, R Töpper
1Max-Planck-Institute of Psychiatry, Department of Neuromorphology, Martinsried, Germany.
Journal of Neuroimmunology
|June 1, 1993
Summary
Facial nerve injury in rats triggers microglial activation, marked by increased expression of leukocyte function-associated antigen-1 (LFA-1) on these immune cells. This upregulation suggests LFA-1 plays a role in microglial responses following nerve damage.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Facial nerve transection in rats induces a microglial reaction within the facial nucleus.
- Microglia, the resident immune cells of the central nervous system, respond dynamically to neuronal injury.
Purpose of the Study:
- To investigate the expression of cell adhesion molecules, specifically LFA-1 (leukocyte function-associated antigen-1) and ICAM-1 (intercellular adhesion molecule-1), during microglial activation following facial nerve injury.
- To determine the temporal profile of LFA-1 expression on activated microglia.
Main Methods:
- Immunocytochemistry was used to examine the expression of LFA-1 alpha and beta chains (CD11a and CD18) and ICAM-1 in the rat facial nucleus after facial nerve transection.
- Expression levels were analyzed at various time points post-axotomy.
Main Results:
- Resting microglia constitutively expressed LFA-1 in white matter, but not in the intact facial nucleus.
- Following facial nerve transection, activated microglia exhibited increased LFA-1 alpha and beta expression starting at 24 hours, peaking around day 7.
- ICAM-1 expression remained unchanged and was constitutively present on cerebral blood vessels.
Conclusions:
- Increased LFA-1 expression is a significant marker of microglial activation in response to facial nerve injury.
- LFA-1 may contribute to the cytoskeletal rearrangements of microglia during their activation process.