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November 01, 1999; 53 (8) Expedited Publication

Astrocytes in multiple sclerosis lack beta-2 adrenergic receptors

Jacques De Keyser, Nadine Wilczak, Raymond Leta, Cerien Streetland
First published November 1, 1999, DOI: https://doi.org/10.1212/WNL.53.8.1628
Jacques De Keyser
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Nadine Wilczak
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Raymond Leta
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Cerien Streetland
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Citation
Astrocytes in multiple sclerosis lack beta-2 adrenergic receptors
Jacques De Keyser, Nadine Wilczak, Raymond Leta, Cerien Streetland
Neurology Nov 1999, 53 (8) 1628; DOI: 10.1212/WNL.53.8.1628

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Abstract

Background: In MS, T cells reactive to myelin proteins can cross the blood–brain barrier and release proinflammatory cytokines, such as interferon γ. These can induce glial cells to express class II major histocompatibility complex (MHC) molecules, which are required to present myelin antigens to the T cells in order to mount a proper autoimmune response. Both microglia and astrocytes can function as antigen-presenting cells. In contrast to microglia, endogenous suppressors, including norepinephrine, regulate astrocytic class II MHC expression. The effects of norepinephrine are mediated through activation of β2 adrenergic receptors.

Objective: To investigate β2 adrenergic receptors in astrocytes in MS.

Methods: Immunocytochemical techniques were applied in postmortem brain tissue from 10 patients with MS, three patients with a cerebral infarction, and six controls, and in spinal cord from three patients with ALS.

Results: β2 adrenergic receptors were visualized on astrocytes in white matter of controls, and they were prominently expressed in reactive astrocytes at the boundary of cerebral infarctions and in the lateral corticospinal tract in ALS. In MS, β2 adrenergic receptors could neither be visualized on astrocytes in normal-appearing white matter nor in reactive astrocytes in chronic active and inactive plaques, whereas they were normally present on neurons. MHC class II–positive astrocytes were only visualized in chronic active plaques.

Conclusions: Because astrocytic β2 adrenergic receptors are involved in suppressing inducibility of MHC class II molecules, we suggest that their lack of expression may play an important role in the induction or perpetuation of autoimmune reactions in MS.

  • Received July 28, 1999.
  • Accepted September 4, 1999.
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