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Adaptive immunity in mice lacking the beta(2)-adrenergic receptor
Virginia M Sanders1, Deborah J Kasprowicz, Michelle A Swanson-Mungerson
1Department of Cell Biology, Neurobiology and Anatomy, Loyola University Medical Center, Maywood, IL 60153, USA. sanders.302@osu.edu
Brain, Behavior, and Immunity
|March 5, 2003
Summary
Mice lacking the beta-2-adrenergic receptor (beta(2)AR) showed normal immune responses in vivo, suggesting compensatory mechanisms. However, beta(2)AR-deficient B cells failed to respond to norepinephrine in vitro.
Area of Science:
- Immunology
- Neuroendocrinology
- Adrenergic Signaling
Background:
- The beta-2-adrenergic receptor (beta(2)AR) is crucial for sympathetic nervous system modulation of immunity.
- Norepinephrine (NE) binding to beta(2)AR influences cell-mediated and humoral immune responses.
Purpose of the Study:
- To investigate the in vivo role of beta(2)AR in immune homeostasis.
- To determine if other adrenergic receptors compensate for beta(2)AR deficiency.
Main Methods:
- Comparison of immune parameters in beta(2)AR-deficient (beta(2)AR-/-) and wild-type (beta(2)AR+/+) mice.
- Analysis of lymphoid organ characteristics, contact sensitivity, and antibody responses.
- In vitro culture of B cells to assess norepinephrine responsiveness.
Main Results:
- No significant differences were observed in body/organ weights, lymphoid organ cellularity, histology, contact sensitivity, or T cell-dependent antibody responses between beta(2)AR-/- and beta(2)AR+/+ mice.
- Other adrenergic receptor subtypes did not compensate for the lack of beta(2)AR expression in vivo.
- Beta(2)AR-/- B cells exhibited impaired in vitro responses to NE.
Conclusions:
- Mice with lifelong beta(2)AR deficiency maintain immune homeostasis, indicating compensatory mechanisms in vivo.
- The in vitro B cell data suggest that compensatory pathways may be non-adrenergic or develop postnatally.