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Vol. 293, Issue 1, 1-7, April 2000
2-Adrenergic Receptors1
Department of Pharmacology, College of Medicine, University of
Nebraska Medical Center, Omaha, Nebraska
Mice with altered
2-adrenergic receptor genes have
become important tools in elucidating the subtype-specific functions of the three
2-adrenergic receptor subtypes because of the
lack of sufficiently subtype-selective pharmacological agents. Mice with a deletion (knockout) of the
2A-,
2B-, or
2C-gene as well as a point
mutation of the
2A-gene (
2A-D79N) and a
3-fold overexpression of the
2C-gene have been
generated. Studies with these mice indicate that most of the classical
functions mediated by the
2-adrenergic receptor, such as
hypotension, sedation, analgesia, hypothermia, and anesthetic-sparing
effect, are mediated primarily by the
2A-subtype. The
2B-subtype is the principal mediator of the hypertensive response to
2-agonists, appears to play a role in
salt-induced hypertension, and may be important in developmental
processes. The
2C-subtype appears to be involved in many
central nervous system processes such as the startle reflex, stress
response, and locomotion. Both the
2A- and
2C-subtypes are important in the presynaptic inhibition
of norepinephrine release and appear to have distinct regulatory roles.
The ability to study subtype-specific functions in different mouse
strains by altering the same
2-adrenergic receptor in
different ways strengthens the conclusions drawn from these studies.
Although these genetic approaches have limitations, they have
significantly increased our understanding of the functions of
2-adrenergic receptor subtypes.
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