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- and
-adrenoceptors
1 Department of Anatomy and
Neurobiology,
We have studied the adrenergic mechanisms of
immediate-early gene (IEG) induction in the discrete types of cardiac
cells with the use of in situ hybridization histochemistry in an
immobilization-stress model in conscious rats. Expression of
c-fos,
fos B,
c-jun, jun B, NGFI-A, and
NGFI-B mRNA was rapidly upregulated in the endothelial, myocardial, and
smooth muscle cells of coronary vessels by 15-45 min after the
onset of immobilization. Simultaneous blockade of both
- and
-adrenoceptors completely abolished expression of IEGs in these
cardiac cells. Application of an
-agonist or
-agonist alone to
the perfused rat heart under constant pressure elicited the
upregulation of IEGs in a fashion similar to that of emotional stress.
These data suggest that activation of either
- or
-adrenoceptor is sufficient to evoke expression of these genes and that there may be
cross talk in signal transduction downstream from
- and
-adrenoceptors in cardiac cells.
catecholamine; endothelial cells; cardiac myocytes; coronary artery; immobilization stress
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