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enhances
2-adrenergic receptor
expression in human airway epithelial cells by activating
PKC
Pulmonary Division, Department of Medicine, Temple University School of Medicine, Philadelphia, Pennsylvania 19140
Protein kinase
C (PKC)-activated signal transduction pathways regulate cell growth and
differentiation in many cell types. We have observed that interleukin
(IL)-1
upregulates
2-adrenergic receptor
(
2-AR) density and
2-AR mRNA in human
airway epithelial cells (e.g., BEAS-2B). We therefore tested the
hypothesis that PKC-activated pathways mediate IL-1
-induced
-AR
upregulation. The role of PKC was assessed from the effects of
1) the PKC activator phorbol 12-myristate 13-acetate (PMA)
on
-AR density, 2) selective PKC inhibitors (calphostin C
and Ro-31-8220) on
-AR density, and 3) IL-1
treatment
on the cellular distribution of PKC isozymes. Recombinant human IL-1
(0.2 nM for 18 h) increased
-AR density to 213% of control
values (P < 0.001). PMA (1 µM for 18 h) increased
-AR density to 225% of control values (P < 0.005),
whereas Ro-31-8220 and calphostin C inhibited the IL-1
-induced
upregulation of
-AR in dose-dependent fashion. PKC isozymes detected
by Western blotting included
,
II,
, µ,
, and
/
.
IL-1
increased PKC-µ immunoreactivity in the membrane fraction and
had no effect on the distribution of the other PKC isozymes identified.
These data indicate that IL-1
-induced
-AR upregulation is
mimicked by PKC activators and blocked by PKC inhibitors and appears to
involve selective activation of the PKC-µ isozyme. We conclude that
signal transduction pathways activated by PKC-µ upregulate
2-AR expression in human airway epithelial cells.
cytokines; gene expression; airway inflammation; signal
transduction; interleukin-1
; protein kinase C
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