Expression
of α1- and β1-ARs. (A) Positive staining
for β1-ARs in undifferentiated cells, cells preinduced for 24
h with bFGF, EGF, and PDGF-AA, and cells after differentiation for
30 days. The scale bar is 100 μm. (B) Nuclear expression of
α1-ARs in undifferentiated cells, intensive nuclear staining
in cells preinduced for 24 h with bFGF, EGF, and PDGF-AA, and surface
expression after differentiation for 30 days. (C) Nuclear expression
of α1-ARs in undifferentiated cells and evidence of a significant
increase in staining intensity after treatment with bFGF alone for
24 h. Scale bars are 100 μm (40× magnification).