It has previously been reported that aortic smooth muscle cells cultured from old rats have a marked decline in beta-adrenergic stimulated cAMP accumulation. We wished to confirm this observation and determine whether this decline was secondary to loss of beta-adrenergic receptors (BAR). Primary cultures of aortic and mesenteric artery smooth muscle cells were obtained by enzymatic digestion from young and old male Fischer 344 rats. In aortic cells from old animals, there was a decline in beta-adrenergic receptor density and a rightward shift in the dose response curve to isoproterenol without a change in maximal cAMP accumulation. In mesenteric artery cells, there were no age changes in these parameters. Beta-adrenergic receptor subtype distribution was determined and was similar between all age groups and vessel types. These findings differ from whole tissue studies and suggest that cultured smooth muscle cells have limitations as a model for the aging adrenergic system.
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