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Continuous exposure of DDT1 MF-2 smooth muscle cells to 10-100 μM norepinephrine results in a dramatic attenuation of the ability of norepinephrine to stimulate inositol phospholipid hydrolysis via α1-adrenergic receptors (α1-AR). In addition to the functional desensitization, norepinephrine exposure also reduces the number of accessible cell surface α1-AR as assayed by [3H]prazosin binding at 4°
