Treatment of rat hepatoma cells with insulin, glucagon, thyroxine (T4) and triiodothyronine (T3) caused a concentration-dependent decrease in the monomeric actin content as measured by the deoxyribonuclease-I inhibition assay. Similarly, human peripheral blood neutrophils responded with a decrease in monomeric actin content when stimulated with T4, T3 and the adrenergic agonists phenylephrine and isoprenaline. The effect of phenylephrine could be blocked by phentolamine, demonstrating the specificity of the interaction. These observations suggest that hormone-induced actin changes might be an important event in response to both cell-surface-reactive hormones, such as insulin, glucagon and adrenergic agents, and those hormones that act through intracellular receptors, such as thyroid hormones. It is suggested that changes in actin state may have a role in metabolic regulation and cell growth.

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