Receptors involved in the nervous system regulation of polyamine metabolism in rat salivary glands


Department of Physiology and Biophysics, University of Lund, Sölvegatan 19, 223 62 Lund, Sweden


Polyamines are important for protein synthesis and tissue growth. In rat salivary glands, the activity of ornithine decarboxylase (ODC), the enzyme catalysing the formation of putrescine, and the content of putrescine, spermidine, spermine and N1-acetylspermidine were assayed after parasympathetic or sympathetic nerve stimulation in the presence of various autonomic receptor blockers. Increases in ODC activity occurred on activation of non-adrenergic and non-cholinergic receptors in response to parasympathetic nerve stimulation and on activation of α(α1)- as well as of β(β1)-adrenoceptors in response to sympathetic nerve stimulation. Moreover, in parotid glands, a β(β1)-adrenoceptor-mediated inverse pathway for putrescine formation seemed to exist: from spermidine via N1-acetylspermidine.