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Adrenergic innervation of pancreatic islets and modulation of insulin secretion by the sympatho-adrenal system

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Summary

Morphological changes in the adrenergic innervation of pancreatic islets after chemical sympathectomy by use of 6-hydroxydopamine and the influence of the sympatho-adrenal system on insulin secretion were investigated in the mouse and rat.

Fluorescence histochemistry revealed a clear-cut reduction in the number of adrenergic nerve fibers in the pancreatic islets 2 days after administration of 6-hydroxydopamine; the reduction was more pronounced in the rat than in the mouse. In the rat, a partial regeneration was seen after 6 weeks. In the pancreas of the mouse, after administration of 6-hydroxydopamine, a severe damage of unmyelinated nerve fibers was revealed electron microscopically. However, no ultrastructural or immunohistochemical alterations could be demonstrated in the endocrine cells of the islets.

6-Hydroxydopamine induced a depression of basal plasma insulin concentrations in mice and an elevation in rats. Adrenalectomy depressed basal plasma insulin levels in mice.

The α-adrenoceptor antagonist phentolamine enhanced insulin secretion in normal mice. The secretory response of insulin to phentolamine was diminished by chemical sympathectomy and almost abolished by adrenalectomy or the combination of chemical sympathectomy and adrenalectomy. Thus, the effect of phentolamine is probably mediated by liberated catecholamines.

It is concluded that basal insulin secretion is partially regulated by the sympatho-adrenal system and that species differences exist in this respect. In addition, the results suggest that endogenous catecholamines have the ability to promote insulin secretion.

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Authors and Affiliations

  1. Departments of Pharmacology and Histology, University of Lund, Lund

    B. Ahrén, L. E. Ericson, I. Lundquist, I. Lorén & F. Sundler

  2. Department of Anatomy, University of Gothenburg, Gothenburg, Sweden

    B. Ahrén, L. E. Ericson, I. Lundquist, I. Lorén & F. Sundler

Authors
  1. B. Ahrén
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  2. L. E. Ericson
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  3. I. Lundquist
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  4. I. Lorén
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  5. F. Sundler
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Ahrén, B., Ericson, L.E., Lundquist, I. et al. Adrenergic innervation of pancreatic islets and modulation of insulin secretion by the sympatho-adrenal system. Cell Tissue Res. 216, 15–30 (1981). https://doi.org/10.1007/BF00234541

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