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Nitric oxide synthase immunoreactive nerves in rat and ferret salivary glands, and effects of denervation

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Abstract

Nitric oxide has been implicated in mechanisms mediating nerve-evoked vasodilatory and secretory responses in salivary glands. In the present study, the occurrence and distribution of nitric oxide synthase (NOS)-immunoreactive nerves in ferret and rat salivary glands were investigated using immunocytochemistry with rabbit and sheep NOS antisera, and using NADPH-diaphorase enzyme histochemistry. In the parotid, submandibular and sublingual glands of the rat and the ferret, NOS-immunoreactive varicose terminals encircled acini and arteries of various sizes. In the ferret, collecting ducts were also supplied with NOS-immunoreactive fibres. In the rat, only the granular ducts of the submandibular gland were supplied with such fibres. The NOS-immunoreactive innervation of acinar cells was more abundant in the rat than in the ferret, whereas the opposite was true for the innervation of blood vessels. No NOS immunoreactivity was observed in the vascular endothelium. In both species, NOS-positive ganglionic cell bodies were found in the hilar regions of the submandibular and sublingual glands, whereas none could be detected in the parotid glands. NADPH-diaphorase reactivity had the same neuronal distribution as NOS immunoreactivity and, in addition, NADPH-diaphorase reactivity was expressed in ductal epithelium. Neither sympathetic denervation (by removal of the superior cervical ganglion) nor treatment with the sensory neurotoxin capsaicin reduced the NOS-immunoreactive innervation of the parotid gland. However, parasympathetic denervation (by cutting the auriculo-temporal nerve) caused an almost total disappearance of the NOS-immunoreactive innervation. The present findings provide a morphological background to the suggested role of nitric oxide in parasympathetic secretory and vascular responses of salivary glands.

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Authors and Affiliations

  1. Department of Pathology, University of Lund, Lund, Sweden

    Per Alm

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

    Jorgen Ekstrzm & Gunnar Tobin

  3. Department of Clinical Pharmacology, University of Lund, Lund, Sweden

    Bengt Larsson & Karl-Erik Andersson

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  1. Per Alm
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  2. Jorgen Ekstrzm
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  3. Bengt Larsson
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  4. Gunnar Tobin
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  5. Karl-Erik Andersson
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Alm, P., Ekstrzm, J., Larsson, B. et al. Nitric oxide synthase immunoreactive nerves in rat and ferret salivary glands, and effects of denervation. J Mol Hist 29, 669–676 (1997). https://doi.org/10.1023/A:1026452715555

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