Abstract
We investigated the effect of the pineal on sympathetic neurons that normally innervate the sublingual gland of the rat. When the pineal gland was transplanted into the sublingual gland, it remained as a distinct mass that was innervated by sympathetic axons. Injection of the retrograde tracer, Fast Blue, into the sublingual gland labelled sympathetic neurons in the ipsilateral superior cervical ganglion (SCG). Thirty per cent of all neurons labelled retrogradely by Fast Blue injection into transplanted pineal glands were immunoreactive for both neuropeptide Y (NPY) and calbindin. This combination is characteristic of sympathetic neurons innervating the pineal gland in its normal location, but not the sympathetic vasoconstrictor neurons normally innervating the sublingual gland. This, and our previous study in which the pineal gland was shown to similarly influence the phenotype of salivary secretomotor neurons, suggests that a range of different functional classes of sympathetic neuron are able to change their phenotype in response to signals released by the pineal gland.
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This work was supported by Project Grant No. 145634 from the National Health and Medical Research Council of Australia
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Chanthaphavong, R.S., Murphy, S.M. & Anderson, C.R. The effect of the transplanted pineal gland on the sympathetic innervation of the rat sublingual gland. Cell Tissue Res 317, 165–172 (2004). https://doi.org/10.1007/s00441-004-0888-4
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DOI: https://doi.org/10.1007/s00441-004-0888-4