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  • Title: Calcitonin gene-related peptide immunoreactive nerve fibers in the developing salivary glands of the rat.
    Author: Salo A, Törnwall J, Virta E, Uusitalo H.
    Journal: Int J Dev Neurosci; 1993 Aug; 11(4):443-9. PubMed ID: 8237463.
    Abstract:
    The appearance and distribution of calcitonin gene-related peptide immunoreactive (CGRP-IR) nerve fibers was studied by indirect immunofluorescence microscopy in the developing salivary glands of the rat at daily age intervals from the 15th day in utero (i.u.) until birth, and subsequently on the 2nd, 5th, 7th, 16th, 30th postnatal (p.n.) days. The findings were compared to samples of adult rats. CGRP-IR fibers appeared on day 20 i.u. both in parotid and submandibular glands. In submandibular glands, fibers were first seen surrounding the developing ductal branches, in the mesenchyme and also in association with developing ducts and blood vessels. In the parotid gland CGRP-IR fibers first appeared around ductal branches and blood vessels on day 20 i.u. and on day 21 i.u. CGRP-IR nerve fibers were found in the mesenchyme and around developing ducts. The density of CGRP-IR fibers was highest between the 2nd and 16th postnatal days, after which the amount of CGRP immunoreactivity slowly decreased to the levels of adult glands. The increase in a number of CGRP-IR nerve fibers especially around the ductal and vascular elements in the developing salivary glands indicates that they may play a role in the functional maturation of salivary glands.
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