Abstract
Iwasaki, S., Yoshizawa, H. and Aoyagi, H. 2012. Immunohistochemical analysis of the distribution of type VI collagen in the lingual mucosa of rats during the morphogenesis of filiform papillae. —Acta Zoologica (Stockholm) 93: 80–87. We examined the distribution after immunostaining of immunofluorescence of type VI collagen, differential interference contrast (DIC) images, and images obtained using confocal laser-scanning microscopy in transmission mode, after toluidine blue staining, during morphogenesis of the filiform papillae, keratinization of the lingual epithelium and myogenesis in the rat tongue on semi-ultrathin sections of epoxy resin-embedded samples. Immunoreactivity specific for type VI collagen was dispersed over a relatively wide range of connective tissue in the mesenchyme of fetuses on day 15 after conception (E15), at which time the lingual epithelium was composed of one or two layers of cuboidal cells and the lingual muscle was barely recognizable. Slight immunoreactivity specific for type VI collagen was scattered within the lamina propria in fetuses on E17 and on E19, and immunoreactivity was relatively distinct on the connective tissue around the lingual muscle during myogenesis. In fetuses on E19, the epithelium was already stratified squamous. At postnatal stages from P0 to P14, keratinization of the lingual epithelium advanced gradually as morphogenesis of the filiform papillae proceeded during postnatal development. In newborns on P0, myogenesis of the tongue was almost completed. The intensity of immunoreactivity specific for type VI collagen at postnatal stages was mainly restricted on the endomysium and perimysium around the lingual muscle, while scant immunoreactivity was evident in the connective tissue in the lamina propria. Immunoreactivity around the fully mature lingual muscle on P7 and P14 was weaker than that on E19 and P0. Thus, type VI collagen appeared in the connective tissue that surrounded the lingual muscles such as the endomysium and perimysium, in parallel with changes in extracellular components during myogenesis of the tongue.
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