The effects of systemic use of nicotine on the rat nasal mucosa: a histopathologic and immunohistochemical study / Efectos del uso sistémico de nicotina sobre la mucosa nasal de la rata: un estudio histopatológico e inmunohistoquímico

ABSTRACT

The objective of this study was to evaluate the histopathologic effects of systemic use of nicotine on the rat nasal mucosa. Twelve adult Sprague-Dawley rats weighing 180-220 g, were used as experimental animals. The rats were divided into Nicotine and control groups. The rats of Nicotine groups (n=6) were administered 2mg/kg Nicotine sulphate for 28 days. The rats of control group (n=6) were only administered 1,5 ml physiologic saline solution subcutaneously for 28 days. All animals were sacrified at the end of the study and nasal tissue samples were removed and prepared for histologic examination. The sections were stained with Hematoxylin and Eosin (H-E) and Periodic acid-Schiff (PAS) and Trichrome-Masson were observed under light microscope. E-cadherin immunreactivity of pseudostrafied epithelial cells of nasal mucosa was assessed by immunohistochemical staining. There were significant differences in average histopathological score between the groups treated and non-treated to nicotine. In nicotine group, degenerative change of epithelial cells and hypertrophy of goblet cells were observed. Leukocytes infiltration was observed in significant areas of connective tissue. E-cadherin expression was significantly decreased in epithelial cells of the nasal mucosa of Nicotine group...

RESUMEN

El objetivo de este estudio fue evaluar los efectos histopatológicos del uso sistémico de nicotina sobre la mucosa nasal de la rata. Se utilizaron como animales de experimentación 12 ratas Sprague-Dawley adultas, entre 180-220 g, divididas en grupos de nicotina y control. Al grupo de nicotina (n = 6) se le administró sulfato de nicotina 2mg/kg durante 28 días. Al grupo control (n = 6) se les administró sólo 1,5 ml de solución salina fisiológica por vía subcutánea durante 28 días. Todos los animales fueron sacrificados al final del estudio. Se tomaron muestras del tejido nasal y se examinaron histológicamente. Las secciones fueron teñidas con H-E, ácido periódico de Schiff (PAS) y tricrómico de Masson, observándose bajo microscopía de luz. Además, se evaluó la inmunoreactividad a E-cadherina de las células del epitelio pseudoestraficado de la mucosa nasal. Hubo diferencias significativas en la puntuación histopatológica media entre los grupos tratados y no tratados con nicotina. En el grupo de nicotina, se observaron cambios degenerativos de las células epiteliales e hipertrofia de las células caliciformes. Se observó una infiltración significativa de leucocitos en diferentes áreas del tejido conectivo. La E-cadherina se redujo significativamente en las células epiteliales de la mucosa nasal del grupo nicotina...