title: Comparative Analysis of the Morphology, Ultrastructure, and Glycosylation Pattern of the Jejunum and Ileum of the Wild Rodent Lagostomus maximus.
abstract: Morphological and histochemical analyses were performed to characterize the histology, ultrastructure, and glycosylation pattern of the jejunum and ileum of the wild rodent Lagostomus maximus. Enterocytes, goblet cells, Paneth cells, and enteroendocrine cells were identified in both intestinal epithelia. Two morphological types of enterocytes were identified only in the ileum based on their cytoplasm electron density. Although the histological and ultrastructural examination showed that the epithelia of both anatomical regions were morphologically similar, a certain specialization in their secretory products was evident. The glycosylation pattern of the jejunum and ileum was characterized in situ by histochemical and lectin histochemical methods. Histochemical results revealed the presence of carboxylated and sulfated gycoconjugates in both regions, although sulfomucins were clearly prevalent in the ileum. Sialic acid was highly O-acetylated and particularly abundant in the jejunum. The KOH/PA*/Bh/PAS technique evidenced a more intense histochemical reaction in the jejunal than in the ileum goblet cells, demonstrating a reduction of neutral mucin secretion in the distal small intestine. Further specific differences were revealed by lectin histochemistry. These data evidenced that the nature of mucus varies at different anatomical regions, probably adapted to physiological requirements.
authors.affiliation: Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina.|Instituto de Investigaciones Marinas y Costeras (IIMyC), Departamento de Biología, FCEyN, CONICET-Universidad Nacional de Mar del Plata, Funes 3250 3° piso, 7600, Mar del Plata, Argentina.
authors.forename: María Florencia
authors.initials: MF
authors.lastname: Tano De La Hoz
authors.affiliation: Departamento de Histología y Embriología, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, La Plata, 1900, Argentina.
authors.forename: Mirta Alicia
authors.initials: MA
authors.lastname: Flamini
authors.affiliation: Instituto de Investigaciones Marinas y Costeras (IIMyC), Departamento de Biología, FCEyN, CONICET-Universidad Nacional de Mar del Plata, Funes 3250 3° piso, 7600, Mar del Plata, Argentina.
authors.forename: Alcira Ofelia
authors.initials: AO
authors.lastname: Díaz
mesh_terms: D000818:Animals; D005260:Female; D006031:Glycosylation; D007082:Ileum / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure; D007413:Intestinal Mucosa / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure; D007583:Jejunum / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure; D037102:Lectins / Q000378:metabolism; D008297:Male; D046529:Microscopy, Electron, Transmission; D009077:Mucins / Q000378:metabolism*; D012377:Rodentia / Q000033:anatomy & histology* / Q000502:physiology*
chemical_list: D037102:Lectins; D009077:Mucins
keywords: Lagostomus maximus; glycopattern analysis; morphology; small intestine; ultrastructure