Digitum Colección:
http://hdl.handle.net/10201/17701
2024-03-29T12:40:32ZSerotonin immunoreactivity in the intermediate lobe of the rat pituitary
http://hdl.handle.net/10201/18251
Título: Serotonin immunoreactivity in the intermediate lobe of the rat pituitary
Autor/es principal/es: Carvajal, J.C.; Carbajo, S.; Carbajo-Pérez, E.; Castro, S.; Rodríguez, J.
Resumen: Immunocytochemical staining for serotonin
(5-HT) in paraffin-embedded sections of rat pituitary
resulted in the localization of reactive nerve fibres and
cell bodies in the intermediate lobe. Immunostaining was
also found in the anterior and posterior lobes. Labelled
nerve fibres appear to enter the intermediate lobe from
the neural lobe through the interlobular spaces. These
fibres are relatively scarce and lightly stained.
Neuroglandular contacts were identified between
varicose nerve endings containing serotonin and
immunoreactive perykarion. It is not clear whether
intermediate lobe cells produced 5-HT themselves
or, alternatively, these cells take in 5-HT from
serotoninergic nerve terminals.1991-01-01T00:00:00ZAn electron microscopic and biochemical study of the effects of cyclic 3', 5'- AMP, ergotamine or propanolol on the lysosomes of newborn rat
hepatocytes
http://hdl.handle.net/10201/18252
Título: An electron microscopic and biochemical study of the effects of cyclic 3', 5'- AMP, ergotamine or propanolol on the lysosomes of newborn rat
hepatocytes
Autor/es principal/es: Kotoulas, Angeliki O.; Kotoulas, Othon B.; Kalamidas, Stefanos
Resumen: The effects of cyclic 3', 5'-AMP, ergotamine
or propranolol on newborn rat liver were studied by
using biochemical assays, electron microscopy and
quantitative morphometry. Cyclic AMP enhanced the
normal postnatal rise in the glycogen-hydrolysing
activity of acid alpha 1,4 glucosidase but had no effect on
the maltose-hydrolysing activity of the enzyme. The
results suggest that these activities may be due to
different enzymes. Propranolol prevented the postnatal
increase in the glycogen-hydrolysing activity of acid
glucosidase and the breakdown of lysosomal glycogen,
indicating that these phenomena represent betaadrenergic
functions in newbom rats. Ergotamine also
inhibited the postnatal increase in this activity and the
lysosomal glycogen mobilization. A reasonable
explanation for these results is that ergotamine interferes
with the action or formation of cyclic AMP.1991-01-01T00:00:00ZUterine Müllerian adenosarcoma with histiocytic (xanthomatous) mesenchymal component
http://hdl.handle.net/10201/18250
Título: Uterine Müllerian adenosarcoma with histiocytic (xanthomatous) mesenchymal component
Autor/es principal/es: Reymundo García, C.; Toro Rojas, M.; Morales Jiménez, G.; López Beltrán, A.; Nogales Ortíz, F.
Resumen: We present an endometrial Müllerian
adenosarcoma in which the sarcomatous component
showed prominent nests of foamy cells that accounted
for 50% of the neoplastic mesenchyma. Such foamy cells
showed occasional cytological atypias and immunohistochemical
features of histiocytic (macrophagic
differentiation in the absence of changes that could
substantiate the presence of an inflammatory infiltration
of foamy histiocytes. These facts suggest histiocytic
differentiation from neoplastic mesenchymal cells. Such
differentiation has been reported in association with
malignant mixed mesodermal tumor, but not in
Müllerian adenosarcoma1991-01-01T00:00:00ZHelicobacter pylori in Barrett's esophagus
http://hdl.handle.net/10201/18249
Título: Helicobacter pylori in Barrett's esophagus
Autor/es principal/es: Ferreres, Joan-Carles; Fernández, Fidel; Rodríguez Vives, Agustín; González-Rodilla, Irene; Ursúa, Inmaculada; Ramos, Rafael; Val-Bernal, José Fernando
Resumen: Barrett's esophagus is an anatomicoclinical
state in which, due to the prolonged action of
gastroesophageal reflux, the squamous epithelium is
replaced by columnar epithelium. Helicobacter pylori
has been implicated in the pathogenesis of various
gastrointestinal disorders and has occasionally been
observed in Barrett's esophagus. The aim of this study is
to determine the incidence of H. pylori in Barrett's
esophagus and try to establish its role in the pathogenesis
of this disorder. H. pylori was observed in 31 biopsies
(44.3%) of the 70 studied, mainly when the epithelium is
of the gastric atrophic-fundic type (p < 0.01).
Its presence shows no relation to the degree of
inflammatory activity and does not seem, therefore, to
play an important role in the pathogenesis of the lesion.1991-01-01T00:00:00Z