ABSTRACT
It has been demonstrated that parotid glands of rats infected with Trypanosoma cruzi present severe histological alterations; changes include reduction in density and volume of the acini and duct systems and an increase in connective tissue. We evaluated the association between morphological changes in parotid glands, circulating testosterone levels and epidermal growth factor receptor (EGF-R) expression in experimental Chagas disease in rats. Animals at 18 days of infection (acute phase) showed a significant decrease in body weight, serum testosterone levels and EGF-R expression in the parotid gland compared with a control group. Since decreases in body weight could lead to a reduction in circulating testosterone concentration, we believe that the reduction in EGF-R expression in parotid glands of infected rats is due to alterations in testosterone levels and atrophy of parotid glands is caused by changes in EGF-R expression. Additionally, at 50 days (chronic phase) of infection parotid glands showed a normal histological aspect likely due to the normalization of the body weight. These findings suggest that the testosterone-EGF-R axis is involved in the histological changes.
Subject(s)
Animals , Male , Rats , Chagas Disease , Epidermal Growth Factor/metabolism , Parotid Gland/chemistry , Trypanosoma cruzi , Testosterone/metabolism , Acute Disease , Chronic Disease , Chagas Disease/metabolism , Chagas Disease/pathology , Epidermal Growth Factor/analysis , Parotid Gland/metabolism , Parotid Gland/parasitology , Parotid Gland/pathology , Rats, Sprague-Dawley , Time Factors , Testosterone/blood , Weight LossABSTRACT
Rhinosporidiosis is a benign chronic granulomatous infection caused by Rhinosporidium seeberi. Rhinosporidiosis is endemic in south Asia, notably in southern India and Sri Lanka. Majority of the cases have been reported to occur in upper respiratory sites, notably anterior nares, nasal cavity, nasopharynx, larynx and soft palate. Only two rare cases of involvement of parotid duct, have been reported in literature. Hence, this case will probably be the third to be reported.
Subject(s)
Aged , Animals , Humans , Male , Parotid Diseases/diagnosis , Parotid Diseases/parasitology , Parotid Diseases/surgery , Parotid Gland/parasitology , Parotid Gland/pathology , Parotid Gland/surgery , Rhinosporidiosis/diagnosis , Rhinosporidiosis/surgery , Rhinosporidium/isolation & purification , Rhinosporidium/pathogenicity , Salivary Ducts/parasitology , Salivary Ducts/pathology , Salivary Ducts/surgeryABSTRACT
La hidatidosis extraabdominal y extrapulmonar es excepcional y compromete un amplio espectro de localizaciones que habitualmente son respetadas por esta parasitosis. Se presentan 11 pacientes con quistes hidatídicos primitivos extraabdominales y extrapulmonares operados en un período de 20 años, que representan el 1,9 por ciento de todos los casos nuevos de hidatidosis operados en ese lapso. La parasitosis se ubicó en 2 casos en glándula tiroides, 1 en parótida, 1 en mama, 5 en músculos, 1 en región perianal y 1 en triángulo posterior del cuello. Seis enfermos fueron del sexo femenino y 5 del masculino; la mediana de edad fue de 36 años con un margen de 8 a 65 años. La procedencia fue del área rural en 10 pacientes. El diagnóstico preoperatorio fue correctamente realizado en 4 (36 por ciento) enfermos, donde la punción aspirativa jugó un papel fundamental. Todos los casos fueron tratados quirúrgicamente sin presentarse complicaciones ni mortalidad asociadas a la cirugía. En pacientes con tumores extraabdominales y extrapulmonares provenientes de regiones de hidatidosis endémica, debe tenerse presente el diagnóstico de quiste hidatídico y realizar estudios complementarios conducentes a confirmar el diagnóstico, destacando la punción aspirativa del quiste que puede proporcionar el diagnóstico de certeza de la parasitosis