Alpha 1-acid glycoprotein (AGP): a possible carrier of sialyl lewis X (slewis X) antigen in colorectal carcinoma.
Histol Histopathol
; 20(1): 91-7, 2005 01.
Article
em En
| MEDLINE
| ID: mdl-15578427
ABSTRACT
OBJECTIVES:
1- to detect alpha 1-acid glycoprotein (AGP) and sialyl Lewis x (sLex) in colorectal malignant, benign and normal samples; 2- to isolate AGP from colorectal cancer and 3- to study its immunoreactivity with an anti-sLex monoclonal antibody (MAb). MATERIALS ANDMETHODS:
tissue and serum samples from 88 patients with colorectal cancer, 22 adenomas and 23 normal were included. Expression of AGP and sLex was studied by immunohistochemistry (IHC); isolationapproach:
AGP was precipitated with ammonium sulphate and immunoprecipitated with anti-AGP MAb. The immune complex formed was isolated by protein A-Sepharose CL-4B affinity chromatography and further eluted; fractions were analysed by SDS-PAGE and Western-blot. Statistical analysis was performed by means of Principal Component Analysis.RESULTS:
By Western blot employing anti-AGP MAb and sLex MAbs, isolated fractions from malignant samples showed a band at about 45 kD. IHC revealed that AGP was expressed in 70% of colorectal carcinoma samples, 50% of benign and 35% of normals. SLex was detected in 31% of malignant samples, 41% of benign and in one normal sample. In malignant samples, AGP reaction comprised the whole specimen with a strong and homogeneous staining while normal and benign samples showed a restricted reaction. In cancer, sLex expression consisted in an intense reactivity in membrane, cellular debris and some cytoplasmic foci while normal and benign samples were occasionally stained. A statistically significant positive correlation was found between AGP and sLex expression. Serum AGP levels were measured by radial immunodiffusion and statistical comparative analysis with tissue expression did not show a correlation between both parameters.CONCLUSION:
AGP may constitute a carrier of sLex in colorectal cancer.
Texto completo:
1
Coleções:
01-internacional
Temas:
Geral
/
Tipos_de_cancer
/
Colon_e_reto
Base de dados:
MEDLINE
Assunto principal:
Oligossacarídeos
/
Orosomucoide
/
Carcinoma
/
Neoplasias Colorretais
Limite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Histol Histopathol
Assunto da revista:
HISTOLOGIA
/
PATOLOGIA
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Argentina