Comparative expression of the LINE-1 p40 protein in human breast carcinomas and normal breast tissues.
Oncol Res
; 8(6): 239-47, 1996.
Article
em En
| MEDLINE
| ID: mdl-8895199
ABSTRACT
Human LINE-1 (L1Hs) retrotransposons can act as insertional mutagens and are expressed in a variety of tumors, including breast cancer. The purpose of the present study was to examine expression of the p40 protein encoded by the first open reading frame of a L1Hs element in normal human breast tissue of patients without malignant breast disease and in nontumor breast tissue adjacent to cancer and to compare it to expression in breast carcinomas. An antiserum specific for the L1Hs p40 protein was used to analyze its expression in 5 reduction mammoplasties, 16 primary breast cancers, 1 lymph node metastasis and 13 non-malignant breast tissues adjacent to matched primaries by western blotting and/or immunocytochemistry. The immunoreactive band observed on westerns consistently had a M(r) of approximately 46 kDa. Westerns detected some p40 protein expression in all malignant and nonmalignant tissues examined, although 4 of 5 reduction mammoplasties had very low or trace levels as compared with tumors. Nonmalignant breast tissues adjacent to cancers showed significant western band reactivity, and all 15 tumors were positive. Immunocytochemistry revealed staining specificity of the antibody for epithelial cells. Of 12 invasive carcinomas examined, 100% were positive for the p40 protein, whereas one reduction with benign proliferative disease was very weakly reactive, two histologically normal reductions were negative, and 4 of 6 nonmalignant tissues adjacent to cancers were negative. Our data indicated that expression of the L1Hs p40 protein was often elevated in tumor cells of human breast cancers compared to epithelium of normal mammary gland.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Mama
/
Neoplasias da Mama
/
Carcinoma
/
Transformação Celular Neoplásica
/
Regulação da Expressão Gênica
/
Retroelementos
/
Proteínas de Ligação a DNA
/
Proteínas de Neoplasias
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Middle aged
Idioma:
En
Revista:
Oncol Res
Assunto da revista:
NEOPLASIAS
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Estados Unidos