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Monoclonal antibodies to a MUC 4 peptide react with lung cancer
Abstract:
The cDNA of mucin 4 (MUC 4) has been cloned from human tracheo-bronchial cDNA library and MUG 4 was demonstrated to be expressed in normal tracheobronchial and colonic mucosa. However, as there are no antibodies available, there is little information on the distribution of MUC 4 on normal and malignant tissues. A 22 amino-acid peptide (M4.22), derived from the MUC 4 cDNA sequence was synthesized and used to immunise mice and 2 monoclonal antibodies were produced and characterized by ELISA, immunoperoxidase staining and flow cytometry. By ELISA the two anti-MUG 4 mAbs reacted with the immunizing peptide (M4.22), but not with peptides derived from other mucins. By immunoperoxidase staining the mAbs reacted with native mucin expressed in normal colon and to a lesser extent with stomach, but not with normal lung. By contrast, the mAbs reacted most strongly (similar to 70%) with lung cancers. Using six-mer overlapping peptides the minimum number of amino acids in the epitopes detected by the mAbs were TPL (M4.171) and PLPV (M4.275). MUC 4 detected by the mAbs was of a molecular mass (180 kDa) by Western blotting. Using anti-MUC 4 mAbs non-large cell lung cancers were found to be MUC 4 positive compared with normal lung tissues which were negative. By contrast, normal colon was strongly positive but the expression was decreased in colon cancer. These findings could have diagnostic and therapeutic implication for lung cancer.
Insights
Researchers developed new monoclonal antibodies to detect mucin 4 (MUC 4) in tissues. These antibodies show MUC 4 is present in normal colon but highly expressed in lung cancers, suggesting diagnostic and therapeutic potential for lung cancer.
Area of Science:
- Biochemistry
- Immunology
- Oncology
Background:
- Mucin 4 (MUC 4) expression is known in normal tissues, but its distribution in normal and malignant tissues is poorly understood due to lack of antibodies.
- The cDNA for MUC 4 has been cloned, confirming its expression in normal tracheobronchial and colonic mucosa.
Purpose of the Study:
- To develop and characterize monoclonal antibodies (mAbs) against MUC 4.
- To investigate the expression and distribution of MUC 4 in normal and malignant human tissues, particularly lung and colon.
Main Methods:
- Synthesis of a MUC 4 specific peptide (M4.22) for immunization.
- Production and characterization of two anti-MUC 4 mAbs using ELISA, immunoperoxidase staining, and flow cytometry.
- Analysis of MUC 4 expression in tissue samples via immunoperoxidase staining and Western blotting.
Main Results:
- The developed mAbs specifically recognized the MUC 4 peptide and native MUC 4.
- MUC 4 was detected in normal colon but showed decreased expression in colon cancer.
- Significantly higher MUC 4 expression was observed in lung cancers (approximately 70%) compared to normal lung tissue, which was negative.
Conclusions:
- The novel anti-MUC 4 mAbs are effective tools for detecting MUC 4 expression in human tissues.
- MUC 4 expression patterns differ significantly between normal and cancerous tissues, with notable upregulation in lung cancer.
- These findings highlight the potential diagnostic and therapeutic utility of MUC 4 in lung cancer management.
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