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Journal of Histochemistry and Cytochemistry, Vol. 46, 127-134, Copyright © 1998 by The Histochemical Society, Inc.

ARTICLE

Immunohistochemical Detection of the MUC1 Gene Product in Human Cancers Grown in scid Mice

Udo Schumachera and Elizabeth Adama
a Human Morphology, University of Southampton, Southampton, United Kingdom

Correspondence to: Udo Schumacher, Human Morphology, Univ. of Southampton, Bassett Crescent East, Southampton SO16 7PX, UK.

Alterations in mucin expression have been detected in many clinically relevant cancers and, in particular, the polymorphic epithelial mucin, encoded by the MUC1 gene, has attracted considerable attention. We investigated its expression in human breast, colon, ovarian, lung, and skin cancer cells and their metastases grown in severe combined immunodeficient (scid) mice using three different monoclonal antibodies (HMFG-1, HMFG-2, and SM3). Four of five breast cancer cell lines, three of five colon cancer cell lines, two of three small-cell carcinoma of the lung cell lines, and A 431 cells all expressed the MUC1 gene product. Neuraminidase predigestion often enhanced HMFG-1 immunoreactivity, which was more widespread and stronger than SM3 immunoreactivity. A considerable heterogeneity of MUC1 gene product expression was observed in the same tumors grown in different mice. The binding pattern between single-cell/small-cell clusters (up to 10 cells) and larger cell number aggregates varied. The results indicate that the MUC1 gene expression both in primary tumors and metastases is not tightly controlled within a particular tumor cell line. Because of this heterogeneous antigen expression in vivo, it appears impossible to target all metastatic deposits by a single monoclonal antibody directed against the MUC1 gene product. (J Histochem Cytochem 46:127-134, 1998)

Key Words: breast cancer, colon cancer, human, metastasis, microenvironment, mucin, MUC1, polymorphic epithelial mucin, scid mouse, small-cell lung cancer


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