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Identification of metaplastic variants generated by transfection of a nonmetastatic rat mammary epithelial cell line with DNA from a metastatic rat mammary cell line

Jamieson, S., and Rudland, P.S. (1990) Identification of metaplastic variants generated by transfection of a nonmetastatic rat mammary epithelial cell line with DNA from a metastatic rat mammary cell line. American Journal of Pathology, 137 (3). pp. 629-641. ISSN 0002-9440

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Abstract

The rat mammary 37 epithelial cell line yields non-metastasizing adenomas in syngeneic rats. On cellular DNA transfection, a series of cell lines have been isolated that grow in drug-selective medium. Representative transfected cell lines all yield tumors in rats that consist predominantly of spindle cells, but two also contain epithelial-like cells and glandlike elements (C18P, C19P). Immunocytochemical staining for milk fat globule membrane antigens, human callus keratin, and laminin confirms the identity of the epithelial cells and suggests a (myo)epithelial origin for the spindle cells. Some of the transfected cell lines also generate well-differentiated metaplastic elements in their tumors. One cell line (CT4-41) produces rhabdomyoblastic and possibly smooth-muscle-related elements; two (C18P, C19P) produce squamous metaplasia and sebaceous elements; and two (CL1-31, C11P) produce cartilaginous elements. The identities of the heterologous elements are confirmed by immunocytochemical staining for myoglobin, actin (CT4-41), keratin (C18P, C19P), type II collagen, and type II keratan sulfate (CL1-31). Those cell lines that have acquired the ability to metastasize from subcutaneous sites (CT4-41, C18P) reproduce the same metaplastic elements in their metastases. Thus, a cloned mammary epithelial cell line can be made to generate many of the well-differentiated, heterologous elements observed in human breast carcinomas, and this change is often associated with the rat cells acquiring metastatic properties.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jamieson, Dr Susan
Authors: Jamieson, S., and Rudland, P.S.
College/School:College of Medical Veterinary and Life Sciences > School of Medicine > Clinical Specialities
Journal Name:American Journal of Pathology
Journal Abbr.:Am. J. Pathol.
ISSN:0002-9440
ISSN (Online):1525-2191
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