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Journal of Histochemistry and Cytochemistry, Vol. 51, 715-726, June 2003, Copyright © 2003, The Histochemical Society, Inc.

ARTICLE

Enhanced Serine Palmitoyltransferase Expression in Proliferating Fibroblasts, Transformed Cell Lines, and Human Tumors

Jill M. Cartona, David J. Uhlingerb, Ameesha D. Bathejab, Claudia Derianc, George Hob, Dennis Argenterib, and Michael R. D'Andreac
a Department of Molecular and Cellular Biology, Centocor, Inc., Malvern, Pennsylvania
b Drug Discovery, Johnson & Johnson Pharmaceutical Research & Development, Raritan, New Jersey
c Spring House, Pennsylvania

Correspondence to: David J. Uhlinger, Johnson & Johnson Pharmaceutical Research & Development, Raritan, NJ 08869. E-mail: duhlinger@prdus.jnj.com

Metastatic processes, including cell invasion, extracellular matrix degradation, and tissue remodeling, require cellular reorganization and proliferation. The cell signaling molecules required and the proteins involved in cell restructuring have not been completely elucidated. We have been studying the role of sphingolipids in normal cell activity and in several pathophysiological states. In this study we used immunohistochemistry to observe the presence of the two known subunits of serine palmitoyltransferase (SPT) in proliferating cells, in an in vitro model of wound repair, and in human malignant tissue. We report increased expression of the two subunits, SPT1 and SPT2, in the proliferating cells in these models. We also demonstrate a change in subcellular localization of the SPT subunits from predominantly cytosolic in quiescent cells to nuclear in proliferating cells. In addition, we observed SPT1 and SPT2 immunoreactivity in reactive stromal fibroblasts surrounding the carcinoma cells of some of the tumors. This enhanced SPT expression was absent in the stromal fibroblasts surrounding normal epithelial cells. Our results suggest a potential role for overexpression of SPT in the processes of cell metastasis.

(J Histochem Cytochem 51:715–726, 2003)

Key Words: serine palmitoyltransferase, metastatic carcinomas, macrophages, immunohistochemistry, reactive fibroblasts, tumor microenvironment


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