Abstract
Previous studies of gro and related genes that are overexpressed in transformed fibroblasts suggest that gro may encode a specific growth regulator. However, DNA and protein sequence comparisons reveal relatedness to platelet factor 4 and other proteins involved in the inflammatory response. In this paper, both growth-related and cytokine-induced responses in gro gene expression are described. Human foreskin fibroblasts are shown to express approximately 10-fold elevated gro, myc, and fos mRNAs in response to serum and to phorbol 12-myristate 13-acetate stimulation, with early response kinetics indicative of growth regulation. In response to interleukin 1, however, in growing cells gro mRNA is elevated at least 100-fold but myc remains constant and fos is not expressed, suggesting a second regulatory pathway. In normal cultured mammary epithelial cells, gro is constitutively expressed, and elevated mRNA levels are induced by phorbol 12-myristate 13-acetate, but not by interleukin 1. However, most carcinoma cell lines examined do not express gro mRNA, suggesting a third function of gro as a negative growth regulator in epithelial cells.
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