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American Journal of Pathology, Vol 149, 1553-1564, Copyright © 1996 by American Society for Investigative Pathology
REGULAR ARTICLES |
M Loda, P Capodieci, R Mishra, H Yao, C Corless, W Grigioni, Y Wang, C Magi- Galluzzi and PJ Stork
Department of Pathology, Deaconess Hospital, Boston, Massachusetts, USA.
Many mitogens and human oncogenes activate extracellular regulated kinases (ERKs), which in turn convey proliferation signals. ERKs or mitogen-activated protein (MAP) kinases are inactivated in vitro by MAP kinase phosphatases (MKPs). The gene encoding one of these MKPs, MKP-1, is a serum-inducible gene and is transcriptionally activated by mitogenic signals in cultured cells. As MKP-1 has been shown to block DNA synthesis by inhibiting ERKs when expressed at elevated levels in cultured cells, it has been suggested that it may act as a tumor suppressor. MKP-1 mRNA and MAP kinase (ERK-1 and -2) protein expression was assessed in 164 human epithelial tumors of diverse tissue origin by in situ hybridization and immunohistochemistry. MKP-1 was overexpressed in the early phases of prostate, colon, and bladder carcinogenesis, with progressive loss of expression with higher histological grade and in metastases. In contrast, breast carcinomas showed significant MKP-1 expression even when poorly differentiated or in late stages of the disease. MKP-1, ERK-1, and ERK-2 were co-expressed in most tumors examined. In a subset of 15 tumors, ERK-1 enzymatic activity as well as structural alterations that might be responsible for loss of function of MKP-1 during tumor progression, were examined. ERK-1 enzymatic activity was found to be elevated despite MKP-1 overexpression. No loss of 5q35-ter (containing the MKP-1 locus) was detected by polymerase chain reaction in metastases compared with primary tumors. Finally, no mutations were found in the catalytic domain of MKP-1. These data indicate that MKP-1 is an early marker for a wide range of human epithelial tumors and suggest that MKP-1 does not behave as a tumor suppressor in epithelial tumors.
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