PMID: 9645439Jun 30, 1998Paper

Mitogen-activated protein kinases and apoptosis in PIN

Virchows Archiv : an International Journal of Pathology
C Magi-GalluzziM Loda

Abstract

Mitogen-activated protein (MAP) kinases are key elements of the signalling systems needed to transduce different extracellular messages into cellular responses. At least three parallel MAP kinase pathways have been identified: one, stimulated by serum and growth factors to activate extracellular signal-regulated protein kinases (ERKs) by dual tyrosine and threonine phosphorylation, triggers cell proliferation or differentiation; the other two, induced by a variety of cellular stresses to activate c-jun N-terminal kinases (JNKs) and reactivating kinase (p38/RK), result in growth arrest and induction of apoptosis. Mitogen-activated protein kinase phosphatases (MKPs) inactivate MAP kinases through dephosphorylation and, thus, can modulate the MAP kinase pathways. Expression of JNK-1, ERK-1, p38/RK and MKP-1 proteins was investigated by immunohistochemistry and expression of MKP-1 mRNA by in situ hybridisation in 50 cases of high-grade prostatic intraepithelial neoplasia (PIN), thought to represent the precursor of prostate cancer. The frequency of apoptotic cells was also determined in these cases. Overexpression of the three MAP kinases and MKP-1 mRNA was found in all cases of high-grade PIN compared with normal prostate. Immunor...Continue Reading

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