Picture of two heads

Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Sphingomyelin-derived lipids differentially regulate the extracellular signal-regulated kinase 2 (ERK-2) and c-Jun N-terminal kinase (JNK) signal cascades in airway smooth muscle

Pyne, S and Chapman, J and Steele, L and Pyne, N J (1996) Sphingomyelin-derived lipids differentially regulate the extracellular signal-regulated kinase 2 (ERK-2) and c-Jun N-terminal kinase (JNK) signal cascades in airway smooth muscle. European Journal of Biochemistry, 237 (3). pp. 819-826. ISSN 0014-2956

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

In ASM cells platelet-derived growth factor stimulates rapid transient sphingosine phosphate formation, the activation of extracellular signal-regulated kinase 2 (ERK-2), the phosphorylation of p70(56K), and a ninefold increase in DNA synthesis. In contrast, this growth factor fails to activate c-Jun N-terminal kinase (JNK). Based upon these findings, we have tested whether the sphingomyelin-derived sphingolipids play a role in growth factor signalling by assessing their effect on ERK-2, JNK, and p70(56K). We demonstrate that sphingosine phosphate induces the activation of ERK-2, is ineffective against JNK, and fails to induce the phosphorylation of p70(56K). The latter may explain why it is a poor mitogen when added directly to ASM cells. In contrast, sphingosine and cell-permeable ceramides elicit the prominent tyrosyl phosphorylation and activation of JNK, are poor stimulators of ERK-2, and do not induce the phosphorylation of p70(56K). Therefore, the specificity of signalling through either ERK-2 or JNK cascades may be determined by the rapid agonist-dependent interconversion of these sphingomyelin-derived lipids. This may also provide a dynamic mechanism that enables growth factors and cytokines to elicit pleiotropic cell responses, such as proliferation and cell survival. For instance, both ceramide and sphingosine will elicit growth arrest via activation of JNK, whereas sphingosine phosphate will potentiate growth-factor-stimulated DNA synthesis, a consequence of the activation of ERK-2, Furthermore, under certain conditions, sphingosine and ceramide stimulate cAMP formation, a negative modulator of cell growth, whereas sphingosine phosphate depresses cAMP, thereby enhancing its own growth-promoting properties. From these studies, it is evident that sphingosine phosphate displays a signalling profile that is consistent with it mediating part of the action of platelet-derived growth factor.