Picture of wind turbine against blue sky

Open Access research with a real impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

The Energy Systems Research Unit (ESRU) within Strathclyde's Department of Mechanical and Aerospace Engineering is producing Open Access research that can help society deploy and optimise renewable energy systems, such as wind turbine technology.

Explore wind turbine research in Strathprints

Explore all of Strathclyde's Open Access research content

The sphingosine kinase 1 inhibitor 2-(P-hydroxyanilino)-4-(P-chlorophenyl)thiazole induces proteasomal degradation of sphingosine kinase 1 in mammalian cells

Loveridge, Carolyn and Tonelli, Francesca and Leclercq, Tamara and Lim, Keng Gat and Long, Jaclyn S and Berdyshev, Evgeny and Tate, Rothwelle J and Natarajan, Viswanathan and Pitson, Stuart M and Pyne, Nigel J and Pyne, Susan (2010) The sphingosine kinase 1 inhibitor 2-(P-hydroxyanilino)-4-(P-chlorophenyl)thiazole induces proteasomal degradation of sphingosine kinase 1 in mammalian cells. Journal of Biological Chemistry, 285 (50). pp. 38841-38852.

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

Abstract

Sphingosine kinase 1 (SK1) is an enzyme that catalyses the phosphorylation of sphingosine to produce the bioactive lipid sphingosine 1-phosphate (S1P). We demonstrate here that the SK1 inhibitor, SKi (2-(p-hydroxyanilino)-4-(p-chlorophenyl)thiazole) induces the proteasomal degradation of SK1 in human pulmonary artery smooth muscle cells, androgen-sensitive LNCaP prostate cancer cells, MCF-7 and MCF-7 HER2 breast cancer cells and that this is likely mediated by ceramide as a consequence of catalytic inhibition of SK1 by SKi. Moreover, SK1 is polyubiquitinated under basal conditions, and SKi appears to increase the degradation of SK1 by activating the proteasome. In addition, the proteasomal degradation of SK1a and SK1b in androgen-sensitive LNCaP cells is associated with the induction of apoptosis. However, SK1b in LNCaP-AI cells (androgen-independent) is less sensitive to SKi-induced proteasomal degradation and these cells are resistant to SKi-induced apoptosis, thereby highlighting the ubiquitin-proteasomal degradation of SK1 as an important mechanism controlling cell survival.