Phenyl Saligenin Phosphate Induced Caspase-3 and c-Jun N-Terminal Kinase Activation in Cardiomyocyte-Like Cells

Felemban, S.G., Garner, A.C. ORCID: 0000-0003-2488-0623, Smida, F.A., Boocock, D.J. ORCID: 0000-0002-7333-3549, Hargreaves, A.J. ORCID: 0000-0001-9754-5477 and Dickenson, J.M. ORCID: 0000-0002-9683-969X, 2015. Phenyl Saligenin Phosphate Induced Caspase-3 and c-Jun N-Terminal Kinase Activation in Cardiomyocyte-Like Cells. Chemical Research in Toxicology, 28 (11), pp. 2179-2191. ISSN 0893-228X

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At present, little is known about the effect(s) of organophosphorous compounds (OPs) on cardiomyocytes. In this study we have investigated the effects of phenyl saligenin phosphate (PSP), two organophosphorothioate insecticides (diazinon and chlorpyrifos) and their acutely toxic metabolites (diazoxon and chlorpyrifos oxon) on mitotic and differentiated H9c2 cardiomyoblasts. OP-induced cytotoxicity was assessed by monitoring MTT reduction, LDH release and caspase-3 activity. Cytotoxicity was not observed with diazinon, diazoxon or chlorpyrifos oxon (48 h exposure; 200 μM). Chlorpyrifos-induced cytotoxicity was only evident at concentrations >100 μM. In marked contrast, PSP displayed pronounced cytotoxicity towards mitotic and differentiated H9c2 cells. PSP triggered the activation of JNK1/2, but not ERK1/2, p38 MAPK or PKB, suggesting a role for this pro-apoptotic protein kinase in PSP-induced cell death. The JNK1/2 inhibitor SP 600125 attenuated PSP-induced caspase-3 and JNK1/2 activation, confirming the role of JNK1/2 in PSP-induced cytotoxicity. Fluorescently labelled PSP (dansylated PSP) was used to identify novel PSP binding proteins. Dansylated PSP displayed cytotoxicity towards differentiated H9c2 cells. 2D-gel electrophoresis profiles of cells treated with dansylated PSP (25 μM) were used to identify proteins fluorescently labelled with dansylated PSP. Proteomic analysis identified tropomyosin, heat shock protein β-1 and nucleolar protein 58 as novel protein targets for PSP. In summary, PSP triggers cytotoxicity in differentiated H9c2 cardiomyoblasts via JNK1/2-mediated activation of caspase-3. Further studies are required to investigate whether the identified novel protein targets of PSP play a role in the cytotoxicity of this OP, which is usually associated with the development of OP-induced delayed neuropathy.

Item Type: Journal article
Publication Title: Chemical Research in Toxicology
Creators: Felemban, S.G., Garner, A.C., Smida, F.A., Boocock, D.J., Hargreaves, A.J. and Dickenson, J.M.
Publisher: American Chemical Society
Date: 2015
Volume: 28
Number: 11
ISSN: 0893-228X
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 02 Feb 2016 15:52
Last Modified: 09 Jun 2017 13:58

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