A pathway from leukemogenic oncogenes and stem cell chemokines to RNA processing via THOC5

Griaud, F., Pierce, A., Gonzalez Sanchez, M.B., Scott, M. , Abraham, S.A., Holyoake, T.L., Tran, D.D.H., Tamura, T. and Whetton, A.D. (2013) A pathway from leukemogenic oncogenes and stem cell chemokines to RNA processing via THOC5. Leukemia, 27(4), pp. 932-940. (doi: 10.1038/leu.2012.283)

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Abstract

THOC5 is a member of the THO complex that is involved in processing and transport of mRNA. We have shown previously that hematopoietic stem cells have an absolute requirement for THOC5 for survival and that THOC5 is phosphorylated on tyrosine 225 as a consequence of leukemogenic protein tyrosine kinase (PTK) action. We have investigated pathways for THOC5 phosphorylation to develop an understanding of THO complex modulation by tyrosine kinase (TK) oncogenes in leukemias. We demonstrate that THOC5 phosphorylation is mediated by Src PTK and CD45 protein tyrosine phosphatase action and that this event is sensitive to oxidative status. We show that THOC5 phosphorylation is elevated in stem cells from patients with chronic myeloid leukemia (CML) and that this phosphorylation is sensitive to the frontline drugs used in CML treatment. Further we show that THOC5 Y225 phosphorylation governs mRNA binding. In addition, CXCL12 is shown to induce THOC5 Y225 phosphorylation, and site-directed mutagenesis demonstrates that this modulates motile response. In conclusion, we delineate a signaling pathway stimulated by leukemogenic PTKs, chemokines and oxidative stress that can affect THO complex mediation of gene expression describing mechanisms for post-transcriptional regulation of protein levels.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Scott, Dr Mary and Holyoake, Professor Tessa and Abraham, Dr Sheela
Authors: Griaud, F., Pierce, A., Gonzalez Sanchez, M.B., Scott, M., Abraham, S.A., Holyoake, T.L., Tran, D.D.H., Tamura, T., and Whetton, A.D.
College/School:College of Medical Veterinary and Life Sciences > School of Cancer Sciences
Journal Name:Leukemia
ISSN:0887-6924
ISSN (Online):1476-5551

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
494701A phosphoproteomic investigation of key BCR-ABL mediated signally pathways in CML stem cells: where does tyrosine kinase inhibitor resistance lie?Tessa HolyoakeLeukaemia & Lymphoma Research (LRF)08071RI CANCER SCIENCES