Investigating chemoresistance to improve sensitivity of childhood T-cell acute lymphoblastic leukemia to parthenolide.

Autor:	Ede BC; School of Cellular and Molecular Medicine, University of Bristol, UK., Asmaro RR; School of Cellular and Molecular Medicine, University of Bristol, UK., Moppett JP; School of Cellular and Molecular Medicine, University of Bristol, UK.; Bristol Royal Hospital for Children, UK., Diamanti P; School of Cellular and Molecular Medicine, University of Bristol, UK.; Bristol Institute for Transfusion Sciences, NHS Blood and Transplant, UK., Blair A; School of Cellular and Molecular Medicine, University of Bristol, UK allison.blair@bristol.ac.uk.; Bristol Institute for Transfusion Sciences, NHS Blood and Transplant, UK.
Jazyk:	angličtina
Zdroj:	Haematologica [Haematologica] 2018 Sep; Vol. 103 (9), pp. 1493-1501. Date of Electronic Publication: 2018 May 17.
DOI:	10.3324/haematol.2017.186700
Abstrakt:	Current therapies for childhood T-cell acute lymphoblastic leukemia have increased survival rates to above 85% in developed countries. Unfortunately, some patients fail to respond to therapy and many suffer from serious side effects, highlighting the need to investigate other agents to treat this disease. Parthenolide, a nuclear factor kappa (κ)B inhibitor and reactive oxygen species inducer, has been shown to have excellent anti-cancer activity in pediatric leukemia xenografts, with minimal effects on normal hemopoietic cells. However, some leukemia initiating cell populations remain resistant to parthenolide. This study examined mechanisms for this resistance, including protective effects conferred by bone marrow stromal components. T-cell acute leukemia cells co-cultured with mesenchymal stem cells demonstrated significantly enhanced survival against parthenolide (73±11%) compared to cells treated without mesenchymal stem cell support (11±9%). Direct cell contact between mesenchymal cells and leukemia cells was not required to afford protection from parthenolide. Mesenchymal stem cells released thiols and protected leukemia cells from reactive oxygen species stress, which is associated with parthenolide cytotoxicity. Blocking cystine uptake by mesenchymal stem cells, using a small molecule inhibitor, prevented thiol release and significantly reduced leukemia cell resistance to parthenolide. These data indicate it may be possible to achieve greater toxicity to childhood T-cell acute lymphoblastic leukemia by combining parthenolide with inhibitors of cystine uptake. (Copyright© 2018 Ferrata Storti Foundation.)
Databáze:	MEDLINE
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