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Published in: Pathology & Oncology Research 2/2020

Open Access 01-04-2020 | Pleural Mesothelioma | Original Article

The Investigation of Lipoxygenases as Therapeutic Targets in Malignant Pleural Mesothelioma

Authors: Lily Oguh-Olayinka, Vijay Agarwal, Dulani Ranatunge, Anne Campbell, Stefan Laufer, Lynn Cawkwell, Michael J. Lind

Published in: Pathology & Oncology Research | Issue 2/2020

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Abstract

Advanced malignant pleural mesothelioma (MPM) has an extremely poor prognosis with limited chemotherapy options, therefore the identification of new therapeutic targets would aid in disease management. Arachidonic acid is metabolised by cyclooxygenase and lipoxygenase enzymes. The lipoxygenase isoenzymes 5-LOX and 12-LOX have been implicated in carcinogenesis. We aimed to examine 5-LOX and 12-LOX protein expression in a large retrospective series of mesothelioma samples. Further to this, the in vitro cytotoxic effects of lipoxygenase pathway inhibitors were investigated in mesothelioma cells. Archival samples from 83 patients with MPM were examined by immunohistochemistry for expression of the 5-LOX and 12-LOX proteins. The MTS assay was used to assess cell viability following 72 h treatment with the lipoxygenase pathway inhibitors baicalein, licofelone, MK-886 and zileuton in the MPM cell lines NCI-H2052, NCI-H2452 and MSTO-211H. Positive 12-LOX protein expression was recorded in 69/83 (83%) and positive 5-LOX expression was observed in 56/77 (73%) of MPM tissue samples. Co-expression of 5-LOX with 12-LOX was seen in 46/78 (58%) of MPM samples. Positive expression of 5-LOX, 12-LOX and COX-2 proteins was identified in the NCI-H2052, NCI-H2452 and MSTO-211H MPM cell lines. Baicalein (12-LOX and 15-LOX inhibitor) was effective in 3/3 MPM cell lines at low concentrations with an IC50 range of 9.6 μM to 20.7 μM. We have demonstrated that the 5-LOX and 12-LOX proteins are expressed in a significant proportion of MPM samples (73% and 83% respectively) and may represent novel therapeutic targets in this disease. We have demonstrated that the inhibition of the LOX pathway using baicalein may be effective as a novel treatment for MPM, however further human pharmacokinetic studies are required in order to establish whether the concentration used in vitro is clinically achievable.
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Metadata
Title
The Investigation of Lipoxygenases as Therapeutic Targets in Malignant Pleural Mesothelioma
Authors
Lily Oguh-Olayinka
Vijay Agarwal
Dulani Ranatunge
Anne Campbell
Stefan Laufer
Lynn Cawkwell
Michael J. Lind
Publication date
01-04-2020
Publisher
Springer Netherlands
Published in
Pathology & Oncology Research / Issue 2/2020
Print ISSN: 1219-4956
Electronic ISSN: 1532-2807
DOI
https://doi.org/10.1007/s12253-019-00652-x

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