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Exp Clin Endocrinol Diabetes 2016; 124(05): 324-330
DOI: 10.1055/s-0042-101162
Article
© Georg Thieme Verlag KG Stuttgart · New York

Cell Death Induction by the Indirubin Derivative 7BIO and the BH3 Mimetic Drugs ABT-737 and GX15-070 in Medullary Thyroid Carcinoma Cells

M. Broecker-Preuss
1   Department of Endocrinology and Metabolism, and Division of Laboratory Research, University Hospital Essen, Essen, Germany
2   Current Address: Department of Clinical Chemistry, University Hospital Essen, Essen, Germany
,
N. Becher-Boveleth
1   Department of Endocrinology and Metabolism, and Division of Laboratory Research, University Hospital Essen, Essen, Germany
3   Current Address: Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
,
K. Mann
1   Department of Endocrinology and Metabolism, and Division of Laboratory Research, University Hospital Essen, Essen, Germany
4   Current Address: Center of Endocrinology Alter Hof München, München, Germany
› Institutsangaben
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Publikationsverlauf

received 31. Juli 2015
first decision 03. November 2015

accepted 16. Dezember 2015

Publikationsdatum:
05. Februar 2016 (online)

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Abstract

Purpose: Patients with advanced and metastasized medullary thyroid carcinoma are difficult to treat since tumor cells do not respond to chemotherapeutic treatment and external radiation. Direct induction of cell death is a new therapeutic approach to therapy-resistant tumor cells. In this study we analyzed the effect of the indirubin-derivative 7BIO and the BH3 mimetic drugs ABT-737 and GX15-070 on cell death induction of TT medullary thyroid carcinoma cells.

Methods: TT medullary thyroid carcinoma cell line was treated with 7BIO, ABT-737 and GX15-070. Cell viability was analyzed by MTT assay, while cell death was determined by caspase 3/7 activity, measurement of caspase cleavage products and lactate dehydrogenase liberation assay. LC3B cleavage was analyzed by western blot.

Results: Incubation with all 3 drugs efficiently decreased the number of viable TT cells with IC50 values of 4.1 µM (7BIO), 0.19 µM (ABT-737) and 0.23 µM (GX15-070). The BH3 mimetic ABT-737 caused an apoptotic cell death with caspase activation as expected, while 7BIO- and GX15-070-treatment led to a mixed kind of cell death, where caspase activation was detected but had no effect on viability of TT cells. LC3 conversion as a biochemical marker of autophagic cell death was observed after GX15-070 treatment while LDH release pointed to involvement of necrosis after treatment with all 3 drugs.

Conclusion: The BH3 mimetic drugs ABT-737 and GX15-070 efficiently killed TT medullary thyroid carcinoma cells with low IC50 values, while the indirubin-derivative 7BIO was also effective but with a higher IC50 value. Although the exact kind of cell death and target molecules of 7BIO and GX15-070 are not yet defined, direct induction of cell death may be a new therapeutic option in medullary thyroid carcinoma cells.

Key words

BCL-2 inhibitor - medullary thyroid cancer - apoptosis
 

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