Abstract
Despite the use of new generation target specific drugs or combination treatments, drug-resistance caused by defective apoptosis signaling remains a major challenge in cancer treatment. A common apoptotic defect in drug-resistant tumor is the failure of cancer cells to undergo Bax/Bak-dependent mitochondrial permeabilization due to impaired signaling of Bcl-2 family proteins. Therefore, Bax and Bak-independent caspase-activating compounds appear to be effective in killing such tumor cells. An image-based cellular platform of caspase sensors in Bax and Bak deficient background allowed us to identify several potential Bax/Bak-independent caspase-activating compounds from a limited high-throughput compound screening. FRET-based caspase sensor probe targeted at the nucleus enabled accurate and automated segmentation, yielding a Z-value of 0.72. Some of the positive hits showed promising activity against drug-resistant human cancer cells expressing high levels of Bcl-2 or Bcl-xL. Using this approach, we describe thiolutin, CD437 and TPEN as the most potentially valuable drug candidates for addressing drug-resistance caused by aberrant expression of Bcl-2 family proteins in tumor cells. The screen also enables the quantification of multiparameter apoptotic events along with caspase activation in HTS manner in live mode, allowing characterization of non-classical apoptosis signaling.
Similar content being viewed by others
Abbreviations
- HTS:
-
High-throughput screening
- DKO:
-
Double knockout
- FRET:
-
Fluorescence resonance energy transfer
- ECFP:
-
Enhanced cyan fluorescent protein
- cyt c :
-
Cytochrome c
- ER:
-
Endoplasmic reticulum
- MMP:
-
Mitochondrial membrane permeabilization
- TMRM:
-
Tetramethyl rhodamine methyl ester
- UPR:
-
Unfolded protein response
References
Hanahan D, Weinberg RA (2000) The hallmarks of cancer. Cell 100:57–70
Miyashita T, Reed JC (1993) Bcl-2 oncoprotein blocks chemotherapy-induced apoptosis in a human leukemia cell line. Blood 81:151–157
Reed JC (1999) Dysregulation of apoptosis in cancer. J Clin Oncol 17:2941–2953
Adams JM, Cory S (1998) The Bcl-2 protein family: arbiters of cell survival. Science 281:1322–1326
Kroemer G (1997) The proto-oncogene Bcl-2 and its role in regulating apoptosis. Nat Med 3:614–620
Dubrez-Daloz L, Dupoux A, Cartier J (2008) IAPs: more than just inhibitors of apoptosis proteins. Cell Cycle 7:1036–1046
Vogler M, Dinsdale D, Dyer MJS, Cohen GM (2008) Bcl-2 inhibitors: small molecules with a big impact on cancer therapy. Cell Death Differ 16:360–367
van Delft MF, Wei AH, Mason KD et al (2006) The BH3 mimetic ABT-737 targets selective Bcl-2 proteins and efficiently induces apoptosis via Bak/Bax if Mcl-1 is neutralized. Cancer Cell 10:389–399
Danial NN (2007) BCL-2 family proteins: critical checkpoints of apoptotic cell death. Clin Cancer Res 13:7254–7263
Ruiz-Vela A, Opferman JT, Cheng EHY, Korsmeyer SJ (2005) Proapoptotic BAX and BAK control multiple initiator caspases. EMBO Rep 6:379–385
Kozopas KM, Yang T, Buchan HL, Zhou P, Craig RW (1993) MCL1, a gene expressed in programmed myeloid cell differentiation, has sequence similarity to BCL2. Proc Natl Acad Sci USA 90:3516–3520
Wei MC, Zong WX, Cheng EHY et al (2001) Proapoptotic BAX and BAK: a requisite gateway to mitochondrial dysfunction and death. Science 292:727–730
Adams JM, Cory S (2007) The Bcl-2 apoptotic switch in cancer development and therapy. Oncogene 26:1324–1337
Lei X, Chen Y, Du G et al (2006) Gossypol induces Bax/Bak-independent activation of apoptosis and cytochrome c release via a conformational change in Bcl-2. FASEB J 20:2147–2149
Lomonosova E, Ryerse J, Chinnadurai G (2009) BAX/BAK-independent mitoptosis during cell death induced by proteasome inhibition? Mol Cancer Res 7:1268–1284
Seervi M, Joseph J, Sobhan PK, Bhavya BC, Santhoshkumar TR (2011) Essential requirement of cytochrome c release for caspase activation by procaspase-activating compound defined by cellular models. Cell Death Dis 2:e207
Lindsten T, Thompson CB (2006) Cell death in the absence of Bax and Bak. Cell Death Differ 13:1272–1276
Takemoto K, Nagai T, Miyawaki A, Miura M (2003) Spatio-temporal activation of caspase revealed by indicator that is insensitive to environmental effects. J Cell Biol 160:235–243
Joseph J, Seervi M, Sobhan PK, Retnabai ST (2011) High throughput ratio imaging to profile caspase activity: potential application in multiparameter high content apoptosis analysis and drug-screening. PLoS One 6:e20114
Sobhan PK, Seervi M, Joseph J et al (2012) Identification of heat shock protein 90 inhibitors to sensitize drug resistant side population tumor cells using a cell based assay platform. Cancer Lett 317:78–88
Pradelli LA, Beneteau M, Ricci JE (2010) Mitochondrial control of caspase-dependent and-independent cell death. Cell Mol Life Sci 67:1589–1597
Kroemer G, Galluzzi L, Brenner C (2007) Mitochondrial membrane permeabilization in cell death. Physiol Rev 87:99–163
Mullauer FB, Kessler JH, Medema JP (2009) Betulinic acid induces cytochrome c release and apoptosis in a Bax/Bak-independent, permeability transition pore dependent fashion. Apoptosis 14:191–202
Petronilli V, Penzo D, Scorrano L, Bernardi P, Di Lisa F (2001) The mitochondrial permeability transition, release of cytochrome c and cell death. J Biol Chem 276:12030–12034
Youle RJ, Strasser A (2008) The BCL-2 protein family: opposing activities that mediate cell death. Nat Rev Mol Cell Biol 9:47–59
Ribas J, Yuste VJ, Garrofe-Ochoa X, Meijer L, Esquerda JE, Boix J (2008) 7-Bromoindirubin-3′-oxime uncovers a serine protease-mediated paradigm of necrotic cell death. Biochem Pharmacol 76:39–52
Tait SWG, Green DR (2008) Caspase-independent cell death: leaving the set without the final cut. Oncogene 27:6452–6461
Janssen K, Horn S, Niemann MT, Daniel PT, Schulze-Osthoff K, Fischer U (2009) Inhibition of the ER Ca2+ pump forces multidrug-resistant cells deficient in Bak and Bax into necrosis. J Cell Sci 122:4481–4491
Tischner D, Manzl C, Soratroi C, Villunger A, Krumschnabel G (2012) Necrosis-like death can engage multiple pro-apoptotic Bcl-2 protein family members. Apoptosis 17:1197–1209
Dixon SJ, Lemberg KM, Lamprecht MR et al (2012) Ferroptosis: an iron-dependent form of nonapoptotic cell death. Cell 149:1060–1072
Garrido C, Galluzzi L, Brunet M, Puig PE, Didelot C, Kroemer G (2006) Mechanisms of cytochrome c release from mitochondria. Cell Death Differ 13:1423–1433
Ding Q, Dimayuga E, Markesbery WR, Keller JN (2006) Proteasome inhibition induces reversible impairments in protein synthesis. FASEB J 20:1055–1063
West DC, Qin Y, Peterson QP et al (2012) Differential effects of procaspase-3 activating compounds in the induction of cancer cell death. Mol Pharm 9:1425–1434
Rozman-Pungercar J, Kopitar-Jerala N, Bogyo M et al (2003) Inhibition of papain-like cysteine proteases and legumain by caspase-specific inhibitors: when reaction mechanism is more important than specificity. Cell Death Differ 10:881–888
Acknowledgments
Immoratalized MEF wild type and Bax/Bak DKO cells were kindly provided by Dr. Stanely J. Korsemeyer (Harvard Medical School, Boston, MA , USA). Caspase-3 specific FRET probe, pcDNA3 DEVD (ECFP-DEVD-EYFP) and nuclear targeted SCAT3-NLS (ECFP-DEVD-Venus) plasmids were kindly provided by Dr. Gavin Welsh (University of Bristol, UK) and Dr. Masayuki Miura (University of Tokyo, Japan) respectively. Expression vectors pCDNA3 Bcl-2-EGFP, Bcl-xL-EGFP and ER localizing pcDNA3 Bcl-2Cb5-EGFP were provided by Dr. Clark Distelhorst (Case Western Reserve University, USA). This study was supported by grant from the Innovative Young Biotechnologist Award, Department of Biotechnology, Government of India and research fellowships from University Grants Commission (UGC) to MS, Council of Scientific and Industrial Research (CSIR) to JJ and Indian Council of Medical Research (ICMR) to PKS and KAM. We sincerely thank Prof. M. Radhakrishna Pillai for helping throughout, Mrs. Indu Ramachandran and Ms. Aparna Asok for FACS analysis.
Conflict of interest
The authors disclose no potential conflicts of interest.
Author information
Authors and Affiliations
Corresponding author
Electronic supplementary material
Below is the link to the electronic supplementary material.
Supplementary material 7 (MPG 230 kb)
Supplementary material 8 (MPG 340 kb)
Supplementary material 9 (AVI 478 kb)
Supplementary material 10 (AVI 518 kb)
Rights and permissions
About this article
Cite this article
Seervi, M., Sobhan, P.K., Mathew, K.A. et al. A high-throughput image-based screen for the identification of Bax/Bak-independent caspase activators against drug-resistant cancer cells. Apoptosis 19, 269–284 (2014). https://doi.org/10.1007/s10495-013-0921-8
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10495-013-0921-8