Death receptors signalling and cancer therapy
- death receptors in cancer biology and anti-cancer therapies
- Fas (TNFRSF6/CD95) multi-signaling
- control of life and death of cancer cells
The effectiveness of current cancer therapies is limited by tumor resistance to chemotherapy and targeted therapies. Combinatorial multi-pathway targeted therapies and the use of predictive biomarkers to stratify patients who may benefit from therapies are key strategies to overcome this therapeutic challenge. They require identification of molecular targets and biomarkers and thus the understanding of molecular basis of signaling pathways that can be targeted in order to reconstitute programmed cell death (apoptosis) and prevent uncontrolled proliferation of cancer cells. In this context, understanding the molecular basis of the imbalance between cell death and cell survival acquired by cancer cells might lead to more efficient and targeted anti-cancer therapy and represents the main goal of our team. Amongst the proteins able to regulate both survival and death functions of the cells are the members of the TNF receptor (TNFR) superfamily.
The multi-modal signaling in many cancer cell types, including colon, breast, and glioblastoma, has been demonstrated for the prototype of the TNFR superfamily, the receptor Fas (TNFRSF6/CD95/APO-1), so far considered a “purely” pro-apoptotic receptor. As Fas activates both cell death and survival, it is a good candidate for targeted therapies promoting or preventing cancer depending on cellular context. Our main recent research accomplishments concern the description of Fas multi-signaling regulation in cancer and its application in cancer therapy. Our work significantly contributed to a clearer understanding of how the Fas signaling is shifted from tumor-suppressing to tumor-driving mode, as well as presented the means to appropriately take control of the duality of Fas signaling in different pathological contexts in order to increase therapeutic success. In continuation of our research interest, we aim to achieve a deeper understanding in the versatility of Fas signaling and to clinically apply the knowledge in colorectal cancer (CRC) therapy. We will dissect the control of Fas signaling in the level of protein modifications, membrane receptor crosstalk, and multi-cellular regulation with the main aim to address the outstanding questions in the field of TNF receptor signaling and cancer cell biology: How does Fas multi-signaling influence CRC cellular functions and behavior and the CRC progression? And how can we use this information to the benefit of anti-cancer therapy?
Influences of Fas pro-survival signal in the control of cancer-promoting functions of the EGFR: Our data reveal a tight relationship and compensation between Fas and ErbB family signaling as well as the indispensable role of Fas in the signaling of major drug targets, EGFR and ErbB2. We aim at elucidating the molecular machinery that controls the dynamic membrane organization of the Fas/ErbB survival signaling hub in different CRC contexts and their functional significance.
Regulation of Fas signaling by cell polarity: We hypothesize that apico-basal polarity is a crucial regulator of Fas signaling. We address the following questions: what is the exact role of cell polarity molecules, and the respective cell-cell adhesion structures, in Fas cell death signaling? Does the localization of the receptor influence its signaling capacity? Do the loss of polarity and the oncogene activation cooperate to switch Fas cell death signaling into the pro-tumoral signalling?
Regulation of T cell activation by the Fas non-apoptotic signaling: recent data support the role of the inhibitory function of Fas engagement by its membrane-bound ligand in TCR signaling. We then aim to dissect the molecular interplay of the TCR and Fas pathways at the membrane-proximal level during the activation of T cells. We believe our data will provide important new insights into the mechanism of primary immune response initiation, which plays a critical role in anti-cancer immunity.
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- Gagnoux-Palacios, L, Hueber, AO. [Cell death for maintaining epithelial homeostasis]. Med Sci (Paris). 2019;35 (11):830-833. doi: 10.1051/medsci/2019164. PubMed PMID:31845871 .
- Rossin, A, Miloro, G, Hueber, AO. TRAIL and FasL Functions in Cancer and Autoimmune Diseases: Towards an Increasing Complexity. Cancers (Basel). 2019;11 (5):. doi: 10.3390/cancers11050639. PubMed PMID:31072029 PubMed Central PMC6563024.
- Gagnoux-Palacios, L, Awina, H, Audebert, S, Rossin, A, Mondin, M, Borgese, F et al.. Cell polarity and adherens junction formation inhibit epithelial Fas cell death receptor signaling. J Cell Biol. 2018;217 (11):3839-3852. doi: 10.1083/jcb.201805071. PubMed PMID:30242034 PubMed Central PMC6219722.
- Ta, NL, Chakrabandhu, K, Huault, S, Hueber, AO. The tyrosine phosphorylated pro-survival form of Fas intensifies the EGF-induced signal in colorectal cancer cells through the nuclear EGFR/STAT3-mediated pathway. Sci Rep. 2018;8 (1):12424. doi: 10.1038/s41598-018-30804-z. PubMed PMID:30127519 PubMed Central PMC6102278.
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- Rossin, A, Lounnas, N, Durivault, J, Miloro, G, Gagnoux-Palacios, L, Hueber, AO et al.. The Btk-dependent PIP5K1γ lipid kinase activation by Fas counteracts FasL-induced cell death. Apoptosis. 2017;22 (11):1344-1352. doi: 10.1007/s10495-017-1415-x. PubMed PMID:28879546 .
- Rossin, A, Hueber, AO. Detection of S-Acylated CD95 by Acyl-Biotin Exchange. Methods Mol Biol. 2017;1557 :189-198. doi: 10.1007/978-1-4939-6780-3_17. PubMed PMID:28078593 .
- Chakrabandhu, K, Huault, S, Hueber, AO. Site-Specific Detection of Tyrosine Phosphorylated CD95 Following Protein Separation by Conventional and Phospho-Protein Affinity SDS-PAGE. Methods Mol Biol. 2017;1557 :173-188. doi: 10.1007/978-1-4939-6780-3_16. PubMed PMID:28078592 .
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- Wang, F, Weng, H, Quon, MJ, Yu, J, Wang, JY, Hueber, AO et al.. Dominant negative FADD dissipates the proapoptotic signalosome of the unfolded protein response in diabetic embryopathy. Am J Physiol Endocrinol Metab. 2015;309 (10):E861-73. doi: 10.1152/ajpendo.00215.2015. PubMed PMID:26419589 PubMed Central PMC4652069.
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Deciphering the regulation of the cell death receptor Fas by cell polarity molecules & adherens junctions in both tumoral and normal human epithelia
Key words: Receptor, Signaling, Cancer, Cell polarity, Cell-Cell jonctions
The PhD student will integrate the research group “death receptors signaling in cancer therapy” (iBV, http://ibv.unice.fr/research-team/hueber). at the Institute of Biology Valrose affiliated to the CNRS, Inserm and University Côte d’Azur (UCA).
Project proposal: Our team is investigating the functions of the cell death receptor Fas/CD95/TNFRSF6, a member of the TNFR superfamily. Fas is considered as a tumor suppressor thanks to its ability to eliminate cancer cells by engaging programmed cell death by apoptosis. However, Fas activation by its ligand (FasL) could also promote tumor development and immune disorders (1). Our group is studying the molecular mechanisms that control the Fas versatile signaling outcome in the context of both normal and cancer cells (2, 3). Our recent data show that formation of adherens junction, a cell-cell adhesion complex, and association with the Dlg1 polarity complex prevent the pro-apoptotic signaling of Fas (4, 5). This new Fas-regulatory mechanism is crucial to protect normal epithelial cells from apoptotic signals and to sense and eliminate abnormal cells from epithelial tissues to prevent pathological outcome such as cancer and chronic inflammatory diseases. The PhD student will pursue this project and decipher the regulation of Fas cell death and non- death signaling by the Cadherin-Dlg1 polarity complex notably by studying Fas receptor signaling/trafficking on both primary and tumoral epithelial human cells by using various cell biology approaches.
Bibliography of the team link to the project: 1- Rossin et al (2019) Cancers, 8;11(5):639. 2- NL t al (2018) Sci Rep, 20;8(1):12424. 3- Chakrabandhu K (2016), PLoS Biol, 4;14(3). 4- Gagnoux-Palacios, L.; et al (2018) Journal of Cell
Biology, 217, 3839-3852. 5- Gagnoux-Palacios L., Hueber AO (2019) Medecine/Sciences. 35(11):830-833.
Technical approaches: Human cell culture; cell death assays; receptor trafficking studies (cell surface labeling, endocytosis assay), protein expression quantification/localization (FACS, IP, IF, IB, ELISA, proteomic); microscopy techniques (confocal imaging, time-lapse).
Candidate profil: We are looking for a highly motivated student, independent and creative, with a Master’s Degree in Cellular, Cancer or Molecular Biology. Prior experience with cell culture and classical cellular and biochemical approaches will be appreciated.
HOW TO APPLY: Interested and motivated students should send as soon as possible a CV, a motivation letter, master scores/ranking and reference letters to both L. GAGNOUX (firstname.lastname@example.org) and A-O HUEBER (email@example.com).
2009-2011 - Equipe Labellisée, La Ligue Contre le Cancer
2006-2011 - Contrat Hospitalier de Recherche Translationnelle (CHRT), Inserm-CHU
2006-2008 - Equipe Labellisée, La Ligue Contre le Cancer
2002 - Cancerology Price Raymond Rosen
2001 - ATIP CNRS
iBV - Institut de Biologie Valrose
Université Nice Sophia Antipolis
Faculté des Sciences
06108 Nice cedex 2