Tumor necrosis factor alpha (TNF)-dependent modulation of immune responses and cell death processes has long been the subject of intense research. Yet, its role in cancer progression is still a matter of debate. Here, we will (i) summarize key findings linking TNF to the promotion or inhibition of tumor progression, (ii) attempt to reconcile some of the contradictory findings, and (iii) describe the scientific rationale for improving the efficacy of immune checkpoint inhibitors via TNF blockade in metastatic melanoma patients.
TNF as Anti-TUMOR Agent
Identified in 1975 and cloned in 1984, TNF was named regarding its capacity to induce the necrosis of transplanted methylcholanthrene-induced sarcomas in mice, when injected at a high concentration in tumors (1, 2). This phenomenon was later related to the ability TNF has to trigger apoptosis of tumor endothelial cells via ligation of the TNFR1 (3, 4). The high systemic toxicity associated with TNF treatment hampered the transposition of such a treatment to the clinic until two research teams developed procedures whereby high concentrations of TNF were perfused in isolated limbs of patients with melanoma or sarcoma (5, 6) (Figure 1). Building on these findings, studies focused on developing new strategies to augment TNF-mediated toxicity toward malignant cells. Notably, a fusion protein coupling TNF to the Cys-Asn-Gly-Arg-Cys peptide, able to target the aminopeptidase N expressed by tumor blood vessels, proved more efficient than TNF alone at reducing tumor growth in murine melanoma and lymphoma models (7), and promoted the efficacy of adoptive T cell transfer therapy (ACT) combined or not with anti-PD-1 treatments in mouse models of melanoma, and prostate carcinoma (8, 9). These results are in line with another work using a homotrimeric murine TNF molecule fused to a single-chain variable fragment (scFv) of the F8 antibody directed against the extra-domain A of fibronectin (10). Targeting this antigen, found in malignant tissues, allowed for TNF delivery in tumors, and favored the efficacy of peptide anticancer vaccine in mouse colon carcinoma. In another study, intra-tumor injection of an oncolytic adenovirus coding for murine TNF, and IL-2 also promoted anti-PD-1 efficacy in mouse melanoma (11). In these settings, improved CD8+ T cell infiltration in tumors was observed upon viral and anti-PD-1 combination therapy, although this phenotype is likely attributable to immune checkpoint blockade as viral therapy alone did not impact this parameter. Thus, delivering high concentrations of TNF in tumors is able to enhance the efficacy of immunotherapy. Of note, the direct impact of TNF on immune activation seemed often limited, and remains to be evaluated in more details. One might suggest however that, in this context, the TNF-induced tumor necrosis should promote some immune activation through the release of “danger signals,” and/or by increasing the delivery of antigens.
Figure 1
Interestingly, antigen-specific CD8+ T cells used TNF as part of their anti-tumor effector arsenal to kill MC38 mouse colon carcinoma cells (12). More precisely, production of TNF by perforin knockout OT-I CD8+ T cells, was toxic for ovalbumin-expressing MC38 cells (MC38Ova) in co-culture experiments. The authors showed that anti-PD-1 therapy slowed the progression of MC38Ova tumors in perforin-deficient animals. This observation suggests that anti-PD-1 treatment could boost CD8+ tumor-infiltrating T lymphocytes (TILs) to use perforin/granzyme-independent cytotoxic mechanisms to impede cancer progression. However, direct implication of TNF in tumor growth control is lacking and would require evaluation of this phenomenon upon anti-PD-1/anti-TNF combination therapy. A recent study showed that tumor cell death following TNF production by CD4+ TILs during ACT required co-treatment with chemotherapeutic agents in murine models of lymphoma as well as colorectal and mammary carcinoma (13). In this work, both production of TNF by antigen-specific CD4+ T cells and chemotherapy were necessary to increase the oxidative stress in tumors hence promoting mouse survival. These findings suggest that even in a context whereby high numbers of antigen-specific T cells manage to reach the tumor, the levels of TNF produced might still be insufficient to kill malignant cells unless they are pre-sensitized to its cytotoxic properties.
Overall, the above-mentioned studies show that despite its potential to activate cell death processes, physiological intra-tumor TNF levels are likely insufficient to induce cancer regression in mice as well as in patients. Finding ways to increase production of this cytokine can potentiate the efficacy of immunotherapy, yet selective targeting of TNF in the tumor mass as well as management of the toxicity associated with such approaches remain a concern.
TNF as pro-TUMOR Agent
The first observation directly linking TNF to tumor promotion came from Prof. F. Balkwill's laboratory. In the DMBA/TPA-induced mouse skin carcinogenesis model, TNF, TNFR1 as well as TNFR2-deficiency markedly reduced papilloma development (14, 15). These results might have seemed counter-intuitive at the time, however, a plethora of research now support them. One argument would be that as much as high TNF levels impede tumor growth, low levels of this cytokine, as observed in tumors, would on the contrary sustain cancer development. As a matter of fact, in the B16 mouse melanoma model, secretion of low levels of TNF by cancer cells promoted the infiltration of tumors with myeloid cells. These were shown to express endothelial markers, which promoted tumor vascularisation and progression (16). In a mouse model of ovarian carcinoma, TNFR1 expression on CD4+ T cells was found necessary for IL-17 secretion and myeloid cell recruitment in tumors, a phenomenon also associated with cancer progression (17). Moreover, our team showed that TNF production in mouse melanoma triggered TNF-R1-dependent activation-induced cell death (AICD) of CD8+ TILs. Blocking TNF/TNFR1 signaling in vivo using targeting antibodies was able to increase the proportion of melanoma-specific CD8+ T cells in the microenvironment and delayed tumor growth (18). Other studies implicated TNF in the activation, function, and/or differentiation of immune regulatory cells, including myeloid-derived suppressor cells (19) or regulatory T cells (20), most likely in a TNF-R2-dependent manner. Considering experiments performed in TNF-deficient animals, the main sources of TNF production in tumors are likely cells from the stroma rather than malignant cells. Interestingly, Donia et al. (21) showed that MHCII expression by patient-derived melanoma cells was associated with increased numbers of CD4+ TILs in tumors, which were able to produce TNF. Additionally, by performing adoptive cell transfer experiments, TNF production by B cells was able to support skin carcinomagenesis (22).
Another interesting notion is the implication of tumor-associated TNF in the dedifferentiation of cancer cells. Indeed, following ACT therapy whereby gp100-specific CD8+ T cells are injected in mouse melanoma tumors, TNF production induces dedifferentiation processes leading to loss of melanocytic markers, decreased immunogenicity, and tumor relapse (23), phenomena which were recently observed in a melanoma patient treated with ACT (24) (Figure 1). TNF involvement in epithelial-to-mesenchymal transition (EMT) was also described in other cancer models including breast, lung, and renal cell carcinoma (25–27). In melanoma, TNF-dependent dedifferentiation processes were also associated with increased expression of immune checkpoint molecules such as PD-L1, and CD73 (28, 29) (Figure 1). Whereas, PD-L1 increase likely depends on NF-κB activation, MAPK signaling pathway, through the c-Jun/AP-1 transcription factor complex, activates CD73 expression (28, 29).
In summary, not only can TNF inhibit anti-tumor immune responses via direct modulation of the activation, function, and survival of leukocytes during cancer progression but it can also alter the phenotype of cancer cells so that they become less visible to T cells, and express immune inhibitory molecules.
Combining TNF Blockade to Immune Checkpoint Blockers to Treat Melanoma
Although melanomas represent only 1% of all skin cancers, they are responsible for the majority of skin cancer deaths. The use of immune checkpoint inhibitors (ICI) considerably improved the prognosis for metastatic melanoma patients with an overall survival of 58% at 3 years when treated with a combination of anti-PD-1 (Nivolumab), and anti-CTLA4 (Ipilimumab) (30). However, median progression-free survival is still only 11.5 months with nearly all patients experiencing mild to severe (grade 3/4) immune-related adverse events (irAE) (Figure 1). Interestingly, Infliximab, a first-generation chimeric TNF blocking antibody is currently being used in the clinic to treat some of the irAEs, mainly colitis, sometimes triggered by ICI (31). The impact anti-TNF antibodies have on anti-cancer immune responses in these settings are not known. A recent study indicates that 1% of patients with advanced melanoma treated by ICI develop severe colitis, which can be efficiently cured with one infliximab infusion in most of the patients, without affecting disease outcome (32). A clinical study evaluating the tolerability of infliximab in advanced cancer patients shows no dose-limiting toxic (DLT) effects and no evidence of disease acceleration in any patient. Moreover, 7 out of 41 patients experienced disease stabilization, including 1 metastatic melanoma patient (33). Other studies indicate the safety and tolerability of administering anti-TNF (etanercept or infliximab) in cancer patients affected with ovarian cancer (34), or renal cell carcinoma (35).
Following on these observations, we emphasized that rather than trying to increase TNF levels in tumors, blocking it may constitute a viable strategy to boost response to ICI. In an immunogenic mouse melanoma model, anti-PD-1 therapy allowed for the regression of 20% of tumors, whereas combining anti-PD-1, and anti-TNF induced the regression of 75% of them (36). This was associated with an increased percentage of CD8+ TILs likely related to reduced AICD. Under these settings, anti-PD-1 therapy promoted the expression of TIM-3, a secondary immune checkpoint molecule at the surface of CD8+ TILs as well as PD-L1 on dendritic cells, and TILs (Figure 1). This phenomenon was abrogated upon anti-PD-1 and anti-TNF co-treatment. Of note, although TNF blockade slightly reduced the production of IFNγ by CD8+ TILs, it did not impact that of granzyme B, suggesting that inhibiting TNF signals does not significantly alter the cytotoxic potential of CD8+ TILs.
These results represented the foundation for starting a phase 1b clinical trial (TICIMEL, NCT03293784), held at the Toulouse Oncopole (promoter: Claudius Regaud institute) funded by Bristol-Myers Squibb (BMS), and directed by Prof N. Meyer, oncodermatologist at the Toulouse cancer center. In TICIMEL, which started in December 2017, 30 patients with metastatic melanoma are for the first time simultaneously treated with TNF blocking antibodies (Infliximab or Certolizumab), and ICI (Nivolumab and Ipilimumab). The primary objective of TICIMEL is to assess the incidence of DLT, evaluated 12 weeks after treatment induction. The secondary objectives are to evaluate (i) the safety and tolerability, (ii) the progression-free survival, and (iii) the objective response rate. For the pharmacodynamic aspects, the systemic as well as the tumor-associated immune activation will be monitored before and during the treatment cycles.
In line with our preclinical findings, Melero, and co-workers recently published an interesting study in mouse colon cancer models, indicating that TNF blockers (anti-TNF or Etanercept) not only improves the anti-tumor effect of ICI (i.e., anti-PD-1 and anti-CTLA-4 combination) but also reduce irAEs (37). TNF blockers enhance the specific immune response, most likely by limiting the AICD of specific CD8 T cells, and neutralize the TNF-dependent colitis, and hepatitis. The benefits of TNF blockade were further documented using the B16-Ova mouse melanoma model, reinforcing our own observations, and further justifying our ongoing TICIMEL clinical trial in advanced melanoma patients.
To summarize, TNF implication in cancer development is rather complex with a balance between high, and low levels of TNF having opposing effects on tumor growth. Finding ways to exploit this balance has the potential to help promoting anti-tumor immune responses and improving the efficacy of existing anti-cancer therapies, especially immunotherapies.
Statements
Author contributions
AM wrote the paper. CC, TL, NA-A, NM, and BS edited the paper.
Funding
This work was supported by Bristol-Myers Squibb (BMS), ROTARY Toulouse clubs, Fondation Toulouse Cancer Santé, INSERM and Paul Sabatier University (Toulouse III), Ligue Nationale contre le cancer, Ligue Régionale conte le cancer, Cancéropôle Grand Sud-Ouest, and Prestige co-financing grant award.
Conflict of interest
NM has worked as an investigator and/or consultant and/or speaker for: BMS, MSD, Amgen, Roche, GSK, Novartis, Pierre Fabre. BS has worked as an investigator and consultant for BMS. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
References
1.
CarswellEAOldLJKasselRLGreenSFioreNWilliamsonB. An endotoxin-induced serum factor that causes necrosis of tumors. Proc Natl Acad Sci USA. (1975) 72:3666–70. 10.1073/pnas.72.9.3666
2.
PennicaDNedwinGEHayflickJSSeeburgPHDerynckRPalladinoMAet al. Human tumour necrosis factor: precursor structure, expression and homology to lymphotoxin. Nature. (1984) 312:724–9. 10.1038/312724a0
3.
RobayeBMosselmansRFiersWDumontJEGalandP. Tumor necrosis factor induces apoptosis (programmed cell death) in normal endothelial cells in vitro. Am J Pathol. (1991) 138:447–53.
4.
TartagliaLAAyresTMWongGHGoeddelDV. A novel domain within the 55 kd TNF receptor signals cell death. Cell. (1993) 74:845–53. 10.1016/0092-8674(93)90464-2
5.
EggermontAMSchraffordt KoopsHKlausnerJMKroonBBSchlagPMLiénardDet al. (1996). Isolated limb perfusion with tumor necrosis factor and melphalan for limb salvage in 186 patients with locally advanced soft tissue extremity sarcomas. the cumulative multicenter European experience. Ann Surg.224, 756–64; discussion 764–55. 10.1097/00000658-199612000-00011
6.
FrakerDLAlexanderHRAndrichMRosenbergSA. Treatment of patients with melanoma of the extremity using hyperthermic isolated limb perfusion with melphalan, tumor necrosis factor, and interferon gamma: results of a tumor necrosis factor dose-escalation study. J Clin Oncol. (1996) 14:479–89. 10.1200/JCO.1996.14.2.479
7.
CurnisFSacchiABorgnaLMagniFGasparriACortiA. Enhancement of tumor necrosis factor alpha antitumor immunotherapeutic properties by targeted delivery to aminopeptidase N (CD13). Nat Biotechnol. (2000) 18:1185–90. 10.1038/81183
8.
CalcinottoAGrioniMJachettiECurnisFMondinoAParmianiGet al. Targeting TNF-α to neoangiogenic vessels enhances lymphocyte infiltration in tumors and increases the therapeutic potential of immunotherapy. J Immunol. (2012) 188:2687–94. 10.4049/jimmunol.1101877
9.
EliaARGrioniMBassoVCurnisFFreschiMCortiAet al. Targeting tumor vasculature with TNF leads effector T cells to the tumor and enhances therapeutic efficacy of immune checkpoint blockers in combination with adoptive cell therapy. Clin Cancer Res. (2018) 24:2171–81. 10.1158/1078-0432.CCR-17-2210
10.
ProbstPStringhiniMRitzDFugmannTNeriD. Antibody-based delivery of TNF to the tumor neovasculature potentiates the therapeutic activity of a peptide anticancer vaccine. Clin Cancer Res. (2019) 25:698–709. 10.1158/1078-0432.CCR-18-1728
11.
Cervera-CarrasconVSiuralaMSantosJMHavunenRTähtinenSKarellPet al. TNFa and IL-2 armed adenoviruses enable complete responses by anti-PD-1 checkpoint blockade. Oncoimmunology. (2018) 7:e1412902. 10.1080/2162402X.2017.1412902
12.
KearneyCJVervoortSJHoggSJRamsbottomKMFreemanAJLalaouiNet al. Tumor immune evasion arises through loss of TNF sensitivity. Sci Immunol. (2018) 3:eaar3451. 10.1126/sciimmunol.aar3451
13.
HabtetsionTDingZCPiWLiTLuCChenTet al. Alteration of tumor metabolism by CD4+ T cells leads to TNF-α-dependent intensification of oxidative stress and tumor cell death. Cell Metab. (2018) 28:228–42.e226. 10.1016/j.cmet.2018.05.012
14.
MooreRJOwensDMStampGArnottCBurkeFEastNet al. Mice deficient in tumor necrosis factor-alpha are resistant to skin carcinogenesis. Nat Med. (1999) 5:828–31. 10.1038/10552
15.
ArnottCHScottKAMooreRJRobinsonSCThompsonRGBalkwillFR. Expression of both TNF-alpha receptor subtypes is essential for optimal skin tumour development. Oncogene. (2004) 23:1902–10. 10.1038/sj.onc.1207317
16.
LiBVincentACatesJBrantley-SiedersDMPolkDBYoungPP. Low levels of tumor necrosis factor alpha increase tumor growth by inducing an endothelial phenotype of monocytes recruited to the tumor site. Cancer Res. (2009) 69:338–48. 10.1158/0008-5472.CAN-08-1565
17.
CharlesKAKulbeHSoperREscorcio-CorreiaMLawrenceTSchultheisAet al. The tumor-promoting actions of TNF-alpha involve TNFR1 and IL-17 in ovarian cancer in mice and humans. J Clin Invest. (2009) 119:3011–23. 10.1172/JCI39065
18.
BertrandFRochotteJColaciosCMontfortATilkin-MariaméAFTouriolCet al. Blocking tumor necrosis factor α enhances CD8 T-cell-dependent immunity in experimental melanoma. Cancer Res. (2015) 75:2619–28. 10.1158/0008-5472.CAN-14-2524
19.
ZhaoXRongLLiXLiuXDengJWuHet al. TNF signaling drives myeloid-derived suppressor cell accumulation. J Clin Invest. (2012) 122:4094–104. 10.1172/JCI64115
20.
TorreyHButterworthJMeraTOkuboYWangLBaumDet al. Targeting TNFR2 with antagonistic antibodies inhibits proliferation of ovarian cancer cells and tumor-associated tregs. Sci Signal. (2017) 10:aaf8608. 10.1126/scisignal.aaf8608
21.
DoniaMAndersenRKjeldsenJWFagonePMunirSNicolettiFet al. Aberrant expression of MHC class II in melanoma attracts inflammatory tumor-specific CD4+ T- cells, which dampen CD8+ T-cell antitumor reactivity. Cancer Res. (2015) 75:3747–59. 10.1158/0008-5472.CAN-14-2956
22.
SchioppaTMooreRThompsonRGRosserECKulbeHNedospasovSet al. B regulatory cells and the tumor-promoting actions of TNF-α during squamous carcinogenesis. Proc Natl Acad Sci USA. (2011) 108:10662–7. 10.1073/pnas.1100994108
23.
LandsbergJKohlmeyerJRennMBaldTRogavaMCronMet al. Melanomas resist T-cell therapy through inflammation-induced reversible dedifferentiation. Nature. (2012) 490:412–6. 10.1038/nature11538
24.
MehtaAKimYJRobertLTsoiJComin-AnduixBBerent-MaozBet al. Immunotherapy resistance by inflammation-induced dedifferentiation. Cancer Discov. (2018) 8:935–43. 10.1158/2159-8290.CD-17-1178
25.
HoMYTangSJChuangMJChaTLLiJYSunGHet al. TNF-α induces epithelial-mesenchymal transition of renal cell carcinoma cells via a GSK3β-dependent mechanism. Mol Cancer Res. (2012) 10:1109–19. 10.1158/1541-7786.MCR-12-0160
26.
LiCWXiaWHuoLLimSOWuYHsuJLet al. Epithelial-mesenchymal transition induced by TNF-α requires NF-κB-mediated transcriptional upregulation of Twist1. Cancer Res. (2012) 72:1290–300. 10.1158/0008-5472.CAN-11-3123
27.
LiaoSJLuoJLiDZhouYHYanBWeiJJet al. TGF-β1 and TNF-α synergistically induce epithelial to mesenchymal transition of breast cancer cells by enhancing TAK1 activation. J Cell Commun Signal. (2019). [Epub ahead of print]. 10.1007/s12079-019-00508-8
28.
ReinhardtJLandsbergJSchmid-BurgkJLRamisBBBaldTGloddeNet al. MAPK signaling and inflammation link melanoma phenotype switching to induction of CD73 during immunotherapy. Cancer Res. (2017) 77:4697–709. 10.1158/0008-5472.CAN-17-0395
29.
ZinggDArenas-RamirezNSahinDRosaliaRAAntunesATHaeuselJet al. The histone methyltransferase Ezh2 controls mechanisms of adaptive resistance to tumor immunotherapy. Cell Rep. (2017) 20:854–67. 10.1016/j.celrep.2017.07.007
30.
WolchokJDChiarion-SileniVGonzalezRRutkowskiPGrobJJCoweyCLet al. Overall survival with combined nivolumab and ipilimumab in advanced melanoma. N Engl J Med. (2017) 377:1345–56. 10.1056/NEJMoa1709684
31.
DraghiABorchTHRadicHDChamberlainCAGokuldassASvaneIMet al. Differential effects of corticosteroids and anti-TNF on tumor-specific immune responses: implications for the management of irAEs. Int J Cancer. (2018) 145:1408–13. 10.1002/ijc.32080
32.
LesageCLongvertCPreySMaanaouiSDrenoBMachetLet al. Incidence and clinical impact of anti-TNFalpha treatment of severe immune checkpoint inhibitor-induced colitis in advanced melanoma: the mecolit survey. J Immunother. (2019) 42:175–9. 10.1097/CJI.0000000000000268
33.
BrownERCharlesKAHoareSARyeRLJodrellDIAirdREet al. A clinical study assessing the tolerability and biological effects of infliximab, a TNF-alpha inhibitor, in patients with advanced cancer. Ann Oncol. (2008) 19:1340–6. 10.1093/annonc/mdn054
34.
MadhusudanSMuthuramalingamSRBraybrookeJPWilnerSKaurKHanCet al. Study of etanercept, a tumor necrosis factor-alpha inhibitor, in recurrent ovarian cancer. J Clin Oncol. (2005) 23:5950–9. 10.1200/JCO.2005.04.127
35.
HarrisonMLObermuellerEMaiseyNRHoareSEdmondsKLiNFet al. Tumor necrosis factor alpha as a new target for renal cell carcinoma: two sequential phase II trials of infliximab at standard and high dose. J Clin Oncol. (2007) 25:4542–9. 10.1200/JCO.2007.11.2136
36.
BertrandFMontfortAMarcheteauEImbertCGilhodesJFilleronTet al. TNFα blockade overcomes resistance to anti-PD-1 in experimental melanoma. Nat Commun. (2017) 8:2256. 10.1038/s41467-017-02358-7
37.
Perez-RuizEMinuteLOtanoIAlvarezMOchoaMCBelsueVet al. Prophylactic TNF blockade uncouples efficacy and toxicity in dual CTLA-4 and PD-1 immunotherapy. Nature. (2019) 569:428–32. 10.1038/s41586-019-1162-y
Summary
Keywords
tumor necrosis factor (TNF), PD-1, CTLA-4, melanoma, immune escape
Citation
Montfort A, Colacios C, Levade T, Andrieu-Abadie N, Meyer N and Ségui B (2019) The TNF Paradox in Cancer Progression and Immunotherapy. Front. Immunol. 10:1818. doi: 10.3389/fimmu.2019.01818
Received
08 March 2019
Accepted
18 July 2019
Published
31 July 2019
Volume
10 - 2019
Edited by
Patrick Legembre, INSERM U1242 Laboratoire COSS, France
Reviewed by
Ignacio Melero, University of Navarra, Spain; Edwin Bremer, University Medical Center Groningen, Netherlands
Updates
Copyright
© 2019 Montfort, Colacios, Levade, Andrieu-Abadie, Meyer and Ségui.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Bruno Ségui bruno.segui@inserm.fr
This article was submitted to Cancer Immunity and Immunotherapy, a section of the journal Frontiers in Immunology
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