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Qin Y, Rouatbi N, Wang JTW, Baker R, Spicer J, Walters AA, Al-Jamal KT. Plasmid DNA ionisable lipid nanoparticles as non-inert carriers and potent immune activators for cancer immunotherapy. J Control Release 2024; 369:251-265. [PMID: 38493950 DOI: 10.1016/j.jconrel.2024.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/08/2024] [Accepted: 03/12/2024] [Indexed: 03/19/2024]
Abstract
Immunotherapy is currently a standard of care in the treatment of many malignancies. However, predictable side effects caused by systemic administration of highly immunostimulatory molecules have been a serious concern within this field. Intratumoural expression or silencing of immunogenic and immunoinhibitory molecules using nucleic acid-based approaches such as plasmid DNA (pDNA) and small interfering RNA (siRNA), respectively, could represent a next generation of cancer immunotherapy. Here, we employed lipid nanoparticles (LNPs) to deliver either non-specific pDNA and siRNA, or constructs targeting two prominent immunotherapeutic targets OX40L and indoleamine 2,3-dioxygenase-1 (IDO), to tumours in vivo. In the B16F10 mouse model, intratumoural delivery of LNP-formulated non-specific pDNA and siRNA led to strong local immune activation and tumour growth inhibition even at low doses due to the pDNA immunogenic nature. Replacement of these non-specific constructs by pOX40L and siIDO resulted in more prominent immune activation as evidenced by increased immune cell infiltration in tumours and tumour-draining lymph nodes. Consistently, pOX40L alone or in combination with siIDO could prolong overall survival, resulting in complete tumour regression and the formation of immunological memory in tumour rechallenge models. Our results suggest that intratumoural administration of LNP-formulated pDNA and siRNA offers a promising approach for cancer immunotherapy.
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Affiliation(s)
- Yue Qin
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Nadia Rouatbi
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Julie Tzu-Wen Wang
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Rafal Baker
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - James Spicer
- Department of Medical Oncology, Guy's and St Thomas' NHS Foundation Trust (GSTT), London SE1 9RT, UK; School of Cancer and Pharmaceutical Sciences, King's College London, London SE1 9RT, UK
| | - Adam A Walters
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK.
| | - Khuloud T Al-Jamal
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK.
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2
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Champiat S, Tselikas L, Farhane S, Raoult T, Texier M, Lanoy E, Massard C, Robert C, Ammari S, De Baère T, Marabelle A. Intratumoral Immunotherapy: From Trial Design to Clinical Practice. Clin Cancer Res 2020; 27:665-679. [PMID: 32943460 DOI: 10.1158/1078-0432.ccr-20-0473] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 06/10/2020] [Accepted: 09/14/2020] [Indexed: 11/16/2022]
Abstract
Systemic immunotherapies such as immune checkpoint blockade targeted at PD(L)1 and CTLA4 have demonstrated their ability to provide durable tumor responses and long-term overall survival benefits for some patients in several solid tumor types. However, a majority of patients remain resistant to these treatments and a significant proportion of them develop severe autoimmune and inflammatory adverse events. Preclinical studies have demonstrated that intratumoral injections of immunostimulatory products (oncolytics, pattern recognition receptor agonists,…) that are able to trigger type I IFN release and enhance tumor antigen presentation on immune cells could generate a strong antitumor immunity and overcome the resistance to systemic immune checkpoint blockade therapies. The intratumoral immunotherapy strategies that are currently in clinical development offer a unique therapeutic and exploratory setting to better understand the immune contexture across tumor lesions of patients with metastatic cancer. Also these local therapeutic products could turn cold tumors into hot and improve the response rates to cancer immunotherapies while diminishing their systemic exposure and toxicities. Intratumoral immunotherapies could prime or boost the immunity against tumors and therefore radically change the combinatorial therapeutic strategies currently pursued for metastatic and local cancers to improve their long-term survival. We aimed to review and discuss the scientific rationale for intratumoral immunotherapy, the challenges raised by this strategy in terms of drug development within clinical trials and the current state-of-the-art regarding the clinical practice of this innovative approach.
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Affiliation(s)
- Stéphane Champiat
- Département d'Innovation Thérapeutique et d'Essais Précoces (DITEP), Gustave Roussy, Université Paris Saclay, Villejuif, France.,Laboratoire de Recherche Translationnelle en Immunothérapie (LRTI), Gustave Roussy, Villejuif, France
| | - Lambros Tselikas
- Laboratoire de Recherche Translationnelle en Immunothérapie (LRTI), Gustave Roussy, Villejuif, France.,Département de Radiologie, Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Siham Farhane
- Gustave Roussy Immunotherapy Program (GRIP), Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Thibault Raoult
- Service de Promotion des Etudes Cliniques (SPEC), Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Matthieu Texier
- Service de Biostatistiques et d'Epidémiologie (SBE), Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Emilie Lanoy
- Service de Biostatistiques et d'Epidémiologie (SBE), Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Christophe Massard
- Département d'Innovation Thérapeutique et d'Essais Précoces (DITEP), Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Caroline Robert
- Département de Médecine Oncologique (DMO), Gustave Roussy, Université Paris Saclay, Villejuif, France.,Université Paris Saclay, Saint-Aubin, France
| | - Samy Ammari
- Département de Radiologie, Gustave Roussy, Université Paris Saclay, Villejuif, France
| | - Thierry De Baère
- Département de Radiologie, Gustave Roussy, Université Paris Saclay, Villejuif, France.,Université Paris Saclay, Saint-Aubin, France
| | - Aurélien Marabelle
- Département d'Innovation Thérapeutique et d'Essais Précoces (DITEP), Gustave Roussy, Université Paris Saclay, Villejuif, France. .,Laboratoire de Recherche Translationnelle en Immunothérapie (LRTI), Gustave Roussy, Villejuif, France.,Gustave Roussy Immunotherapy Program (GRIP), Gustave Roussy, Université Paris Saclay, Villejuif, France
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3
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Comparing the effects of different cell death programs in tumor progression and immunotherapy. Cell Death Differ 2018; 26:115-129. [PMID: 30341424 DOI: 10.1038/s41418-018-0214-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 09/21/2018] [Accepted: 09/26/2018] [Indexed: 12/18/2022] Open
Abstract
Our conception of programmed cell death has expanded beyond apoptosis to encompass additional forms of cell suicide, including necroptosis and pyroptosis; these cell death modalities are notable for their diverse and emerging roles in engaging the immune system. Concurrently, treatments that activate the immune system to combat cancer have achieved remarkable success in the clinic. These two scientific narratives converge to provide new perspectives on the role of programmed cell death in cancer therapy. This review focuses on our current understanding of the relationship between apoptosis and antitumor immune responses and the emerging evidence that induction of alternate death pathways such as necroptosis could improve therapeutic outcomes.
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Abstract
Pleural malignancies remain a serious therapeutic challenge, and are frequently refractory to standard treatment; however, they have the advantage of occurring in an enclosed cavity readily accessible for examination, biopsy, and serial sampling. Novel therapeutics can be administered via intracavitary delivery to maximize efficacy by targeting the site of involvement and potentially mitigating the adverse effects of systemic therapies. The easy accessibility of the pleural space lends itself well to repeated sampling and analysis to determine efficacy and toxicity of a given treatment paradigm. These factors support the rationale for delivery of novel therapeutics directly into the pleural space.
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Affiliation(s)
- Vivek Murthy
- NYU PORT (Pulmonary Oncology Research Team), Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, NYU Langone Health, 550 First Avenue Suite 5D, New York, NY 10016, USA
| | - Keshav Mangalick
- NYU PORT (Pulmonary Oncology Research Team), Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, NYU Langone Health, 550 First Avenue Suite 5D, New York, NY 10016, USA
| | - Daniel H Sterman
- NYU PORT (Pulmonary Oncology Research Team), Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, NYU Langone Health, 550 First Avenue Suite 5D, New York, NY 10016, USA.
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5
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Van der Jeught K, Bialkowski L, Daszkiewicz L, Broos K, Goyvaerts C, Renmans D, Van Lint S, Heirman C, Thielemans K, Breckpot K. Targeting the tumor microenvironment to enhance antitumor immune responses. Oncotarget 2015; 6:1359-81. [PMID: 25682197 PMCID: PMC4359300 DOI: 10.18632/oncotarget.3204] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 12/24/2014] [Indexed: 12/16/2022] Open
Abstract
The identification of tumor-specific antigens and the immune responses directed against them has instigated the development of therapies to enhance antitumor immune responses. Most of these cancer immunotherapies are administered systemically rather than directly to tumors. Nonetheless, numerous studies have demonstrated that intratumoral therapy is an attractive approach, both for immunization and immunomodulation purposes. Injection, recruitment and/or activation of antigen-presenting cells in the tumor nest have been extensively studied as strategies to cross-prime immune responses. Moreover, delivery of stimulatory cytokines, blockade of inhibitory cytokines and immune checkpoint blockade have been explored to restore immunological fitness at the tumor site. These tumor-targeted therapies have the potential to induce systemic immunity without the toxicity that is often associated with systemic treatments. We review the most promising intratumoral immunotherapies, how these affect systemic antitumor immunity such that disseminated tumor cells are eliminated, and which approaches have been proven successful in animal models and patients.
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Affiliation(s)
- Kevin Van der Jeught
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Lukasz Bialkowski
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Lidia Daszkiewicz
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Katrijn Broos
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Cleo Goyvaerts
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Dries Renmans
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Sandra Van Lint
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Carlo Heirman
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Kris Thielemans
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
| | - Karine Breckpot
- Laboratory of Molecular and Cellular Therapy, Department of Immunology-Physiology, Vrije Universiteit Brussel, Laarbeeklaan, Jette, Belgium
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6
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Grille S, Moreno M, Brugnini A, Lens D, Chabalgoity JA. A therapeutic vaccine using Salmonella-modified tumor cells combined with interleukin-2 induces enhanced antitumor immunity in B-cell lymphoma. Leuk Res 2012; 37:341-8. [PMID: 23107422 DOI: 10.1016/j.leukres.2012.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 10/01/2012] [Accepted: 10/05/2012] [Indexed: 12/24/2022]
Abstract
Therapeutic vaccination holds potential as complementary treatment for non-Hodgkin's lymphoma (NHL). B-NHL cells are antigen-presenting cells, but they cannot elicit proper antitumor responses because they lack expression of co-stimulatory molecules. Here, we report a novel approach to design improved whole tumor cell vaccines for B-NHL. We demonstrated that Salmonella infection significantly up-regulates CD80, CD86, CD40 and MHC II expression in lymphoma cells, and that therapeutic vaccination with infected and then irradiated lymphoma cells combined with IL-2 elicits strong anti-tumor specific immunity and extended survival in lymphoma-bearing mice. This may represent the basis of an effective immunotherapy against B-NHL that could be easily translated into the clinics.
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Affiliation(s)
- Sofía Grille
- Laboratory for Vaccine Research, Departamento de Desarrollo Biotecnologico, Instituto de Higiene, School of Medicine, Universidad de la República, Montevideo, Uruguay
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7
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Lousberg EL, Diener KR, Brown MP, Hayball JD. Innate immune recognition of poxviral vaccine vectors. Expert Rev Vaccines 2012; 10:1435-49. [PMID: 21988308 DOI: 10.1586/erv.11.121] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The study of poxviruses pioneered the field of vaccinology after Jenner's remarkable discovery that 'vaccination' with the phylogenetically related cowpox virus conferred immunity to the devastating disease of smallpox. The study of poxviruses continues to enrich the field of virology because the global eradication of smallpox provides a unique example of the potency of effective immunization. Other poxviruses have since been developed as vaccine vectors for clinical and veterinary applications and include modified vaccinia virus strains such as modified vaccinia Ankara and NYVAC as well as the avipox viruses, fowlpox virus and canarypox virus. Despite the empirical development of poxvirus-based vectored vaccines, it is only now becoming apparent that we need to better understand how the innate arm of the immune system drives adaptive immunity to poxviruses, and how this information is relevant to vaccine design strategies, which are the topics addressed in this article.
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Affiliation(s)
- Erin L Lousberg
- Experimental Therapeutics Laboratory, Hanson Institute, Royal Adelaide Hospital, Adelaide, SA, 5000, Australia
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8
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Pastor F, Kolonias D, McNamara JO, Gilboa E. Targeting 4-1BB costimulation to disseminated tumor lesions with bi-specific oligonucleotide aptamers. Mol Ther 2011; 19:1878-86. [PMID: 21829171 DOI: 10.1038/mt.2011.145] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The paucity of costimulation at the tumor site compromises the ability of tumor-specific T cells to eliminate the tumor. Here, we show that bi-specific oligonucleotide aptamer conjugates can deliver costimulatory ligands to tumor cells in situ and enhance antitumor immunity. In poorly immunogenic subcutaneously implanted tumor and lung metastasis models, systemic delivery of an agonistic 4-1BB aptamer ligand conjugated to a prostate specific membrane antigen (PSMA)-binding tumor-targeting aptamer led to inhibition of tumor growth, was more effective than, and synergized with, vaccination, and exhibited a superior therapeutic index compared to costimulation with 4-1BB antibodies. Tumor inhibition was dependent on homing to PSMA-expressing tumor cells and 4-1BB costimulation. Aptamer targeted costimulation is a broadly applicable and clinically feasible approach to enhance the costimulatory environment of disseminated tumor lesions. This study suggests that potentiating naturally occurring antitumor immunity via tumor-targeted costimulation could be an effective approach to elicit protective immunity to control tumor progression in cancer patients.
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Affiliation(s)
- Fernando Pastor
- Department of Microbiology and Immunology, Dodson Interdisciplinary Immunotherapy Institute and Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida, USA
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9
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Intratumoral DNA electroporation induces anti-tumor immunity and tumor regression. Cancer Immunol Immunother 2010; 59:409-17. [PMID: 19730859 DOI: 10.1007/s00262-009-0760-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Accepted: 08/21/2009] [Indexed: 12/27/2022]
Abstract
In situ expression of a foreign antigen and an immune-modulating cytokine by intratumoral DNA electroporation was tested as a cancer therapy regimen. Transgene expression in the tumors was sustained for 2-3 weeks after intratumoral electroporation with mammalian expression plasmid containing firefly luciferase cDNA. Electroporation with cDNA encoding tetanus toxin fragment C (TetC) induced tetanus toxin-binding antibody, demonstrating immune recognition of the transgene product. Intratumoral electroporation with TetC and IL-12 cDNA after mice were treated with CD25 mAb to remove regulatory T cells induced IFN-gamma producing T-cell response to tumor-associated antigen, heavy inflammatory infiltration, regression of established tumors and immune memory to protect mice from repeated tumor challenge. Intratumoral expression of immune-modulating molecules may be most suitable in the neoadjuvant setting to enhance the therapeutic efficacy and provide long-term protection.
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10
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Adoptive transfer of human papillomavirus E7-specific CTL enhances tumor chemoresponse through the perforin/granzyme-mediated pathway. Mol Ther 2009; 17:906-13. [PMID: 19277009 DOI: 10.1038/mt.2009.32] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Adoptive cytotoxic T lymphocyte (CTL) therapy has an important implication in treating cancer patients. Here, we investigate whether adoptive transfer of human papillomavirus (HPV) E7-specific CTL can enhance tumor chemoresponse using an established cervical cancer animal model. Cisplatin-based chemotherapy plus CTL therapy showed an improved therapeutic effectiveness, along with antitumor protective responses to a parental tumor cell rechallenge. Cisplatin treatment dose-dependently increased the expression of Fas, intercellular adhesion molecule (ICAM)-1, and major histocompatibility complex (MHC) class I antigens (Ags) on tumor cells in vitro. However, CTL-expressing FasL failed to improve antitumor activity in vitro and in animals, resulting from nonfunctional Fas expressed on tumor cells. In contrast, ethylene glycol tetraacetic acid (EGTA) treatment blocked increased sensitivity of cisplatin-treated tumor cells to CTL-mediated killing in vitro, suggesting an important role of the perforin/granzyme-mediated pathway for improved therapeutic effectiveness. This notion was further confirmed by perforin knockout animal studies. Thus, this study shows that (i) modulation of Ag (Fas, ICAM-1) expression by tumor cells has little effect on their increased sensitivity to CTL-mediated killing, (ii) improved therapeutic effectiveness is mediated mainly through the perforin/granzyme-mediated tumor killing pathway, and (iii) a combination of chemotherapy and adoptive E7-specific CTL transfer augments antitumor therapeutic activity in vivo. This finding may have important implications for treating HPV-associated cervical cancer.
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Qi CJ, Qian KQ, Ning YL, Ma HB, Wang SZ, Zhang XG. Ligation or cross-linking of CD40 has different effects on AGS gastric cancer cells. Cell Immunol 2009; 259:135-40. [DOI: 10.1016/j.cellimm.2009.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Revised: 06/15/2009] [Accepted: 06/18/2009] [Indexed: 01/09/2023]
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Lazovic J, Jensen MC, Ferkassian E, Aguilar B, Raubitschek A, Jacobs RE. Imaging immune response in vivo: cytolytic action of genetically altered T cells directed to glioblastoma multiforme. Clin Cancer Res 2008; 14:3832-9. [PMID: 18559603 DOI: 10.1158/1078-0432.ccr-07-5067] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Clinical trials have commenced to evaluate the feasibility of targeting malignant gliomas with genetically engineered CTLs delivered directly to the tumor bed in the central nervous system. The objective of this study is to determine a suite of magnetic resonance imaging (MRI) measurements using an orthotopic xenograft murine model that can noninvasively monitor immunologically mediated tumor regression and reactive changes in the surrounding brain parenchyma. EXPERIMENTAL DESIGN Our preclinical therapeutic platform is based on CTL genetic modification to express a membrane tethered interleukin-13 (IL-13) cytokine chimeric T-cell antigen receptor. This enables selective binding and signal transduction on encountering the glioma-restricted IL-13 alpha2 receptor (IL-13Ralpha2). We used MRI to visualize immune responses following adoptive transfer of IL-13Ralpha2-specific CD8+ CTL clones. RESULTS Based on MRI measurements, several phases following IL-13Ralpha2-specific T-cell adoptive transfer could be distinguished, all of which correlated well with glioblastoma regression confirmed on histology. The first detectable changes, 24 hours post-treatment, were significantly increased T2 relaxation times and strongly enhanced signal on T1-weighted postcontrast images. In the next phase, the apparent diffusion coefficient was significantly increased at 2 and 3 days post-treatment. In the last phase, at day 3 after IL-13Ralpha2-specific T-cell injection, the volume of hyperintense signal on T1-weighted postcontrast image was significantly decreased, whereas apparent diffusion coefficient remained elevated. CONCLUSIONS The present study indicates the feasibility of MRI to visualize different phases of immune response when IL-13Ralpha2-specific CTLs are administered directly to the glioma tumor bed. This will further the aim of better predicting clinical outcome following immunotherapy.
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Affiliation(s)
- Jelena Lazovic
- Biological Imaging Center, Beckman Institute, Division of Biology, California Institute of Technology, Pasadena, California, USA
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13
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Anraku I, Mokhonov VV, Rattanasena P, Mokhonova EI, Leung J, Pijlman G, Cara A, Schroder WA, Khromykh AA, Suhrbier A. Kunjin replicon-based simian immunodeficiency virus gag vaccines. Vaccine 2008; 26:3268-76. [PMID: 18462846 PMCID: PMC7115363 DOI: 10.1016/j.vaccine.2008.04.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2007] [Revised: 03/18/2008] [Accepted: 04/03/2008] [Indexed: 12/15/2022]
Abstract
An RNA-based, non-cytopathic replicon vector system, based on the flavivirus Kunjin, has shown considerable promise as a new vaccine delivery system. Here we describe the testing in mice of four different SIVmac239 gag vaccines delivered by Kunjin replicon virus-like-particles. The four vaccines encoded the wild type gag gene, an RNA-optimised gag gene, a codon-optimised gag gene and a modified gag-pol gene construct. The vaccines behaved quite differently for induction of effector memory and central memory responses, for mediation of protection, and with respect to insert stability, with the SIV gag-pol vaccine providing the optimal performance. These results illustrate that for an RNA-based vector the RNA sequence of the antigen can have profound and unforeseen consequences on vaccine behaviour.
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Affiliation(s)
- Itaru Anraku
- Queensland Institute of Medical Research, PO Royal Brisbane Hospital, Brisbane, Queensland, Australia
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14
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Ghoneum M, Badr El-Din NK, Noaman E, Tolentino L. Saccharomyces cerevisiae, the Baker's Yeast, suppresses the growth of Ehrlich carcinoma-bearing mice. Cancer Immunol Immunother 2008; 57:581-92. [PMID: 17891396 PMCID: PMC11030098 DOI: 10.1007/s00262-007-0398-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2007] [Accepted: 08/20/2007] [Indexed: 01/11/2023]
Abstract
This study was undertaken to evaluate the effectiveness and mechanisms of anti-tumor activity of Baker's yeast, Saccharomyces cerevisiae, in immunocompetent mice. Swiss albino mice were inoculated intramuscularly in the right thigh with Ehrlich Ascites Carcinoma (EAC) cells. At day 8, mice bearing Solid Ehrlich Carcinoma tumor (SEC) were intratumorally (IT) injected with killed S. cerevisiae (10 x 10(6) and 20 x 10(6) cells) for 35 days. Histopathology of yeast-treated mice showed extensive tumor degeneration, apoptosis, and ischemic (coagulative) and liquefactive necrosis. These changes are associated with a tumor growth curve that demonstrates a significant antitumor response that peaked at 35 days. Yeast treatment (20 x 10(6) cells) three times a week resulted in a significant decrease in tumor volume (TV) (67.1%, P < 0.01) as compared to PBS-treated mice. The effect was determined to be dependent on dose and frequency. Yeast administered three and two times per week induced significant decrease in TV as early as 9 and 25 days post-treatment, respectively. Administration of yeast significantly enhanced the recruitment of leukocytes, including macrophages, into the tumors and triggered apoptosis in SEC cells as determined by flow cytometry (78.6%, P < 0.01) at 20 x 10(6) cells, as compared to PBS-treated mice (42.6%). In addition, yeast treatment elevated TNF-alpha and IFN-gamma plasma levels and lowered the elevated IL-10 levels. No adverse side effects from the yeast treatment were observed, including feeding/drinking cycle and life activity patterns. Indeed, yeast-treated mice showed significant final body weight gain (+21.5%, P < 0.01) at day 35. These data may have clinical implications for the treatment of solid cancer with yeast, which is known to be safe for human consumption.
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Affiliation(s)
- Mamdooh Ghoneum
- Department of Otolaryngology, Charles R. Drew University of Medicine and Science, 1621 E. 120th Street, Los Angeles, CA 90059, USA.
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