Tumor Microenvironment and Immune Checkpoints: Pathophysiologic and Diagnostic Aspect

A special issue of Cancers (ISSN 2072-6694). This special issue belongs to the section "Cancer Immunology and Immunotherapy".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 9834

Special Issue Editors


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Guest Editor
Tumor Immunology, Pediatric Hospital Bambino Gesù, Viale San Paolo, 15, 00146 Rome, Italy
Interests: human NK cells; human ILC; tumor microenvironment (human)
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
Interests: PD-L1; cancer; immunotherapy; TIL; computational pathology

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Guest Editor
Tumor Immunology Unit, IRCCS Bambino Gesù Children’s Hospital, 00146 Rome, Italy
Interests: innate lymphoid cells; NK cells; glucocorticoids; immunotherapy
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Tumor Immunology Unit, IRCCS Bambino Gesù Children’s Hospital, 00146 Rome, Italy
Interests: NK cells; PD-1; inhibitory receptors; immunotherapy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The immune system may control tumor growth and metastatic spread through a number of mechanisms involving different cell types and soluble molecules belonging to both innate and adaptive immunity. Thus, innate cells including NK cells, macrophages, neutrophils, and dendritic cells contribute to keep tumor growth in check. In addition, the existence of specific tumor antigens allows cells of adaptive immunity, mostly T cells, to exert a second, more sophisticated, level of control. Despite the efficacy of these defenses, tumors may escape the control of the immune system and even counteract novel, potent immunotherapeutic approaches, including the use of immune checkpoint inhibitors (ICI) or T cells engineered with receptors specific for tumor cell surface antigens (CAR-T). While different mechanisms of escape have been identified (e.g., the loss of HLA-class-I antigens, required for T cell function), a central role is played by the tumor-induced suppressive microenvironment (TME) which may greatly hamper the ability of effector cells to kill tumor cells. The TME is composed of different cell types and soluble factors. Thus, in addition to tumor cells which may express ligands of inhibitory receptors (e.g., PD-L1) or “protective” molecules such as CD47 (“do not eat me” signal), allowing immune evasion, other cells, conditioned by the tumor, contribute to form an inhibitory milieu, mainly through the secretion of soluble factors and cytokines. The mechanisms of inhibition are variegated, spanning from induction of suppressive cells such as regulatory T cells (T-reg), myeloid-derived suppressive cells (MDSC), M2 macrophages, etc., to the expression, on effector cells, of inhibitory receptors (e.g., PD-1) and/or downregulation of activating receptors (e.g., natural cytotoxicity NK receptors, NCR).

This Special Issue will focus on the pathophysiologic and diagnostic aspects of the main antitumor immune response inhibitory mechanisms. It is evident that precise knowledge and detection of suppressive cells, of receptors functioning as true inhibitory checkpoints, as well as soluble factors composing the TME has offered and will offer important clues for precise therapeutic targeting. Indeed, the use of immune checkpoint inhibitors (ICI) has revolutionized the clinical outcome of highly aggressive tumors such as melanoma and lung carcinoma.

Prof. Dr. Lorenzo Moretta
Dr. Enrico Munari
Dr. Linda Quatrini
Dr. Francesca Romana Mariotti
Guest Editors

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Published Papers (5 papers)

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Research

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21 pages, 4925 KiB  
Article
Identification of Tissue-Resident Natural Killer and T Lymphocytes with Anti-Tumor Properties in Ascites of Ovarian Cancer Patients
by Elin Bernson, Oisín Huhn, Veronika Karlsson, Delia Hawkes, Maria Lycke, Valentina Cazzetta, Joanna Mikulak, James Hall, Anna M. Piskorz, Rosalba Portuesi, Domenico Vitobello, Barbara Fiamengo, Gabriele Siesto, Amir Horowitz, Hormas Ghadially, Domenico Mavilio, James D. Brenton, Karin Sundfeldt and Francesco Colucci
Cancers 2023, 15(13), 3362; https://doi.org/10.3390/cancers15133362 - 27 Jun 2023
Cited by 1 | Viewed by 1918
Abstract
Women with ovarian cancer have limited therapy options, with immunotherapy being unsatisfactory for a large group of patients. Tumor cells spread from the ovary or the fallopian tube into the abdominal cavity, which is commonly accompanied with massive ascites production. The ascites represents [...] Read more.
Women with ovarian cancer have limited therapy options, with immunotherapy being unsatisfactory for a large group of patients. Tumor cells spread from the ovary or the fallopian tube into the abdominal cavity, which is commonly accompanied with massive ascites production. The ascites represents a unique peritoneal liquid tumor microenvironment with the presence of both tumor and immune cells, including cytotoxic lymphocytes. We characterized lymphocytes in ascites from patients with high-grade serous ovarian cancer. Our data reveal the presence of NK and CD8+ T lymphocytes expressing CD103 and CD49a, which are markers of tissue residency. Moreover, these cells express high levels of the inhibitory NKG2A receptor, with the highest expression level detected on tissue-resident NK cells. Lymphocytes with these features were also present at the primary tumor site. Functional assays showed that tissue-resident NK cells in ascites are highly responsive towards ovarian tumor cells. Similar results were observed in an in vivo mouse model, in which tissue-resident NK and CD8+ T cells were detected in the peritoneal fluid upon tumor growth. Together, our data reveal the presence of highly functional lymphocyte populations that may be targeted to improve immunotherapy for patients with ovarian cancer. Full article
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16 pages, 3321 KiB  
Article
Neuroblastoma Tumor-Associated Mesenchymal Stromal Cells Regulate the Cytolytic Functions of NK Cells
by Sabina Di Matteo, Maria Antonietta Avanzini, Gloria Pelizzo, Valeria Calcaterra, Stefania Croce, Grazia Maria Spaggiari, Charles Theuer, Gianvincenzo Zuccotti, Lorenzo Moretta, Andrea Pelosi and Bruno Azzarone
Cancers 2023, 15(1), 19; https://doi.org/10.3390/cancers15010019 - 20 Dec 2022
Cited by 7 | Viewed by 1751
Abstract
Neuroblastoma tumor-associated mesenchymal stromal cells (NB-TA-MSC) have been extensively characterized for their pro-tumorigenic properties, while their immunosuppressive potential, especially against NK cells, has not been thoroughly investigated. Herein, we study the immune-regulatory potential of six primary young and senescent NB-TA-MSC on NK cell [...] Read more.
Neuroblastoma tumor-associated mesenchymal stromal cells (NB-TA-MSC) have been extensively characterized for their pro-tumorigenic properties, while their immunosuppressive potential, especially against NK cells, has not been thoroughly investigated. Herein, we study the immune-regulatory potential of six primary young and senescent NB-TA-MSC on NK cell function. Young cells display a phenotype (CD105+/CD90+/CD73+/CD29+/CD146+) typical of MSC cells and, in addition, express high levels of immunomodulatory molecules (MHC-I, PDL-1 and PDL-2 and transcriptional-co-activator WWTR1), able to hinder NK cell activity. Notably, four of them express the neuroblastoma marker GD2, the most common target for NB immunotherapy. From a functional point of view, young NB-TA-MSC, contrary to the senescent ones, are resistant to activated NK cell-mediated lysis, but this behavior is overcome using anti-CD105 antibody TRC105 that activates antibody-dependent cell-mediated cytotoxicity. In addition, proliferating NB-TA-MSC, but not the senescent ones, after six days of co-culture, inhibit proliferation, expression of activating receptors and cytolytic activity of freshly isolated NK. Inhibitors of the soluble immunosuppressive factors L-kynurenine and prostaglandin E2 efficiently counteract this latter effect. Our data highlight the presence of phenotypically heterogeneous NB-TA-MSC displaying potent immunoregulatory properties towards NK cells, whose inhibition could be mandatory to improve the antitumor efficacy of targeted immunotherapy. Full article
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Review

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16 pages, 796 KiB  
Review
Dysregulation of DNAM-1-Mediated NK Cell Anti-Cancer Responses in the Tumor Microenvironment
by Rossella Paolini and Rosa Molfetta
Cancers 2023, 15(18), 4616; https://doi.org/10.3390/cancers15184616 - 18 Sep 2023
Viewed by 1254
Abstract
NK cells play a pivotal role in anti-cancer immune responses, thanks to the expression of a wide array of inhibitory and activating receptors that regulate their cytotoxicity against transformed cells while preserving healthy cells from lysis. However, NK cells exhibit severe dysfunction in [...] Read more.
NK cells play a pivotal role in anti-cancer immune responses, thanks to the expression of a wide array of inhibitory and activating receptors that regulate their cytotoxicity against transformed cells while preserving healthy cells from lysis. However, NK cells exhibit severe dysfunction in the tumor microenvironment, mainly due to the reduction of activating receptors and the induction or increased expression of inhibitory checkpoint receptors. An activating receptor that plays a central role in tumor recognition is the DNAM-1 receptor. It recognizes PVR and Nectin2 adhesion molecules, which are frequently overexpressed on the surface of cancerous cells. These ligands are also able to trigger inhibitory signals via immune checkpoint receptors that are upregulated in the tumor microenvironment and can counteract DNAM-1 activation. Among them, TIGIT has recently gained significant attention, since its targeting results in improved anti-tumor immune responses. This review aims to summarize how the recognition of PVR and Nectin2 by paired co-stimulatory/inhibitory receptors regulates NK cell-mediated clearance of transformed cells. Therapeutic approaches with the potential to reverse DNAM-1 dysfunction in the tumor microenvironment will be also discussed. Full article
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18 pages, 1943 KiB  
Review
B7-H3 in Pediatric Tumors: Far beyond Neuroblastoma
by Cristina Bottino, Chiara Vitale, Alessandra Dondero and Roberta Castriconi
Cancers 2023, 15(13), 3279; https://doi.org/10.3390/cancers15133279 - 21 Jun 2023
Cited by 4 | Viewed by 2376
Abstract
B7-H3 is a 4Ig transmembrane protein that emerged as a tumor-associated antigen in neuroblastoma. It belongs to the B7 family, shows an immunoregulatory role toward NK and T cells, and, therefore, has been included in the growing family of immune checkpoints. Besides neuroblastoma, [...] Read more.
B7-H3 is a 4Ig transmembrane protein that emerged as a tumor-associated antigen in neuroblastoma. It belongs to the B7 family, shows an immunoregulatory role toward NK and T cells, and, therefore, has been included in the growing family of immune checkpoints. Besides neuroblastoma, B7-H3 is expressed by many pediatric cancers including tumors of the central nervous system, sarcomas, and acute myeloid leukemia. In children, particularly those affected by solid tumors, the therapeutic protocols are aggressive and cause important life-threatening side effects. Moreover, despite the improved survival observed in the last decade, a relevant number of patients show therapy resistance and fatal relapses. Immunotherapy represents a new frontier in the cure of cancer patients and the targeting of tumor antigens or immune checkpoints blockade showed exciting results in adults. In this encouraging scenario, researchers and clinicians are exploring the possibility to use immunotherapeutics targeting B7-H3; these include mAbs and chimeric antigen receptor T-cells (CAR-T). These tools are rapidly evolving to improve the efficacy and decrease the unwanted side effects; drug-conjugated mAbs, bi–tri-specific mAbs or CAR-T, and, very recently, NK cell engagers (NKCE), tetra-specific molecules engaging a tumor-associated antigen and NK cells, have been generated. Preclinical data are promising, and clinical trials are ongoing. Hopefully, the B7-H3 targeting will provide important benefits to cancer patients. Full article
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14 pages, 1464 KiB  
Review
Crosstalk between ILC3s and Microbiota: Implications for Colon Cancer Development and Treatment with Immune Check Point Inhibitors
by Fabiana Drommi, Alessia Calabrò, Grazia Vento, Gaetana Pezzino, Riccardo Cavaliere, Fausto Omero, Paola Muscolino, Barbara Granata, Federica D’Anna, Nicola Silvestris, Claudia De Pasquale, Guido Ferlazzo and Stefania Campana
Cancers 2023, 15(11), 2893; https://doi.org/10.3390/cancers15112893 - 24 May 2023
Cited by 2 | Viewed by 2105
Abstract
Type 3 innate lymphoid cells (ILC3s) are primarily tissue-resident cells strategically localized at the intestinal barrier that exhibit the fast-acting responsiveness of classic innate immune cells. Populations of these lymphocytes depend on the transcription factor RAR-related orphan receptor and play a key role [...] Read more.
Type 3 innate lymphoid cells (ILC3s) are primarily tissue-resident cells strategically localized at the intestinal barrier that exhibit the fast-acting responsiveness of classic innate immune cells. Populations of these lymphocytes depend on the transcription factor RAR-related orphan receptor and play a key role in maintaining intestinal homeostasis, keeping host–microbial mutualism in check. Current evidence has indicated a bidirectional relationship between microbiota and ILC3s. While ILC3 function and maintenance in the gut are influenced by commensal microbiota, ILC3s themselves can control immune responses to intestinal microbiota by providing host defense against extracellular bacteria, helping to maintain a diverse microbiota and inducing immune tolerance for commensal bacteria. Thus, ILC3s have been linked to host–microbiota interactions and the loss of their normal activity promotes dysbiosis, chronic inflammation and colon cancer. Furthermore, recent evidence has suggested that a healthy dialog between ILC3s and gut microbes is necessary to support antitumor immunity and response to immune checkpoint inhibitor (ICI) therapy. In this review, we summarize the functional interactions occurring between microbiota and ILC3s in homeostasis, providing an overview of the molecular mechanisms orchestrating these interactions. We focus on how alterations in this interplay promote gut inflammation, colorectal cancer and resistance to therapies with immune check point inhibitors. Full article
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