Engineering nanoparticles to locally activate T cells in the tumor microenvironment

2019 ◽  
Vol 4 (37) ◽  
pp. eaau6584 ◽  
Author(s):  
Dangge Wang ◽  
Tingting Wang ◽  
Haijun Yu ◽  
Bing Feng ◽  
Lei Zhou ◽  
...  
Keyword(s):  
Tumor Microenvironment ◽  
Laser Irradiation ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Near Infrared ◽  
Checkpoint Inhibitors ◽  
Immunological Tolerance ◽  
Immune Checkpoint Blockade ◽  
Tumor Resistance ◽  
Nir Laser

Immunological tolerance of tumors is characterized by insufficient infiltration of cytotoxic T lymphocytes (CTLs) and immunosuppressive microenvironment of tumor. Tumor resistance to immune checkpoint inhibitors due to immunological tolerance is an ongoing challenge for current immune checkpoint blockade (ICB) therapy. Here, we report the development of tumor microenvironment–activatable anti-PDL1 antibody (αPDL1) nanoparticles for combination immunotherapy designed to overcome immunological tolerance of tumors. Combination of αPDL1 nanoparticle treatment with near-infrared (NIR) laser irradiation–triggered activation of photosensitizer indocyanine green induces the generation of reactive oxygen species, which promotes the intratumoral infiltration of CTLs and sensitizes the tumors to PDL1 blockade therapy. We showed that the combination of antibody nanoparticles and NIR laser irradiation effectively suppressed tumor growth and metastasis to the lung and lymph nodes in mouse models. The nanoplatform that uses the antibody nanoparticle alone both for immune stimulation and PDL1 inhibition could be readily adapted to other immune checkpoint inhibitors for improved ICB therapy.

scholarly journals Oncolytic virotherapy reverses the immunosuppressive tumor microenvironment and its potential in combination with immunotherapy

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yalei Zhang ◽  
Ye Li ◽  
Kun Chen ◽  
Ling Qian ◽  
Peng Wang
Keyword(s):  
Tumor Microenvironment ◽  
Immune Checkpoint ◽  
Checkpoint Inhibitors ◽  
Immune Checkpoint Blockade ◽  
Oncolytic Viruses ◽  
Tumor Resistance ◽  
Systemic Delivery ◽  
Future Directions ◽  
Immunosuppressive Tumor Microenvironment ◽  
Proinflammatory Factors

AbstractIt has been intensively reported that the immunosuppressive tumor microenvironment (TME) results in tumor resistance to immunotherapy, especially immune checkpoint blockade and chimeric T cell antigen therapy. As an emerging therapeutic agent, oncolytic viruses (OVs) can specifically kill malignant cells and modify immune and non-immune TME components through their intrinsic properties or genetically incorporated with TME regulators. Strategies of manipulating OVs against the immunosuppressive TME include serving as a cancer vaccine, expressing proinflammatory factors and immune checkpoint inhibitors, and regulating nonimmune stromal constituents. In this review, we summarized the mechanisms and applications of OVs against the immunosuppressive TME, and strategies of OVs in combination with immunotherapy. We also introduced future directions to achieve efficient clinical translation including optimization of preclinical models that simulate the human TME and achieving systemic delivery of OVs.

scholarly journals Targeting the Tumor Microenvironment for Improving Therapeutic Effectiveness in Cancer Immunotherapy: Focusing on Immune Checkpoint Inhibitors and Combination Therapies

Cancers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1188
Author(s):  
I-Tsu Chyuan ◽  
Ching-Liang Chu ◽  
Ping-Ning Hsu
Keyword(s):  
T Cell ◽  
Tumor Microenvironment ◽  
Cancer Therapy ◽  
Cancer Immunotherapy ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Cell Activity ◽  
Immune Checkpoint Blockade ◽  
Immune Checkpoints

Immune checkpoints play critical roles in the regulation of T-cell effector function, and the effectiveness of their inhibitors in cancer therapy has been established. Immune checkpoint inhibitors (ICIs) constitute a paradigm shift in cancer therapy in general and cancer immunotherapy in particular. Immunotherapy has been indicated to reinvigorate antitumor T-cell activity and dynamically modulate anticancer immune responses. However, despite the promising results in the use of immunotherapy in some cancers, numerous patients do not respond to ICIs without the existence of a clear predictive biomarker. Overall, immunotherapy involves a certain degree of uncertainty and complexity. Research on the exploration of cellular and molecular factors within the tumor microenvironment (TME) aims to identify possible mechanisms of immunotherapy resistance, as well as to develop novel combination strategies involving the specific targeting of the TME for cancer immunotherapy. The combination of this approach with other types of treatment, including immune checkpoint blockade therapy involving multiple agents, most of the responses and effects in cancer therapy could be significantly enhanced, but the appropriate combinations have yet to be established. Moreover, the in-depth exploration of complexity within the TME allows for the exploration of pathways of immune dysfunction. It may also aid in the identification of new therapeutic targets. This paper reviews recent advances in the improvement of therapeutic efficacy on the immune context of the TME and highlights its contribution to cancer immunotherapy.

scholarly journals Rethinking immune checkpoint blockade: ‘Beyond the T cell’

2021 ◽  
Vol 9 (1) ◽  
pp. e001460 ◽  
Author(s):  
Xiuting Liu ◽  
Graham D Hogg ◽  
David G DeNardo
Keyword(s):  
Immune System ◽  
T Cell ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Antitumor Immunity ◽  
Checkpoint Inhibitors ◽  
Clinical Success ◽  
Immune Checkpoint Blockade ◽  
Checkpoint Blockade

The clinical success of immune checkpoint inhibitors has highlighted the central role of the immune system in cancer control. Immune checkpoint inhibitors can reinvigorate anti-cancer immunity and are now the standard of care in a number of malignancies. However, research on immune checkpoint blockade has largely been framed with the central dogma that checkpoint therapies intrinsically target the T cell, triggering the tumoricidal potential of the adaptive immune system. Although T cells undoubtedly remain a critical piece of the story, mounting evidence, reviewed herein, indicates that much of the efficacy of checkpoint therapies may be attributable to the innate immune system. Emerging research suggests that T cell-directed checkpoint antibodies such as anti-programmed cell death protein-1 (PD-1) or programmed death-ligand-1 (PD-L1) can impact innate immunity by both direct and indirect pathways, which may ultimately shape clinical efficacy. However, the mechanisms and impacts of these activities have yet to be fully elucidated, and checkpoint therapies have potentially beneficial and detrimental effects on innate antitumor immunity. Further research into the role of innate subsets during checkpoint blockade may be critical for developing combination therapies to help overcome checkpoint resistance. The potential of checkpoint therapies to amplify innate antitumor immunity represents a promising new field that can be translated into innovative immunotherapies for patients fighting refractory malignancies.

Impact of Use of Antibiotics on Response to Immune Checkpoint Inhibitors and Tumor Microenvironment

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Uqba Khan ◽  
Kaylee Ho ◽  
Eun Kyeong Hwang ◽  
Cristian Peña ◽  
Julianna Brouwer ◽  
...  
Keyword(s):  
Tumor Microenvironment ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors

Volume increase of spleen in melanoma patients undergoing immune checkpoint blockade

Immunotherapy ◽  
2021 ◽  
Author(s):  
Laura Susok ◽  
Dominik Reinert ◽  
Carsten Lukas ◽  
Eggert Stockfleth ◽  
Thilo Gambichler
Keyword(s):  
Immune Checkpoint ◽  
Cutaneous Melanoma ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Immune Checkpoint Blockade ◽  
Clinical Parameters ◽  
Spleen Volume ◽  
Volume Increase ◽  
Computer Tomographic ◽  
Melanoma Patients

Aim: To find out whether treatment with immune checkpoint inhibitors (ICIs) results in volume increase of the spleen. Patient & methods: We studied 49 stage III and IV melanoma patients with an indication for ICIs. Computer tomographic-assisted volumetry of spleens was performed. Results: After 3 months, median spleen volume was significantly increased when compared with the baseline volume. At 3 months, the increase of spleen volume was significantly associated with the use of ipilimumab and ipilimumab plus nivolumab. There was no significant association between spleen volume increase and clinical parameters. Conclusion: The median spleen volume of patients with cutaneous melanoma increases during the first months of ICI treatment, which was particularly attributable to the use of anti-CTLA-4 and anti-CTLA-4/anti-PD-1 regimens.

scholarly journals Overview of Immune Checkpoint Inhibitors Therapy for Hepatocellular Carcinoma, and The ITA.LI.CA Cohort Derived Estimate of Amenability Rate to Immune Checkpoint Inhibitors in Clinical Practice

Cancers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1689 ◽  
Author(s):  
Edoardo Giannini ◽  
Andrea Aglitti ◽  
Mauro Borzio ◽  
Martina Gambato ◽  
Maria Guarino ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Clinical Practice ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Critical Evaluation ◽  
Real Life ◽  
Immune Checkpoint Blockade ◽  
Checkpoint Blockade ◽  
Immune Checkpoints

Despite progress in our understanding of the biology of hepatocellular carcinoma (HCC), this tumour remains difficult-to-cure for several reasons, starting from the particular disease environment where it arises—advanced chronic liver disease—to its heterogeneous clinical and biological behaviour. The advent, and good results, of immunotherapy for cancer called for the evaluation of its potential application also in HCC, where there is evidence of intra-hepatic immune response activation. Several studies advanced our knowledge of immune checkpoints expression in HCC, thus suggesting that immune checkpoint blockade may have a strong rationale even in the treatment of HCC. According to this background, initial studies with tremelimumab, a cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) inhibitor, and nivolumab, a programmed cell death protein 1 (PD-1) antibody, showed promising results, and further studies exploring the effects of other immune checkpoint inhibitors, alone or with other drugs, are currently underway. However, we are still far from the identification of the correct setting, and sequence, where these drugs might be used in clinical practice, and their actual applicability in real-life is unknown. This review focuses on HCC immunobiology and on the potential of immune checkpoint blockade therapy for this tumour, with a critical evaluation of the available trials on immune checkpoint blocking antibodies treatment for HCC. Moreover, it assesses the potential applicability of immune checkpoint inhibitors in the real-life setting, by analysing a large, multicentre cohort of Italian patients with HCC.

scholarly journals ATIM-20. A RETROSPECTIVE STUDY EVALUATING THE SAFETY AND SURVIVAL OF THE COMBINATION OF PD-1 IMMUNE CHECKPOINT BLOCKADE AND BEVACIZUMAB IN RECURRENT GLIOBLASTOMA

2019 ◽  
Vol 21 (Supplement_6) ◽  
pp. vi5-vi5
Author(s):  
Joshua Friedman ◽  
Adilia Hormigo
Keyword(s):  
Retrospective Study ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Recurrent Disease ◽  
Checkpoint Inhibitors ◽  
Immune Surveillance ◽  
Immune Checkpoint Blockade ◽  
Recurrent Glioblastoma ◽  
Grade 3 ◽  
Recurrent Gbm

Abstract INTRODUCTION Immune checkpoint inhibitors (ICI) have demonstrated clinical efficacy in a variety of cancers. It is known that cancer including glioblastoma (GBM) induces an immunosuppression. Bevacizumab by normalizing blood vessels in the tumor can facilitate immune surveillance and potentially improve the efficacy of ICI in GBM patients. We analyze GBM patients with recurrent disease treated with ICI and bevacizumab. METHODS We retrospectively review records of patients diagnosed with recurrent GBM treated at our institution with Pembrolizumab or Nivolumab and bevacizumab and evaluate for tolerance and outcomes. RESULTS Twenty-one patients, 12 men and 9 women with median age 62 (range 36–78) and KPS 70 (range 60–90) were treated with a median of 10 ICI cycles (range 4–29) and 5 of bevacizumab (range 0–21). A total of 8 patients (38%) had immune-related adverse events (IRAE): 3 grade 1, 3 grade 2 and 2 grade 3. A patient with pneumonitis required cessation of ICI. Median OS for the 21 patients was 22 months (range 6–41). The 7 patients that had MGMT detected in their tumors had a median OS of 27 months (range 23–41) compared to a survival of 21 months (range 6–24) for the 13 patients that had MGMT undetected. One had undetermined MGMT and her OS was 21 months. The median survival for all the patients from onset of ICI was 10 months (range 1–25) and 10 of them (47.6%) survived > 12 months. DISCUSSION The development of IRAE was common but self-limiting, allowing continuation of the treatment in all but one patient. The combination of ICI and bevacizumab increased survival. Our data needs to be interpreted with caution, as it is a retrospective analysis of a small group of patients. However, these results warrant prospective studies using the combination of ICI and bevacizumab to treat recurrent GBM.

Dermatologic adverse events with immune checkpoint blockade: Systematic review and meta-analysis.

2020 ◽  
Vol 38 (5_suppl) ◽  
pp. 84-84
Author(s):  
Kushal Naha ◽  
Lakshmi Manogna Chintalacheruvu ◽  
Donald C. Doll ◽  
Sowjanya Naha
Keyword(s):  
Adverse Effects ◽  
Adverse Events ◽  
Confidence Interval ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Immune Checkpoint Blockade ◽  
Checkpoint Blockade ◽  
Randomized Controlled ◽  
Dermatologic Adverse Events

84 Background: Immune checkpoint blockade is known to be associated with various dermatologic adverse events. However, these adverse effects have not been studied in a systematic manner. This is especially relevant considering the rapidly increasing number of immune checkpoint inhibitors that are now available. Methods: We searched for eligible studies in PubMed and Google scholar. We reviewed randomized controlled trials involving cancer patients treated with immune checkpoint inhibitors - PD1 inhibitors, PDL1 inhibitors and CTLA4 inhibitors and for dermatologic adverse effects. A total of 47 randomized controlled trials involving 11875 patients met eligibility criteria for our study. Results: Incidence rate of all grade dermatologic adverse effects was 40.6% (95% confidence interval [CI], 39.4-41.7%). Most common adverse effects included pruritus (17.3%) (95% confidence interval [CI] 16.6-18.1%), undifferentiated rash (15.1%) (95% confidence interval [CI] 14.4-15.9%), vitiligo (3.6%) (95% confidence interval [CI] 3.2-3.9%), maculopapular rash (2.3%) (95% confidence interval [CI] 2.1-2.6%), stomatitis (0.7%) (95% confidence interval [CI] 0.55-0.92%) and dry skin (0.7%) (95% confidence interval [CI] 0.5-0.8%). Less common adverse events include palmoplantar erythrodysesthesia, pemphigoid skin reactions, lichen planus and hyperhidrosis. Grade 3 and higher adverse effects were seen in 1.3% of patients (95% confidence interval [CI] 1.1-1.6%). Conclusions: A wide range of dermatologic adverse effects can be seen with immune checkpoint blockade. While the majority of these events are of grade 1-2, they can occasionally be severe and even life threatening. Patients receiving immune checkpoint blockade should be closely monitored for dermatologic adverse effects.

scholarly journals Therapeutic Implications of Tumor Microenvironment in Lung Cancer: Focus on Immune Checkpoint Blockade

2022 ◽  
Vol 12 ◽  
Author(s):  
Carlo Genova ◽  
Chiara Dellepiane ◽  
Paolo Carrega ◽  
Sara Sommariva ◽  
Guido Ferlazzo ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Tumor Microenvironment ◽  
Immune Checkpoint ◽  
Cytotoxic T Lymphocyte ◽  
Checkpoint Inhibitors ◽  
Suppressor Cells ◽  
Regulatory Elements ◽  
Immune Checkpoint Blockade ◽  
Therapeutic Implications ◽  
Investigational Agents

In the last decade, the treatment of non-small cell lung cancer (NSCLC) has been revolutionized by the introduction of immune checkpoint inhibitors (ICI) directed against programmed death protein 1 (PD-1) and its ligand (PD-L1), or cytotoxic T lymphocyte antigen 4 (CTLA-4). In spite of these improvements, some patients do not achieve any benefit from ICI, and inevitably develop resistance to therapy over time. Tumor microenvironment (TME) might influence response to immunotherapy due to its prominent role in the multiple interactions between neoplastic cells and the immune system. Studies investigating lung cancer from the perspective of TME pointed out a complex scenario where tumor angiogenesis, soluble factors, immune suppressive/regulatory elements and cells composing TME itself participate to tumor growth. In this review, we point out the current state of knowledge involving the relationship between tumor cells and the components of TME in NSCLC as well as their interactions with immunotherapy providing an update on novel predictors of benefit from currently employed ICI or new therapeutic targets of investigational agents. In first place, increasing evidence suggests that TME might represent a promising biomarker of sensitivity to ICI, based on the presence of immune-modulating cells, such as Treg, myeloid derived suppressor cells, and tumor associated macrophages, which are known to induce an immunosuppressive environment, poorly responsive to ICI. Consequently, multiple clinical studies have been designed to influence TME towards a pro-immunogenic state and subsequently improve the activity of ICI. Currently, the mostly employed approach relies on the association of “classic” ICI targeting PD-1/PD-L1 and novel agents directed on molecules, such as LAG-3 and TIM-3. To date, some trials have already shown promising results, while a multitude of prospective studies are ongoing, and their results might significantly influence the future approach to cancer immunotherapy.

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