scholarly journals Neutrophils Extracellular Traps Inhibition Improves PD-1 Blockade Immunotherapy in Colorectal Cancer

Cancers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 5333
Author(s):  
Hongji Zhang ◽  
Yu Wang ◽  
Amblessed Onuma ◽  
Jiayi He ◽  
Han Wang ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Tumor Microenvironment ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Critical Role ◽  
Dnase I ◽  
Neutrophil Extracellular Trap ◽  
Advanced Malignancy ◽  
Extracellular Traps

Immune checkpoint inhibitors can improve the prognosis of patients with advanced malignancy; however, only a small subset of advanced colorectal cancer patients in microsatellite-instability-high or mismatch-repair-deficient colorectal cancer can benefit from immunotherapy. Unfortunately, the mechanism behind this ineffectiveness is unclear. The tumor microenvironment plays a critical role in cancer immunity, and may contribute to the inhibition of immune checkpoint inhibitors and other novel immunotherapies in patients with advanced cancer. Herein, we demonstrate that the DNase I enzyme plays a pivotal role in the degradation of NETs, significantly dampening the resistance to anti-PD-1 blockade in a mouse colorectal cancer model by attenuating tumor growth. Remarkably, DNase I decreases tumor-associated neutrophils and the formation of MC38 tumor cell-induced neutrophil extracellular trap formation in vivo. Mechanistically, the inhibition of neutrophil extracellular traps with DNase I results in the reversal of anti-PD-1 blockade resistance through increasing CD8+ T cell infiltration and cytotoxicity. These findings signify a novel approach to targeting the tumor microenvironment using DNase I alone or in combination with immune checkpoint inhibitors.

scholarly journals The Role of m6A Epigenetic Modification in the Treatment of Colorectal Cancer Immune Checkpoint Inhibitors

2022 ◽  
Vol 12 ◽  
Author(s):  
Huan Tong ◽  
He Wei ◽  
Alhaji Osman Smith ◽  
Juan Huang
Keyword(s):  
Colorectal Cancer ◽  
Drug Resistance ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Epigenetic Modification ◽  
Advanced Malignancy ◽  
Tumor Drug Resistance ◽  
New Strategies

Tumor immunotherapy, one of the efficient therapies in cancers, has been called to the scientific community’s increasing attention lately. Among them, immune checkpoint inhibitors, providing entirely new modalities to treat cancer by leveraging the patient’s immune system. They are first-line treatments for varieties of advanced malignancy, such as melanoma, gastrointestinal tumor, esophageal cancer. Although immune checkpoint inhibitors (ICIs) treatment has been successful in different cancers, drug resistance and relapses are common, such as in colorectal cancer. Therefore, it is necessary to improve the efficacy of immune checkpoint therapy for cancer patients who do not respond or lowly response to current treatments. N6-methyladenosine (m6A), as a critical regulator of transcript expression, is the most frequently internal modification of mRNA in the human body. Recently, it has been proposed that m6A epigenetic modification is a potential driver of tumor drug resistance. In this report, we will briefly outline the relevant mechanisms, general treatment status of immune checkpoint inhibitors in colorectal cancer, how m6A epigenetic modifications regulate the response of ICIs in CRC and provide new strategies for overcoming the resistance of ICIs in CRC.

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

Autoimmune encephalitis associated with Ma2 antibodies and immune checkpoint inhibitor therapy

2020 ◽  
Vol 20 (3) ◽  
pp. 256-259 ◽  
Author(s):  
Shane Lyons ◽  
Ronan Joyce ◽  
Patrick Moynagh ◽  
Luke O'Donnell ◽  
Silive Blazkova ◽  
...  
Keyword(s):  
Adverse Events ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Checkpoint Inhibitors ◽  
Autoimmune Encephalitis ◽  
Advanced Malignancy ◽  
Temporal Lobes ◽  
Stage 4 ◽  
Fluid Attenuated Inversion Recovery ◽  
Checkpoint Inhibitor Therapy

Immune checkpoint inhibitors have transformed the treatment of advanced malignancy, while increasing the risk of immune-related adverse events. A 56-year-old woman who had received nivolumab for stage 4 renal cell carcinoma subsequently developed altered behaviour, memory deficits and worsening of previously stable epilepsy. MR scan of the brain showed bilateral FLAIR (fluid-attenuated inversion recovery) hyperintensity of the mesial temporal lobes, and there were anti-Ma2 antibodies in both serum and cerebrospinal fluid. She was treated with corticosteroids but developed further clinical relapses requiring immunoglobulin and rituximab. The immune-related adverse events relating to immune checkpoint inhibitors are an emerging challenge for the neurologist. Some cases are refractory and require serial immunosuppression.

scholarly journals Immune Checkpoint Inhibitors in pMMR Metastatic Colorectal Cancer: A Tough Challenge

Cancers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2317 ◽  
Author(s):  
Federica Marmorino ◽  
Alessandra Boccaccino ◽  
Marco Maria Germani ◽  
Alfredo Falcone ◽  
Chiara Cremolini
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Mismatch Repair ◽  
Immune Checkpoint ◽  
Immune Checkpoint Inhibitors ◽  
Dna Mismatch Repair ◽  
Checkpoint Inhibitors ◽  
Favorable Effect ◽  
Mutational Load ◽  
Dna Mismatch

The introduction of checkpoint inhibitors provided remarkable achievements in several solid tumors but only 5% of metastatic colorectal cancer (mCRC) patients, i.e., those with bearing microsatellite instable (MSI-high)/deficient DNA mismatch repair (dMMR) tumors, benefit from this approach. The favorable effect of immunotherapy in these patients has been postulated to be due to an increase in neoantigens due to their higher somatic mutational load, also associated with an abundant infiltration of immune cells in tumor microenvironment (TME). While in patients with dMMR tumors checkpoint inhibitors allow achieving durable response with dramatic survival improvement, current results in patients with microsatellite stable (MSS or MSI-low)/proficient DNA mismatch repair (pMMR) tumors are disappointing. These tumors show low mutational load and absence of “immune-competent” TME, and are intrinsically resistant to immune checkpoint inhibitors. Modifying the interplay among cancer cells, TME and host immune system is the aim of multiple lines of research in order to enhance the immunogenicity of pMMR mCRC, and exploit immunotherapy also in this field. Here, we focus on the rationale behind ongoing clinical trials aiming at extending the efficacy of immunotherapy beyond the MSI-high/dMMR subgroup with particular regard to academic no-profit studies.

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