Cited by 146Cancer Immunotherapy and BiomarkersPARP inhibition in cancer therapyImmunotherapy and Immune Responses

The DOI matches its Crossref record; 130 of the 130 references it cites were found in a registry or an index.

Prospects for combining immune checkpoint blockade with PARP inhibition

Open access
Li, Anping, Yi, Ming, Qin, Shuang, Chu, Qian, Luo, Suxia, Wu, Kongming·2019·Journal of Hematology & Oncology

Abstract

The immunogenicity of a cancer cell is derived from accumulated somatic mutations. However, on the contrary to increased immunogenicity, anti-cancer immune response tends to be feeble. This impaired anti-cancer immunity could be attributed to multiple factors including loss of immunodominant epitopes, downregulation of major histocompatibility complex, and immunosuppressive microenvironment, as well as aberrant negative co-stimulatory signals. Immune checkpoint inhibitors block negative co-stimulatory signals such as programmed cell death-1 and cytotoxic T-lymphocyte-associated protein 4, ultimately reactivating anti-cancer immunity. Immune checkpoint inhibitors elicit potent anti-cancer effect and have been approved for multiple cancers. Nevertheless, there still are significant potential improvements for the applications of checkpoint inhibitor, especially considering frequent resistance. Recent studies demonstrated that additional PARP inhibition could alleviate resistance and enhance efficacy of immune checkpoint blockade therapy via promoting cross-presentation and modifying immune microenvironment. We proposed that PARP inhibitors could enhance the priming and tumor-killing activities of T cell, boost the whole cancer-immunity cycle, and thereby improve the response to immune checkpoint blockade. In this review, we focused the latest understanding of the effect of PARP inhibitors on anti-cancer immunity and PARP inhibitors combining immune checkpoint blockade therapy. Moreover, we summarized the preclinical and clinical evidence and discussed the feasibility of this combination therapy in future clinical practice.

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Crossref · 10.1186/s13045-019-0784-8

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Figures

Fig. 1 DNA single-strand break and double-strand break repair pathways. a PARP catalytic cycle and PARP inhibitor. PARP is a core DNA damage sensor in DDR, which binds to damaged DNA lesions, catalyzes the generation of negatively charged poly (ADP-ribose) chains, remodels the structures of damaged chromatin, and recruits DNA repair-related protein complex. Then, PARP is dissociated from DNA damage site by auto-PARylation. PARPi could interfere with the interaction between PARP and its cofactor (β-NAD), inhibit PARylation activity, and trap PARP on damaged DNA chain. b Double-strand break repair pathways. In normal cells, when both HR and NHEJ pathways are available in G2/M stage, HR pathway is preferentially adopted to repair DSB. HR is an effective repair approach with high fidelity which uses the sister copy of damaged sites as the template. However, for some cancer cells with HR deficiency such as BRCA1/2 mutations, NHEJ pathway is utilized for DSB repair. NHEJ is an error-prone repair pathway with low-fidelity which could induce unsustainable DNA damages (e.g., chromosomal rearrangements and mutations) and eventual cell death. β-NAD, β-nicotinamide adenine dinucleotide; DDR, DNA damage response; NHEJ, nonhomologous end joining; HR, homologous recombination; SSB, single-strand break; DSB, double-strand break
Fig. 1 DNA single-strand break and double-strand break repair pathways. a PARP catalytic cycle and PARP inhibitor. PARP is a core DNA damage sensor in DDR, which binds to damaged DNA lesions, catalyzes the generation of negatively charged poly (ADP-ribose) chains, remodels the structures of damaged chromatin, and recruits DNA repair-related protein complex. Then, PARP is dissociated from DNA damage site by auto-PARylation. PARPi could interfere with the interaction between PARP and its cofactor (β-NAD), inhibit PARylation activity, and trap PARP on damaged DNA chain. b Double-strand break repair pathways. In normal cells, when both HR and NHEJ pathways are available in G2/M stage, HR pathway is preferentially adopted to repair DSB. HR is an effective repair approach with high fidelity which uses the sister copy of damaged sites as the template. However, for some cancer cells with HR deficiency such as BRCA1/2 mutations, NHEJ pathway is utilized for DSB repair. NHEJ is an error-prone repair pathway with low-fidelity which could induce unsustainable DNA damages (e.g., chromosomal rearrangements and mutations) and eventual cell death. β-NAD, β-nicotinamide adenine dinucleotide; DDR, DNA damage response; NHEJ, nonhomologous end joining; HR, homologous recombination; SSB, single-strand break; DSB, double-strand breakCC BY · PubMed Central
Fig. 2 The cross-talk between DNA damage and immune response. Following the stimulation of cytoplasmic dsDNA, cGAS is activated and catalyzes the generation of cyclic-dinucleotide. CDN is a second messenger which promotes the conformational change of STING. Active STING mainly initiates the downstream TBK1-IRF3-Type I IFN pathway. Besides, STING could activate the NF-κB pathway which cooperates with IRF3 to upregulate the generation of type I IFN. Type I IFN has a substantial influence on systemic immune response and regulates multiple components in anti-cancer immunity. Moreover, PARPi treatment-induced double-strand break could upregulate PD-L1 expression by augmented anti-cancer immunity or ATM-ATR-Chk1 pathway. Lastly, after receiving PARPi treatment, accumulated chromosome rearrangements generate plenty of neoantigens and elevate the immunogenicity of tumor. DSB, double-strand break; STING, stimulator of interferon genes; cGAS cyclic GMP-AMP synthase; TMB, tumor mutation burden
Fig. 2 The cross-talk between DNA damage and immune response. Following the stimulation of cytoplasmic dsDNA, cGAS is activated and catalyzes the generation of cyclic-dinucleotide. CDN is a second messenger which promotes the conformational change of STING. Active STING mainly initiates the downstream TBK1-IRF3-Type I IFN pathway. Besides, STING could activate the NF-κB pathway which cooperates with IRF3 to upregulate the generation of type I IFN. Type I IFN has a substantial influence on systemic immune response and regulates multiple components in anti-cancer immunity. Moreover, PARPi treatment-induced double-strand break could upregulate PD-L1 expression by augmented anti-cancer immunity or ATM-ATR-Chk1 pathway. Lastly, after receiving PARPi treatment, accumulated chromosome rearrangements generate plenty of neoantigens and elevate the immunogenicity of tumor. DSB, double-strand break; STING, stimulator of interferon genes; cGAS cyclic GMP-AMP synthase; TMB, tumor mutation burdenCC BY · PubMed Central

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Metadata

Authors
Li, A., Yi, M., Qin, S., Chu, Q., Luo, S., & Wu, K.
Affiliations
  • Zhengzhou University (CN)
  • Tongji Hospital (CN)
Corresponding author
  • Luo, Suxia
  • Wu, Kongming
Venue
Journal of Hematology & Oncology
Published
2019-09-14
Volume
12
Issue
1
Pages
98-98
ISSN
1756-8722 (ISSN-L)
OpenAlex
W2972535107
Cited by
143
References
130
Citations by year
2026: 10 · 2025: 14 · 2024: 14 · 2023: 16 · 2022: 21 · 2021: 36 · 2020: 30 · 2019: 2
FWCI
2.17
Type
journal article
Language
en
Open access
Locations
  • Journal of Hematology & Oncology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (81874120, 81572608, 81672984)
  • Wuhan Municipal Science and Technology Bureau (2017060201010170)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Health Sciences › Medicine › Oncology › PARP inhibition in cancer therapy
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
Keywords
immune checkpoint blockade, PARP inhibitors, combination therapy, cancer immunotherapy, tumor immune microenvironment, PD-1, CTLA-4, immunosuppression, tumor immunogenicity, T cell priming, cross-presentation, drug resistance, cancer-immunity cycle
MeSH terms
Poly(ADP-ribose) Polymerase Inhibitors, Antineoplastic Agents, Humans, Immunotherapy, Poly(ADP-ribose) Polymerases

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