Combination Therapy with a TLR7 Agonist and a BRD4 Inhibitor Suppresses Tumor Growth via Enhanced Immunomodulation

JQ-1 is a typical BRD4 inhibitor with the ability to directly fight tumor cells and evoke antitumor immunity via reducing the expression of PD-L1. However, problems arise with the development of JQ-1 in clinical trials, such as marked lymphoid and hematopoietic toxicity, leading to the investigation...

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Veröffentlicht in:International journal of molecular sciences 2024-01, Vol.25 (1), p.663
Hauptverfasser: Liu, Yong-Si, Wang, Jia-Xin, Jin, Guang-Yi, Hu, Ming-Hao, Wang, Xiao-Dong
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Wang, Jia-Xin
Jin, Guang-Yi
Hu, Ming-Hao
Wang, Xiao-Dong
description JQ-1 is a typical BRD4 inhibitor with the ability to directly fight tumor cells and evoke antitumor immunity via reducing the expression of PD-L1. However, problems arise with the development of JQ-1 in clinical trials, such as marked lymphoid and hematopoietic toxicity, leading to the investigation of combination therapy. SZU-101 is a TLR7 agonist designed and synthesized by our group with potent immunostimulatory activity. Therefore, we hypothesized that combination therapy of SZU-101 and JQ-1 would target innate immunity and adaptive immunity simultaneously, to achieve a better antitumor efficacy than monotherapy. In this study, the repressive effects of the combination administration on tumor growth and metastasis were demonstrated in both murine breast cancer and melanoma models. In 4T1 tumor-bearing mice, i.t. treatment with SZU-101 in combination with i.p. treatment with JQ-1 suppressed the growth of tumors at both injected and uninjected sites. Combination therapy increased M1/M2 ratio in TAMs, decreased PD-L1 expression and promoted the recruitment of activated CD8 T cells in the TME. In summary, the improved therapeutic efficacy of the novel combination therapy appears to be feasible for the treatment of a diversity of cancers.
doi_str_mv 10.3390/ijms25010663
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subjects Adaptive immunity
Adenine - analogs & derivatives
Adjuvants, Immunologic
Animals
Apoptosis
B cells
B7-H1 Antigen
Breast cancer
Bromodomain Containing Proteins - antagonists & inhibitors
Cancer
Cancer therapies
Care and treatment
CD8-Positive T-Lymphocytes
Cell death
Combination therapy
Cytokines
Drug dosages
Flow cytometry
Investigations
Ligands
Lymphocytes
Macrophages
Mediation
Melanoma
Mice
Nuclear Proteins
Proteins
Succinates
T cells
Toll-Like Receptor 7 - agonists
Transcription Factors
Tumors
title Combination Therapy with a TLR7 Agonist and a BRD4 Inhibitor Suppresses Tumor Growth via Enhanced Immunomodulation
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