Abstract
Objective and design
The age-associated increases in aseptic inflammation and necroptosis are closely related to the emergence of various age-associated diseases.
Methods
In this study, the role of HMGB1/TLR4-induced necroptosis in abdominal aortic aneurysm (AAA) formation was investigated. First, the levels of sterile inflammatory mediators (HMGB1, TLR4) and necroptosis markers were measured in the abdominal aortas of young and old C57BL/6JNifdc mice. We observed that sterile inflammatory mediators and necroptosis markers were greatly increased in the abdominal aortas of old mice. Then, angiotensin II (Ang II)-induced AAA model in APOE−/− mice was used in this study. Mice AAA models were treated with the RIP1 inhibitor necrostatin-1 (Nec-1) or the TLR4 inhibitor TAK-242, respectively.
Results
We found that HMGB1, TLR4, and necroptosis markers were elevated in old mice compared with those in young mice. Same elevation was also found in the development of AAA in APOE−/− mice. In addition, the necroptosis inhibitor Nec-1 alleviated Ang II-induced AAA development while downregulating the expression of HMGB1/TLR4. After blocking TLR4 with TAK-242, the expression of necroptosis markers decreased significantly, and the progression of AAA was also alleviated in APOE−/− mice.
Conclusions
Our results indicated that HMGB1/TLR4-mediated necroptosis enhances AAA development in the Ang II-induced AAA model in APOE−/− mice and that TLR4 might be a potential therapeutic target for AAA management.
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Data availability
The authors will provide the raw data of this study unreservedly.
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Funding
This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 81970400).
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SB and LY: contributed equally to this work and shared co-first authors. SB and LY: carried out the experiments and drafted the article. DZ and LL: collected and analyzed the data. TW: performed ultrasound examinations. HY: contributed to the conception and design of this study, executed article revision. All authors read and agreed with the final manuscript.
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All animal experimental procedures were agreed with Shandong Provincial Hospital’s Committee of Animal Protection and Use.
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Bian, S., Yang, L., Zhao, D. et al. HMGB1/TLR4 signaling pathway enhances abdominal aortic aneurysm progression in mice by upregulating necroptosis. Inflamm. Res. 72, 703–713 (2023). https://doi.org/10.1007/s00011-023-01694-3
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DOI: https://doi.org/10.1007/s00011-023-01694-3