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Interleukin-12 and -23 blockade mitigates elastase-induced abdominal aortic aneurysm.

ABSTRACT: Macrophages play an important role in the inflammatory process that contributes to the development of abdominal aortic aneurysm (AAA). Studies of human and mouse AAA tissue reveal expanded populations of macrophages producing an abundance of pro-inflammatory cytokines, including TNF-?, IL-12p40 and high level of metalloprotease 9 (MMP-9) at the late stages of disease. Herein, we show that blockade of IL-12p40 in the early phase of aneurysm development suppresses macrophage expansion, inflammatory cytokine and MMP-9 production and mitigates AAA development. Since IL-12 and IL-23 are related cytokines that share the common p40 subunit, we also evaluate the effect of direct IL-23 blockade on the development of AAA. Specific IL-23p19 blockade prevents AAA progression with the same efficiency as IL-12p40 antagonism, suggesting that the efficacy of anti-IL-12p40 treatment may reflect IL-23 blockade. IL-12p40 and IL-23p19 are also abundantly expressed in human AAA tissue. Our findings have potential translational value since IL-12p40 and IL-23p19 antagonists already exist as FDA-approved therapeutics for various chronic inflammatory conditions.

SUBMITTER: Yan H

PROVIDER: S-EPMC6639297 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Interleukin-12 and -23 blockade mitigates elastase-induced abdominal aortic aneurysm.

Yan Huimin H Hu Ying Y Akk Antonina A Ye Karen K Bacon John J Pham Christine T N CTN

Scientific reports 20190718 1

Macrophages play an important role in the inflammatory process that contributes to the development of abdominal aortic aneurysm (AAA). Studies of human and mouse AAA tissue reveal expanded populations of macrophages producing an abundance of pro-inflammatory cytokines, including TNF-α, IL-12p40 and high level of metalloprotease 9 (MMP-9) at the late stages of disease. Herein, we show that blockade of IL-12p40 in the early phase of aneurysm development suppresses macrophage expansion, inflammator ...[more]

PMID: 31320700

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Project description:ObjectiveMurine models have proved instrumental in studying various aspects of abdominal aortic aneurysm (AAA), from identification of underlying pathophysiologic changes to the development of novel therapeutic strategies. In the current study, we describe a new model in which an elastase-treated donor aorta is transplanted to a recipient mouse and allowed to progress to aneurysm. We hypothesized that by transplanting an elastase-treated abdominal aorta of one genotype to a recipient mouse of a different genotype, one can differentiate pathophysiologic factors that are intrinsic to the aortic wall from those stemming from circulation and other organs.MethodsElastase-treated aorta was transplanted to the infrarenal abdominal aorta of recipient mice by end-to-side microsurgical anastomosis. Heat-inactivated elastase-treated aorta was used as a control. Syngeneic transplants were performed with use of 12-week-old C57BL/6 littermates. Transplant grafts were harvested from recipient mice on day 7 or day 14 after surgery. The aneurysm outcome was measured by aortic expansion, elastin degradation, proinflammatory cytokine expression, and inflammatory cell infiltration and compared with that produced with the established, conventional elastase infusion model.ResultsThe surgical technique success rate was 75.6%, and the 14-day survival rate was 51.1%. By day 14 after surgery, all of the elastase-treated transplanted abdominal aortas had dilated and progressed to AAAs, defined as 100% or more increase in the maximal external diameter compared with that measured before elastase perfusion, whereas none of the transplanted aortas pretreated with inactive elastase became aneurysmal (percentage increase in maximum aortic diameter: 159.36% ± 23.27%, transplanted elastase, vs 41.46% ± 9.34%, transplanted inactive elastase). Aneurysm parameters, including elastin degradation and infiltration of macrophages and T lymphocytes, were found to be identical to those observed in the conventional elastase model. Quantitative polymerase chain reaction analysis revealed similarly increased levels of proinflammatory cytokines (relative changes of mRNA in the conventional elastase model vs transplant model: tumor necrosis factor α, 1.71 ± 0.27 vs 2.93 ± 0.86; monocyte chemoattractant protein 1, 2.36 ± 0.58 vs 2.87 ± 0.51; chemokine (C-C motif) ligand 5, 3.37 ± 0.92 vs 3.46 ± 0.83; and interferon γ, 3.09 ± 0.83 vs 5.30 ± 1.69). Using green fluorescent protein transgenic mice as donors or recipients, we demonstrated that a small quantity of mononuclear leukocytes in the transplant grafts bared the genotype of the donors.ConclusionsTransplanted elastase-treated abdominal aorta could develop to aneurysm in recipient mice. This AAA transplant model can be used to examine how the microenvironment of a transplanted aneurysmal aorta may be altered by the contributions of the "global" environment of the recipient.

Dataset Information

Interleukin-12 and -23 blockade mitigates elastase-induced abdominal aortic aneurysm.

Publications

Interleukin-12 and -23 blockade mitigates elastase-induced abdominal aortic aneurysm.

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