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Sci Rep. 2019 Jul 18;9(1):10447. doi: 10.1038/s41598-019-46909-y.

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

Yan H1,2, Hu Y1,2, Akk A1,2, Ye K1,2, Bacon J1,2, Pham CTN3,4,5.

Author information

1
John Cochran VA Medical Center, Saint Louis, Missouri, USA.
2
Department of Medicine, Division of Rheumatology, Washington University School of Medicine, Saint Louis, Missouri, USA.
3
John Cochran VA Medical Center, Saint Louis, Missouri, USA. cpham@wustl.edu.
4
Department of Medicine, Division of Rheumatology, Washington University School of Medicine, Saint Louis, Missouri, USA. cpham@wustl.edu.
5
Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, Missouri, USA. cpham@wustl.edu.

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-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, 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.

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