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Measurement of Pulse Propagation Velocity, Distensibility and Strain in an Abdominal Aortic Aneurysm Mouse Model
Published on: February 23, 2020
Sparcl1 mitigates abdominal aortic aneurysm through inhibiting lymphangiogenesis-mediated TLS formation
Mei-Hua Chen1, Yi-Jie Hua2, Yan Li3
1Institute of Metabolism and Regenerative Medicine, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Clinical Centre for Diabetes, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
None:
Vascular tissue-resident macrophages (VRMs) maintain immune balance in blood vessels, but their role in abdominal aortic aneurysm (AAA) development remains unclear. Here we demonstrated that a specific group of VRMs located in the adventitia marked by expression of Lyve1, protected against AAA by secreting the extracellular matrix protein Sparcl1 (Sc1). Deletion of Sc1 in VRMs promoted dysfunctional lymphangiogenesis and led to the formation of tertiary lymphoid structures (TLSs), thereby accelerating AAA progression. Mechanistically, the calcium-binding domain of Sc1 acted as a trap for the growth factor FGF2, inhibiting FGF2-mediated dysfunctional lymphangiogenesis and expression of genes associated with TLS formation. A therapeutic peptide derived from Sc1 (Spa17) mitigated AAA progression in several AAA models. Our findings reveal that VRM-derived Sc1 has a protective role in AAA and identify a potential therapeutic approach.
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