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Jiang Y, Li X, Liu Q, Lei G, Wu C, Chen L, Zhao Y, Hu Y, Xian H, Mao R. Apolipoprotein A-I Binding Protein Inhibits the Formation of Infantile Hemangioma through Cholesterol-Regulated Hypoxia-Inducible Factor 1α Activation. J Invest Dermatol 2024; 144:645-658.e7. [PMID: 37832842 DOI: 10.1016/j.jid.2023.07.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/11/2023] [Accepted: 07/12/2023] [Indexed: 10/15/2023]
Abstract
Infantile hemangioma (IH) is the most frequent vascular tumor of infancy with unclear pathogenesis; disordered angiogenesis is considered to be involved in its formation. Apolipoprotein A-I binding protein (AIBP)-also known as NAXE (NAD [P]HX epimerase)-a regulator of cholesterol metabolism, plays a critical role in the pathological angiogenesis of mammals. In this study, we found that AIBP had much lower expression levels in both tissues from patients with IH and hemangioma endothelial cells (HemECs) than in adjacent normal tissues and human dermal vascular endothelial cells, respectively. Knockout of NAXE by CRISPR-Cas9 in HemECs enhanced tube formation and migration, and NAXE overexpression impaired tube formation and migration of HemECs. Interestingly, AIBP suppressed the proliferation of HemECs in hypoxia. We then found that reduced expression of AIBP correlated with increased hypoxia-inducible factor 1α levels in tissues from patients with IH and HemECs. Further mechanistic investigation demonstrated that AIBP disrupted hypoxia-inducible factor 1α signaling through cholesterol metabolism under hypoxia. Notably, AIBP significantly inhibited the development of IH in immunodeficient mice. Furthermore, using the validated mouse endothelial cell (ie, EOMA cells) and Naxe-/- mouse models, we demonstrated that both endogenous AIBP from tumors and AIBP in the tumor microenvironment limit the formation of hemangioma. These findings suggested that AIBP was a player in the pathogenesis of IH and could be a potential pharmacological target for treating IH.
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Affiliation(s)
- Yongying Jiang
- Department of Pathophysiology, School of Medicine, Nantong University, Jiangsu, China
| | - Xingjuan Li
- Department of Pathophysiology, School of Medicine, Nantong University, Jiangsu, China
| | - Qin Liu
- Department of Pathophysiology, School of Medicine, Nantong University, Jiangsu, China
| | - Gongyun Lei
- Department of Pathophysiology, School of Medicine, Nantong University, Jiangsu, China
| | - Changyue Wu
- Department of Dermatology, Affiliated Hospital of Nantong University, Nantong University, Jiangsu, China
| | - Long Chen
- Department of Pediatric Surgery, Affiliated Hospital of Nantong University, Nantong University, Jiangsu, China
| | - Yinshuang Zhao
- Department of Pediatric Surgery, Affiliated Hospital of Nantong University, Nantong University, Jiangsu, China
| | - Yae Hu
- Department of Pathophysiology, School of Medicine, Nantong University, Jiangsu, China
| | - Hua Xian
- Department of Pediatric Surgery, Affiliated Hospital of Nantong University, Nantong University, Jiangsu, China
| | - Renfang Mao
- Department of Pathophysiology, School of Medicine, Nantong University, Jiangsu, China.
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Hermann A, Loewenbrück KF, Boldt Ä, Fiedler C, Maisel M, Kalucka J, Schwarz J, Breier G, Storch A. Lack of vascular endothelial growth factor receptor-2/Flk1 signaling does not affect substantia nigra development. Neurosci Lett 2013; 553:142-7. [PMID: 23994060 DOI: 10.1016/j.neulet.2013.08.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 07/29/2013] [Accepted: 08/11/2013] [Indexed: 01/09/2023]
Abstract
Oxygen tension is critical for proliferation of human and murine midbrain-derived neural precursor cells (mNPCs). Lack of hypoxia-inducible factor-1α (HIF1α) impairs midbrain dopaminergic neurogenesis which could be rescued by vascular endothelial growth factor (VEGF) via VEGFR-2 signaling. Here, we conditionally inactivated the VEGFR-2, encoded by the fetal liver kinase 1 (Flk1) gene, in murine NPCs to determine its role in proliferation and survival in vitro as well as survival of dopaminergic neurons in vivo. Flk1 conditional knock-out (Flk1 CKO) mice showed no general brain phenotype. There was no midbrain-specific impairment of NPC proliferation as seen in HIF1α CKO mice. In the substantia nigra (SN) of adult Flk1 CKO mice, nonbiased stereological cell counts revealed no reduction of TH-positive neurons of Flk1 CKO mice compared with control Cre/wt mice (in which the wild-type Flk1 allele is expressed in parallel with the Cre recombinase allele). In conclusion, VEGF receptor signaling seems not to be relevant to the development and survival of substantia nigra dopaminergic neurons within the hypoxia-HIF1α signaling pathway.
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Affiliation(s)
- Andreas Hermann
- Division of Neurodegenerative Diseases, Department of Neurology, Dresden University of Technology, Dresden, Germany; Center for Regenerative Therapies Dresden, Dresden University of Technology, Dresden, Germany; German Centre for Neurodegenerative Diseases (DZNE) Dresden, Dresden University of Technology, Dresden, Germany
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