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Author Spotlight: Investigating Angiogenesis Through Challenges and Innovations in Assay Development
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HMGA2 contributes to vascular development and sprouting angiogenesis by promoting IGFBP2 production
Jing Wang1, Yinghui Chen2, Zhaoxiang Zeng3
1Institute for Developmental and Regenerative Cardiovascular Medicine, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200092, China; Department of Pediatric Cardiovascular, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200092, China; Shanghai Children Medicine Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
Experimental Cell Research
|September 21, 2021
Summary
High mobility group AT-hook 2 (HMGA2) promotes central artery formation by regulating angiogenesis through Insulin-like growth factor-binding protein 2 (IGFBP2) induction. This study clarifies HMGA2
Area of Science:
- Vascular Biology
- Molecular Oncology
- Developmental Biology
Background:
- Angiogenesis is crucial for embryonic development, wound healing, and tumorigenesis.
- High mobility group AT-hook 2 (HMGA2) is implicated in cancer, but its role in angiogenesis is unclear.
- Understanding HMGA2's downstream targets in vascular development is essential.
Purpose of the Study:
- To elucidate the role of HMGA2 in angiogenesis and identify its downstream regulatory genes.
- To investigate the functional relationship between HMGA2 and Insulin-like growth factor-binding protein 2 (IGFBP2) in vascular development.
- To explore the clinical relevance of HMGA2 and IGFBP2 in vascular anomalies like hemangioma.
Main Methods:
- Zebrafish embryo model for studying central artery formation defects.
- RNA sequencing to identify HMGA2-regulated genes.
- In vitro assays using human umbilical vein endothelial cells (HUVECs) to assess migration, tube formation, and branching.
- Matrigel plug assay to evaluate angiogenesis in vivo.
- Chromatin immunoprecipitation (ChIP) assay to confirm direct binding of HMGA2 to the IGFBP2 promoter.
- Analysis of HMGA2 and IGFBP2 expression in hemangioma patient samples.
Main Results:
- HMGA2 knockdown in zebrafish caused central artery formation defects.
- HMGA2 deficiency led to downregulation of IGFBP2; IGFBP2 overexpression rescued vascular defects.
- HMGA2 knockdown impaired HUVEC migration, tube formation, and branching; IGFBP2 overexpression ameliorated these effects.
- HMGA2 directly binds to the IGFBP2 promoter and positively regulates its expression.
- Elevated HMGA2 and IGFBP2 mRNA levels were observed in hemangioma patients.
Conclusions:
- HMGA2 is a key regulator of angiogenesis and central artery formation.
- HMGA2 promotes angiogenesis by inducing IGFBP2 expression.
- The HMGA2-IGFBP2 axis plays a significant role in vascular development and may be implicated in hemangioma pathogenesis.
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