ANGPT1

ANGPT1 Full Name

angiopoietin 1

ANGPT1 Introduction

ANGPT1 encodes angiopoietin-1, a secreted glycoprotein and the prototypical member of the angiopoietin family of vascular growth factors. It is broadly expressed across adult human tissues, with the highest transcript levels detected in adipose tissue and lung, and plays a singularly important role in establishing and maintaining vascular quiescence throughout the circulatory system. The canonical molecular function of ANGPT1 is its activation of the endothelial-specific receptor tyrosine kinase Tie2 (encoded by the TEK gene), a surface receptor predominantly expressed on vascular endothelial cells. Upon ANGPT1 binding, Tie2 undergoes dimerization and autophosphorylation, recruiting downstream signaling adaptors that activate the PI3K/Akt and ERK1/2 pathways. The collective output of these cascades is profoundly anti-inflammatory and pro-stabilizing: ANGPT1 signaling suppresses endothelial apoptosis, promotes orderly cell-cell junctions, inhibits unwanted endothelial cell migration, and critically, reduces vascular permeability — earning ANGPT1 the functional description of a "vascular sealant." This action is distinctly complementary to but temporally distinct from VEGF signaling, which drives early angiogenic sprouting, whereas ANGPT1/Tie2 governs later stages of vessel maturation, remodeling, and long-term maintenance. Genetic studies have established that heterozygous loss-of-function mutations in ANGPT1 cause hereditary angioedema type 5, an autosomal dominant condition featuring recurrent episodes of subcutaneous and submucosal edema that can involve the upper airway and gastrointestinal tract. Functional characterization of ANGPT1 variants associated with this condition revealed impaired protein multimerization and reduced binding affinity for Tie2, resulting in compromised endothelial barrier function. Beyond hereditary angioedema, altered ANGPT1 expression is implicated in a wide spectrum of vascular pathologies, including the progression of diabetic retinopathy, pulmonary arterial hypertension, systemic sclerosis, and the neovascular component of solid tumors, where restoring the ANGPT1/Tie2 signaling balance represents a rational therapeutic strategy.

Figure 1. Angiopoietin signaling at the TIE2 receptor. (Source: Hilbert T, et al. 2016)

Alternate Names for ANGPT1

ANGPT1; angiopoietin 1; AGP1; AGPT; ANG1; angiopoietin-1; ANG-1;

• 1. Gillen J, et al. Angiopoietin-1 and Angiopoietin-2 Inhibitors: Clinical Development. Curr Oncol Rep. 2019 Feb 26;21(3):22.
  2. Hilbert T, et al. Endothelial permeability following coronary artery bypass grafting: an observational study on the possible role of angiopoietin imbalance. Crit Care. 2016 Mar 6;20:51.