Angiopoietin-like protein 4 (ANGPTL4) is induced by high glucose in retinal pigment epithelial cells and exhibits potent angiogenic activity on retinal endothelial cells

Hirotaka Yokouchi, Koki Eto, Wataru Nishimura, Norio Takeda, Yasushi Kaburagi, Shuichi Yamamoto, Kazuki Yasuda

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Purpose: Hyperglycaemia has been identified as major risk factor for diabetic retinopathy (DR). It is widely accepted that the progression of DR is mainly due to a local imbalance of pro- versus anti-angiogenic factors in the retina. In this study, we investigated whether retinal pigment epithelial (RPE) cells produced pro-angiogenic factors under high glucose (HG) conditions in vitro. Methods: Cultured human retinal endothelial (RE) cells were exposed to conditioned medium from retinal pigment epithelium cells (ARPE-19) grown in HG medium and assessed for tube formation. Based on the expression profiles of ARPE-19, we investigated whether ANGPTL4 was a major angiogenic factor released from ARPE-19 under HG conditions using cultured human RE cells as the test system for experiments with recombinant protein, conditioned medium from ARPE-19 and RNA interference (RNAi). Results: The conditioned medium from ARPE-19 cultured under HG conditions promoted tube formation of cultured human RE cells. GeneChip analysis showed that ANGPTL4 was one of the highest upregulated genes under HG conditions. In addition, recombinant ANGPTL4 promoted all of the elements of angiogenesis in human RE cells in vitro. The results of experiments using conditioned medium from ARPE-19 combined with RNAi demonstrated that ANGPTL4 was a major angiogenic factor released from ARPE-19 under HG conditions. Conclusions: ANGPTL4 was induced by high glucose in RPE cells and exhibited potent angiogenic activity on RE cells. Our results are unique and may potentially add a new candidate to the long list of molecules involved in diabetic retinopathy.

Original languageEnglish
JournalActa Ophthalmologica
Volume91
Issue number4
DOIs
Publication statusPublished - Jun 2013
Externally publishedYes

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Angiopoietins
Retinal Pigments
Endothelial Cells
Epithelial Cells
Angiogenesis Inducing Agents
Glucose
Conditioned Culture Medium
Diabetic Retinopathy
Proteins
RNA Interference
Retinal Pigment Epithelium
Recombinant Proteins
Hyperglycemia
Retina

Keywords

  • ANGPTL4
  • diabetic retinopathy
  • high glucose
  • retinal angiogenesis
  • retinal endothelial cell
  • retinal pigment epithelial cell

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Angiopoietin-like protein 4 (ANGPTL4) is induced by high glucose in retinal pigment epithelial cells and exhibits potent angiogenic activity on retinal endothelial cells. / Yokouchi, Hirotaka; Eto, Koki; Nishimura, Wataru; Takeda, Norio; Kaburagi, Yasushi; Yamamoto, Shuichi; Yasuda, Kazuki.

In: Acta Ophthalmologica, Vol. 91, No. 4, 06.2013.

Research output: Contribution to journalArticle

Yokouchi, Hirotaka ; Eto, Koki ; Nishimura, Wataru ; Takeda, Norio ; Kaburagi, Yasushi ; Yamamoto, Shuichi ; Yasuda, Kazuki. / Angiopoietin-like protein 4 (ANGPTL4) is induced by high glucose in retinal pigment epithelial cells and exhibits potent angiogenic activity on retinal endothelial cells. In: Acta Ophthalmologica. 2013 ; Vol. 91, No. 4.
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