VEGF expression is regulated by HIF-1α and ARNT in 3D KYSE-70, esophageal cancer cell spheroids.

Abstract:

:In 3D cultured cell systems, the cells form 3D spheroids that mimic cancer cell spheroids in vivo. Cancer cells form cell spheroids as they grow. The in vivo spheroids do not contain a vascular network; therefore, oxygen and nutrition supplies are insufficient. Specifically, the cells in the core region of the cluster are exposed to higher stress levels than the cells in the outer spheroid layer. As a result, the cells in the spheroid are exposed to low nutrition and hypoxia conditions. To overcome these shortages, angiogenesis is induced in cancer spheroids in vivo. Vascular endothelial growth factor (VEGF) is an important molecule involved in angiogenesis. VEGF is secreted by cancer cells in vivo in response to stress conditions such as hypoxia. VEGF expression in cancer cells is mediated by hypoxia-inducible factor 1α (HIF1α), which accumulates in cancer cells during hypoxia. In this report, we show that VEGF expression is regulated by HIF1α and that VEGF is secreted to the outside of the spheroid in vitro. Several investigators have reported that HIF1α forms a protein-protein complex with aryl hydrocarbon receptor translocator (ARNT). We report here that not only HIF1α but also ARNT regulates VEGF expression in 3D cancer spheroids. Our results suggest the utility of the in vitro 3D cancer spheroid model for investigating angiogenesis in cancerous tissues.

journal_name

Cell Biol Int

authors

Terashima J,Sampei S,Iidzuka M,Ohsakama A,Tachikawa C,Satoh J,Kudo K,Habano W,Ozawa S

doi

10.1002/cbin.10656

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

1187-1194

issue

11

eissn

1065-6995

issn

1095-8355

journal_volume

40

pub_type

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