American Association for Cancer Research
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Suppl Fig2 from Agr2 Mediates Paracrine Effects on Stromal Fibroblasts That Promote Invasion by Gastric Signet-Ring Carcinoma Cells

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posted on 2023-03-30, 23:30 authored by Tadahiro Tsuji, Rika Satoyoshi, Namiko Aiba, Takanori Kubo, Kazuyoshi Yanagihara, Daichi Maeda, Akiteru Goto, Kazuo Ishikawa, Masakazu Yashiro, Masamitsu Tanaka

Suppl Fig2. Immunostaining of human gastric SRCC specimens.

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ARTICLE ABSTRACT

Agr2 is a disulfide isomerase residing in the endoplasmic reticulum (ER), which physiologically regulates protein folding and mediates resistance to ER stress. Agr2 is overexpressed in adenocarcinomas of various organs, where it participates in neoplastic transformation and metastasis, therefore acts as a pro-oncogenic protein. Besides its normal localization in the ER, Agr2 is also found in the serum and urine of cancer patients, although the physiological significance of extracellular Agr2 is poorly understood. In this study, we demonstrated that extracellular Agr2 can activate stromal fibroblasts and promote fibroblast-associated cancer invasion in gastric signet-ring cell carcinoma (SRCC), where Agr2 is highly expressed. Agr2 secreted from SRCC cells was incorporated by the surrounding gastric fibroblasts and promoted invasion by these cells. In turn, activated fibroblasts coordinated the invasive behavior of fibroblasts and cancer cells. Our findings suggested that Agr2 drives progression of gastric SRCC by exerting paracrine effects on fibroblasts in the tumor microenvironment, acting also to increase the growth and resistance of SRCC cells to oxidative and hypoxic stress as cell autonomous effects. Cancer Res; 75(2); 356–66. ©2014 AACR.

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