Volume 120, Issue 4 pp. 761-768
Cancer Cell Biology

Emmprin in epithelioid sarcoma: Expression in tumor cell membrane and stimulation of MMP-2 production in tumor-associated fibroblasts

Kaori Koga

Kaori Koga

Department of Pathology, Fukuoka University School of medicine, Fukuoka, Japan

Department of Dermatology, Fukuoka University School of medicine, Fukuoka, Japan

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Kazuki Nabeshima

Corresponding Author

Kazuki Nabeshima

Department of Pathology, Fukuoka University School of medicine, Fukuoka, Japan

Fax: +81-92-861-7300.

Department of Pathology, Fukuoka University Hospital, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanSearch for more papers by this author
Mikiko Aoki

Mikiko Aoki

Department of Pathology, Fukuoka University School of medicine, Fukuoka, Japan

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Takehito Kawakami

Takehito Kawakami

Department of Pathology, Fukuoka University School of medicine, Fukuoka, Japan

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Makoto Hamasaki

Makoto Hamasaki

Department of Pathology, Fukuoka University School of medicine, Fukuoka, Japan

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Bryan P. Toole

Bryan P. Toole

Department of Cell Biology and Anatomy, Medical University of South Carolina, Charleston, SC

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Juichiro Nakayama

Juichiro Nakayama

Department of Dermatology, Fukuoka University School of medicine, Fukuoka, Japan

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Hiroshi Iwasaki

Hiroshi Iwasaki

Department of Pathology, Fukuoka University School of medicine, Fukuoka, Japan

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First published: 27 December 2006
Citations: 25

Abstract

Emmprin is a transmembrane glycoprotein on tumor cells that stimulates peritumoral fibroblasts to produce matrix metalloproteinases (MMPs). Emmprin and the induced MMPs play a crucial role in tumor progression, invasion and metastasis of human carcinomas (epithelial malignancies). However, only a few reports have addressed its role in soft tissue sarcomas. This study investigated the expression and role of emmprin in epithelioid sarcoma (ES). Immunoblot studies of 2 ES cell lines showed that they express emmprin, and co-culture of these ES cells with dermal fibroblasts resulted in upregulation of gelatinase A (MMP-2) in fibroblasts, as shown by zymography, immunoblotting and enzyme immunoassay. This stimulation was inhibited by an activity-blocking peptide against emmprin and by antiemmprin antibody. In addition, in vivo, immunohistochemical analysis of 5 ES patient cases demonstrated diffuse emmprin expression in ES cells and MMP-2 expression in both ES cells and peritumoral fibroblasts. The histopathological findings that peritumoral fibroblasts that were not in direct contact with emmprin-expressing ES cells exhibit upregulated MMP-2 prompted us to look for a soluble form of emmprin. Soluble full-length emmprin released from ES cells was detected in conditioned medium and shown to stimulate MMP-2 production by fibroblasts. In conclusion, emmprin is expressed in ES in both membrane and soluble forms and stimulates MMP-2 production via interactions with fibroblasts, which could play a role in ES cell stromal invasion and vascular involvement. © 2006 Wiley-Liss, Inc.

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