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01.01.2014 | Original Article—Alimentary Tract | Ausgabe 1/2014

Journal of Gastroenterology 1/2014

C-ERC/mesothelin provokes lymphatic invasion of colorectal adenocarcinoma

Zeitschrift:
Journal of Gastroenterology > Ausgabe 1/2014
Autoren:
Futoshi Kawamata, Shigenori Homma, Hirofumi Kamachi, Takahiro Einama, Yasutaka Kato, Masumi Tsuda, Shinya Tanaka, Masahiro Maeda, Kazunori Kajino, Okio Hino, Norihiko Takahashi, Toshiya Kamiyama, Hiroshi Nishihara, Akinobu Taketomi, Satoru Todo
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s00535-013-0773-6) contains supplementary material, which is available to authorized users.

Abstract

Background

Lymph node metastasis is a key event of colorectal cancer (CRC) progression. Mesothelin is expressed in various types of malignant tumor and associated with an unfavorable prognosis. The full-length mesothelin (Full-ERC) is cleaved by protease into membrane-bound C-ERC/mesothelin and N-ERC/mesothelin which is secreted into the blood. The aim of this study was to examine the biological role of mesothelin in CRC by clinicopathological analysis and in vitro lymphatic invasion assay.

Methods

Ninety-one cases of CRC specimens were immunohistochemically examined and the localization of mesothelin in luminal membrane and/or cytoplasm was also evaluated. Lymphatic invasion assay was also performed using the human CRC cell line, WiDr, which was transfected with Full-, N- and C-ERC/mesothelin expression plasmids (Full-WiDr, N-WiDr and C-WiDr).

Results

Immunohistochemically, “luminal membrane positive” of mesothelin was identified in 37.4 %, and correlated with lymphatic permeation and lymph node metastasis, but not with patients’ prognosis. Interestingly, among the patients with lymph node metastasis (N = 38), “luminal membrane positive” of mesothelin significantly correlated with unfavorable patients’ outcome. In addition, lymphatic invasion assay revealed that Full-WiDr and C-WiDr more significantly invaded human lymphatic endothelial cells than the Mock-WiDr (P < 0.01).

Conclusion

The luminal membrane expression of mesothelin was associated with unfavorable prognosis of CRC patients with lymph node metastasis. Moreover, this is the first report to prove the biological function of C-ERC/mesothelin associated with lymphatic invasion of cancer in vitro.

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Zusatzmaterial
Supplemental Figure 1. Scheme of lymphatic invasion and adhesion assay. (a): Modified transwell invasion assays. 5 x 104 of GFP-expressing Full-WiDr, N-WiDr, C-WiDr or Mock-WiDr were loaded on the top of the upper side of transwell inserts which were covered with a confluent monolayer of hLEC, and invaded cells were counted on the bottom side of the inserts. (b): Modified adhesion assays. 1 x 105 of hLEC were plated on a 12-well dish and incubated for 3 days. After confirmation of hLEC in confluence and monolayer by microscope, 1 x 105 of GFP-expressing Full-WiDr, N-WiDr, C-WiDr or Mock-WiDr were resuspended and plated on the cell layer of hLEC. After the incubation at 37°C for 30 min, non-adherent or loosely attached cells were removed by gently washing the wells twice with PBS. The attached GFP-expressing cells (Full-WiDr, N-WiDr, C-WiDr and Mock-WiDr) on hLEC were counted using a fluorescence microscope. hLEC: human lymphatic endothelial cells (TIFF 102 kb)
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Supplemental Figure 2. Expression of mesothelin and patients’ prognosis (a, c): “High-level expression” and “cytoplasmic expression” of mesothelin were not correlated with total patients’ prognosis (N = 91, P = 0.26, P = 0.31). (b, d): Among the patients with lymph node metastasis (N = 38), “high-level expression” and “cytoplasmic expression” of mesothelin were not correlated with patients’ prognosis (P = 0.73, P = 0.89) (TIFF 75 kb)
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Supplemental Table 1 (DOCX 24 kb)
535_2013_773_MOESM3_ESM.docx
Supplemental Table 2 (DOCX 16 kb)
535_2013_773_MOESM4_ESM.docx
Literatur
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