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Establishment and characterization of two new rectal neuroendocrine cell carcinoma cell lines
Y Takahashi1, M Onda, N Tanaka
1First Department of Surgery, Nippon Medical School, Tokyo, Japan. yyr@mbe.sphere.ne.jp
Background:
Human colorectal neuroendocrine cell carcinoma (NEC) is a rare disease with a poor prognosis. The biological behavior of NEC remains poorly understood.
Materials And Methods:
We established two new NEC cell lines from a patient with rectal neuroendocrine carcinoma, NECS-P and NECS-L from the primary tumor and a liver metastasis, respectively. We investigated the biological differences between the two cell lines to study the mechanisms involved in liver metastasis.
Results:
There was no difference between NECS-P and NECS-L in the morphological, ultrastructural and immunohistochemical studies. After addition of TGF-beta(1), the doubling times of NECS-P were increased in a dose-dependent manner relative to untreated cells, whereas TGF-beta(1) had no effect on NECS-L. The attachment and chemotactic response of the two cell lines were not enhanced by TGF-beta(1). The invasive capacity and the production of matrix metalloproteinase-2 (MMP-2) were significantly increased only in NECS-L following the addition of TGF-beta(1). When anti-MMP-2 antibody was added to the medium with TGF-beta(1), NECS-L invasion was inhibited.
Conclusion:
It is considered that these differences are important to understand the mechanisms of liver metastasis of NEC.