Open AccessGI24 enhances tumor invasiveness by regulating cell surface membrane‐type 1 matrix metalloproteinase
Author(s) -
Sakr Moustafa A.,
Takino Takahisa,
Domoto Takahiro,
Nakano Hiroshi,
Wong Richard W.,
Sasaki Motoko,
Nakanuma Yasuni,
Sato Hiroshi
Publication year - 2010
Publication title -
cancer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 1347-9032
DOI - 10.1111/j.1349-7006.2010.01675.x
Subject(s) - ht1080 , transfection , matrix metalloproteinase , extracellular matrix , fibrosarcoma , biology , microbiology and biotechnology , cell culture , cell , metalloproteinase , small interfering rna , tissue inhibitor of metalloproteinase , cell migration , cancer research , cell growth , hek 293 cells , chemistry , biochemistry , genetics
GI24, an immunoglobulin superfamily member, has been cloned from a placenta cDNA library as a gene product that promoted activation of matrix metalloproteinase (MMP)‐2 mediated by membrane type (MT) 1–MMP. Co‐expression of GI24 with MT1‐MMP in HEK293T cells increased the cell‐surface level of MT1‐MMP concomitant with the cleavage of the GI24 at the juxtamembrane site to shed the extracellular domain. HT1080 fibrosarcoma cells stably transfected with the GI24 gene expressed a higher level of MT1‐MMP and showed more invasive ability in collagen gel than the control cells. GI24 was cleaved in HT1080 cells, which was blocked by the administration of MMP inhibitor BB94 or transfection of small interfering RNA (siRNA) targeting MT1‐MMP. GI24 expression is relatively high in some squamous carcinoma and hepatocarcinoma cell lines. Transfection of siRNA for GI24 into oral squamous carcinoma‐derived HSC‐4 cells, which express GI24 and MT1‐MMP genes reduced the expression of not only GI24 but also MT1‐MMP, and attenuated invasive growth in the collagen matrix. These results suggest that GI24 contributes to tumor‐invasive growth in the collagen matrix by augmenting cell surface MT1‐MMP. ( Cancer Sci 2010; 101: 2368–2374)