TY - JOUR
T1 - Role of human tissue kallikrein in gastrointestinal stromal tumour invasion
AU - Dominek, P.
AU - Campagnolo, P.
AU - H-Zadeh, M.
AU - Kränkel, N.
AU - Chilosi, M.
AU - Sharman, J. A.
AU - Caporali, A.
AU - Mangialardi, G.
AU - Spinetti, G.
AU - Emanueli, C.
AU - Pignatelli, M.
AU - Madeddu, P.
N1 - Funding Information:
P Dominek was supported by a studentship of the Pathological Society of Great Britain and Ireland. We are thankful to Dr J Fletcher, Dr S Bauer and J Ketzer for providing cell lines GIST882 and GIST48.
PY - 2010/10/26
Y1 - 2010/10/26
N2 - Background: Human tissue kallikrein (hK1) generates vasodilator kinins from kininogen and promotes angiogenesis by kinin-dependent and kinin-independent mechanisms. Here, we investigate the expression and functional relevance of hK1 in human gastrointestinal stromal tumour (GIST). Methods: Vascularisation and hK1 expression of GIST samples were assessed by immunohistochemistry. In two GIST cell lines, hK1 expression was assessed by PCR, and hK1 protein levels and activity were measured by ELISA and an amidolytic assay, respectively. The effect of hK1 silencing, inhibition or overexpression on GIST cell proliferation, migration and paracrine induction of angiogenesis was studied. Finally, local and systemic levels of hK1 were assessed in mice injected with GIST cells. Results: Human tissue kallikrein was detected in 19 out of 22 human GIST samples. Moreover, GIST cells express and secrete active hK1. Titration of hK1 demonstrated its involvement in GIST invasive behaviour, but not proliferation. Furthermore, hK1 released by GIST cells promoted endothelial cell migration and network formation through kinin-dependent mechanisms. Gastrointestinal stromal tumour implantation in nude mice resulted in local and systemic hK1 expression proportional to tumour dimension.Conclusions:Human tissue kallikrein is produced and released by GIST and participates in tumour invasion. Further studies are needed to validate hK1 as a diagnostic biomarker and therapeutic target in GIST.
AB - Background: Human tissue kallikrein (hK1) generates vasodilator kinins from kininogen and promotes angiogenesis by kinin-dependent and kinin-independent mechanisms. Here, we investigate the expression and functional relevance of hK1 in human gastrointestinal stromal tumour (GIST). Methods: Vascularisation and hK1 expression of GIST samples were assessed by immunohistochemistry. In two GIST cell lines, hK1 expression was assessed by PCR, and hK1 protein levels and activity were measured by ELISA and an amidolytic assay, respectively. The effect of hK1 silencing, inhibition or overexpression on GIST cell proliferation, migration and paracrine induction of angiogenesis was studied. Finally, local and systemic levels of hK1 were assessed in mice injected with GIST cells. Results: Human tissue kallikrein was detected in 19 out of 22 human GIST samples. Moreover, GIST cells express and secrete active hK1. Titration of hK1 demonstrated its involvement in GIST invasive behaviour, but not proliferation. Furthermore, hK1 released by GIST cells promoted endothelial cell migration and network formation through kinin-dependent mechanisms. Gastrointestinal stromal tumour implantation in nude mice resulted in local and systemic hK1 expression proportional to tumour dimension.Conclusions:Human tissue kallikrein is produced and released by GIST and participates in tumour invasion. Further studies are needed to validate hK1 as a diagnostic biomarker and therapeutic target in GIST.
KW - GIST
KW - angiogenesis
KW - invasion
KW - kallikrein
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U2 - 10.1038/sj.bjc.6605906
DO - 10.1038/sj.bjc.6605906
M3 - Article
C2 - 20859288
AN - SCOPUS:78049285304
SN - 0007-0920
VL - 103
SP - 1422
EP - 1431
JO - British journal of cancer
JF - British journal of cancer
IS - 9
ER -