Overexpression in colorectal carcinoma of two lysosomal enzymes, CLN2 and CLN1, involved in neuronal ceroid lipofuscinosis.

Abstract:

BACKGROUND:Lysosomal proteases are implicated in cancer progression and metastasis. In the current study, using subtraction cloning for genes that are differentially expressed in metastasis, the authors isolated a clone encoding ceroid lipofuscinosis, neuronal 2 (CLN2), which is a lysosomal serine protease defective in neuronal ceroid lipofuscinosis (NCL). Increased CLN2 activity has been reported in breast carcinoma and the antiapoptotic effect of another causative gene of NCL, ceroid lipofuscinosis, neuronal 1 (CLN1), is known. METHODS:The mRNA levels of CLN2, CLN1, and cathepsins B, D, H, and L were investigated in colorectal carcinoma patients with different clinical stages using real-time quantitative reverse transcriptase polymerase chain reaction. A polyclonal antibody was raised against a recombinant CLN2 protein for immunoblotting and immunohistochemistry. RESULTS:The mRNA levels of CLN1 and cathepsins B, D, and L were significantly higher in metastatic lesions than in primary tumors. In the primary tumors, mRNA expressions of CLN2 and cathepsin D were associated with advanced clinical stages (P < .015 and P < .031, respectively). Among the lysosomal enzymes examined, only the mRNA expression of CLN2 in both the primary tumors of all patients and the pT3 tumors was correlated with the presence of liver metastases (P < .0049 and P < .029, respectively). The polyclonal antibody prepared in the current study demonstrated CLN2 overexpression by immunoblotting and immunohistochemistry. CONCLUSIONS:The results indicate that there is a close correlation between CLN2 and CLN1 expression and colorectal carcinoma progression and metastasis and suggest that they may be potential molecular targets.

journal_name

Cancer

journal_title

Cancer

authors

Tsukamoto T,Iida J,Dobashi Y,Furukawa T,Konishi F

doi

10.1002/cncr.21764

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

1489-97

issue

7

eissn

0008-543X

issn

1097-0142

journal_volume

106

pub_type

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