Potent anti-tumor and prolonged survival effects of E. coli-derived non-glycosylated kringle domain of tissue-type plasminogen activator.

Abstract:

:The two-kringle domain of tissue-type plasminogen activator (TK1-2) has been identified as a novel angiogenesis inhibitor. In the previous study, purified Pichia-derived TK1-2 has been shown to suppress in vivo growth of human lung and colon cancer cells. Here, we demonstrate that E. coli-derived non-glycosylated TK1-2 suppresses tumor growth more potently than Pichia-derived TK1-2 and prolongs the survival of tumor bearing mice. The recombinant TK1-2 prepared through E. coli expression, His-tag affinity chromatography and in vitro refolding was injected intraperitoneally once daily into nude mice 7 days after subcutaneous implantation with PC14 lung cancer cells (n=10). Measurement of tumor volumes indicated that low-dose TK1-2 treatment (10 mg/kg) suppressed tumor growth by approximately 85.2% (p<0.01), while high-dose TK1-2 treatment (50 mg/kg) even more potently inhibited tumor growth (>93.8%) (p<0.005). Treatment of TK1-2 also prolonged the survival of tumor-bearing mice in a dose-dependent fashion. In an independent HCT116 xenograft model, E. coli-derived TK1-2 was more effective in suppressing tumor growth than Pichia-derived TK1-2. Immunohistochemical analysis of tumor tissue also revealed that the expression of VEGF, SMA-alpha, TNF-alpha and angiogenin was less positive in the E. coli-derived TK1-2-treated group than in the Pichia-derived TK1-2-treated group. These results suggest that E. coli-derived refolded, non-glycosylated TK1-2 can be used more effectively as an anti-cancer agent.

journal_name

Int J Oncol

authors

Kang BH,Shim BS,Lee SY,Lee SK,Hong YK,Joe YA

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

361-7

issue

2

eissn

1019-6439

issn

1791-2423

journal_volume

28

pub_type

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