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Morpholino antisense oligomer targeting human midkine: Its application for cancer therapy
Author(s) -
Takei Yoshifumi,
Kadomatsu Kenji,
Yuasa Kanako,
Sato Waichi,
Muramatsu Takashi
Publication year - 2004
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.20781
Subject(s) - morpholino , midkine , oligomer , antisense therapy , transfection , cancer research , chemistry , immunoprecipitation , microbiology and biotechnology , biology , growth factor , biochemistry , rna , apoptosis , gene knockdown , gene , receptor , locked nucleic acid , organic chemistry
Abstract Overexpression of a heparin‐binding growth factor, midkine (MK), has been observed in many malignancies, making it an attractive therapeutic target. We used morpholino antisense oligomers to downregulate human MK expression in human prostate (PC‐3) and colon carcinoma (SW620) cells, and determined the practical advantages of this anticancer therapeutic. Morpholino antisense oligomers directed against MK caused a dramatic and sequence‐specific decrease of the target protein level, resulting in the inhibition of growth and anchorage‐independent growth of the transfected cells. Furthermore, MK morpholino antisense oligomers exhibited a significant anticancer effect in the PC‐3‐ and SW620‐xenograft models. In comparison with phosphorothioate‐modified oligodeoxynucleotide, morpholino oligomers showed 2 major advantages, stability and non‐toxicity. MALDI‐TOF mass spectrometric analysis showed that morpholino antisense oligomers were completely stable in the presence of serum nuclease(s). Serological examinations demonstrated no toxicity of MK morpholino antisense oligomers. Our study indicates that inhibition of MK expression by morpholino antisense oligomer is a promising novel and safe therapeutic strategy for cancers. © 2004 Wiley‐Liss, Inc.