Abstract |
E- peptide of the pro-Insulin-like growth factor-I ( pro-IGF-I) is produced from pre- pro-IGF-I by proteolytic cleavage in the post-translational processing. Previous in vitro studies conducted in our laboratory showed that Ea4-peptide of rainbow trout (rt) pro-IGF-I or Eb- peptide of human (h) pro-IGF-I exhibited activities including induction of morphological differentiation, inhibition of anchorage-independent cell growth and suppression of invasion of several well established human cancer cell lines such as MDA-MB-231, HT-29, SK-N-F1, and HepG-2 (Chen et al. [2002] Gen Comp Endocrinol 126:342-351; Kuo and Chen [2002] Exp Cell Res 280:75-89). Seeding of aggressive human breast cancer cells, MDA-MB-231, on the chorioallantoic membrane (CAM) of 5 days old chicken embryos resulted in rapid growth and invasion of the cells and induction of blood vessel formation around the MDA-MB-231 cell mass in the chicken embryos. The invasion of MDA-MB-231 cells in the chicken embryos was further confirmed by immunocytochemistry. The rapid growth and invasion of MDA-MB-231 cells and the induction of blood vessel formation by MDA-MB-231 cells on chicken CAM are inhibited by treatment with a single or multiple doses of rtEa4- or hEb- peptide. Furthermore, a dose-dependent inhibition of angiogenesis by rtEa4- or hEb- peptide was also demonstrated by the chicken CAM assay. Results of microarray analysis of human gene chips (containing 9,500 unique cDNA clones) and confirmation by comparative real-time RT-PCR analysis showed that a group of genes related to cancer cell activities are up- or down-regulated in MDA-MB-231 cells transfected with a rtEa4-peptide gene. Together these results confirm the anti- tumor activity of rtEa4- and hEb- peptides, and further suggest that these peptides could be developed as therapeutics for treating human cancers.
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Authors | Maria J Chen, Pinwen Peter Chiou, Patrick Lin, Chun-Mean Lin, S Siri, Konan Peck, Thomas T Chen |
Journal | Journal of cellular biochemistry
(J Cell Biochem)
Vol. 101
Issue 5
Pg. 1316-27
(Aug 01 2007)
ISSN: 0730-2312 [Print] United States |
PMID | 17286280
(Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S.)
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Copyright | (c) 2007 Wiley-Liss, Inc. |
Chemical References |
- Peptides
- Protein Precursors
- Recombinant Proteins
- pro-insulin-like growth factor I
- Insulin-Like Growth Factor I
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Topics |
- Animals
- Breast Neoplasms
(blood supply, genetics, pathology)
- Cell Line, Tumor
- Cell Proliferation
(drug effects)
- Chick Embryo
- Chorioallantoic Membrane
(blood supply)
- Dose-Response Relationship, Drug
- Female
- Gene Expression Regulation, Neoplastic
(drug effects)
- Humans
- Insulin-Like Growth Factor I
(pharmacology, therapeutic use)
- Neoplasm Invasiveness
- Neovascularization, Pathologic
(drug therapy)
- Oncorhynchus mykiss
- Peptides
(pharmacology)
- Protein Precursors
(pharmacology, therapeutic use)
- Recombinant Proteins
(pharmacology)
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