An Alpha-fetoprotein derived Peptide Suppresses Growth in Breast Cancer and Other Malignancies: A Review and Prospectus
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Abstract
Growth Inhibitory Peptide (GIP) is an alpha-fetoprotein (AFP) derived peptide found during human pregnancy, which gradually disappears following childbirth in both the woman and the newborn. Following a stress-induced conformational change in the AFP molecule, GIP is exposed on the protein surface from a concealed occult site on the unfolded full-length AFP. The exposed 34-amino acid GIP peptide then targets, blocks, and suppresses malignant growth in the mammalian body. In the present report, GIP has been demonstrated to inhibit cell growth in vitro in nine different types of cancers including breast, prostate, and ovarian among others. GIP can further assist in preventing blood clotting, arresting growth via the cytoplasmic growth cycle, suppressing tumor blood vessel angiogenesis, and inhibiting circulating cancer cell metastasis. In further studies, GIP has been reported to suppress cancer growth in 38 of 60 different cancer cell culture lines. The growth suppressed human breast cancer cell lines included MCF-7, T-47D, Bt-547, MDA-MB-231, MDA-MB-435, in addition to mouse mammary tumor implants and xenografts. Thus, GIP was found to suppress and inhibit cancer growth in both in vitro and in vivo preclinical studies.
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