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  • Title: Tumor cell autocrine motility factor is the neuroleukin/phosphohexose isomerase polypeptide.
    Author: Watanabe H, Takehana K, Date M, Shinozaki T, Raz A.
    Journal: Cancer Res; 1996 Jul 01; 56(13):2960-3. PubMed ID: 8674049.
    Abstract:
    To date, the structure of the autocrine motility factor (AMF), a tumor-secreted cytokine which stimulates cell migration in vitro and metastasis in vivo, is unknown. Here, AMF secreted by Gc-4 PF murine fibrosarcoma into a protein-free conditioned media was isolated, purified, and microsequenced. The results demonstrate that AMF is the previously cloned cytokine and enzyme designated as neuroleukin, and phosphohexose isomerase (PHI), which has been independently implicated in cell motility, and to be a cancer progression marker. PHI catalyzes isomerization of glucose 6-phosphate to fructose 6-phosphate and is specific for both sugars. Murine AMF exhibits the enzymatic properties of PHI and rabbit heart PHI-stimulated mouse fibrosarcoma cells' motility similar to those of the endogenous AMF. Specific PHI inhibitors (carbohydrate phosphates) inhibited enzymatic activity and AMF-induced cell motility.
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