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Ohashi, M., Aizawa, S., Ooka, H., Ohsawa, T., Kaji, K., Kondo, H., Kobayashi, T., Noumura, T., Matsuo, M., Mitsui, Y., Murota, S., Yamamoto, K., Ito, H., Shimada, H. and Utakoji, T. (1980) A New Human Diploid Cell Strain, TIG-1, for the Research on Cellular Aging. Experimental Gerontology, 15, 121-133.
https://doi.org/10.1016/0531-5565(80)90083-2

has been cited by the following article:

• TITLE: High Concentration of Spermine Induces the Dedifferentiation of Somatic Cells into Pluripotent Stem Cells

  AUTHORS: Naofumi Shiomi

  KEYWORDS: Polyamine, Spermine, Pluripotent Stem Cells, Dedifferentiation, Cancer Stem Cells, Regenerative Medicine

  JOURNAL NAME: Journal of Biomedical Science and Engineering, Vol.12 No.2, February 21, 2019

  ABSTRACT: Cancer tissues contain cancer stem cells (CSCs), which play important roles in cancer metastasis. However, the mechanisms through which cancer cells dedifferentiate into stem cells have not yet been elucidated. In this study, the effects of high concentrations of polyamines produced in cancer cells on dedifferentiation were examined. The results showed that when normal human fibroblasts were cultured with high concentrations of spermine, the obtained polyamine-induced cells expressed alkaline phosphatase and marker proteins of pluripotent stem cells, although apoptosis occurred in most cells. In contrast, another polyamine-induced stem (PIS) cell line (Spe-2 PIS cells), obtained by culture in medium containing Rock, p53, and Bax inhibitors plus spermine, did not show signs of apoptosis. These Spe-2 PIS cells expressed marker proteins of pluripotent stem cells and differentiated into cardiomyocytes, brown adipocytes, and nerve cells. These results suggest that a high concentration of spermine, which often induces apoptosis in normal cells, has the capacity to dedifferentiate somatic cells into pluripotent stem cells and may be associated with the dedifferentiation of cancer cells, which continuously produce high concentrations of spermine. Moreover, the procedure to obtain Spe-2 PIS cells, which is simple and efficient, may have potential applications in regenerative medicine.