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Physiological functions of solanaceous and tomato steroidal glycosides

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Abstract

Solanaceous plants are widely distributed. They are used as food and in folk medicine. Our studies focused on these plants, starting with Solanum lyratum and S. nigrum, which are used as anti-cancer and anti-herpes agents. Extensive investigations in 45 Solanum plant species revealed that a considerable amount of glycosides such as spirosolane, solanidane, spirostane and furostane is in these plants, and some of the isolated glycosides showed strong anti-proliferative activity against various cancer cell lines and anti-herpes activity. Furthermore, we have discovered a few new hypothetical biosynthetic routes in which the pathways for the biosynthesis of 16-acyl-pregnane and pregnane glycosides were the most interesting. The occurrence of these pregnane compounds indicates that they might be internally biosynthesized in the plant from furostanol glycosides by a reaction that is similar to Marker degradation. Furthermore, this may imply that the administration of steroidal glycosides may result in their metabolization into pregnane derivatives possessing various activities. In order to perform metabolic experiments using the steroidal glycosides, we recently isolated tomato glycosides from ripe tomato fruits for the first time. For this experiment, we examined the metabolites in urine obtained from persons that consumed tomatoes. We obtained androstane derivatives that were probably metabolized via pregnane derivatives from tomato glycoside. Hence, when a steroidal glycoside is administered, it may be metabolized into a type of steroidal hormone with various physiological activities.

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Authors and Affiliations

  1. Faculty of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto, 862-0973, Japan

    Toshihiro Nohara, Tsuyoshi Ikeda, Yukio Fujiwara, Sayaka Matsushita & Eishin Noguchi

  2. Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Kumamoto, 860-0082, Japan

    Hitoshi Yoshimitsu

  3. School of Agriculture, Kyushu Tokai University, 5435 Choyo, Aso, Kumamoto, 869-1404, Japan

    Masateru Ono

Authors
  1. Toshihiro Nohara
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  2. Tsuyoshi Ikeda
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  3. Yukio Fujiwara
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  4. Sayaka Matsushita
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  5. Eishin Noguchi
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  6. Hitoshi Yoshimitsu
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  7. Masateru Ono
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Correspondence to Toshihiro Nohara.

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Nohara, T., Ikeda, T., Fujiwara, Y. et al. Physiological functions of solanaceous and tomato steroidal glycosides. J Nat Med 61, 1–13 (2007). https://doi.org/10.1007/s11418-006-0021-y

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  • DOI: https://doi.org/10.1007/s11418-006-0021-y

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