- 著者
- Hirokazu KAWAGISHI
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.99, no.7, pp.191-197, 2023-07-31 (Released:2023-07-31)
- 参考文献数
- 18
The mushroom, Pleurocybella porrigens, is widely consumed in Japan; however, in autumn 2004, acute encephalopathy due to ingestion of the mushroom in a large group of patients was reported in Japan. We have continued working on the mushroom to clarify the mechanisms underlying the acute encephalopathy that occurred due to its consumption. The data collected to date have shown that three compounds, pleurocybelline (PC), a Pleurocybella porrigens lectin (PPL), and pleurocybellaziridine (PA), in the mushroom are potentially responsible for the onset of the disease; PC that exhibit lethal activity in mice and PPL formed a complex, and the complex of the two components exhibited proteolytic activity and disrupted the blood-brain barrier. Although PA was not isolated directly from the mushroom, the existence of this compound in the mushroom was predicted. The compound was chemically synthesized and its endogeneity in the mushroom was demonstrated. Furthermore, PA exhibited toxicity to oligodendrocytes.
- 著者
- Hirokazu KAWAGISHI
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.95, no.1, pp.29-38, 2019-01-11 (Released:2019-01-11)
- 参考文献数
- 29
- 被引用文献数
- 3 34
2-Azahypoxanthine (AHX, 1) and imidazole-4-carboxamide (ICA, 2) were isolated from a fairy-ring-forming fungus Lepista sordida. AHX was converted into a metabolite 2-aza-8-oxo-hypoxanthine (AOH, 3) in plants. It was found out that these three compounds, named as fairy chemicals (FCs), endogenously exist in plants and are biosynthesized via a new purine metabolic pathway. FCs provided tolerance to the plants against various stresses and regulated the growth of all the plants. In addition, FCs increased the yield of rice, wheat, and other crops in the greenhouse and/or field experiments.