Amanita sphaerobulbosa

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Amanita sphaerobulbosa
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species: A. sphaerobulbosa
Binomial name
Amanita sphaerobulbosa
Hongo (1969)
Amanita sphaerobulbosa
View the Mycomorphbox template that generates the following list
Mycological characteristics
gills on hymenium

cap is convex

or flat
hymenium is free
stipe has a ring and volva
spore print is white
ecology is mycorrhizal
edibility: deadly

Amanita sphaerobulbosa, commonly known as the Asian abrupt-bulbed Lepidella, is a species of agaric fungus in the family Amanitaceae. First described by mycologist Tsuguo Hongo in 1969,[1] it is found in Southern Asia. The species was formerly consider synonymous with the North American lookalike Amanita abrupta, but that species has narrower spores, a persistent partial veil, and lacks the refractive contents found in the hyphae and inflated cells of A. sphaerobulbosa.[2]

The fruit bodies of Amanita sphaerobulbosa are poisonous, and ingestion damages the liver; the toxicity is thought to be largely due to a rare amino acid. Although not considered as toxic as its infamous relatives the death cap and the destroying angel, A. sphaerobulbosa is blamed for the deaths of two Japanese women in 1978. Poisoning symptoms included the abrupt appearance of violent vomiting, diarrhea and dehydration after a delay of 10–20 hours.

Habitat and distribution[edit]

The mushroom been collected in Korea,[3] and Japan.[4]

Toxicity[edit]

Ingestion of Amanita sphaerobulbosa fruit bodies is toxic to the liver.[5] Laboratory experiments have shown that mice that ingested A. sphaerobulbosa mushroom extracts developed cholera-like symptoms. A minimum single lethal dose of mushroom extract (equivalent to 4.5 grams of fruiting body per kilogram of mouse body weight) caused mice to become prostrate 6 hours after injection; shortly after the mice had diarrhea, then ultimately died between 24 and 48 hours after administration of the extract.[6] In Nagano, Japan in 1978, two women died from mushroom poisoning suspected to be caused by this species.[7] The symptoms were characterized by the abrupt appearance of violent vomiting, diarrhea and dehydration after a delay of 10–20 hours. Although not as toxic as the destroying angel (A. virosa) or the death cap (A. phalloides), A. sphaerobulbosa causes changes in liver function similar to these species. Effects include a decrease in blood sugar levels, depletion of stored carbohydrate reserves (liver glycogen), and an increase in transaminases.[8]

Bioactive compounds[edit]

Several novel non-protein amino acids have been isolated from Amanita sphaerobulbosa, including (2S,4Z)-2-amino-5-chloro-6-hydroxy-4-hexenoic acid; D,L-2-amino-4-pentynoic acid (0.257% w/w); and L-2-amino-4,5-hexadienoic acid (0.911% w/w). This last chemical is suspected to be largely responsible for the toxic effects of the mushroom; the latter two compounds have also been found in A. solitaria and A. pseudoporphyria.[7] The chemical 2-amino-4-pentynoic acid (also known as propargylglycine) inhibits enzymes involved in the metabolism of the amino acids methionine and cystathionine in the liver;[9] it was also shown to have mild inhibitory effects on the glycogenolysis metabolic pathway in rat liver cells.[10]

See also[edit]

References[edit]

  1. ^ Hongo T. (1969). "Notes on Japanese larger fungi (20)". Journal of Japanese Botany 44: 230–8. 
  2. ^ Tulloss RE. "Amanita sphaerobulbosa". Amanitaceae.org. Retrieved 2012-11-08. 
  3. ^ Kim Y-S, Seok S-J, Park Y-H, Cha D-Y, Min K-H, Yoo K-H. (1994). "Fungal flora of Mt. Chiak (I): Agaric fungi". Korean Journal of Mycology 22 (4): 410–20. 
  4. ^ Zhang L, Yang J, Zhuliang Y. (2004). "Molecular phylogeny of eastern Asian species of Amanita (Agaricales, Basidiomycota): taxonomic and biogeographic implications" (PDF). Fungal Diversity 17: 219–38. 
  5. ^ Kawaji A, Sone T, Natsuki R, Isobe M, Takabatake E, Yamaura Y. (1990). "In vitro toxicity test of poisonous mushroom extracts with isolated rat hepatocytes". Journal of Toxicological Sciences 15 (3): 145–56. doi:10.2131/jts.15.145. PMID 2243367. 
  6. ^ Yamaura Y, Maezawa H, Takabatake E, Hashimoto T. (1982). "Biochemical effects of poisonous mushroom suspected of causing cholera-like symptoms in mice". Journal of the Food Hygienic Society of Japan 23: 314. 
  7. ^ a b Yamaura Y, Fukuhara M, Takabatake E, Ito N, Hashimoto T. (1985). "Hepatotoxic action of a poisonous mushroom, Amanita abrupta in mice and its toxic component". Toxicology 38 (2): 161–73. doi:10.1016/0300-483X(86)90117-4. PMID 3945968. 
  8. ^ Tu AT. (1992). Handbook of Natural Toxins: Food Poisoning. New York, New York: Dekker. p. 217. ISBN 0-8247-8652-1. 
  9. ^ Awata S, Nakayama K, Kodama H. (1984). "Effects of D,L-propargylglycine on cystathionine metabolism in rats". Biochemistry International 8 (1): 171–9. PMID 6477595. 
  10. ^ Kawaji A, Yamauchi K, Fujii S, Natsuki R, Takabatake E, Yamaura Y. (1992). "Effects of mushroom toxins on glycogenolysis – comparison of toxicity of phalloidin, α-amanitin and DL-propargylglycine in isolated rat hepatocytes". Journal of Pharmacobio-Dynamics 15 (3): 107–12. doi:10.1248/bpb1978.15.107. PMID 1320679. 

External links[edit]