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Phytotoxicity associated to microcystins: a review / Fitotocixidade associada às microcistinas: uma revisão
Bittencourt-Oliveira, MC; Hereman, TC; Cordeiro-Araújo, MK; Macedo-Silva, I; Dias, CT; Sasaki, FFC; Moura, AN.
  • Bittencourt-Oliveira, MC; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
  • Hereman, TC; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
  • Cordeiro-Araújo, MK; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
  • Macedo-Silva, I; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
  • Dias, CT; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
  • Sasaki, FFC; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
  • Moura, AN; University of São Paulo – USP. Luiz de Queiroz College of Agriculture. Department of Biological Sciences. Piracicaba. BR
Braz. j. biol ; 74(4): 753-760, 11/2014.
Article in English | LILACS | ID: lil-732297
ABSTRACT
Microcystins (MC) are the most studied toxins of cyanobacteria since they are widely distributed and account for several cases of human and animal poisoning, being potent inhibitors of the serine/threonine protein phosphatases 1 (PP1) and 2A (PP2A). The phosphatases PP1 and PP2A are also present in plants, which may also suffer adverse effects due to the inhibition of these enzymes. In aquatic plants, biomass reduction is usually observed after absorption of cyanotoxins, which can bioaccumulate in its tissues. In terrestrial plants, the effects caused by microcystins vary from inhibition to stimulation as the individuals develop from seedling to adult, and include reduction of protein phosphatases 1 and 2A, oxidative stress, decreased photosynthetic activity and even cell apoptosis, as well as bioaccumulation in plant tissues. Thus, the irrigation of crop plants by water contaminated with microcystins is not only an economic problem but becomes a public health issue because of the possibility of food contamination, and this route of exposure requires careful monitoring by the responsible authorities.
RESUMO
Microcistinas (MC) são as toxinas de cianobactérias mais estudadas, uma vez que são amplamente distribuídas e responsáveis por vários casos de intoxicação humana e animal. São potentes inibidoras das proteínas fosfatases serina/treonina 1 (PP1) e 2A (PP2A). As fosfatases PP1 e PP2A também estão presentes em plantas, as quais podem sofrer efeitos adversos devido à inibição dessas enzimas. Em plantas aquáticas, a redução da biomassa é geralmente observada após absorção de cianotoxinas que podem bioacumular em seus tecidos. Em plantas terrestres, os efeitos causados pelas microcistinas variam de inibição ao estímulo, como no desenvolvimento de plântulas ao estádio adulto, e incluem a redução de proteínas fosfatases 1 e 2A, estresse oxidativo, diminuição da atividade fotossintética e até mesmo apoptose celular, bem como a bioacumulação em tecidos de plantas. Assim, a irrigação de plantas cultivadas com água contaminada com microcistina não é apenas um problema econômico, mas torna-se um problema de saúde pública, devido à possibilidade de contaminação dos alimento, sendo uma via de exposição que requer um monitoramento cuidadoso por parte das autoridades responsáveis.
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Full text: Available Index: LILACS (Americas) Main subject: Bacterial Toxins / Crops, Agricultural / Microcystins Type of study: Risk factors Language: English Journal: Braz. j. biol Journal subject: Biology Year: 2014 Type: Article Affiliation country: Brazil Institution/Affiliation country: University of São Paulo – USP/BR

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Full text: Available Index: LILACS (Americas) Main subject: Bacterial Toxins / Crops, Agricultural / Microcystins Type of study: Risk factors Language: English Journal: Braz. j. biol Journal subject: Biology Year: 2014 Type: Article Affiliation country: Brazil Institution/Affiliation country: University of São Paulo – USP/BR