Bracken carcinogens in the human diet

Shahin, M.; Smith, Barry L.; Prakash, A. S.

doi:10.1016/s1383-5742(99)00011-3

Cited by 66 publications

(45 citation statements)

References 67 publications

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“…Entre elas, destaca-se a espécie Pteridium aquilinum (L) Kuhn, por suas propriedades carcinogênicas para animais (Shahin et al, 1999;Alonso-Amelot et al, 2001). Propriedade semelhante foi encontrada na samambaia-do-campo, P. arachnoideum.…”

Section: Família/espécieunclassified

A vegetação da Estação Ecológica de Avaré: subsídios para o plano de manejo

Filho¹,

Baitello²,

Arzolla³

et al. 2015

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; Léo ZIMBACK 2 RESUMO -A Estação Ecológica de Avaré é uma unidade de conservação com 720,4 ha localizada no município de Avaré, sudoeste do Estado de São Paulo. O presente trabalho apresenta os resultados dos estudos sobre o tema vegetação elaborados para o seu Plano de Manejo. Com base na análise de dados primários e secundários e de fotografias aéreas, a cobertura vegetal foi caracterizada e uma proposta de zoneamento foi elaborada. Dados primários e secundários totalizaram 265 espécies de plantas vasculares, cinco delas apresentado algum grau de ameaça de extinção: Anemopaegma arvense, Cedrela fissilis, Clitoria densiflora, Machaerium villosum e Rourea pseudospadicea. Foram identificadas cinco formações vegetais, sendo três pertencentes ao bioma Cerrado e duas pertencentes ao bioma Mata Atlântica compreendendo, respectivamente, 72,17% e 24,63% da área da Estação. Entre as fisionomias de Cerrado, destaque pode ser dado às savânicas e campestres, que juntas ocupam 49,91% da Estação, acentuando a sua significância devido à representatividade relativamente elevada do componente não arbóreo do Cerrado nessas fisionomias, o qual é tido como o mais rico em espécies vegetais no bioma. Três espécies invasoras foram amostradas, o pinus (Pinus sp.), o capim-gordura (Melinis minutiflora) e a braquiária (Urochloa brizantha), sendo esta última a que representa maior ameaça para a diversidade florística da Unidade. Na proposta de zoneamento preliminar, a Zona de Recuperação foi a mais expressiva, totalizando 84,81% da área total da Unidade, onde o manejo enfatiza o controle de gramíneas invasoras.Palavras-chave: Cerrado; Mata Atlântica; unidade de conservação; zoneamento.ABSTRACT -Avaré Ecological Station is a protected area with 720.4 ha located in the municipality of Avaré, southwestern São Paulo state. This study presents the results of the vegetation survey made for its Management Plan. Based on primary and secondary data and on aereal photographs analysis, the vegetation cover was characterized and a zoning proposal was elaborated. Primary and secondary data totaled 265 vascular plant species, of which five presented some degree of extinction risk: Anemopaegma arvense, Cedrela fissilis, Clitoria densiflora, Machaerium villosum and Rourea pseudospadicea. Five plant formations were identified, three belonging to the Brazilian Savanna biome and two belonging to the Atlantic Forest biome occupying, respectively, 72.17% e 24.63% of the Station area. Among the Savanna physiognomies, highlight can be given to the grassland type ones, which occupied 49.91% of the Station, reinforcing its significance due to relatively height representativeness of the non-arboreal component in these physiognomies, which is considered as the richest component in plant species in the biome. Three invading species were sampled, the pine (Pinus sp.) and the grasses Melinis minutiflora and Urochloa brizantha, being the last the uppermost threat for the floristic diversity of the area. In the preliminary zoning the Recuperation Zone was the most exp...

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Section: Família/espécieunclassified

A vegetação da Estação Ecológica de Avaré: subsídios para o plano de manejo

Filho¹,

Baitello²,

Arzolla³

et al. 2015

IF Série Registros

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“…Metabolites from ptaquiloside and quercetin along with other chemicals from bracken are also found in the blood, urine and milk of cows naturally exposed to bracken and suffering from bladder cancer [15,80]. Exposure to ptaquiloside indirectly through milk from bracken-grazing cows has a big impact on human health, since it has been correlated with human oesophageal and gastric cancer [3,122,139]. In different parts of the world the human consumption of bracken has been linked to GI cancer [2,3,82].…”

Section: Bracken Fern As a Cofactor For Carcinogenesismentioning

confidence: 99%

Bovine papillomaviruses, papillomas and cancer in cattle

Borzacchiello¹,

Roperto²

2008

Vet. Res.

173

149

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-Bovine papillomaviruses (BPV) are DNA oncogenic viruses inducing hyperplastic benign lesions of both cutaneous and mucosal epithelia in cattle. Ten (BPV 1-10) different viral genotypes have been characterised so far. BPV 1-10 are all strictly species-specific but BPV 1/2 may also infect equids inducing fibroblastic tumours. These benign lesions generally regress but may also occasionally persist, leading to a high risk of evolving into cancer, particularly in the presence of environmental carcinogenic co-factors. Among these, bracken fern is the most extensively studied. The synergism between immunosuppressants and carcinogenic principles from bracken fern and the virus has been experimentally demonstrated for both urinary bladder and alimentary canal cancer in cows whose diets were based on this plant. BPV associated tumours have veterinary and agricultural relevance in their own right, although they have also been studied as a relevant model of Human papillomavirus (HPV). Recent insights into BPV biology have paved the way to new fields of speculation on the role of these viruses in neoplastic transformation of cells other than epithelial ones. This review will briefly summarise BPV genome organization, will describe in greater detail the functions of viral oncoproteins, the interaction between the virus and co-carcinogens in tumour development; relevant aspects of immunity and vaccines will also be discussed.

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“…Epidemiological studies have revealed a higher risk of certain types of cancers (i.e., esophageal, gastric) in people who consume bracken fern (or its toxins) directly, as in case of crosiers or rhizomes (Sugimura, 2000;Abnet, 2007), or indirectly through consumption of milk from livestock that have fed on the plant (Alonso-Amelot et al, 1996, 1999Alonso-Amelot, 1997;Shahin et al, 1999;Alonso-Amelot and Avendaño, 2002).…”

Section: Introductionmentioning

confidence: 99%