Novo estudo afirma que resíduos de Roundup em alimentos geneticamente modificados podem causar lesões celulares, por Henrique Cortez
janeiro 12, 2009 2 Comentários
Um novo estudo do CRIIGEN, Comité de Recherche et d’Information Indépendantes sur le génie GENétique, demonstrou que resíduos do Roundup, encontrados nos alimentos e rações geneticamente modificadas, podem causar danos celulares e até mesmo a morte, mesmo em níveis de concentração muito baixos. Os autores afirmam que a sua investigação “pontos … a efeitos indesejáveis, que são atualmente mascarados ou ocultados a partir de análise científica.”
Este é outro exemplo de danos associados com culturas geneticamente modificadas, que se encontram atualmente no mercado.
Neste caso, os prejuízos são “indiretos”, mas inevitáveis, uma vez que todas culturas geneticamente modificadas, para tolerância ao RR e utilizadas para alimentação humana e animal conterão resíduos RR em níveis iguais ou superiores aos estudados.
A cada dia surgem novos e mais detalhados estudos sobre os riscos associados às culturas transgênicas. Lamentavelmente, para a liberação de culturas, a maioria dos países, o Brasil incluído, apenas levam em consideração os “estudos” da própria indústria, desprezando os estudos contrários.
Há muito tempo que o “princípio da precaução” foi reduzido a um mero discurso oco.
Glyphosate Formulations Induce Apoptosis and Necrosis in Human Umbilical, Embryonic, and Placental Cells
by Nora Benachour and Gilles-Eric Séralini*
Chem. Res. Toxicol., Article DOI: 10.1021/tx800218n
Publication Date (Web): December 23, 2008
Copyright © 2008 American Chemical Society
We have evaluated the toxicity of four glyphosate (G)-based herbicides in Roundup (R) formulations, from 105 times dilutions, on three different human cell types. This dilution level is far below agricultural recommendations and corresponds to low levels of residues in food or feed. The formulations have been compared to G alone and with its main metabolite AMPA or with one known adjuvant of R formulations, POEA. HUVEC primary neonate umbilical cord vein cells have been tested with 293 embryonic kidney and JEG3 placental cell lines. All R formulations cause total cell death within 24 h, through an inhibition of the mitochondrial succinate dehydrogenase activity, and necrosis, by release of cytosolic adenylate kinase measuring membrane damage. They also induce apoptosis via activation of enzymatic caspases 3/7 activity. This is confirmed by characteristic DNA fragmentation, nuclear shrinkage (pyknosis), and nuclear fragmentation (karyorrhexis), which is demonstrated by DA PI in apoptotic round cells. G provokes only apoptosis, and HUVEC are 100 times more sensitive overall at this level. The deleterious effects are not proportional to G concentrations but rather depend on the nature of the adjuvants. AMPA and POEA separately and synergistically damage cell membranes like R but at different concentrations. Their mixtures are generally even more harmful with G. In conclusion, the R adjuvants like POEA change human cell permeability and amplify toxicity induced already by G, through apoptosis and necrosis. The real threshold of G toxicity must take into account the presence of adjuvants but also G metabolism and time-amplified effects or bioaccumulation. This should be discussed when analyzing the in vivo toxic actions of R. This work clearly confirms that the adjuvants in Roundup formulations are not inert. Moreover, the proprietary mixtures available on the market could cause cell damage and even death around residual levels to be expected, especia lly in food and feed derived from R formulation-treated crops.
Press Release: CRIIGEN – January 2009
DIFFERENT ROUNDUP FORMULATIONS LEAD TO EMBRYONIC, UMBILICAL CORD AND PLACENTAL CELL DEATH AND ARE POORLY ASSESSED
For the first time, the toxicity mechanisms of four different Roundup formulations were studied in human cells. They act at doses where they are not herbicides anymore. The cells were neonatal cells freshly isolated from the umbilical cord, or less sensitive cell lines specially used to measure pollutant toxicity. The various components of these major herbicides were tested because they are among the most common in the world. Their residues are among the major pollutants, and moreover they are authorized as residues contaminating GM foods and feed at the tested levels.
As a matter of fact, Roundup formulations are the most common herbicides used with cultivated GMOs. Roundup Ready soya, the main GMO imported in Europe for food and feed, contains Roundup residues. In this research, the formulations were diluted at minimal doses (up to 100,000 times or more) and they programmed cell death in a few hours in a cumulative manner. We also noted membrane and DNA damages, and found that the formulations inhibit cell respiration. In addition, it was shown that the mixture of the components used as Roundup adjuvants amplified the action of the active principle called glyphosate; one of its metabolites may be even more toxic. These effects are greatly underestimated by the legislation, which does not take these phenomena into account, but instead simply sets arbitrary contaminant thresholds in food or feed. The rules apply to glyphosate whatever its formulation may be, this is wrong.
The authorizations for using these Roundup herbicides must now clearly be revised, since their toxic effects depend on, and are multiplied by, other compounds used in the mixtures placed on the market; and glyphosate is only one of them. The detailed blood analyses of each mammal which has received this herbicide during regulatory tests before commercial release must be published immediately, since our research points to undesirable effects which are currently masked or hidden from scientific scrutiny.
This independent work was performed by Nora Benachour and Prof. Gilles-Eric Séralini in the University of Caen in France. It is published in the Scientific American journal Chemical Research in Toxicology. It was supported by CRIIGEN and the Regional Council of Basse Normandie. The support of the Human Earth Foundation and Denis Guichard Foundation is also acknowledged.
Contact in France: Pr Gilles-Eric Séralini, Biochemistry, Institute of Biology, University of Caen, Esplanade de la Paix, 14032 Caen, France.
Tel: 33(0) 2-31-56-56-84. Fax: 33(0)2-31-56-53-20.
President of CRIIGEN
“Glyphosate Formulations Induce Apoptosis and Necrosis in Human Umbilical, Embryonic and Placental Cells” by Nora Benachour and Gilles-Eric Séralini. ()
[Por Henrique Cortez, do EcoDebate, 12/01/2009]
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