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   GMO_and_SAFETY

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 LiveInternet.ru:
: 13.10.2009
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A three generation study with GM Bt corn in rats

, 09 2009 . 00:33 +

A three generation study with genetically modified Bt corn in rats: Biochemical and histopathological investigation

( : )

Kiliç A, Akay MT.

Department of Biology, Faculty of Science, Hacettepe University, Beytepe Campus, Ankara, Turkiye. aykilic@hacettepe.edu.tr

For the last ten years, in accordance with the increased use of genetically modified (GM) foods for human and livestock, a large number of feeding studies have been carried out. However, the evidence is still far from proving whether the long-term consumption of GM foods poses a possible danger for human or animal health. Therefore, this study was designed to evaluate the effects of transgenic corn on the rats that were fed through three generations with either GM corn or its conventional counterpart. Tissue samples of stomach, duodenum, liver and kidney were obtained for histopathological examinations. The average diameter of glomeruli, thickness of renal cortex and glomerular volume were calculated and number of affected animals/number of examined animals for liver and kidney histopathology were determined. Amounts of urea, urea nitrogen, creatinine, uric acid, total protein, albumin and globulin were determined; enzyme activities of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma glutamyltransferase, creatine kinase and amylase were measured in serum samples. No statistically significant differences were found in relative organ weights of rats within groups but there were some minimal histopathological changes in liver and kidney. Changes in creatinine, total protein and globulin levels were also determined in biochemical analysis.

, - . , , . , , , , , , , ; , , , , . : ( ).

PMID: 18191319
: A three generation study with genetically modified Bt corn in rats: Biochemical and histopathological investigation.




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Effects of Bt corn on reproductive performance in laying hens

, 27 2009 . 18:11 +

Effect of Bt (Bacillus thuringiensis) corn on reproductive performance in adult laying hens

( Bt (Bacillus thuringiensis) )

Rasmussen MA, Cutler SA, Wilhelms KW, Scanes CG.

National Animal Disease Center, Ames, IA 50010, USA-Department of Animal Science, Program in Toxicology, Iowa State University, Ames, IA 50011, USA

Genetically Modified (GM) crops are widely used. Research has focused on examining differences between GM and conventional corn feeding on broiler performance and carcass composition. However, relatively little attention has been focused on reproductive effects on the recipient animals. To address this, the present study employed laying hens as a model due to their rapid reproductive development and rate of egg production. This study investigated the putative effects of a diet consisting of Starlink corn (expressing the Bacillus thuringiensis gene Cry9C) on the fecundity of the laying hen. Twenty-week-old point of lay pullets were fed a diet containing corn positive for the Cry9C (Starlink) gene (not a current variety) for 3 weeks, paired with a corn-based diet known not to contain the gene. During the study, the number of eggs collected, egg shell thickness, number of yolks and egg weight and, upon necropsy, body, ovary and ovary weight, together with the number of yolky (yellow) follicles were recorded. There were no negative effects observed on any parameter measured. The present data do not suggest that Bt corn is a cause of concern to the poultry or livestock industry.

. , Starlink ( Cry9C Bacillus thuringiensis) . , Bt- (Starlink) Cry9C - , 3- . , , , - , , , . : . Bt- .

Abstract.
: Effects of Bt (Bacillus thuringiensis) corn on reproductive performance in adult laying hens.


 


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Effect of subchronic feeding of GM corn on immune system in BN rats and B10A mice

, 24 2009 . 22:56 +

Effect of subchronic feeding of genetically modified corn (CBH351) on immune system in BN rats and B10A mice

( (CBH351) BN B10A-)


National Institute of Health Sciences: 1-18-1, Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan.

Subchronic animal feeding studies to examine the effect on the immune system of genetically modified corn CBH351, which contains the Cry9C protein derived from Bacillus thuringiensis subspecies tolworthi, were conducted in female BN rats and B10A mice. The studies were designed to compare the effect of a line of genetically modified corn CBH351 (GM corn) with that of isoline corn (non-GM corn). Heat-treated corn meal was incorporated into the diets of the rats and mice at a concentration of 50%. The study duration was 13 weeks. Growth, food intake, and organ weights of the thymus, spleen, and liver were compared between animals fed the non-GM and GM lines. The histological findings in thymus, spleen, mesenteric lymph nodes, Peyer's patches, small intestines, liver, kidney, and bone marrow, and the presence of Cry9C-specific IgE, IgG, IgG1 and IgA antibodies in serum were also compared. The results showed no significant differences in growth, feeding value, or the histological findings in immunity-related organs between the animals fed the GM and non-GM lines. Production of Cry9 C-specific IgE and IgA was not detected in the serum of either group. Production of Cry9C-specific IgG and IgG1 was slightly increased in the 50% GM groups of BN rats. No Cry9C-specific IgG or IgG1 was detected in the serum of BN rats fed the diet containing 5% GM-corn In conclusion, no immunotoxic activity was detected in the GM-corn-fed rats and mice in this subchronic dietary study.

CBH351, Cry9C, Bacillus thuringiensis subspecies tolworthi, , BN B10A-. CBH351 ( ) (-) . 50%. 13 . , , , - . , , , , , , , Cry9C IgE,IgG, IgA IgG1 . , , - . Cry9C IgA IgE . IgG IgG1 50% BN- : Bt- .

PMID: 12607925
: Effect of subchronic feeding of genetically modified corn (CBH351) on immune system in BN rats and B10A mice.


 


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Evaluation of Bt corn on mouse testicular development by flow cytometry

, 22 2009 . 21:30 +

Evaluation of Bt (Bacillus thuringiensis) corn on mouse testicular development by dual parameter flow cytometry

( Bt- )


Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, USA.

The health safety of Bt (Bacillus thuringiensis) corn (Zea mays L.) was studied using mouse testes as a sensitive biomonitor of potential toxic effects. Pregnant mice were fed a Bt corn or a nontransgenic (conventional) diet during gestation and lactation. After they were weaned, young male mice were maintained on the respective diets. At 8, 16, 26, 32, 63, and 87 days after birth, three male mice and an adult reference mouse were killed, the testes were surgically removed, and the percentage of germ cell populations was measured by flow cytometry. Multigenerational studies were conducted in the same manner. There were no apparent differences in percentages of testicular cell populations (haploid, diploid, and tetraploid) between the mice fed the Bt corn diet and those fed the conventional diet. Because of the high rate of cell proliferation and extensive differentiation that makes testicular germ cells highly susceptible to some toxic agents, it was concluded that the Bt corn diet had no measurable or observable effect on fetal, postnatal, pubertal, or adult testicular development. If data from this study were extrapolated to humans, Bt corn is not harmful to human reproductive development.

Bt (Bacillus thuringiensis) (Zea mays L.) . . , (8, 16, 26, 32, 63 87 ) , , (, ) . - , , , Bt- , . , Bt- .

PMID: 15053558
: Evaluation of Bt (Bacillus thuringiensis) corn on mouse testicular development by dual parameter flow cytometry.


 


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Long term feeding of Bt-corn--a ten-generation study with quails

, 21 2009 . 23:26 +

Long term feeding of Bt-corn--a ten-generation study with quails

( Bt- )


Institute of Animal Nutrition, Federal Agricultural Research Centre, Braunschweig, Germany. gerhard.flachowsky@fal.de

A ten-generation experiment with growing and laying quails were carried out to test diets with 40 (starter) or 50% (grower, layer) isogenic or transgenic (Bt 176) corn. Feeding of diets containing genetically-modified corn did not significantly influence health and performance of quails nor did it affect DNA-transfer and quality of meat and eggs of quails compared with the isogenic counterpart.

, 40 () 50% (Bt 176) . : , , -, .

PMID: 16429830


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