GMO : Independent Scientists Demand A Ban on GM Food & Feed while All GM Crops Are Tested
by : EMILY
Saturday May 20, 2006 - 10:07
Immune Reactions to Transgenic Protein Serious
Independent Scientists Demand A Ban on GM Food & Feed while All GM Crops Are Tested
The following memo and report were sent to international and national regulators on behalf of the Independent Science Panel.
Please circulate widely, forward to your regulators and policy makers, and the press.
To: (see list at the end)
I am writing on behalf of the Independent Science Panel (ISP)* to draw your attention to new research findings on the safety of transgenic proteins that need to be urgently addressed.
Specifically, immunological assessments carried out for the first time on a transgenic protein revealed that post-translational processing subsequent to gene transfer into an alien species introduced new antigenicities that turned a previously harmless protein into a strong immunogen. In addition, the transgenic protein promoted immune reactions against multiple other proteins in the diet. The detailed findings are reviewed in the report below.
As practically all the transgenic proteins involve cross-species gene transfer, they will be subjected to different post-translational processing, and hence they too, will have the potential to become immunogenic. And yet, none of the transgenic proteins that have been commercially approved has been tested. This omission is a most serious public health issue.
We call on you to impose an immediate ban on all GM food and feed until proper assessment on the immunogenicity of all the transgenic proteins has been carried out.
*The ISP, launched 10 May 2003 at a public conference in London, UK, consists of dozens of prominent scientists from 11 countries spanning the disciplines of agroecology, agronomy, biomathematics, botany, chemical medicine, ecology, epidemiology, histopathology, microbial ecology, molecular genetics, nutritional biochemistry, physiology, toxicology and virology (http://www.indsp. org/ISPMembers.php)
Transgenic Pea that Made Mice Ill
Raises serious safety concerns on transgenic proteins in general that must be addressed while a ban on all GM food and feed is imposed. Dr. Mae-Wan Ho
Ten-year project down the drain but are the right lessons learned?
A ten- year project at CSIRO (Commonwealth Scientific and Industrial Research Organization) in Canberra Australia bit the dust when peas modified to resist insects caused inflammation in the lungs of mice . The GM peas will be destroyed, said Gene Technology Regulator Sue Meeks.
The gene coding for the protein, a-amylase inhibitor-1 (aA1) in the common bean (Phaseolus vulgaris L. cv. Tendergreen), was inserted into pea (Pisum sativum L.) to make the pea-plants resistant to attack from weevils.
Dr. T.J. Higgins, deputy chief of CSIRO Plant Industry and co-author of the scientific paper reporting the results remarked it is only the second time in the world that a GM project has been abandoned after a gene transfer from one crop to another, and that it demonstrated the effectiveness of strict regulations on research into GM crops.
Greenpeace campaigner Jeremy Tager said: “It just shows the failure of the science in relation to this gene product.”
Director of GeneEthics Network Bob Phelps referred to the project as a “waste of public money” and highlights the growing concern worldwide about the health impacts of all GM foods.
There are indeed important lessons to be learned from the scientific findings , which raise serious safety concerns over transgenic proteins in general.
Different processing of transgenic protein
The researchers found that the transgenic protein was processed differently and provoked immune reactions not exhibited by the native protein (see later).
Transgenic aA1 protein was compared with the non-transgenic protein on Western blot, a technique that separates different forms of the protein arising from post-translational processing. Previous studies showed that the native polypeptide in bean is cleaved into two chains, a and b, both of which are glycosylated (carbohydrate chains added), and with one or more amino acids removed from the tail end. This results in major forms of the a- and b-chains with molecular masses 11 646 Da and 17 319 Da respectively, together with minor forms containing alternative carbohydrate chains. The transgene in pea yielded a- and b-chains with molecular masses in the11 000 - 18 000 Da region, but with a banding pattern different from the native protein. More detailed comparisons on mass spectroscopy showed that the transgenic a-chain was less heavily glycosylated; and a form with two fewer mannose residues (11 322 Da) was the dominant in transgenic pea, but the least abundant in bean. The b-chain in the transgenic protein also showed a number of other bands besides the major and minor forms present in the native protein.
Immune reactions to transgenic protein
Mice were given about 25mg of seed meal in suspension, containing transgenic pea, nontransgenic pea, or bean, twice a week for 4 weeks. Seven days after the final feeding, the mice were subcutaneously injected in the footpad with the purified protein antigens: native or transgenic aA1, and the swelling induced in the footpad assessed 24 h later.
In a second experiment, the mice were fed seed meal suspensions as before, and seven and nine days after the final meal, purified transgenic aA1 or buffered saline was introduced into the trachea, and inflammation response was measured in the lungs 24 h later.
The results showed that mice fed on non-transgenic pea or bean showed no inflammation response in the footpad or in the lungs, indicating normal immune tolerance to common food.
Mice fed with transgenic pea, however, showed aA1-specific IgG antibodies at two weeks, rising to significant levels after 4 weeks. There was significant swelling of the footpad, or delayed type hypersensitive (DTH) response, when purified aA1 was injected. Similarly, introducing the antigens into the trachea gave an inflammation response in the lungs.
As a control for the general effect of genetic modification, the footpad challenge experiment was repeated with material from two other GM plants, lupin expressing sunflower seed albumin (SSA) and chickpeas expressing aA1. In contrast to transgenic pea, mice fed transgenic lupin or transgenic chickpea did not give DTH response. This shows that the response to transgenic pea was specific.
The peribronchial lymph nodes of the mice were tested for their response to transgenic aA1. Only the lymph nodes of mice fed transgenic peas responded by producing the inflammation cytokines (cell signalling factors) when challenged with transgenic aA1.
Transgenic protein promotes reactions to other proteins
In order to test if the transgenic protein promotes immune reactions to other proteins in the diet, mice were fed purified transgenic or native aA1, or transgenic aA1 with or without ovalbumin three times a week for 2 weeks. One week following feeding, purified ovalbumin or buffered saline were introduced into the trachea of the mice, and inflammation response in the lungs was assessed as before.
Neither ovalbumin alone, nor ovalbumin in combination with native aA1 caused any inflammation response in the footpad or lungs when the mice were challenged with ovalbumin. However, consumption of transgenic aA1 and ovalbumin together promoted a strong ovalbumin-specific antibody response and predisposed the mice to inflammation when challenged with ovalbumin in both the footpad and the trachea. This suggests that transgenic aA1 did promote reactions to other proteins. In confirmation of that, levels of antigen-specific IgG against other proteins such as pea globulins, lectin, and vicilin-4 were also significantly higher in the serum of mice fed transgenic pea than mice fed non-transgenic pea.
Wider implications on the safety of transgenic proteins that must be addressed
The transgenic pea involved gene transfer between plant species, and is generally thought to be much safer compared with the cross-kingdom gene transfer - bacteria to plant - involved in the GM food crops that now cover tens of millions of hectares worldwide.
A harmless bean protein expressed in transgenic pea caused inflammation in mice, and research showed that the most likely reason is because the protein is processed differently in peas. Such post- translational processing of proteins is well known to be species-specific, and as genetic modification almost invariably involves cross-species transfer of proteins, one must expect transgenic proteins to differ structurally from the native proteins as a matter of course. Are they also likely to provoke immune reactions as a result?
It would not happen in every case, as the researchers have found that neither transgenic lupin sunflower seed albumin, nor transgenic chickpea aA1 gave the same results as transgenic pea aA1. But how frequently could it happen?
“Currently, we do not know the frequency at which alterations in structure and immunogenicity of transgenically expressed proteins occur or whether this is unique to transgenically expressed aA1.” The researchers admitted.
Furthermore, when consumed with other proteins, the transgenic pea protein promoted immunological ‘cross-priming’ against those proteins, so that the mice developed specific immunological reactions to them as well. In other words, the transgenic protein can provoke generalised immune response to multiple proteins in the diet, whether transgenic or not.
The previous instance of a GM project being abandoned was the transfer of a Brazil nut allergen into soya , and it involved a known allergen. The present case involves a protein that has all the appearance of being harmless.
As yet, no other GM crop, especially those already out there in the fields and in our food and feed, has been tested in this way. This must now be done. Meanwhile, there must be a ban imposed on all GM food and feed.
References 1 1. “GM crops scrapped as mice made ill”, Selina Mitchell and Leigh Dayton, The Australian, 18 November 2005. http://www.theaustralian. news.com.au/common/story_page/0,5744,17283002%255E2702,00.ht ml 2 Prescott VE, Campbell PM, Moore A, Mattes J, Rothenberg ME, Foster PS, Higgins TJV and Hogan SP. Transgenic expression of bean a-amylase inhibitor in peas results in altered structure and immunogenicity. J Agricultural and Food Chemistry 2005, 53, 9023-30. 3 Nordlee JA, Taylor SL, Townsend JA, Thomas LA & Bush RK. Identification of a brazil-nut allergen in transgenic soybeans. The New England Journal of Medicine 1996, March14, 688-728.
Mr. Hamdallah Zedan, Executive Secretary, Secretariat of the Convention on Biological Diversity, firstname.lastname@example.org< /A>
Cc: Mr. David Cooper, Senior Programme Officer - Interagency and Program (UK and Northern Ireland), email@example.com g
Mr. Geoffrey Podger, Executive Director, European Food Safety Authority Geoffrey.podger@ef sa.eu.int
Cc: Mr. Herman.Koeter, Director of Science, European Food Safety Authority, Herman.firstname.lastname@example.org u.int
Dr. Harry Kuiper, Chair of the GMO Panel, EFSA, email@example.com
Colin Ross, Food Standards Agency, UK, colinRoss@f oodstandards.gsi.gov.uk
Cc: Elliot Morley MP, Minister for the Environment, Emorley@aol.com
Rt. Hon Michael Meacher MP, firstname.lastname@example.org< /A>
Canadian Food Inspection Agency, Plant Products Directorate, Plant Biosafety Office, email@example.com< /P>
Cc:Hon Andrew Mitchell, Minister of Agriculture and Agri-Food and Minister of State (Federal Economic Development Initiative for Northern Ontario), Mitchell.A@parl.gc.ca
Mr. Mike Johanns, Secretary of Agriculture, USDA, United States Mike.Johanns@usda.gov
Cc: Dr. Ron DeHaven, Animal and Plant Health Inspection Service Ron.DeHaven@usda.gov< /P>
Mr. Stephen L. Johnson, Environment Protection Agency, USA firstname.lastname@example.org v
A message of your fellow striking workers from France
Tuesday 12 - 20:49by Info’Com-CGT
The Right to Vote, Effectively
Friday 8 - 22:20by William John Cox
Fourth of July Lies
Sunday 3 - 19:41by June C. Terpstra
Who Should Make Political Policy, the People or the Politicians?
Friday 24 - 15:14by William John Cox
Hollow Women of the Hegemon Part II: Atrocity Enabling Harpies
Tuesday 21 - 18:49by Dr. June Terpstra
The American Republic Manifestum book is being made into a Movie
Saturday 11 - 15:54by William Morgan
Write-in Voting and Political Protest
Wednesday 1 - 15:05by William John Cox
Yves Bouvier art battle plays out in online and social media arena
Tuesday 31 - 21:12by Dean Bagley
Damaged Candidate Clinton Can’t Call Out Trump
Friday 27 - 13:53by Daniel Patrick Welch
PLEDGE OF THE NEW REPUBLICAN PARTY
Tuesday 24 - 21:53by David R. Hoffman, Legal Editor of Pravda.Ru
LET TEXAS SECEDE
Thursday 19 - 00:53by David R. Hoffman, Legal Editor of Pravda.Ru
LAS TRES ERRES A LA ENÉSIMA POTENCIA.-
Monday 16 - 15:35by FREDDY SUBDIAGA
Monday 16 - 15:26by FREDDY SUBDIAGA
Oligarchs Won’t Let You Vote Their Wars Away
Wednesday 11 - 20:24by Daniel Patrick Welch
AN AMERICAN ORIGINAL: JOHN KERRY - FROM HIS REMARKABLE RECENT COMMENCEMENT ADDR
Monday 9 - 20:40by JOHN CHUCKMAN
Donald Trump and Hillary Clinton support the American Republic Manifestum
Monday 9 - 16:37by William Morgan
Transformation: A Student-Led Mass Political Movement
Monday 25 - 19:28by William John Cox
Algerian Feminists react to ’Hijab Day’ in Paris 2016
Monday 25 - 01:13
THE ILLUSION OF RIGHTS
Friday 22 - 18:45by JOHN CHUCKMAN
US is real superpredator pretending to be victim
Monday 18 - 22:23by Daniel Patrick Welch
Gaiacomm International has accidently created a fusion reaction/ignition.
Sunday 17 - 17:01by William Morgan
Clinton’s Campaign Continues to Highlight Horrible Hillary
Saturday 9 - 00:57by Daniel Patrick Welch
Armoiries racistes à Harvard : Plaidoyer pour la réflexion socio-historique
Thursday 7 - 18:56by Samuel Beaudoin Guzzo
THANK YOU MISSISSIPPI FOR YOUR HATE
Wednesday 6 - 02:02by David R. Hoffman, Legal Editor of Pravda.Ru
The PKK in Iraq: “We are ready to fight ISIS everywhere in the world”
Monday 4 - 14:33by InfoAut
Clinton Crashes and Burns, Sanders Will Win (But hold off on the applause)
Friday 1 - 22:33by Daniel Patrick Welch
Confirming Supreme Court Justices and Electing Presidents
Friday 1 - 20:59by William John Cox
PCBS: "As Palestinians Mark Land Day, Israeli Illegally Controls More Than 85% O
Wednesday 30 - 14:06by Palestinian Central Bureau of Statistics - PCBS
RUNAWAY TRAIN America’s election and its inability to alter the nation’s deadly
Friday 25 - 16:49by JOHN CHUCKMAN
Vicky Nuland, Neocon Hypocrite: Syria Pullout won’t ’let Russia off the hook’
Friday 18 - 15:59by Daniel Patrick Welch
Time to End the Clintons’ Unearned Pass on Race
Wednesday 16 - 23:22by Daniel Patrick Welch
TRUMP’S ANTI IMMIGRANT RACISM NOT CONFINED TO US
Wednesday 16 - 16:37by Daniel Patrick Welch
Between bids and sponsoring, Samsung’s peculiar business practices
Friday 11 - 14:49by Hannah Howard
I, European citizen, won’t let refugees be rejected in my name
Thursday 10 - 09:24
Slovaquie : Manifestation contre l’entrée au Parlement d’un parti néo-nazi
Tuesday 8 - 22:09by Samuel Beaudoin Guzzo
WHAT IS REALLY AT STAKE IN THE ODDEST AMERICAN ELECTION SEASON OF A LIFETIME
Tuesday 8 - 11:53by JOHN CHUCKMAN
I FINALLY HAVE PROOF, A CRAFT AND AN ALIEN…
Tuesday 8 - 04:55by gaiacomm
The Scandal of Voter Suppression in America
Tuesday 1 - 22:39by William John Cox
Are you bothering to vote? If so, read this about the Killmeister
Tuesday 1 - 14:14by Daniel Patrick Welch
HILLARY’S SECRET LETTER AND THE WHOLE MATTER OF ENDLESS WAR AND THE ALMOST COMPL
Monday 29 - 21:49by JOHN CHUCKMAN