Anthrax uses a receptor on the surface of cells to inject its lethal toxins. However, the physiological function of this receptor, named Anthrax Toxin Receptor 2a (Antxr2a), remained unknown until now. A team led by Marcos Gonzalez-Gaitan, a professor at the University of Geneva (UNIGE), Switzerland, in collaboration with Gisou van der Goot at EPFL (École Polytechnique Fédérale de Lausanne), reveals that Antxr2a actually plays a role in embryonic development, orienting cell division along a specific plane, which is a prelude to the formation of future tissues and organs. At the cellular level, this receptor exerts traction on the system that allows chromosomes to separate to opposite poles, the mitotic spindle, to position it along the plane of division. These results are presented in the journal Nature Cell Biology.
Anthrax is a particularly virulent germ once a person is infected by inhaling its spores. The severity of symptoms, which affect various organs, is mainly due to bacterial toxins which are lethal to cells. It is by attempting to understand how the bacillus' toxins enter cells that the Antxr2a receptor was discovered. Otherwise, its physiological role would not have been identified at present.
A cap of proteins indicates the plane of division
During animal development, the orientation of cell division along a specific plane is important for the organization of the different tissues and the generation of cellular diversity. This orientation is provided by the position of the mitotic spindle in the cell that is about to divide. This temporary assembly of microtubules forms an actual spindle between opposite poles of the cell in order to guide the migration of each set of chromosomes.
"When the cell receives an external signal to initiate its division, a cascade of biochemical events is launched to transmit the message to the interior of the cell and have it carried out. We knew that an external signal, a protein called Wnt, was necessary to properly position the mitotic spindle, but knew nothing of the intracellular messengers involved," explains Marcos Gonzalez-Gaitan, Professor in the Departments of Biochemistry and Molecular Biology at the University of Geneva.
This has now been accomplished. The scientist and his group have established the complete sequence of intracellular events allowing the mitotic spindle to align itself along the general plane of division. They conducted their experiments on zebrafish embryos, a model system in developmental studies. "Once Wnt binds to the cell membrane, different molecular agents prompt the formation of a layer of filamentous proteins along the cell membrane, at the site of the future plane of division," explains Irinka Castanon, first author of the article.
The anthrax receptor used as a control lever
This internal 'cap' associates itself in turn with the Antxr2a receptors, known to bind the anthrax toxin. The accumulation of these receptors will thus form a second layer, superimposed on the first. Everything is now in place for the final phase: "The Antxr2a receptors recruit in turn 'motor' proteins capable of attaching themselves to the mitotic spindle and pulling it towards the internal cap," states Marcos Gonzalez-Gaitan. Motor proteins probably act by travelling back up along the cap's filaments, allowing the alignment of the spindle with the plane of cell division.
In mammals, the Antxr2a receptor is also involved in the formation and proliferation of blood vessels. "It is therefore possible that the role of this receptor in the orientation of cell division is not restricted solely to embryonic development," states the professor, who is a member of two Swiss National Research Programs: Frontiers in Genetics, and Chemical Biology.
Universit� de Gen�ve: http://www.unige.ch
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
An 18-month off-road trial will test underground charging systems to juice up on the go and extend driving range
Yosemite, Redwood, and other famous parks as they look from outer space
8-year-old Harapan joins his brother at an Indonesian breeding sanctuary; fewer than 100 "hairy rhinos" are left in the world
The white Kermode bear of British Columbia is galvanizing First Nations people fighting to protect their homeland
A naturalist cuts through the myths surrounding the invasive plant
Attracting the right species can help get rid of vine-munching insects and allow farmers to cut back on pesticides
"We are seeing wildfires in the United States grow to sizes that were unimaginable just 20 or 30 years ago"
Driftwood on Iceland and other Arctic islands is younger than once thought
Electric shock training and surgery are starting to pay off for the teams fighting to save one of the world's largest birds
As bat populations dwindle, a new effort is aimed at getting North America's bat researchers working on the same page.