Approximately half of the world's population are infected with Helicobacter pylori, found primarily in the stomach. The majority never show any symptoms, but just over ten per cent develop gastric ulcers, while around one per cent develop gastric adenocarcinoma. Without antibiotics the body is unable to rid itself of the bacteria.
"Helicobacter pylori inhibits our immune defence, preventing it from attacking the bacteria with sufficient strength, despite an immune response being activated," says biologist Malin Hansson, the author of the thesis.
When an immune response is initiated a specific type of cell migrates to the lymph nodes to activate new immune cells, telling them where they need to go to tackle the infection. Infection with Helicobacter pylori prevents many of these cells from reaching their intended destination.
"Helicobacter pylori causes immune cells to accumulate in tissue. Many of the cells that ought to collect more new immune cells stop at these accumulations and begin activating these instead, leading to chronic inflammation, which we believe benefits Helicobacter pylori," says Malin Hansson.
This thesis also paves the way for a future vaccine against gastric adenocarcinoma. Previous research has shown that many infected patients with gastric adenocarcinoma have low levels of a specific type of antibody in tissue, even though Helicobacter pylori normally causes unusually high levels of antibodies. These antibodies should therefore be able to protect against this form of cancer. For the first time in samples taken from humans Malin Hansson has been able to show that these antibodies are attracted to tissue by a signal substance called MEC.
"If these antibodies really can protect against development of gastric adenocarcinoma, it would be possible to develop a vaccine that increases MEC expression and thus the number of antibodies present in tissue," says Malin.
Nanoparticles as a Solution against Antibiotic Resistance?
15.12.2017 | Friedrich-Schiller-Universität Jena
Plasmonic biosensors enable development of new easy-to-use health tests
14.12.2017 | Aalto University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences