Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Insect gut detects unhealthy meal

21.12.2007
Plant leaves and surfaces are teeming with microbial life, yet the insects that feed on plants lack adaptive immune systems to fend off any intruding microorganisms they eat along with their greens. Now research published in the online open access journal, BMC Biology shows how food-borne bacteria affect an insect’s immune system.

Study authors Dalial Freitak, David Heckel and Heiko Vogel from the Max Planck Institute for Chemical Ecology in Jena, Germany along with Christopher Wheat from the University of Helsinki, Finland, deliberately fed insects with non-infectious microorganisms.

The researchers watched to see how the herbivorous insect, the cabbage semilooper Trichoplusia ni (Lepidoptera), detected and responded to a diet laced with nonpathogenic, non-infectious bacteria. In most studies to date, lab reared insects have been injected with bacterial strains, whereas in nature the insects’ main exposure would be from eating plants.

The larvae were reared on diets with or without an added helping of Escherichia coli and Micrococcus luteus bacteria. In the bacteria-fed larvae, general antibacterial activity was enhanced, although the activity of one key enzyme related to immune response - phenoloxidase - was inhibited. Among the eight proteins highly expressed in the hemolymph of the bacteria-fed larvae were the immune-response-related proteins arylphorin, apolipophorin III and gloverin. Significantly, the pupation time and pupal mass of bacteria-fed larvae was negatively affected by their unhealthy diet.

... more about:
»bacteria »immune »larvae

The authors conclude that even non-pathogenic bacteria in food can trigger an immune response in insects with significant effects. “Trichoplusia ni larvae are able to detect and respond to environmental microbes encountered in the diet, possibly even using midgut epithelial tissue as a sensing organ,” says Vogel. Although this reaction to microbes comes at a price, it may be offering protection from serious infection. “These results show that microbial communities on food plants represent a dynamic and unstudied part of the coevolutionary interactions between plants and their insect herbivores,” he adds.

Charlotte Webber | alfa
Further information:
http://www.biomedcentral.com/bmcbiol/

Further reports about: bacteria immune larvae

More articles from Life Sciences:

nachricht Scientists spin artificial silk from whey protein
24.01.2017 | Deutsches Elektronen-Synchrotron DESY

nachricht Choreographing the microRNA-target dance
24.01.2017 | UT Southwestern Medical Center

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists spin artificial silk from whey protein

X-ray study throws light on key process for production

A Swedish-German team of researchers has cleared up a key process for the artificial production of silk. With the help of the intense X-rays from DESY's...

Im Focus: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Breaking the optical bandwidth record of stable pulsed lasers

24.01.2017 | Physics and Astronomy

Choreographing the microRNA-target dance

24.01.2017 | Life Sciences

Spanish scientists create a 3-D bioprinter to print human skin

24.01.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>