DEFENSINACTIVITY
The influence of environmental factors on antimicrobial activity of human intestinal defensins
| Coordinatore | EBERHARD KARLS UNIVERSITAET TUEBINGEN
Spiacenti, non ci sono informazioni su questo coordinatore. Contattare Fabio per maggiori infomrazioni, grazie. |
| Nazionalità Coordinatore | Germany [DE] |
| Totale costo | 1˙500˙000 € |
| EC contributo | 1˙500˙000 € |
| Programma | FP7-IDEAS-ERC
Specific programme: "Ideas" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013) |
| Code Call | ERC-2012-StG_20111109 |
| Funding Scheme | ERC-SG |
| Anno di inizio | 2013 |
| Periodo (anno-mese-giorno) | 2013-02-01 - 2018-01-31 |
Partecipanti
| # | ||||
|---|---|---|---|---|
| 1 |
ROBERT BOSCH GESELLSCHAFT FUR MEDIZINISCHE FORSCHUNG MBH
Organization address
address: AUERBACHSTRASSE 112 contact info |
DE (STUTTGART) | beneficiary | 366˙519.30 |
| 2 |
EBERHARD KARLS UNIVERSITAET TUEBINGEN
Organization address
address: GESCHWISTER-SCHOLL-PLATZ contact info |
DE (TUEBINGEN) | hostInstitution | 1˙133˙480.80 |
| 3 |
EBERHARD KARLS UNIVERSITAET TUEBINGEN
Organization address
address: GESCHWISTER-SCHOLL-PLATZ contact info |
DE (TUEBINGEN) | hostInstitution | 1˙133˙480.80 |
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Obiettivo del progetto (Objective)
'Human epithelia are permanently challenged by microorganisms. In the gut, the fraction of strict anaerobic bacteria increases from proximal to distal, reaching 99% of bacterial species in the colon. Moreover, microbial metabolism causes a reduction of the environment to a low redox potential of only –200 mV to –300 mV. Defensins, characterised by three intramolecular disulfide-bridges, are key effector molecules of innate immunity that protect the host from infectious microbes. Human β-defensin 1 (hBD-1) is one of the most prominent peptides of its class but comparison with other defensins suggested only minor antibiotic killing activity. We could recently show that hBD-1 becomes a potent antimicrobial peptide against C. albicans and anaerobic, Gram-positive commensals of the human normal flora in a reducing environment (Nature 2011). The effect was attributable to the linear, reduced hBD-1 peptide. Here we aim to investigate the antimicrobial activity of reduced hBD-1 in more detail. We will study the mechanism of its reduction by cell-culture experiments and in vitro reduction assays. The molecular details of its antibiotic action will be investigated by using bacterial mutants and further in vitro assays. Additionally we aim to characterise the antibiotic spectrum of reduced hBD-1 by using different antimicrobial assays. Also, we plan to systematically test human defensins under reducing conditions and different pH values that occur in the gut Besides we will screen extracts of human intestinal tissue and stool samples for antimicrobial substances by using the conditions described above. Extracts will be purified by HPLC and antimicrobially active fractions will be examined by MALDI-TOF peptide mass fingerprint technique. We hope to identify novel peptides which have been overlooked due to standardized testing methods. Resembling the natural conditions as close as possible will help to better understand antibiotic mucosal host defense in the intestinal tract.'