Matrilysin Expression Related to Radiation and Microflora Changes in Murine Bowel.

Andrea Polistena, Louis Banka Johnson, Andrada Röme, Lena Wittgren, Sven Bäck, Nadia Osman, Göran Molin, Diya Adawi, Bengt Jeppsson

Research output: Contribution to journalArticlepeer-review


BACKGROUND: Matrilysin (MMP-7) elevation after radiotherapy is shown in humans. Matrilysin regulates certain cytokines and the production of bactericidal proteins when the mucosa is exposed to bacterial antigens. We investigate the effect of irradiation on matrilysin and microflora in murine bowel, after modulation with antibiotics. METHODS: Animals were divided into two different groups a radiation group (72 animals) and sham radiation group (36 animals). Animals were divided into smaller groups of six according to radiation dose (19 or 38 Gy or sham). Seven days before radiotherapy ampicillin 500 mg/kg/d was administered intramuscularly, in the antibiotic groups. An exteriorized segment of ileum was subjected to single high dose radiation (19 or 38 Gy). Samples were collected 2, 24, and 48 h and analyzed for microflora, MIP-2, TGF-β, and MMP-7. RESULTS: The combination of antibiotics and irradiation leads to an early significant reduction of bacteria, down-regulates MIP-2, up-regulates TGF-β and elevation of MMP-7 to levels achieved by antibiotics or irradiation alone. Lactobacilli were reduced to non-existent levels after antibiotics. CONCLUSIONS: Pretreatment with Ampicillin before irradiation and laparotomy in a murine model leads to Matrilysin over-expression as achieved by radiotherapy alone. Microfloral regulation does not affect MMP-7 stimulation after surgical or radiological trauma. Radiotherapy overrides the effect of antibiotics leading to an up-regulation of MMP-7, TGF-β and MIP-2 expression between 24 h and 48 h.
Original languageEnglish
Pages (from-to)E137-E143
JournalThe Journal of surgical research
Publication statusPublished - 2011

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Medical Radiation Physics, Malmö (013243210), Surgery Research Unit (013242220), Emergency medicine/Medicine/Surgery (013240200), Apetite Regulation (013212030)

Subject classification (UKÄ)

  • Surgery


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