Example 16
To show that the mode of delivery and continuous protein production enabled by the lactic acid bacteria is important for the mechanism, murine recombinant mCXCL12 1α, mCXCL17, mYm1 (total of 200 ng in 60 μl, all RnD Systems) or saline (10 μl) as control was delivered to the wound once daily every 10th minute for one hour.
For mCXCL12 1α, delivery of 30 ng into the peritoneal cavity induces significantly increased recruitment of immune cells in 3 hours, why 200 ng to an area of 25 μm2 is to be considered a high dose.
It is likely that the high protease activity in the wound degrades the chemokines when given as recombinant protein at one single time point, and thus the de novo production by the bacteria is required for the protein to enhance wound closure. In addition, the lactic acid bacteria might also provide a beneficial local environment for wound healing (FIGS. 1B, 4A, 4B, 4C, 5A, 5B, 24A, 24B, 30A, 30B, 30C, 31A and 31B).