TABLE 1.
Organism | MIC (μg/ml) of the following compounds in the presence of NaCl at the indicated concn:
|
|||||||
---|---|---|---|---|---|---|---|---|
LL-37
|
HNP-1
|
PG-1
|
Vancomycin
|
|||||
0 mM | 100 mM | 0 mM | 100 mM | 0 mM | 100 mM | 0 mM | 100 mM | |
L. monocytogenes EGD | 1.5 | 2.2 | 39.7 | >79.1 | 0.8 | 0.7 | TUb | TU |
S. epidermidis | 7.6 | 43.9 | 5.2 | >250 | 0.7 | 1.1 | 6.0 | 8.8 |
S. aureus 930918-3 | 12.5 | 9.2 | 2.5 | 25.0 | 0.7 | 0.7 | 0.3 | 0.4 |
S. aureus 67395 | 2.9 | 5.4 | 7.9 | >250 | 0.6 | 0.9 | 0.2 | 0.7 |
S. aureus 68721 | 3.2 | 9.0 | 6.8 | >250 | 0.3 | 0.6 | 0.3 | 0.5 |
S. aureus 502A | 3.6 | 7.2 | 2.2 | >250 | 0.7 | 0.6 | 0.3 | 0.5 |
MRSA 1083 | 6.5 | >79.1 | 2.5 | >250 | 0.3 | 0.7 | 0.3 | 0.6 |
MRSA 30371 | 10.5 | >79.1 | 25.0 | >250 | 0.5 | 0.7 | 0.4 | 0.8 |
MRSA 54424-1 | 3.0 | 25.0 | 9.6 | >250 | 0.4 | 0.6 | 0.3 | 0.3 |
MRSA ATCC 33591 | 3.4 | >79.1 | 21.2 | >250 | 0.5 | 0.7 | 0.9 | 1.2 |
B. subtilis | 2.7 | 0.5 | 6.4 | 1.8 | 0.6 | 0.3 | 0.1 | 0.1 |
VREFc 94.132 (E. faecium) | 0.7 | 0.6 | 2.7 | 1.0 | 0.2 | 0.5 | >79.1 | >79.1 |
VREFd CDC 21 (E. faecalis) | 3.5 | 2.0 | 11.9 | >250 | 1.6 | 0.7 | 20.7 | 7.2 |
C. albicans 820 | >250 | >250 | >250 | >250 | 0.4 | 2.9 | >250 | >250 |
Radial diffusion assays were performed with the standard low-salt underlays and with otherwise identical underlays that also contained 100 mM NaCl. MICs correspond to the x intercepts of plots such as those illustrated in Fig. 2. The molecular mass of vancomycin is 1,448. The masses of the peptides are as follows: LL-37, 4,493; HNP-1, 3,442; PG-1, 2,056.
TU, technically unsatisfactory due to the presence of complex zones of complete and partial clearing.
VREF, vancomycin-resistant E. faecium.
VREF, vancomycin-resistant E. faecalis.