Table 1 Susceptibility of the human promyelocytic cell line HL60 (undifferentiated and differentiated) and primary human neutrophils to LukSF-PV, LukED and their hybrid leukotoxins.

From: Counter inhibition between leukotoxins attenuates Staphylococcus aureus virulence

 

Standard toxins

Hybrid toxins

Cells

LukSF-PV

LukED

LukS-PV+ LukD

LukE+ LukF-PV

Undifferentiated HL60 cells

−*

+†

−

+

Macrophage-like HL60 cells

+++‡

−

++§

−

PMN-like HL60 cells

++++||

−

−

−

Primary human neutrophils

++++

+++

+++

+++

  1. LukED, leukocidin ED; LukSF-PV, Panton–Valentine leukocidin; PMN, poly-morphonuclear neutrophils.
  2. *− No detectable lytic activity
  3. †+ LD50 >20 μg ml−1
  4. ‡+++ LD50 1–5 μg ml−1
  5. §++ LD50 5–20 μg ml−1
  6. ||++++ LD50 <1 μg ml−1