Alpha-toxin induces programmed cell death of human T cells, B cells, and monocytes during USA300 infection.

PloS One
Tyler K NygaardJovanka M Voyich

Abstract

This investigation examines the influence of alpha-toxin (Hla) during USA300 infection of human leukocytes. Survival of an USA300 isogenic deletion mutant of hla (USA300Δhla) in human blood was comparable to the parental wild-type strain and polymorphonuclear leukocyte (PMN) plasma membrane permeability caused by USA300 did not require Hla. Flow cytometry analysis of peripheral blood mononuclear cells (PBMCs) following infection by USA300, USA300Δhla, and USA300Δhla transformed with a plasmid over-expressing Hla (USA300Δhla Comp) demonstrated this toxin plays a significant role inducing plasma membrane permeability of CD14(+), CD3(+), and CD19(+) PBMCs. Rapid plasma membrane permeability independent of Hla was observed for PMNs, CD14(+) and CD19(+) PBMCs following intoxication with USA300 supernatant while the majority of CD3(+) PBMC plasma membrane permeability induced by USA300 required Hla. Addition of recombinant Hla to USA300Δhla supernatant rescued CD3(+) and CD19(+) PBMC plasma membrane permeability generated by USA300 supernatant. An observed delay in plasma membrane permeability caused by Hla in conjunction with Annexin V binding and ApoBrdU Tunel assays examining PBMCs intoxicated with recombinant Hla or infected with...Continue Reading

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Methods Mentioned

BETA
electrophoresis
PCR
Assay
flow cytometry

Software Mentioned

Graphpad Prism

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