Browsing by Author "Zhang, Kunyan Jr"

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    Virulence of a Predominant Community-Associated Methicillin-resistant Staphylococcus aureus Strain USA300 in a Murine Skin Infection Model
    (2017) Zhang, Jianbo Jr; Zhang, Kunyan Jr; Armstrong, Glen Jr; Conly, John Jr; Storey, Douglas Jr
    USA300 is a predominant and highly virulent community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) strain that is a leading cause of skin and soft tissue infections. Herein a murine skin infection model was established to differentiate USA300 virulence from other MRSA strains, and reveal mechanisms contributing to USA300 hypervirulence. In this model, USA300 uniformly presented as dermonecrosis while control strains caused localized skin infection (non-dermonecrosis), which mimicked the key clinical characteristics. It was also observed that the dermonecrosis induced by USA300 was associated with significantly increased neutrophil recruitment and increased production of cytokines/chemokines associated with disease severity. The α-hemolysin (Hla) depletion not only reduced USA300 wildtype virulence in causing skin lesions, but also demonstrated significant effects on reducing neutrophil recruitment and altering local cytokines/chemokines profile. These results suggest that USA300 Hla may induce host response to cause severe skin lesions. This observation may open new opportunities for therapeutic interventions.