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Related Experiment Video

Updated: Feb 15, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
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Methicillin-resistant Staphylococcus aureus causes sustained collecting lymphatic vessel dysfunction.

Dennis Jones1,2, Eelco F J Meijer1,2, Cedric Blatter2,3

  • 1Edwin L. Steele Laboratory, Department of Radiation Oncology, MGH Cancer Center, Massachusetts General Hospital, 100 Blossom Street, Boston, MA 02114, USA.

Science Translational Medicine
|January 19, 2018
PubMed
Summary

Methicillin-resistant Staphylococcus aureus (MRSA) infections acutely impair lymphatic vessel function and lymph flow. MRSA exotoxins kill lymphatic muscle cells, causing chronic lymphatic dysfunction, suggesting the accessory gene regulator (agr) as a therapeutic target.

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Area of Science:

  • Infectious Diseases
  • Immunology
  • Vascular Biology

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant global health threat, causing morbidity and mortality, particularly through skin and soft tissue infections (SSTIs).
  • Lymphedema, characterized by impaired lymphatic vessel function leading to tissue fluid accumulation, is a known risk factor for SSTIs and can also result from recurrent SSTIs, indicating a complex bidirectional relationship.
  • The precise mechanisms underlying how SSTIs impact lymphatic vessel function, and vice versa, remain largely unknown.

Purpose of the Study:

  • To investigate the impact of MRSA infection on lymphatic vessel function and identify the underlying molecular mechanisms.
  • To determine if MRSA infection causes persistent lymphatic dysfunction even after the pathogen is cleared and inflammation subsides.
  • To explore potential therapeutic targets for preserving lymphatic function during MRSA SSTIs.

Main Methods:

  • Utilized intravital imaging in a mouse model to assess lymphatic vessel contractility and lymph flow following localized MRSA infection.
  • Examined the structural integrity and function of lymphatic muscle cells (LMCs) in infected tissues.
  • Conducted in vitro experiments exposing LMCs to MRSA-conditioned supernatant and employed proteomic analysis to identify MRSA virulence factors involved.
  • Compared lymphatic function in mice infected with wild-type MRSA versus an accessory gene regulator (agr) mutant MRSA strain.

Main Results:

  • MRSA infection caused an immediate decrease in lymphatic vessel contractility and lymph flow in mice.
  • Lymphatic dysfunction persisted long after MRSA clearance and resolution of inflammation, associated with loss and disorganization of LMCs.
  • MRSA-derived exotoxins, regulated by the accessory gene regulator (agr) system, were identified as mediators of LMC death in vitro.
  • Mice infected with agr mutant MRSA exhibited preserved lymphatic function compared to those infected with wild-type MRSA.

Conclusions:

  • MRSA infection directly impairs lymphatic vessel function through the killing of lymphatic muscle cells, mediated by agr-controlled exotoxins.
  • This damage leads to chronic lymphatic impairment, highlighting a critical link between SSTIs and lymphedema.
  • Targeting the MRSA agr system presents a promising strategy to maintain lymphatic vessel integrity and bolster host immunity during SSTIs.