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Staphylococcus aureus produces pain through pore-forming toxins and neuronal TRPV1 that is silenced by QX-314

Kimbria J Blake1, Pankaj Baral1, Tiphaine Voisin1

  • 1Department of Microbiology and Immunobiology, Division of Immunology, Harvard Medical School, Boston, MA, 02115, USA.

Nature Communications
|January 4, 2018
PubMed

Insights

Pain from bacterial infections like MRSA involves bacterial toxins and the TRPV1 channel. A novel approach using QX-314 effectively blocked MRSA-induced pain, outperforming current treatments.

Area of Science:

  • Microbiology
  • Neuroscience
  • Immunology

Background:

  • Pain is a common symptom of bacterial infections, but its molecular mechanisms remain unclear.
  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen causing various infections.
  • Understanding pain pathways is crucial for developing effective analgesics.

Purpose of the Study:

  • To elucidate the molecular mechanisms of pain during live MRSA infection.
  • To identify bacterial factors and host channels involved in MRSA-induced pain.
  • To evaluate the efficacy of a novel pain-blocking strategy.

Main Methods:

  • Investigated pain in a live MRSA infection model.
  • Assessed the role of the agr virulence determinant and bacterial pore-forming toxins (PFTs).
  • Examined the involvement of the TRPV1 cation channel in heat hyperalgesia.
  • Tested the efficacy of QX-314, a sodium channel blocker, in silencing pain.

Main Results:

  • Spontaneous pain during MRSA infection depends on the agr system and PFTs.
  • Alpha-hemolysin (Hla), phenol-soluble modulins (PSMs), and leukocidin HlgAB directly induced neuronal firing and pain.
  • TRPV1 mediated heat hyperalgesia.
  • QX-314 provided immediate and long-lasting pain blockade, surpassing lidocaine and ibuprofen.

Conclusions:

  • Bacterial PFTs are key mediators of pain during MRSA infections by inducing neuronal firing.
  • TRPV1 is a critical component of MRSA-induced heat pain.
  • Targeting neuronal pores with QX-314 offers a potent and durable strategy for managing infection-associated pain.

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