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Suppression of type III effector secretion by polymers.

Takashi Ohgita1, Naoki Hayashi, Naomasa Gotoh

  • 1Department of Biophysical Chemistry, Kyoto Pharmaceutical University, Misasagi-Nakauchicho 5, Yamashina-ku, Kyoto 607-8414, Japan.

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Viscous polymers like polyethylene glycol (PEG) 8000 and alginate can suppress bacterial effector secretion. This suggests natural polymers in biofilms may regulate bacterial infection mechanisms.

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PEGPseudomonas aeruginosaalginatemucinpolymertype III secretion

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Area of Science:

  • Microbiology
  • Biochemistry
  • Polymer Science

Background:

  • Bacteria utilize type III secretion systems to deliver effector proteins into host cells, crucial for infection and toxicity.
  • Previous research indicated that the viscous polymer polyethylene glycol (PEG) 8000 inhibits effector secretion by Pseudomonas aeruginosa.

Purpose of the Study:

  • To investigate whether other viscous polymers, similar to PEG 8000, can also suppress bacterial effector secretion.
  • To explore the relationship between polymer viscosity and the inhibition of effector secretion.

Main Methods:

  • Testing the effect of various polymers, including PEG 200, PEG 8000, alginate, and mucin, on Pseudomonas aeruginosa effector secretion.
  • Analyzing the viscosity of polymer solutions and correlating it with the observed inhibition of secretion.

Main Results:

  • Polyethylene glycol 200 (PEG 200) did not inhibit effector secretion, unlike the more viscous PEG 8000.
  • High-viscous polymers, alginate and mucin, effectively suppressed effector secretion.
  • The inhibitory effect of PEG 8000 and alginate on secretion was linked to polymer viscosity, though the dependence varied.
  • Other factors beyond viscosity, such as electrostatic interactions, may also influence secretion suppression.

Conclusions:

  • Polymer viscosity is a significant factor in suppressing bacterial effector secretion.
  • Natural polymers like alginate and mucin, found in biofilms and host mucus layers, can regulate bacterial secretion.
  • These findings suggest a potential natural mechanism for controlling bacterial infection via polymer interactions.