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Epithelial Cell Infection Analyses with Shigella
04:56

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Published on: February 9, 2024

Natural products modulate Shigella-host-cell interaction.

Dan Xu1, Amir Saeed2, Yili Wang1

  • 1Centre for Vaccine Development, School of Life Sciences, Xi'an JiaoTong University, Xi'an, PR China.

Journal of Medical Microbiology
|July 2, 2011
PubMed
Summary
This summary is machine-generated.

Natural compounds like propolin D inhibit bacterial growth within host cells, offering new strategies for treating infections. These natural products modulate host-pathogen interactions without directly killing bacteria.

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Imaging Ca2+ Responses During Shigella Infection of Epithelial Cells
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Published on: May 24, 2018

Area of Science:

  • Microbiology
  • Immunology
  • Natural Product Chemistry

Background:

  • Bacterial infections pose a significant global health challenge, necessitating novel therapeutic approaches.
  • Exploring natural products offers a promising avenue for discovering new antimicrobial agents.
  • Understanding host-pathogen interactions is crucial for developing effective treatments.

Purpose of the Study:

  • To identify natural products that can modulate bacterial infections by targeting host-cell interactions.
  • To investigate the effects of 4-methoxycinnamic acid and propolin D on Shigella sonnei infection.
  • To elucidate the mechanisms by which these compounds exert their protective effects.

Main Methods:

  • In vitro assays to assess bacterial proliferation within HEp-2 cells.
  • Analysis of apoptosis in infected U937 cells.
  • Measurement of cytokine secretion (IL-1β and IL-18).
  • Investigation of bacterial intracellular survival mechanisms, including vacuole escape and actin-based motility.

Main Results:

  • 4-methoxycinnamic acid and propolin D inhibited Shigella sonnei proliferation within HEp-2 cells.
  • Propolin D reduced apoptosis in infected U937 cells and moderately decreased IL-1β and IL-18 secretion.
  • Propolin D likely inhibited invasion plasmid antigen B secretion.
  • Propolin D did not affect bacterial escape from phagocytic vacuoles or intracellular survival.

Conclusions:

  • Natural compounds, specifically propolin D, can modulate Shigella-host-cell interactions to provide host cell benefits.
  • These compounds exhibit no direct in vitro antibacterial activity, suggesting novel mechanisms of action.
  • Further research is needed to define the precise molecular targets and pathways involved in these host-directed effects.