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Immunological blocking of spermidine-mediated host-pathogen communication provides effective control against

Jianhe Wang1,2, Jing Wang2, Lian-Hui Zhang1,2

  • 1Guangdong Province Key Laboratory of Microbial Signals and Disease Control, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.

Microbial Biotechnology
|May 16, 2018
PubMed

Insights

A novel antibody (Mab 4E4) targets polyamines spermidine and spermine, crucial for Pseudomonas aeruginosa virulence. This antibody effectively blocks bacterial infection in vitro and in vivo, improving survival rates and reducing lung injury in mice.

Area of Science:

  • Microbiology
  • Immunology
  • Pathogen-host interactions

Background:

  • Pseudomonas aeruginosa infections are life-threatening.
  • The type III secretion system (T3SS) is a key virulence factor in P. aeruginosa.
  • Polyamines, spermidine (Spd) and spermine (Spm), from the host activate bacterial T3SS.

Purpose of the Study:

  • To develop a therapeutic strategy by blocking host-pathogen communication.
  • To generate a high-potency monoclonal antibody targeting host polyamines.

Main Methods:

  • Developed a mouse monoclonal antibody (Mab 4E4) using Spm-protein conjugate.
  • Assessed antibody specificity for Spd and Spm.
  • Evaluated antibody efficacy in vitro using A549 cells and in vivo using a murine model of P. aeruginosa infection.

Main Results:

  • Mab 4E4 specifically recognized Spd and Spm.
  • In vitro, Mab 4E4 protected A549 cells by blocking polyamine uptake and downregulating T3SS expression.
  • In vivo, Mab 4E4 reduced serum polyamine levels for over a week and protected mice from lung injury, significantly improving survival rates.

Conclusions:

  • Blocking host polyamine signals is a viable strategy to control P. aeruginosa infections.
  • Mab 4E4 is a promising therapeutic candidate for treating P. aeruginosa infections by disrupting T3SS-mediated virulence.

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