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Mouse Models of Cancer Study02:43

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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Chronic Salmonella Infected Mouse Model
09:01

Chronic Salmonella Infected Mouse Model

Published on: May 31, 2010

A mouse model for the human pathogen Salmonella typhi.

Jeongmin Song1, Tim Willinger, Anthony Rongvaux

  • 1Section of Microbial Pathogenesis, Yale University School of Medicine, New Haven, CT 06520, USA.

Cell Host & Microbe
|October 19, 2010
PubMed
Summary
This summary is machine-generated.

A new mouse model allows scientists to study Salmonella Typhi (S. Typhi), the cause of typhoid fever. This model supports S. Typhi infection and immune responses, aiding vaccine development for this human-specific disease.

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Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • Salmonella enterica serovar Typhi (S. Typhi) causes typhoid fever, a significant global health concern.
  • Studying S. Typhi is challenging due to its strict human host specificity, limiting the development of effective animal models.
  • Existing research and vaccine development for typhoid fever are hampered by the lack of suitable preclinical models.

Purpose of the Study:

  • To develop a novel animal model for studying Salmonella Typhi (S. Typhi) pathogenesis.
  • To investigate the replication and persistence of S. Typhi in a humanized mouse model.
  • To evaluate the utility of this model for understanding typhoid fever and testing vaccine candidates.

Main Methods:

  • Engrafting immunodeficient Rag2(-/-) γc(-/-) mice with human fetal liver hematopoietic stem and progenitor cells.
  • Infecting the humanized mice with wild-type S. Typhi and specific virulence-deficient mutants.
  • Analyzing S. Typhi replication, persistence, and host immune responses, including cytokine production and antibody generation.

Main Results:

  • The humanized mouse model successfully supported S. Typhi replication and persistent infection.
  • A S. Typhi mutant deficient in a key virulence gene failed to replicate, confirming model validity.
  • A typhoid toxin-deficient mutant showed increased replication, suggesting the toxin's role in establishing persistent infection.
  • Infected mice exhibited human innate and adaptive immune responses, including cytokine and antibody production.

Conclusions:

  • The developed humanized mouse model provides a valuable platform for studying Salmonella Typhi (S. Typhi) pathogenesis.
  • This model mimics human immune responses to S. Typhi, facilitating research into typhoid fever.
  • The model is expected to accelerate the evaluation of potential vaccine candidates against typhoid fever.