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Impaired B Cell Function in Mice Lacking Perforin-2.

Daniela Frasca1, Alain Diaz1, Maria Romero1

  • 1Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL, United States.

Frontiers in Immunology
|March 18, 2020
PubMed
Summary
This summary is machine-generated.

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Mice lacking perforin-2 (P2) exhibit heightened systemic inflammation and impaired antibody production due to uncontrolled gut bacteria. This chronic inflammation accelerates aging-like immune defects in B cells, impacting immune responses.

Area of Science:

  • Immunology
  • Microbiology
  • Genetics

Background:

  • Perforin-2 (P2) is a crucial pore-forming protein for defense against intracellular bacterial pathogens.
  • Mice lacking P2 (P2KO) are susceptible to infections due to impaired immune control.

Purpose of the Study:

  • To investigate the impact of P2 deficiency on systemic inflammation and B cell function.
  • To elucidate the mechanisms underlying impaired antibody responses in P2KO mice.

Main Methods:

  • Comparison of P2 knockout (P2KO) and wild-type (WT) mice.
  • Measurement of serum inflammatory markers.
  • Analysis of B cell populations, class switch recombination, and antibody production (in vivo and in vitro).

Main Results:

Keywords:
adipose tissue B cellsantibody responsesinflammationperforin-2splenic B cells

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  • P2KO mice display elevated systemic inflammation due to microbial translocation from the gut.
  • Systemic inflammation in P2KO mice leads to intrinsic B cell inflammation and impaired antibody responses.
  • Defects in class switch recombination, including reduced AID expression, contribute to diminished antibody production in P2KO mice.
  • P2 deficiency is associated with increased Age-associated B Cells (ABCs) in spleen and visceral adipose tissue (VAT), particularly in older mice.

Conclusions:

  • Perforin-2 deficiency results in chronic inflammation, impaired B cell function, and defective antibody responses.
  • The inflammatory state in P2KO mice may accelerate aging-related immune decline.
  • B cell differentiation into ABCs in VAT is enhanced in P2KO mice, suggesting a role in inflammation.