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Related Concept Videos

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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PD-1 regulates KLRG1+ group 2 innate lymphoid cells.

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  • 1Experimental Transplantation Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.

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Programmed cell death protein 1 (PD-1) negatively regulates group 2 innate lymphoid cells (ILC-2s). PD-1 deficiency enhances ILC-2 function and reduces parasitic infection burden, highlighting PD-1

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Area of Science:

  • Immunology
  • Cell Biology
  • Infectious Disease

Background:

  • Group 2 innate lymphoid cells (ILC-2s) are crucial for immune responses and tissue homeostasis.
  • ICOS is a known positive regulator of ILC-2s.
  • The role of PD-1 in ILC-2 regulation was previously unclear.

Purpose of the Study:

  • To investigate the function of Programmed cell death protein 1 (PD-1) as a regulator of KLRG1+ ILC-2s.
  • To determine the impact of PD-1 signaling on ILC-2 numbers and function in vivo.
  • To explore the therapeutic potential of targeting PD-1 in parasitic infections.

Main Methods:

  • Utilized knockout mouse models (Pdcd1-/-) to study PD-1 deficient ILC-2s.
  • Employed adoptive transfer experiments with ILC-2s.
  • Administered anti-PD-1 antibodies to assess in vivo effects.
  • Analyzed STAT5 activation in ILC-2s.

Main Results:

  • PD-1 acts as a negative regulator of KLRG1+ ILC-2 function in both mice and humans.
  • PD-1 deficiency leads to increased KLRG1+ ILC-2 numbers due to enhanced STAT5 activation.
  • Pdcd1-/- mice exhibited significant expansion of KLRG1+ ILC-2s during Nippostrongylus brasiliensis infection.
  • Adoptive transfer of Pdcd1-/- ILC-2s reduced worm burden, and PD-1 blockade decreased disease severity.

Conclusions:

  • PD-1 is essential for maintaining the appropriate number and function of KLRG1+ ILC-2s.
  • Targeting PD-1 represents a potential therapeutic strategy for parasitic infections mediated by ILC-2s.