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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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NOD2 regulates hematopoietic cell function during graft-versus-host disease.

Olaf Penack1, Odette M Smith, Amy Cunningham-Bussel

  • 1Department of Immunology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.

The Journal of Experimental Medicine
|September 10, 2009
PubMed
Summary

Nucleotide-binding oligomerization domain 2 (NOD2) deficiency in host cells worsens graft-versus-host disease (GVHD) and intestinal inflammation. NOD2 regulates antigen-presenting cell function, impacting T cell activation in transplantation and inflammatory conditions.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Transplantation Science

Background:

  • Nucleotide-binding oligomerization domain 2 (NOD2) is linked to Crohn's disease and graft-versus-host disease (GVHD).
  • NOD2 mutations in Crohn's disease correlate with impaired enterocyte antibacterial function.
  • The role of NOD2 in experimental allogeneic bone marrow transplantation (allo-BMT) remains uninvestigated.

Purpose of the Study:

  • To investigate the role of NOD2 in host hematopoietic cells during experimental allo-BMT and GVHD.
  • To determine NOD2's impact on T cell activation and antigen-presenting cell (APC) function in GVHD.
  • To assess NOD2's role in experimental colitis.

Main Methods:

  • Utilized chimeric recipients with NOD2-deficient (NOD2(-/-)) hematopoietic cells in allo-BMT models.
  • Analyzed donor T cell proliferation and activation in NOD-deficient recipients.
  • Employed bone marrow chimeras in an experimental colitis model to assess intestinal inflammation.

Main Results:

  • NOD2 deficiency in host hematopoietic cells significantly exacerbated GVHD.
  • Enhanced proliferation and activation of donor T cells were observed in NOD-deficient allo-BMT recipients.
  • NOD2 deficiency in hematopoietic cells led to increased intestinal inflammation in a colitis model.

Conclusions:

  • NOD2 plays a critical inhibitory role in regulating host antigen-presenting cell (APC) function.
  • NOD2 deficiency in hematopoietic cells promotes GVHD development and intestinal inflammation.
  • NOD2 is a key regulator in the pathogenesis of GVHD and inflammatory bowel diseases.