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Structural and Functional Changes in the Mesenteric Lymph Nodes in Humans during Aging.

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|April 6, 2020
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Aging significantly alters human mesenteric lymph nodes, leading to reduced immune cell function and impaired lymph flow. These changes suggest a decline in immune surveillance and potential autoimmune complications with age.

Keywords:
age-related involutionagingimmune systemimmunomorphologymesenteric lymph nodes

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Area of Science:

  • Immunology
  • Gerontology
  • Anatomy

Background:

  • The human mesenteric lymph nodes play a crucial role in immune surveillance of the gastrointestinal tract.
  • Aging is associated with complex changes in immune function, termed immunosenescence.

Purpose of the Study:

  • To investigate the structural and functional alterations in human mesenteric lymph nodes during the aging process.
  • To understand the impact of these changes on immune cell populations and lymph node function.

Main Methods:

  • Morphometric analysis of human mesenteric lymph node tissues.
  • Immunohistochemical staining to identify specific cell populations (e.g., Ki-67, CD4).

Main Results:

  • Observed development of fibrous connective tissue and fragmentation of lymphoid parenchyma.
  • Absence of lymphoid follicles with germinal centers and decreased lymphocyte proliferation (Ki-67 negative).
  • Depletion of CD4+ T helper cells in the paracortical zone and accumulation of plasma cells and eosinophils.

Conclusions:

  • Aging leads to significant structural and functional degradation of mesenteric lymph nodes.
  • These changes compromise immune cell regulation, potentially contributing to autoimmune processes and reduced lymph filtration capacity.