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Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

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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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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
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Related Experiment Video

Updated: Sep 21, 2025

Isolation, Fixation and Characterization of Juvenile Gilthead Seabream Head Kidney Leukocytes by Flow Cytometry
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Lympho-Hematopoietic Microenvironments and Fish Immune System.

Agustín G Zapata1,2

  • 1Department of Cell Biology, Faculty of Biology, Complutense University of Madrid, 28040 Madrid, Spain.

Biology
|May 28, 2022
PubMed
Summary
This summary is machine-generated.

Fish immune system research has advanced, yet cellular details remain scarce. This review explores fish immune cell origins, thymus organization, and memory without germinal centers.

Keywords:
MALTT and B lymphocytesgerminal centers and immune memoryimmunityperipheral lymphoid organsteleost fishthymus

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Area of Science:

  • Immunology
  • Comparative immunology
  • Fish biology

Background:

  • Significant advancements in understanding the fish immune system over 50 years, focusing on commercially important species, phylogenetically key groups, and model organisms.
  • Most existing knowledge relies on genetic sequencing, with limited understanding of the cellular basis of immune responses in fish.
  • While fish possess thymus and bone marrow equivalents, the relationship between these microenvironments and immune capabilities is understudied.

Purpose of the Study:

  • To review the origins of T and B lymphopoiesis in jawless (Agnatha) and jawed fish.
  • To analyze the unique organization of the thymus in teleost fish.
  • To discuss the diverse organs involved in lympho-hematopoietic progenitor housing and potential B lymphopoiesis.
  • To examine the presence of immunological memory in fish despite the absence of germinal centers.

Main Methods:

  • Literature review and synthesis of existing research on fish immunology.
  • Comparative analysis of immune system components across different fish taxa.
  • Focus on cellular and microenvironmental aspects of immune responses.

Main Results:

  • Detailed examination of T and B lymphopoiesis origins in various fish groups.
  • Description of the specialized architecture of the teleost thymus.
  • Identification of multiple organs potentially supporting lympho-hematopoietic cell development.
  • Evidence for immunological memory in fish lacking germinal centers.

Conclusions:

  • The fish immune system exhibits unique cellular organization and developmental pathways.
  • Understanding these cellular microenvironments is crucial for comprehending fish immune function.
  • Fish possess sophisticated immune mechanisms, including memory, despite structural differences from mammals.