About: Thymic T-Cell Selection     Goto   Sponge   NotDistinct   Permalink

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AttributesValues
rdf:type
rdfs:label
  • Thymic T-Cell Selection
rdfs:subClassOf
Semantic_Type
  • Cell Function
Preferred_Name
  • Thymic T-Cell Selection
UMLS_CUI
  • C1515433
Legacy_Concept_Name
  • Thymocyte_Selection
FULL_SYN
  • Thymic T-Cell SelectionPTNCI
  • Thymocyte SelectionSYNCI
DEFINITION
  • Bone marrow-derived stem cells in the thymus become educated to recognize complexes of self-major histocompatibility complex (MHC) molecules plus self-peptides in a process called positive selection under the influence of epithelial cells in the thymic cortex. Positively-selected thymic T cell precursors (thymocytes) then progress through a process called negative selection under the influence of bone marrow-derived dendritic cells at the corticomedullary junction where self-reactive, and potentially autoimmunity-inducing, thymocytes are deleted. Thymocytes simultaneously progress through phases expressing both CD4 and CD8 coreceptors to a single positive stage expressing only CD4 or CD8 in addition to the T cell receptor. They are then allowed to leave the thymus and enter the periphery via the lymphatics or venules of the circulatory system as mature T cells.NCI
code
  • C19064
is someValuesFrom of
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