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Related Experiment Video

Updated: Dec 21, 2025

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Tetraspanin CD53 Promotes Lymphocyte Recirculation by Stabilizing L-Selectin Surface Expression.

Maria C Demaria1, Louisa Yeung2, Rens Peeters3

  • 1Department of Immunology and Pathology, Monash University, Alfred Research Alliance, Melbourne, VIC 3004, Australia.

Iscience
|May 20, 2020
PubMed
Summary
This summary is machine-generated.

The tetraspanin CD53 is crucial for lymphocyte recirculation, enabling immune cells to travel to lymph nodes. Its absence impairs immune responses by affecting cell trafficking and L-selectin stability.

Keywords:
Immune ResponseImmunologyMolecular Mechanism of BehaviorSpecialized Functions of Cells

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Tetraspanins are cell surface proteins involved in immune cell function.
  • The specific role of CD53, a leukocyte-restricted tetraspanin, in immune cell processes remains largely unknown.

Purpose of the Study:

  • To investigate the function of CD53 in lymphocyte recirculation and immune responses.
  • To elucidate the molecular mechanisms by which CD53 influences lymphocyte homing.

Main Methods:

  • Analysis of lymph node cellularity and lymphocyte populations in Cd53 knockout (Cd53-/-) mice.
  • Assessment of L-selectin expression and stability on lymphocytes from Cd53-/- and wild-type mice.
  • Investigation of CD53's role in regulating L-selectin shedding in both mouse and human lymphocytes.

Main Results:

  • Cd53-/- mice exhibited smaller lymph nodes with significantly reduced B and T cell numbers.
  • Cd53-/- lymphocytes showed impaired homing to lymph nodes, linked to L-selectin deficiency or instability.
  • CD53 was found to stabilize L-selectin surface expression and inhibit its shedding through both ADAM17-dependent and -independent pathways.
  • Disrupted lymphocyte recirculation in Cd53-/- mice resulted in compromised immune responses.

Conclusions:

  • CD53 plays an essential role in regulating lymphocyte recirculation by stabilizing L-selectin.
  • The findings highlight CD53 as a key regulator of lymphocyte trafficking and overall immune function.