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Related Experiment Videos

Antigen recognition by CTL is dependent upon ectoATPase activity

K E Dombrowski1, Y Ke, L F Thompson

  • 1Department of Veterans Affairs Medical Center, Amarillo, TX, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|June 15, 1995
PubMed
Summary
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Cytotoxic T lymphocytes (CTL) utilize ecto-ATPase for antigen recognition and effector functions. Inhibiting this enzyme blocks CTL killing and cytokine secretion, highlighting its essential role in adaptive immunity.

Area of Science:

  • Immunology
  • Cellular Biology
  • Biochemistry

Background:

  • CD8+ cytotoxic T lymphocytes (CTL) are crucial for adaptive immunity.
  • Extracellular nucleotide metabolism plays a role in immune cell function.
  • The specific role of ecto-ATPases in CTL activity was previously unclear.

Purpose of the Study:

  • To investigate the expression and function of ecto-nucleotidases in CD8+ CTL.
  • To determine the role of ecto-ATPase in CTL-mediated killing and cytokine production.
  • To elucidate the mechanism by which ecto-ATPase influences CTL activation.

Main Methods:

  • Characterization of ecto-nucleotidase activity (ectoATPase, ectoADPase, ectoAMPase) in CTL.
  • Assessment of adenosine uptake by CTL.

Related Experiment Videos

  • Inhibition of ecto-ATPase using 5'-p-(fluorosulfonyl)benzoyl adenosine (5'-FSBA) and non-hydrolyzable ATP analogues.
  • Measurement of CTL-mediated cytotoxicity and cytokine (TNF-α, IFN-γ) secretion.
  • Analysis of the effect of ADP on 5'-FSBA-induced inhibition.

    • Main Results:

    • CTL express ecto-ATPase and ecto-ADPase, but not ecto-AMPase.
    • Adenosine uptake is primarily mediated by nucleoside transporters, not nucleotide salvage.
    • Inhibition of ecto-ATPase with 5'-FSBA rendered CTL unable to kill target cells and secrete cytokines.
    • Non-hydrolyzable ATP analogues, but not ATP, ADP, or AMP, inhibited CTL activity.
    • ADP addition did not reverse 5'-FSBA-induced inhibition, suggesting ATP hydrolysis is key.

    Conclusions:

    • Ecto-ATPase is essential for antigen recognition and/or effector functions of CD8+ CTL.
    • ATP hydrolysis by ecto-ATPase provides a critical signal for CTL activation.
    • Targeting CTL ecto-ATPase may represent a novel immunomodulatory strategy.