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Related Experiment Videos

Alpha(4)beta(7)/alpha(4)beta(1) dual integrin antagonists block alpha(4)beta(7)-dependent adhesion under shear flow.

Linda A Egger1, Usha Kidambi, Jin Cao

  • 1Pharmacology Division, Merck, PO Box 2000, RY8ON-A26, Rahway, NJ 07065, USA. linda_egger@merck.com

The Journal of Pharmacology and Experimental Therapeutics
|June 18, 2002
PubMed
Summary

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Dual antagonists targeting alpha(4)beta(1) and alpha(4)beta(7) integrins effectively blocked lymphocyte adhesion to MAdCAM-1 on high endothelial venules. These compounds show promise for modulating immune cell trafficking to the gastrointestinal tract.

Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • Alpha(4) integrins, specifically alpha(4)beta(7), are crucial for lymphocyte homing to the gastrointestinal tract via binding to MAdCAM-1 on high endothelial venules (HEVs).
  • Dysregulation of this interaction is implicated in inflammatory conditions affecting the gut.

Purpose of the Study:

  • To evaluate the efficacy of dual alpha(4)beta(1) and alpha(4)beta(7) integrin antagonists (TR14035 and compound 1) in blocking lymphocyte adhesion to MAdCAM-1.
  • To assess the in vitro and in vivo performance of these antagonists under shear flow conditions.

Main Methods:

  • In vitro assays measuring the inhibition of alpha(4)beta(7) binding to MAdCAM-Ig by TR14035 and compound 1.
  • In vitro shear flow assays using human and murine cells expressing alpha(4)beta(7) or alpha(4)beta(1).

Related Experiment Videos

  • In vivo intravital microscopy to quantify alpha(4)-dependent lymphocyte adhesion in murine Peyer's patch HEVs.

    • Main Results:

    • TR14035 and compound 1 demonstrated potent inhibition of alpha(4)beta(7) binding to MAdCAM-Ig (IC50 values of 0.75 nM and 2.93 nM, respectively).
    • Both compounds effectively blocked lymphocyte adhesion under in vitro shear flow conditions.
    • TR14035 significantly inhibited alpha(4)beta(7)-dependent lymphocyte adhesion to HEVs in vivo (ED50 of 0.01-0.1 mpk), while compound 1 showed partial inhibition.

    Conclusions:

    • Dual alpha(4)beta(1)/alpha(4)beta(7) antagonists are effective in blocking alpha(4)beta(7)-mediated lymphocyte adhesion to HEVs.
    • These findings support the therapeutic potential of such antagonists in managing immune cell trafficking to the gut.
    • The study highlights the importance of alpha(4)beta(7) in lymphocyte recruitment to the gastrointestinal tract under shear flow conditions.