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Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
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Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
11:01

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Published on: November 23, 2016

An activation marker finds a function.

Diana M Mitchell1, Matthew A Williams

  • 1Department of Pathology, University of Utah, Salt Lake City, UT 84112, USA.

Immunity
|February 16, 2010
PubMed
Summary
This summary is machine-generated.

CD44 protein prevents T helper 1 (Th1) cell death during expansion. This allows activated Th1 cells to become memory cells, crucial for long-term immunity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Medicine

Background:

  • T helper 1 (Th1) effector cells are critical for adaptive immunity.
  • Fas-mediated apoptosis is a key mechanism for controlling immune responses.
  • The transition of effector cells to memory cells is vital for immunological memory.

Purpose of the Study:

  • To investigate the role of CD44 in regulating Th1 effector cell survival.
  • To understand how Th1 cells enter the memory pool after clonal expansion.
  • To elucidate the mechanism by which CD44 counteracts Fas-mediated apoptosis.

Main Methods:

  • Flow cytometry analysis of T cells.
  • Apoptosis assays to measure cell death.
  • Gene expression analysis to study CD44 function.

Main Results:

  • CD44 expression is maintained on Th1 effector cells during clonal expansion.
  • CD44 actively counteracts Fas-mediated apoptosis in Th1 cells.
  • Loss of CD44 function leads to increased apoptosis and impaired memory cell formation.

Conclusions:

  • CD44 plays a novel and essential role in preventing Th1 effector cell apoptosis.
  • CD44 facilitates the survival and differentiation of Th1 cells into the memory pool.
  • Targeting CD44 may offer therapeutic strategies for modulating immune memory.