PTG
  • Home
  • Research
    • PTG Research
    • iBox technology
    • Publications
    • Collaborations
    • Granted Projects
    • Awards
    • Database access
  • Platforms
    • Technical & Analytical Platforms
  • Team
    • Current team
    • PTG alumni
  • News & Media
    • Latest news
    • Photo and Video Gallery
    • PTG in the media
  • Job offers
  • About

ISHLT 2016 Annual Meeting & Scientific Sessions

4/30/2016

 
Picture

Plenary session - Saturday April 30, 2016 - 10:55
Pushing New Scientific Frontiers: It’s In Our Heritage

Precision Medicine in Organ Transplantation: Moving from Off the Rack to Bespoke, Alexandre Loupy, MD, PhD, Necker Hospital, Paris, France

Abstracts -Thursday April 28, 2016 - 11:45
Molecular Correlates of Endothelial mTOR Activation in Heart Transplant Recipients

Authors
M. Racapé, A. Loupy, J. Reeve, J. Venner, R. Guillemain, L. Hidalgo, C. Lefaucheur, X. Jouven, P. Bruneval, J. Duong Van Huyen, P. Halloran. 

Abstract
  • Purpose: The detection of phosphorylated effectors of the mTOR pathway in endothelial cells by immunohistochemistry (IHC) has been associated with allograft rejection. The aim of this study was to evaluate in heart transplant recipients the molecular phenotype related to the endothelial detection of the phosphorylated effectors of the mTOR pathway, pS6RP.
  • Methods: This case-control study included 41 heart transplant patients from four French referral centers with biopsy proven antibody-mediated rejection (pAMR+) and a matched control group of 32 patients without rejection (pAMR0) based on the updated ISHLT classification. From these patients, 93 endomyocardial biopsies (EMB) had adequate material for microarray analysis and IHC. We studied in all EMB the endothelial expression of pS6RP by IHC. We also determined the allograft gene expression profile using the ABMR molecular score in addition to pathogenesis-based transcripts reflecting endothelial activation (DSAST and ENDAT), macrophage burden (QCMAT), gamma-interferon response (GRIT) and NK-cell burden (NKB) (http://atagc.med.ualberta.ca).
  • Results: Among the 93 EMBs included in main analyses, 49 were pAMR+ (52.7%) and 44 (47.3%) were pAMR0 normal EMBs. Endothelial expression of pS6RP was observed in 27/49 (55.1%) of pAMR+ biopsies and 12 out of 44 normal biopsies (27.3%, Fischer's exact: p=0.011). As compared with biopsies without endothelial pS6RP labeling, biopsies with positive endothelial pS6RP staining showed increased expression in DSAST (Mann-Whitney: p<0.0001), ENDAT (p=0.0008), QCMAT (p=0.0052), NKB (p=0.0001) and increased ABMR molecular score reflecting interferon-effects, microcirculation stress and NK burden (p=0.0001).
  • Conclusion: Endothelial activation of mTOR pathway is associated with antibody-mediated allograft rejection and increased expression in transcripts reflecting endothelial activation, macrophage burden, microcirculation and NK burden. Our results suggest the importance of the mTOR pathway activation in antibody-mediated heart allograft injury and the potential interest of using mTOR inhibitors in this setting.

    Paris Transplant Group

    Our global aim is to accelerate the translation of immunological and gene expression discoveries into the clinical field by filling the gap between basic science and applied biomedical researches.

    CATEGORIES

    Awards
    Events
    Job offers
    Press Releases
    Publications

    See also

    Press coverage
    Video and ​Picture gallery

    ALl

    All
    Alexandre Loupy
    Antoine Bouquegneau
    Antoine Durrbach
    Antoine Roux
    Awards
    Blaise Robin
    Carmen Lefaucheur
    Charlotte Debiais
    Charlotte Loheac
    Christophe Legendre
    Daniel Yoo
    Dany Anglicheau
    Denis Glotz
    Denis Viglietti
    Dina Zielinski
    Elodie Bailly
    Events
    Gillian Divard
    Guillaume Bonnet
    Guillaume Coutance
    Huanxi Zhang
    Jean Luc Taupin
    Jean Paul Duong Van Huyen
    Jean Philippe Empana
    Jessy Dagobert
    Job
    Juliette Gueguen
    Kevin Louis
    Marc Raynaud
    Marie-Cécile Bories
    Marion Rabant
    Maud Racape
    Michel Delahousse
    Olivier Aubert
    Pascal Leprince
    Patrick Bruneval
    Peter Reese
    Press Releases
    Publications
    Shaida Varnous
    Valentin Goutaudier
    Xavier Jouven
    Yassine Bouatou
    Zeynep Demir

    Archives

    October 2021
    September 2021
    August 2021
    July 2021
    February 2021
    January 2021
    December 2020
    November 2020
    October 2020
    September 2020
    August 2020
    July 2020
    May 2020
    March 2020
    January 2020
    December 2019
    October 2019
    September 2019
    August 2019
    June 2019
    May 2019
    March 2019
    February 2019
    December 2018
    September 2018
    May 2018
    February 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    June 2016
    April 2016
    October 2015
    June 2015
    August 2014
    January 2014
    September 2013
    January 2013
    June 2011
    August 2010
    May 2009

    RSS Feed

Paris Transplant Group

About PTG
PTG Team
​​Careers at PTG
​Latest News
​
Awards
Video and Picture Gallery

PTG in the Press
​Contact us

Research

iBox technology
PTG Research
PTG Publications
Covid-related research 🔓

Platforms

Technical platforms

Partnerships

Research collaborations
​Database access
​

Search

LEGAL NOTICE AND PRIVACY POLICY
© COPYRIGHT 2022. ALL RIGHTS RESERVED.

 LABS EXPLORER for the PARIS TRANSPLANT GROUP.
  • Home
  • Research
    • PTG Research
    • iBox technology
    • Publications
    • Collaborations
    • Granted Projects
    • Awards
    • Database access
  • Platforms
    • Technical & Analytical Platforms
  • Team
    • Current team
    • PTG alumni
  • News & Media
    • Latest news
    • Photo and Video Gallery
    • PTG in the media
  • Job offers
  • About