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Updated: Apr 5, 2026

Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
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2-Methoxyestradiol: A Hormonal Metabolite Modulates Stimulated T-Cells Function and proliferation

J G Y Luc1, R Paulin2, J Y Zhao1

  • 1Division of Cardiac Surgery, Department of Surgery, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada; Mazankowski Alberta Heart Institute, Edmonton, Alberta, Canada.

Transplantation Proceedings
|August 22, 2015
PubMed
Abstract

Insights

2-Methoxyestradiol (2ME2), an estrogen metabolite, inhibits T-cell proliferation without inducing apoptosis or senescence. This suggests 2ME2 could be a safe oral immunomodulatory therapy for transplant patients.

Area of Science:

  • Immunology
  • Endocrinology
  • Pharmacology

Background:

  • 2-Methoxyestradiol (2ME2) is a nonestrogenic endogenous estrogen metabolite.
  • It exhibits antimitotic properties, selectively targeting cancer cells without harming normal cells.
  • Its effects on transplant rejection and T-cell function were previously unknown.

Purpose of the Study:

  • To investigate the potential of 2ME2 in modulating T-cell responses in the context of transplant rejection.
  • To test the hypothesis that 2ME2 can inhibit stimulated T-cell function.

Main Methods:

  • Human peripheral blood mononuclear cells (PBMCs) were treated with 2ME2 prior to stimulation.
  • Assays included enzyme-linked immunosorbent assays (ELISAs), Western immunoblotting, proliferation assays, and flow cytometry for apoptosis and senescence.
  • Caspase-9 activity was also assessed.

Main Results:

  • 2ME2 treatment modestly reduced TNF-α and IFN-γ cytokine production in stimulated PBMCs.
  • T-cell proliferation was significantly blunted by 2ME2.
  • A decrease in apoptosis correlated with reduced caspase-9 activity, and 2ME2 blocked stress-induced senescence.

Conclusions:

  • 2ME2 effectively blunts stimulated T-cell proliferation without inducing apoptosis or senescence.
  • T-cells treated with 2ME2 maintain normal cytokine production levels.
  • 2ME2 shows promise as an oral immunomodulatory adjunct therapy for transplantation with a favorable side effect profile.

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