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Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes
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Tet2 modulates ER stress responses related to β-cell death and autoimmunity in diabetes

Jinxiu Rui1, Madhav Kothari2, Romy Kursawe2

  • 1Department of Immunobiology, New Haven, CT, USA.

Iscience
|March 5, 2026
PubMed

Insights

Tetraplegin-2 (TET2) deficiency protects beta cells from autoimmune Type 1 diabetes by reducing inflammatory T-cells and modulating ER stress responses. This finding offers new insights into beta cell protection mechanisms in autoimmune settings.

Area of Science:

  • Immunology
  • Endocrinology
  • Molecular Biology

Background:

  • Beta cells are crucial for glucose regulation and are targeted in Type 1 diabetes.
  • Tetraplegin-2 (TET2) has been implicated in immune regulation, but its role in beta cell protection during autoimmune diabetes is unclear.

Purpose of the Study:

  • To elucidate the mechanism by which TET2 deficiency protects beta cells in a Type 1 diabetes model.
  • To investigate the impact of TET2 loss on immune cell infiltration and beta cell stress responses.

Main Methods:

  • Utilized Tet2-deficient NOD mice transplanted with wild-type bone marrow to study immune cell infiltration.
  • Analyzed transcription factor binding motifs in Tet2-responsive cis-regulatory elements.
  • Investigated the effects of TET2 inhibition on human islets under endoplasmic reticulum (ER) stress conditions induced by brefeldin A or thapsigargin.

Main Results:

  • Tet2 deficiency led to reduced islet-infiltrating lymphocytes, particularly CD4+ T-cells, in NOD mice.
  • Beta cell-specific enrichment of transcription factors involved in homeostatic and ER stress pathways was observed in Tet2-deficient islets.
  • Pharmacologic inhibition of TET2 in human islets reduced ER stress response genes, inflammatory responses, and stress-induced beta cell death.

Conclusions:

  • TET2 plays a role in regulating ER stress responses that contribute to beta cell death in autoimmune and inflammatory conditions.
  • TET2 inhibition may represent a therapeutic strategy for protecting beta cells in Type 1 diabetes.
Keywords:
cell biologyimmunologymolecular biology

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