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Methyldopa, an existing blood pressure drug, effectively blocks the disease-specific HLA-DQ8 molecule implicated in type 1 diabetes (T1D). This targeted approach reduces autoimmune responses in T1D patients, offering a personalized medicine strategy.

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Area of Science:

  • Immunology
  • Endocrinology
  • Pharmacology

Background:

  • Type 1 Diabetes (T1D) is an autoimmune disease primarily driven by genetic predisposition, with Human Leukocyte Antigen (HLA) genes conferring significant risk.
  • The HLA-DQ8 molecule, present in 50-60% of T1D patients, plays a critical role by presenting disease-relevant peptides to T cells, leading to pancreatic islet destruction.

Purpose of the Study:

  • To review recent findings on small molecule compounds that can block disease-specific HLA molecules in Type 1 Diabetes.
  • To investigate the potential of targeting HLA-DQ8 with 'drug-like' compounds as a therapeutic strategy for T1D.

Main Methods:

  • Structure-based drug design was employed to assess the 'druggability' of the HLA-DQ8 molecule.
  • Methyldopa, an established oral antihypertensive, was identified as a compound that binds to HLA-DQ8.
  • A proof-of-concept clinical trial (NCT01883804) was conducted in recent-onset T1D patients carrying the DQ8 gene.

Main Results:

  • Methyldopa demonstrated the ability to bind HLA-DQ8 and block the activation of DQ8-specific T cells responding to self-antigens like insulin.
  • The clinical trial confirmed methyldopa's mechanism of action in T1D patients, showing a diminished inflammatory T cell response towards insulin.
  • The drug's effect was specific to disease-relevant antigens, not affecting responses to unrelated antigens like influenza.

Conclusions:

  • Methyldopa effectively blocks the disease-specific function of HLA-DQ8, representing a personalized medicine approach for T1D autoimmunity.
  • Further clinical trials are warranted to evaluate methyldopa's potential in preserving residual beta-cell function in new-onset and at-risk T1D individuals.