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Treg suppress CTL responses upon immunization with HSP gp96.

Zhen Liu1, Xinghui Li, Lipeng Qiu

  • 1CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, PR China.

European Journal of Immunology
|October 20, 2009
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Heat shock protein gp96 (HSP gp96) adjuvant therapy shows dose-dependent effects on T cell and regulatory T cell (Treg) activity. Low doses stimulate beneficial T cell responses, while high doses can suppress them, necessitating strategies to restore efficacy.

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Area of Science:

  • Immunology
  • Vaccinology
  • Oncology

Background:

  • Heat shock protein gp96 (HSP gp96) is a key molecule in immune responses.
  • HSP gp96-based vaccines are being investigated for cancer and infectious disease treatment.
  • Understanding gp96's immunomodulatory role is crucial for vaccine design.

Purpose of the Study:

  • To investigate the dose-dependent effects of gp96 as an adjuvant on T cell and regulatory T cell (Treg) activity in mice.
  • To explore strategies for optimizing gp96-based vaccine efficacy.

Main Methods:

  • Immunization of BALB/c mice with varying doses of gp96.
  • Monitoring of cytotoxic T lymphocyte (CTL) and Treg cell activity.
  • Assessment of tumor rejection following gp96 or N355 peptide administration.
  • Evaluation of low-dose cyclophosphamide treatment to restore T cell responses.

Main Results:

  • Co-injection of gp96 stimulated both CTL and Treg activity.
  • Low gp96 doses preferentially activated CTLs, while high doses increased Treg activity and suppressed T cell responses.
  • Low-dose cyclophosphamide restored T cell responses inhibited by high-dose gp96.
  • Dose-dependent effects of gp96 and N355 peptide were observed on tumor rejection.

Conclusions:

  • HSP gp96 dosage critically influences the balance between effector and regulatory T cells.
  • High-dose gp96 can induce immunosuppression via Treg activation, hindering therapeutic vaccine potential.
  • Targeted modulation of Treg activity, such as with low-dose cyclophosphamide, can overcome gp96-induced suppression.
  • These findings offer insights for developing more effective gp96-based therapeutic vaccines.