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Published on: April 11, 2025
IL-1beta-driven ST2L expression promotes maturation resistance in rapamycin-conditioned dendritic cells
Heth R Turnquist1, Tina L Sumpter, Allan Tsung
1Thomas E. Starzl Transplantation Institute and Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|June 21, 2008
Summary
Rapamycin (RAPA) conditions dendritic cells (DC) to resist maturation and promote tolerance. This involves de novo IL-1beta production, upregulating ST2L, which suppresses DC responsiveness to maturation signals.
Area of Science:
- Immunology
- Cell Biology
Background:
- Dendritic cells (DC) are key regulators of T cell responses.
- Rapamycin (RAPA) confers maturation resistance and tolerogenic properties on DC.
- Mechanisms for RAPA-induced DC unresponsiveness are not fully understood.
Purpose of the Study:
- To elucidate the molecular mechanisms by which RAPA conditions DC to become unresponsive to maturation stimuli.
- To investigate the role of IL-1beta and ST2 in RAPA-mediated DC tolerogenicity.
Main Methods:
- In vitro and in vivo conditioning of murine myeloid DC with RAPA.
- Analysis of IL-1beta production and ST2L expression in RAPA-conditioned DC (RAPA-DC).
- Assessment of costimulatory molecule expression (CD86) and responsiveness to TLR/CD40 ligation in RAPA-DC from wild-type and ST2-/- mice.
Main Results:
- RAPA conditioning induced de novo IL-1beta production in immature DC.
- IL-1beta promoted overexpression of ST2L on RAPA-DC.
- ST2L upregulation suppressed RAPA-DC responsiveness to TLR or CD40 ligation.
- RAPA-DC from ST2-/- mice showed higher CD86 levels than wild-type RAPA-DC.
Conclusions:
- RAPA-conditioned DC upregulate ST2L via IL-1beta production, rendering them refractory to maturation stimuli.
- This identifies a novel mechanism for immunosuppression by RAPA, impacting DC maturation and T cell responses.
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