Triptolide promotes differentiation of human monocytes into immunosuppressive MDSCs.
Cell Immunol
; 401-402: 104836, 2024.
Article
in En
| MEDLINE
| ID: mdl-38776753
ABSTRACT
BACKGROUND:
Myeloid-derived suppressor cells (MDSCs) negatively modulate immune activity. Prior investigations have shown much promise in using MDSCs-assisted immunotherapy for organ transplantation patients. Additionally, owing to its immunosuppressive activity, MDSCs can also be used to manage immune-associated disorders.METHODS:
Granulocyte-macrophage colony-stimulating factor (GM-CSF) was employed to stimulate myeloid progenitor cell differentiation. Triptolide (PG490) was introduced toward the later phases of in vitro MDSCs induction. Lastly, real-time PCR (RT-PCR) and flow cytometry were used to assess transcript expression and cell phenotype, and a mouse skin transplantation model was established to evaluate the MDSCs-mediated immune suppression in vivo.RESULTS:
Co-stimulation with PG490 and GM-CSF potently induced myeloid-derived monocytes to form MDSCs, with remarkable immune-suppressive activity. The underlying mechanism involved downregulation of T cell proliferation, activation, enhancement of inflammatory cytokine release, as well as T cell conversion to Treg cells. PG490 strongly enhanced iNOS expression in MDSCs, and iNOS inhibition successfully reversed the immune-suppression. The PG490- and GM-CSF-induced MDSCs substantially extended survival duration of murine skin grafts, thereby validating their strong immune-suppressive activity in vivo.CONCLUSIONS:
Herein, we presented a new approach involving MDSCs-based immunosuppression in vitro. PG490 and GM-CSF co-treatment strongly induced immuno-suppressive activity in MDSCs both in vitro and in vivo. Our findings highlight the promise of applying MDSCs-based therapy in clinical organ transplantation treatment.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phenanthrenes
/
Monocytes
/
Cell Differentiation
/
Granulocyte-Macrophage Colony-Stimulating Factor
/
Diterpenes
/
Epoxy Compounds
/
Myeloid-Derived Suppressor Cells
Limits:
Animals
/
Humans
Language:
En
Journal:
Cell Immunol
Year:
2024
Document type:
Article
Affiliation country:
China