Treg-derived TGF-ß1 dampens cGAS-STING signaling to downregulate the expression of class I MHC complex in multiple myeloma.
Sci Rep
; 14(1): 11593, 2024 05 21.
Article
in En
| MEDLINE
| ID: mdl-38773213
ABSTRACT
Multiple myeloma (MM) progression involves diminished tumor antigen presentation and an immunosuppressive microenvironment, characterized by diminished expression of major histocompatibility complexes (MHC) class I molecule and elevated programmed death ligand 1 (PDL1) in MM cells, along with an enriched population of regulatory T cells (Tregs). To investigate Treg's influence on MM cells, we established a co-culture system using Tregs from MM patients and the MM cell lines (MM.1S and SK-MM-1) in vitro and assessed the effects of intervening in the relevant pathways connecting Tregs and MM cells in vivo. In vitro, Tregs induced transforming growth factor beta-1 (TGF-ß1) production, downregulated MHC I members, and increased PDL1 expression in MM cells. Treg-derived TGF-ß1 suppressed the cGAS-STING pathway, contributing to the loss of MHC I molecule expression and PDL1 upregulation. Correspondingly, neutralizing TGF-ß1 or activating the cGAS-STING pathway restored MHC I and PDL1 expression, effectively countering the pro-tumorigenic effect of Tregs on MM cells in vivo. These data elucidated how Tregs influence tumor antigen presentation and immunosuppressive signal in MM cells, potentially providing therapeutic strategies, such as neutralizing TGF-ß1 or activating the cGAS-STING pathway, to address the immune escape and immunosuppressive dynamics in MM.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Histocompatibility Antigens Class I
/
Signal Transduction
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T-Lymphocytes, Regulatory
/
Transforming Growth Factor beta1
/
B7-H1 Antigen
/
Membrane Proteins
/
Multiple Myeloma
/
Nucleotidyltransferases
Limits:
Animals
/
Female
/
Humans
/
Male
Language:
En
Journal:
Sci Rep
Year:
2024
Document type:
Article
Affiliation country:
China
Country of publication:
United kingdom