Coccomyxa sp.KJ extract affects the fate of T cells stimulated by toxic shock syndrome toxin-1, a superantigen secreted by Staphylococcus aureus.
Microbiol Immunol
; 66(8): 394-402, 2022 Aug.
Article
in En
| MEDLINE
| ID: mdl-35543108
ABSTRACT
T cell stimulation by bacterial superantigens induces a cytokine storm. After T cell activation and inflammatory cytokine secretion, regulatory T cells (Treg) are produced to suppress the immune response. Coccomyxa sp.KJ (IPOD FERM BP-22254), a green alga, is reported to regulate immune reactions. Therefore, we examined the effects of Coccomyxa sp.KJ extract (CE) on the superantigen-induced immune response. When human peripheral blood mononuclear cells (PBMCs) were stimulated with toxic shock syndrome-1 (TSST-1) in the presence of CE, the number of activated T cells decreased moderately. Purified T cells stimulated in the presence of CE comprised more non-proliferating cells than those stimulated in the absence of CE, whereas some T cells proliferated more quickly. The levels of activation markers on the stimulated T cells increased in the presence of CE. Most of the inflammatory cytokines did not change but IL-1ß, IL-17, IL-4, and IL-13 secretion increased, whereas that of IL-2, TNF-α, and IL-18 decreased. IL-10 secretion was also decreased by CE treatment, suggesting that the immune response was not suppressed by Treg cells. CE enhanced the expression of stem cell-like memory cell markers in T cells. These results suggest that CE can regulate the fate of T cells and can help to ameliorate superantigen-induced T cell hyperactivation and immune suppression.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Staphylococcal Infections
/
Chlorophyta
Limits:
Humans
Language:
En
Journal:
Microbiol Immunol
Year:
2022
Document type:
Article
Affiliation country: