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2014 ; 20
(2
): 359-65
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Ceramide and sphingosine-1-phosphate act as photodynamic therapy-elicited
damage-associated molecular patterns: cell surface exposure
#MMPMID24713544
Korbelik M
; Banáth J
; Sun J
; Canals D
; Hannun YA
; Separovic D
Int Immunopharmacol
2014[Jun]; 20
(2
): 359-65
PMID24713544
show ga
Molecules that appear on the surface of tumor cells after their therapy treatment
may have important roles either as damage-associated molecular patterns (DAMPs)
or signals for phagocytes influencing the disposal of these cells. Treatment of
SCCVII and CAL27 cells, models of mouse and human squamous cell carcinoma
respectively, by photodynamic therapy (PDT) resulted in the presentation of
ceramide and sphingosine-1-phosphate (S1P) on the cell surface. This was
documented by anti-ceramide and anti-S1P antibody staining followed by flow
cytometry. The exposure of these key sphingolipid molecules on PDT-treated tumor
cells was PDT dose-dependent and it varied in intensity with different
photosensitizers used for PDT. The above results, together with the finding that
both ceramide and S1P can activate NF?B signaling in macrophages co-incubated
with PDT-treated tumor cells, establish that these two sphingolipids can act as
DAMPs stimulating inflammatory/immune reactions critical for tumor therapy
response.