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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Br+J+Cancer
2014 ; 111
(10
): 1945-54
Nephropedia Template TP
gab.com Text
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English Wikipedia
Direct incorporation of the NKT-cell activator ?-galactosylceramide into a
recombinant Listeria monocytogenes improves breast cancer vaccine efficacy
#MMPMID25314062
Singh M
; Quispe-Tintaya W
; Chandra D
; Jahangir A
; Venkataswamy MM
; Ng TW
; Sharma-Kharkwal S
; Carreņo LJ
; Porcelli SA
; Gravekamp C
Br J Cancer
2014[Nov]; 111
(10
): 1945-54
PMID25314062
show ga
BACKGROUND: Immune suppression in the tumour microenvironment remains a major
limitation to successful immunotherapy of cancer. In the current study, we
analysed whether the natural killer T cell-activating glycolipid
?-galactosylceramide could overcome immune suppression and improve vaccination
against metastatic breast cancer. METHODS: Mice with metastatic breast cancer
(4T1 model) were therapeutically treated with a Listeria monocytogenes-based
vaccine expressing tumour-associated antigen Mage-b followed by
?-galactosylceramide as separate agents, or as a complex of ?-galactosylceramide
stably incorporated into Listeria-Mage-b. Effects on metastases, tumour weight,
toxicity and immune responses were determined. RESULTS: Sequential treatments of
mice with established 4T1 breast carcinomas using Listeria-Mage-b followed by
?-galactosylceramide as a separate agent was highly effective at reducing
metastases, but was accompanied by severe liver toxicity. In contrast, combined
therapy using Listeria-Mage-b modified by incorporation of ?-galactosylceramide
resulted in nearly complete elimination of metastases without toxicity. This was
associated with a significant increase in the percentage of natural killer T
cells in the spleen, and an increase in natural killer cell activity and in T
cell responses to Mage-b. CONCLUSIONS: Our results suggest that direct
incorporation of ?-galactosylceramide into a live bacterial vaccine vector is a
promising non-toxic new approach for the treatment of metastatic breast cancer.