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2017 ; 12
(9
): e0184852
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Fractional laser exposure induces neutrophil infiltration (N1 phenotype) into the
tumor and stimulates systemic anti-tumor immune response
#MMPMID28922374
Kawakubo M
; Demehri S
; Manstein D
PLoS One
2017[]; 12
(9
): e0184852
PMID28922374
show ga
BACKGROUND: Ablative fractional photothermolysis (aFP) using a CO2 laser
generates multiple small diameter tissue lesions within the irradiation field.
aFP is commonly used for a wide variety of dermatological indications, including
treatment of photodamaged skin and dyschromia, drug delivery and modification of
scars due to acne, surgical procedures and burns. In this study we explore the
utility of aFP for treating oncological indications, including induction of local
tumor regression and inducing anti-tumor immunity, which is in marked contrast to
current indications of aFP. METHODOLOGY/PRINCIPAL FINDINGS: We used a fractional
CO2 laser to treat a tumor established by BALB/c colon carcinoma cell line
(CT26.CL25), which expressed a tumor antigen, beta-galactosidase (beta-gal). aFP
treated tumors grew significantly slower as compared to untreated controls.
Complete remission after a single aFP treatment was observed in 47% of the mice.
All survival mice from the tumor inoculation rejected re-inoculation of the
CT26.CL25 colon carcinoma cells and moreover 80% of the survival mice rejected
CT26 wild type colon carcinoma cells, which are parental cells of CT26.CL25
cells. Histologic section of the FP-treated tumors showed infiltrating neutrophil
in the tumor early after aFP treatment. Flow cytometric analysis of
tumor-infiltrating lymphocytes showed aFP treatment abrogated the increase in
regulatory T lymphocyte (Treg), which suppresses anti-tumor immunity and elicited
the expansion of epitope-specific CD8+ T lymphocytes, which were required to
mediate the tumor-suppressing effect of aFP. CONCLUSION: We have demonstrated
that aFP is able to induce a systemic anti-tumor adaptive immunity preventing
tumor recurrence in a murine colon carcinoma in a mouse model. This study
demonstrates a potential role of aFP treatments in oncology and further studies
should be performed.