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Abstract Title:

Ultraviolet A eye irradiation ameliorates colon carcinoma induced by azoxymethane and dextran sodium sulfate throughβ-endorphin and methionine-enkephalin.

Abstract Source:

Photodermatol Photoimmunol Photomed. 2017 Mar ;33(2):84-91. Epub 2017 Jan 19. PMID: 28039905

Abstract Author(s):

Keiichi Hiramoto, Satoshi Yokoyama, Yurika Yamate

Article Affiliation:

Keiichi Hiramoto

Abstract:

BACKGROUND: We previously reported that ultraviolet (UV) A eye irradiation reduces the ulcerative colitis induced by dextran sodium sulfate (DSS). This study examined the effects of UVA on colon carcinoma induced by azoxymethane (AOM) and DSS.

METHODS: We irradiated the eyes of ICR mice with UVA at a dose of 110 kJ/musing an FL20SBLB-A lamp for the experimental period.

RESULTS: In mice treated with these drugs, the symptom of colon carcinoma was reduced by UVA eye irradiation. The levels of interleukin (IL)-6 and tumor necrosis factor (TNF)-α in the blood were increased in AOM + DSS-treated mice; however, those levels were reduced by UVA eye irradiation. The expression of β-endorphin, methionine-enkephalin (OGF), μ-opioid receptor, and opioid growth factor receptor (OGFR) of the colon was increased in the AOM + DSS-treated mice, andthese levels were increased further following UVA eye irradiation. When β-endorphin inhibitor was administered, the ameliorative effect of UVA eye irradiation was reduced, and the effect of eye irradiation disappeared entirely following the administration of naltrexone (inhibitor of both opioid receptor and OGFR).

CONCLUSIONS: These results suggested that UVA eye irradiation exerts major effects on AOM + DSS-induced colon carcinoma.

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