Cancer Lett. 1999 Oct 1;144(2):131-6.

Dim light during darkness stimulates tumor progression by enhancing tumor fatty acid uptake and metabolism.

Dauchy RT, Blask DE, Sauer LA, Brainard GC, Krause JA.

Source

Bassett Research Institute, The Mary Imogene Bassett Hospital, Cooperstown, NY 13326, USA.

Abstract

Tumor linoleic acid uptake and metabolism, and growth are suppressed by melatonin, the synthesis of which is inhibited by light. Linoleic acid, via its mitogenic metabolite 13-hydroxyoctadecadienoic acid (13-HODE) is an important growth stimulant of rat hepatoma 7288CTC. Here we compared the effects of an alternating light:dark cycle (12L:12D), dim light (0.25 lux) present during the dark phase of a diurnal light cycle, and constant light on growth and fatty acid metabolism in hepatoma 7288CTC. Our results show that dim light suppressed melatonin release by the pineal gland, increased tumor linoleic acid uptake and 13-HODE production, and promoted tumor growth as effectively as did constant light.

PMID:: 10529012; [PubMed - indexed for MEDLINE]

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Melatonin inhibition of cancer growth in vivo involves suppression of tumor fatty acid metabolism via melatonin receptor-mediated signal transduction events. [Cancer Res. 1999]
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Dim light during darkness stimulates tumor progression by enhancing tumor fatty acid uptake and metabolism.

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