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Tumor-promoting phorbol esters acutely activate a pathway in lymphocytes leading to the synthesis and accumulation of phosphatidylethanol, using exogenous ethanol as a precursor. This product is a representative of a unique class of acidic glycerophospholipids in which the head group is a primary alcohol. The formation of this lipid, in response to different phorbol ester derivatives, correlates with their activity as tumor promoters and inducers of growth changes in a variety of animal cells. Since phosphatidylethanol represents an unusual metabolite of ethanol, it is proposed that studies of its synthesis and biological functions may also provide new perspectives on the biology of alcohol addiction as well as the role of this biological pathway in tumor promotion.

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