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Increased Phosphatidylcholine (16:0/16:0) in the Folliculus Lymphaticus of Warthin Tumor

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Specialty Chemistry
Date 2014 Jun 2
PMID 24880872
Citations 9
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Abstract

Warthin tumor (War-T), the second most common benign salivary gland tumor, consists mainly of neoplastic epithelium and lymphoid stroma. Some proteins and genes thought to be involved in War-T were evaluated by molecular biology and immunology. However, lipids as an important component of many tumor cells have not been well studied in War-T. To elucidate the molecular biology and pathogenesis of War-T, we investigated the visualized distribution of phosphatidylcholines (PCs) by imaging mass spectrometry (IMS). In our IMS analysis of a typical case, 10 signals were significantly different in intensity (p < 0.01) between the War-T and non-tumor (Non-T) regions. Five specific PCs were frequently found in the War-T regions of all of the samples: [PC (16:0/16:0) + K](+) (m/z 772.5), [PC (16:0/20:4) + K](+) (m/z 820.5), [PC (16:0/20:3) + K](+) (m/z 822.5), [PC (18:2/20:4) + K](+) (m/z 844.5), and [PC (18:0/20:5) + K](+) (m/z 846.5). PC (16:0/16:0) was increased specifically in the folliculus lymphaticus of War-T lymphoid stroma, suggesting a different metabolism. Localization of PC (16:0/16:0) might reflect inflammation activity participating in the pathogenesis of War-T. Thus, our IMS analysis revealed the profile of PCs specific to the War-T region. The molecules identified in our study provide important information for further studies of War-T pathogenesis.

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