Journal Article

Ceramide synthases and ceramide levels are increased in breast cancer tissue

Susanne Schiffmann, Jessica Sandner, Kerstin Birod, Ivonne Wobst, Carlo Angioni, Eugen Ruckhäberle, Manfred Kaufmann, Hanns Ackermann, Jörn Lötsch, Helmut Schmidt, Gerd Geisslinger and Sabine Grösch

in Carcinogenesis

Volume 30, issue 5, pages 745-752
Published in print May 2009 | ISSN: 0143-3334
Published online March 2009 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgp061
Ceramide synthases and ceramide levels are increased in breast cancer tissue

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Several in vitro studies have correlated dysfunction of the sphingolipid-signaling pathway with promotion of tumor cell growth as well as progression and resistance of tumors to chemotherapeutic agents. As ceramides (Cer) constitute the structural backbones of all sphingolipids, we investigated the endogenous ceramide levels in 43 malignant breast tumors and 21 benign breast biopsies and compared them with those of normal tissues using liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). The total ceramide levels in malignant tumor tissue samples were statistically significantly elevated when compared with normal tissue samples. Upregulation of the total ceramide level averaged 12-fold and 4-fold higher than normal tissue samples, for malignant tumors and benign tissues, respectively. Specifically, the levels of C16:0-Cer, C24:1-Cer and C24:0-Cer were significantly raised in malignant tumors as compared with benign and normal tissue. The augmentation of the various ceramides could be assigned to an increase of the messenger RNA levels of ceramide synthases (CerS) LASS2 (longevity assurance), LASS4 and LASS6. Notably, elevated levels of C16:0-Cer were associated with a positive lymph node status, indicating a metastatic potential for this ceramide. Moreover, the levels of C18:0-Cer and C20:0-Cer were significantly higher in estrogen receptor (ER) positive tumor tissues as compared with ER negative tumor tissues. In conclusion, progression in breast cancer is associated with increased ceramide levels due to an upregulation of specific LASS genes.

Journal Article.  5173 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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