title: Immortalization and transformation are associated with specific alterations in choline metabolism.
abstract: Analysis of transformed, immortalized, and primary rat Schwann cells by high-resolution proton nuclear magnetic resonance spectroscopy reveals that immortalization of Schwann cells (by SV40 large T antigen) induced a decrease in sn-glycero-3-phosphocholine (GPCho), whereas H-ras alone, which is known to cause growth arrest in these cells, induced a marked increase in GPCho and a decrease in phosphocholine (PCho). An increase of PCho was found only in cells fully transformed by both oncogenes together. Moreover, we examined 11 human tumor cell lines, all of which expressed a PCho:GPCho ratio similar to that of fully transformed rat Schwann cells. Importantly, neither the absolute levels of PCho nor the ratio of PCho:GPCho were correlated with the rate of cell division across a range of normal (primary cultures) and transformed cells. Thus, raised PCho:GPCho ratios may serve as an indicator of multiple oncogenic lesions and malignancy in noninvasive tumor investigations.
authors.affiliation: The Royal College of Surgeons Unit of Biophysics, Institute of Child Health, London, United Kingdom.
authors.forename: K K
authors.initials: KK
authors.lastname: Bhakoo
authors.forename: S R
authors.initials: SR
authors.lastname: Williams
authors.forename: C L
authors.initials: CL
authors.lastname: Florian
authors.forename: H
authors.initials: H
authors.lastname: Land
authors.forename: M D
authors.initials: MD
authors.lastname: Noble
mesh_terms: D000818:Animals; D000957:Antigens, Viral, Tumor / Q000378:metabolism*; D002455:Cell Division; D002461:Cell Line, Transformed; D002794:Choline / Q000378:metabolism*; D005909:Glioblastoma / Q000378:metabolism; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008579:Meningioma / Q000378:metabolism; D009369:Neoplasms / Q000378:metabolism*; D009447:Neuroblastoma / Q000378:metabolism; D010767:Phosphorylcholine / Q000378:metabolism; D051381:Rats; D012583:Schwann Cells / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D018631:ras Proteins / Q000378:metabolism*
chemical_list: D000957:Antigens, Viral, Tumor; D010767:Phosphorylcholine; D018631:ras Proteins; D002794:Choline