Membrane-associated phospholipase A1 beta (LIPI) Is an Ewing tumour-associated cancer/testis antigen.
BACKGROUND
Cancer/testis antigens (CTA) represent a heterogeneous group of antigens expressed nearly exclusively in tumour cells and testis. Recently, we identified phospholipase A1 beta (a CTA also known as lipase member I, LIPI) as a gene with high expression in Ewing family tumours (EFT). In the present paper we analyzed expression of LIPI in a panel of normal tissues and tumour samples.


METHODS
The expression of CTA in EFT and normal tissues was analyzed by using DNA microarray datasets. Expression of LIPI in EFT, a panel of other tumour samples, and normal tissues was analyzed by using RT-PCR and quantitative RT-PCR.


RESULTS
LIPI was expressed in EFT samples but not in other investigated tumour samples. Expression of LIPI in normal tissues was restricted to testis and thyroid. However, expression in these tissues was low compared with EFT. Interestingly testis as well as thyroid expressed all analyzed EFT-associated transcripts, suggesting that these tissues harbour a small cell population with molecular features of EFT. The sensitivity of the LIPI RT-PCR was similar to the sensitivity of the conventional EWSR1-FLI1 RT-PCR, suggesting that LIPI might be useful as additional diagnostic target structure.


CONCLUSIONS
The human cancer/testis antigen LIPI is highly expressed in Ewing family tumours and can be easily detected by RT-PCR or quantitative RT-PCR. LIPI might be an interesting target for the development of future diagnostic tools or treatment strategies.
Foell
Juergen L
JL
Department of Paediatrics, Children's Cancer Research Centre, Martin-Luther-University Halle-Wittenberg, 06097 Halle, Germany.
Hesse
Manuela
M
Volkmer
Ines
I
Schmiedel
Benjamin J
BJ
Neumann
Ingo
I
Staege
Martin S
MS
D000951:Antigens, Neoplasm / Q000032:analysis* / Q000502:physiology; D001859:Bone Neoplasms / Q000175:diagnosis / Q000276:immunology*; D006801:Humans; D008297:Male; D054466:Phospholipases A1 / Q000032:analysis* / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012512:Sarcoma, Ewing / Q000175:diagnosis / Q000276:immunology*; D013737:Testis / Q000276:immunology* / Q000378:metabolism; D013961:Thyroid Gland / Q000737:chemistry / Q000378:metabolism
D000951:Antigens, Neoplasm; C568778:LIPI protein, human; D054466:Phospholipases A1