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BACKGROUNDTelomerase is a promising biomarker in cancer diagnosis and therapy. The elongation of telomeric repeats catalyzed by telomerase is accompanied by release of six PP(i) for each TTAGGG repeat (1 pmol PP(i)/310 pg telomeric repeats). We developed a novel method to measure telomerase activity by use of an enzymatic luminometric PP(i) assay (ELIPA).METHODSExtracts of cell lines and tissues were incubated with primer at 30 degrees C for 30 min. Released PP(i) was converted to ATP by sulfurylase, and ATP was detected by a luciferase bioluminescence system. The ELIPA results were compared with results obtained with the conventional telomeric repeat amplification (TRAP)-ELISA in 42 lung carcinoma tissues and 27 control tissues without malignancy.RESULTSThe lower detection limits of ELIPA and TRAP-ELISA were 5 and 10 cells, respectively. The within-run imprecision (CV) of ELIPA was < or =12%. When compared with TRAP-ELISA, the correlation coefficient (r) was 0.79. When we used the cutoff value from ROC analysis to distinguish malignant and nonmalignant tissues, the sensitivity and specificity of ELIPA were 83% and 96%, respectively, whereas the sensitivity and specificity of TRAP-ELISA were 71% and 96%, respectively.CONCLUSIONELIPA is a simple and sensitive homogeneous method to quantify telomerase activity.

Bioluminescent Method for Detecting Telomerase Activity