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• W2396852204 abstract "Introduction: Activation of telomerase and telomere lengthening in patient peripheral blood leukocytes (PBL) is associated with longer survival in cancer patients. There are few studies to date that have measured telomerase activity in clinical PBL samples, and it is unclear how initial collection and processing of PBL samples impact the measurement of telomerase activity. In this study, we assessed if telomerase activity measurement varies based on the method of blood collection, processing and storage. Methods: We first collected whole blood drawn in EDTA tubes from two healthy patients that were then processed three different ways. The first whole blood sample was spun down and the buffy coat was pipetted from the top of the red blood cells, and then placed directly into the -80°C freezer. The next two whole blood samples were isolated using an ACCUSPIN™ tube, which utilizes density gradient separation to recover the PBL without contamination of red blood cells. The resulting PBL from these two samples were suspended in freezing media containing RPMI and DMSO, with one sample also containing penicillin streptomycin glutamine, and then both samples were stored in liquid nitrogen following a slow freeze. We then measured enzymatic telomerase activity in each of the three PBL samples from the two different patients. Results: We detected a comparable level of telomerase activity in all three PBL samples. These findings indicate that telomerase activity can be measured in buffy coat samples from patients independent of how the samples were processed and stored. Conclusions: These findings are important because many biorepositories may not have collected or processed PBL samples by identical processes, therefore not allowing direct comparison across samples. Additionally, our finding that telomerase activity levels are comparable between PBL samples containing red blood cells and those processed using an ACCUSPIN™ tube is valuable because it eliminates the necessity for the extra cost of the ACCUSPIN™ tube, freezing media, antibiotics and use of liquid nitrogen storage tanks. Future studies will focus on the determining the relationship of telomerase activity between the PBL, normal colon and cancer tissue in colorectal cancer patients. Citation Format: Ruth A. Johnson, Brooke R. Druliner, Jill Washechek Alleto, Donna Felmlee Devine, Xiaoyang Ruan, Russell Vanderboom, Lisa A. Boardman. How collection, processing and storage of PBL samples impact the measurement of telomerase activity. [abstract]. In: Proceedings of the AACR Special Conference on Computational and Systems Biology of Cancer; Feb 8-11 2015; San Francisco, CA. Philadelphia (PA): AACR; Cancer Res 2015;75(22 Suppl 2):Abstract nr B1-46." @default.
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• W2396852204 date "2015-11-15" @default.
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• W2396852204 title "Abstract B1-46: How collection, processing and storage of PBL samples impact the measurement of telomerase activity" @default.
• W2396852204 doi "https://doi.org/10.1158/1538-7445.compsysbio-b1-46" @default.
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