Abstract
In vitro-transcribed (IVT) mRNA encoding therapeutic protein has the potential to treat a variety of diseases by serving as template for translation in the patient. To optimize conditions for such therapy, reporter protein-encoding mRNAs are usually used. One preferred reporter is erythropoietin (EPO), which stimulates erythropoiesis and leads to an increase in hematocrit. Measurement of hematocrit is a fast and reliable method to determine the potency of the in vitro-transcribed EPO mRNA. However, frequent blood draw from mice can increase hematocrit due to blood loss. Therefore, instead of using conventional hematocrit capillary tubes, we adapted glass microcapillaries for hematocrit measurement. Daily monitoring of mice can be accomplished by drawing less than 20 μL of blood, thus avoiding blood loss-related hematocrit increase. Due to the small volume of the withdrawn blood the hematocrit remains the same for mice injected with control mRNA, whereas significant hematocrit increase is measured between day 4 and 20 postinjection for those injected with pseudouridine-modified EPO mRNA. Following hematocrit measurement the microcapillaries are snapped easily to recover plasma for further analyses, including EPO measurement by ELISA.
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References
Vogel J, Gassmann M (2011) Erythropoietic and non-erythropoietic functions of erythropoietin in mouse models. J Physiol 589:1259–1264
Sankaran VG, Weiss MJ (2015) Anemia: progress in molecular mechanisms and therapies. Nat Med 21:221–230
Richmond TD, Chohan M, Barber DL (2005) Turning cells red: signal transduction mediated by erythropoietin. Trends Cell Biol 15:146–155
Rivera VM, Gao GP, Grant RL, Schnell MA, Zoltick PW, Rozamus LW, Clackson T, Wilson JM (2005) Long-term pharmacologically regulated expression of erythropoietin in primates following AAV-mediated gene transfer. Blood 105:1424–1430
Pitard B, Bello-Roufai M, Lambert O, Richard P, Desigaux L, Fernandes S, Lanctin C, Pollard H, Zeghal M, Rescan PY, Escande D (2004) Negatively charged self-assembling DNA/poloxamine nanospheres for in vivo gene transfer. Nucleic Acids Res 32:e159
Sebestyén MG, Hegge JO, Noble MA, Lewis DL, Herweijer H, Wolff JA (2007) Progress toward a nonviral gene therapy protocol for the treatment of anemia. Hum Gene Ther 18:269–285
Kormann MS, Hasenpusch G, Aneja MK, Nica G, Flemmer AW, Herber-Jonat S, Huppmann M, Mays LE, Illenyi M, Schams A, Griese M, Bittmann I, Handgretinger R, Hartl D, Rosenecker J, Rudolph C (2011) Expression of therapeutic proteins after delivery of chemically modified mRNA in mice. Nat Biotechnol 29:154–157
Karikó K, Muramatsu H, Keller JM, Weissman D (2012) Increased erythropoiesis in mice injected with submicrogram quantities of pseudouridine-containing mRNA encoding erythropoietin. Mol Ther 20:948–953
Thess A, Grund S, Mui BL, Hope MJ, Baumhof P, Fotin-Mleczek M, Schlake T (2015) Sequence-engineered mRNA without chemical nucleoside modifications enables an effective protein therapy in large animals. Mol Ther 23:1456–1464
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Mahiny, A.J., Karikó, K. (2016). Measuring Hematocrit in Mice Injected with In Vitro-Transcribed Erythropoietin mRNA. In: Rhoads, R. (eds) Synthetic mRNA. Methods in Molecular Biology, vol 1428. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-3625-0_20
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DOI: https://doi.org/10.1007/978-1-4939-3625-0_20
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Publisher Name: Humana Press, New York, NY
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Online ISBN: 978-1-4939-3625-0
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