A Rapid and Efficient Platelet Purification Protocol for Platelet Gene Expression Studies

Isolation of pure platelet samples from whole blood is crucial for the study of platelet gene expression. The main obstacles to overcome in order to successfully isolate platelets from whole blood include (1) platelet activation; (2) leukocyte and red blood cell contamination, and (3) time-dependent platelet mRNA degradation. This chapter describes a rapid and highly efficient method for isolating human circulating platelets from small volumes of whole blood based on efficient inhibition of platelet activation and leukocyte removal by filtration followed by magnetic bead-depletion of residual contaminating leukocytes and red blood cells. Also described are methods for RNA extraction, cDNA synthesis, and platelet gene expression studies using both quantitative real-time PCR and microarray.

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