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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
Microfluidic assessment of functional culture-derived platelets in human thrombi under flow.
Experimental Hematology 2015 October
Despite their clinical significance, human platelets are not amenable to genetic manipulation, thus forcing a reliance on mouse models. Culture-derived platelets (CDPs) from human peripheral blood CD34(+) cells can be genetically altered and may eventually be used for transfusions. By use of microfluidics, the time-dependent incorporation of CD41(+)CD42(+) CDPs into clots was measured using only 54,000 CDPs doped into 27 μL of human whole blood perfused over collagen at a wall shear rate of 100 sec(-1). With the use of fluorescence-labeled human platelets (instead of CDPs) doped between 0.25% and 2% of total platelets, incorporation was highly quantitative and allowed monitoring of the anti-αIIbβ3 antagonism that occurred after collagen adhesion. CDPs were only 15% as efficient as human platelets in their incorporation into human thrombi under flow, although both cell types were equally antagonized by αIIbβ3 inhibition. Transient transfection allowed the monitoring of GFP(+) human CDP incorporation into clots. This assay quantifies genetically altered CDP function under flow.
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