Abstract
Being easy, safe and reliable, non-invasive prenatal diagnosis (NIPD) has been greatly pursued in recent years. Holding the complete genetic information of the fetus, fetal nucleated red blood cells (fNRBCs) are viewed as a suitable target for NIPD application. However, effective separating fNRBCs from maternal peripheral blood for clinic use still faces great challenges, given that fNRBCs are extremely rare in maternal blood circulation. Here, by combining the high-throughput inertial microfluidic chip with multifunctional microspheres as size amplification, we develop a novel method to isolate fNRBCs with high performance. To enlarge the size difference between fNRBCs and normal blood cells, we use the gelatin coated microspheres to capture fNRBCs with anti-CD147 as specific recognizer at first. The size difference between fNRBCs captured by the microspheres and normal blood cells makes it easy to purify the captured fNRBCs through the spiral microfluidic chip. Finally, the purified fNRBCs are mildly released from the microspheres by enzymatically degrading the gelatin coating. Cell capture efficiency about 81%, high purity of 83%, as well as cell release viability over 80% were achieved using spiked samples by this approach. Additionally, fNRBCs were successfully detected from peripheral blood of pregnant women with an average of 24 fNRBCs per mL, suggesting the great potential of this method for clinical non-invasive prenatal diagnosis.
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Acknowledgements
Authors Z. X. Wang and L. Cheng contributed equally to this work. This work is supported by the National R&D Program for Major Research Instruments (No. 81527801), the National Natural Science Foundation of China (No. 51272184, 81572860, and 61474084) and the National Science Fund for Talent Training in Basic Science (No. J1210061). National Key R&D Program (Grant No. 2016YFC1000701).
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Wang, Z., Cheng, L., Wei, X. et al. High-throughput isolation of fetal nucleated red blood cells by multifunctional microsphere-assisted inertial microfluidics. Biomed Microdevices 22, 75 (2020). https://doi.org/10.1007/s10544-020-00531-2
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DOI: https://doi.org/10.1007/s10544-020-00531-2