Microfluidic leukocyte isolation for gene expression analysis in critically ill hospitalized patients

Aman Russom, Palaniappan Sethu, Daniel Irimia, Michael N. Mindrinos, Steve E. Calvano, Iris Garcia, Celeste Finnerty, Cynthia Tannahill, Amer Abouhamze, Julie Wilhelmy, M. Cecilia López, Henry V. Baker, David N. Herndon, Stephen F. Lowry, Ronald V. Maier, Ronald W. Davis, Lyle L. Moldawer, Ronald G. Tompkins, Mehmet Toner, Paul E. BankeyTimothy R. Billiar, Bernard H. Brownstein, David G. Camp, George Casella, Irshad H. Chaudry, Mashkoor Choudhry, J. Perren Cobb, Asit De, Constance Elson, Bradley Freeman, Richard L. Gamelli, Nicole S. Gibran, Douglas L. Hayden, Brian G. Harbrecht, Jureta W. Horton, William Hubbard, Jeffrey Johnson, Matthew B. Klein, James A. Lederer, Tanya Logvinenko, John A. Mannick, Philip H. Mason, Grace P. McDonald-Smith, Bruce A. McKinley, Carol Miller-Graziano, Joseph P. Minei, Ernest E. Moore, Frederick A. Moore, Avery B. Nathens, Grant E. O'Keefe, Laurence G. Rahme, Daniel G. Remick, David A. Schoenfeld, Michael B. Shapiro, Martin Schwacha, Geoffrey M. Silver, Richard D. Smith, John Storey, H. Shaw Warren, Michael A. West, Wenzhong Xiao

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


BACKGROUND: Microarray technology is becoming a powerful tool for diagnostic, therapeutic, and prognostic applications. There is at present no consensus regarding the optimal technique to isolate nucleic acids from blood leukocyte populations for subsequent expression analyses. Current collection and processing techniques pose significant challenges in the clinical setting. Here, we report the clinical validation of a novel microfluidic leukocyte nucleic acid isolation technique for gene expression analysis from critically ill, hospitalized patients that can be readily used on small volumes of blood. METHODS: We processed whole blood from hospitalized patients after burn injury and severe blunt trauma according to the microfluidic and standard macroscale leukocyte isolation protocol. Side-by-side comparison of RNA quantity, quality, and genome-wide expression patterns was used to clinically validate the microfluidic technique. RESULTS: When the microfluidic protocol was used for processing, sufficient amounts of total RNA were obtained for genome-wide expression analysis from 0.5 mL whole blood. We found that the leukocyte expression patterns from samples processed using the 2 protocols were concordant, and there was less variability introduced as a result of harvesting method than there existed between individuals. CONCLUSIONS: The novel microfluidic approach achieves leukocyte isolation in <25 min, and the quality of nucleic acids and genome expression analysis is equivalent to or surpasses that obtained from macroscale approaches. Microfluidics can significantly improve the isolation of blood leukocytes for genomic analyses in the clinical setting.

Original languageEnglish (US)
Pages (from-to)891-900
Number of pages10
JournalClinical chemistry
Issue number5
StatePublished - May 1 2008

ASJC Scopus subject areas

  • General Medicine


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