Document Detail

Rheologically biomimetic cell suspensions for decreased cell settling in microfluidic devices.
MedLine Citation:
PMID:  21409456     Owner:  NLM     Status:  Publisher    
Many microfluidic devices operate with cells suspended in buffer solutions. Researchers who work with large cell types in such devices often run into problems with gravitational cell settling in the injection equipment and in the device itself. A method for reducing this problematic settling is discussed in this paper using tumor cell lines as an example. Microfluidic circulating tumor cell (CTC) isolation devices (MCIDs) are benchmarked using buffer solutions spiked with in-vitro tumor cell lines prior to validation with clinical samples (i.e. whole blood). However, buffer solutions have different rheological properties than whole blood. Here we describe the use of alginate in PBS buffer solutions to mimic blood rheology and reduce cell settling during preliminary validation experiments. Because alginate increases the viscosity of a solution, it helps to maintain cells in suspension. We report that vertical equipment configurations are important to further mitigate the effects of cell settling for MDA-MB-468 carcinoma cells. We also report that alginate does not disrupt the specific binding interactions that are the basis of carcinoma cell capture in MCIDs. These results indicate that vertical equipment configurations and the addition of alginates can be used to reduce cell settling in buffer based MCID testing and other applications involving large cells suspended in buffer solution.
Cari A Launiere; Gregory J Czaplewski; Ja Hye Myung; Seungpyo Hong; David T Eddington
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-16
Journal Detail:
Title:  Biomedical microdevices     Volume:  -     ISSN:  1572-8781     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100887374     Medline TA:  Biomed Microdevices     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Bioengineering, University of Illinois at Chicago, 851 S. Morgan Street, 218 SEO, Chicago, IL, 60607-7052, USA.
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