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 Blood, 1 March 2005, Vol. 105, No. 5, pp. 2235-2238.
Prepublished online as a Blood First Edition Paper on August 3, 2004; DOI 10.1182/blood-2003-12-4399.

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TRANSPLANTATION
Brief report

Flowing cells through pulsed electric fields efficiently purges stem cell preparations of contaminating myeloma cells while preserving stem cell function

Abie Craiu, Yoriko Saito, Ana Limon, Henry M. Eppich, Douglas P. Olson, Neil Rodrigues, Gregor B. Adams, David Dombkowski, Paul Richardson, Robert Schlossman, Peter S. Choi, Jonathan Grogins, Paula G. O'Connor, Kenneth Cohen, Eyal C. Attar, Jay Freshman, Rebecca Rich, Joseph A. Mangano, John G. Gribben, Kenneth C. Anderson, and David T. Scadden

From Science Research Laboratory Inc, Somerville, MA; the Center for Regenerative Medicine and Technology, Massachusetts General Hospital; and the Jerome Lipper Myeloma Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA.

Autologous stem cell transplantation, in the setting of hematologic malignancies such as lymphoma, improves disease-free survival if the graft has undergone tumor purging. Here we show that flowing hematopoietic cells through pulsed electric fields (PEFs) effectively purges myeloma cells without sacrificing functional stem cells. Electric fields can induce irreversible cell membrane pores in direct relation to cell diameter, an effect we exploit in a flowing system appropriate for clinical scale. Multiple myeloma (MM) cell lines admixed with human bone marrow (BM) or peripheral blood (PB) cells were passed through PEFs at 1.35 kV/cm to 1.4 kV/cm, resulting in 3- to 4-log tumor cell depletion by flow cytometry and 4.5- to 6-log depletion by tumor regrowth cultures. Samples from patients with MM gave similar results by cytometry. Stem cell engraftment into nonobese diabetic–severe combined immunodeficient (NOD/SCID)/{beta}2m-/- mice was unperturbed by PEFs. Flowing cells through PEFs is a promising technology for rapid tumor cell purging of clinical progenitor cell preparations.


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