Article: Zhu GL, Smith J, Yarmush ML, Nahmias Y, Kirby BJ, Murthy SK, (2013) Microfluidic Enrichment of Mouse Epidermal Stem Cells and Validaton of Stem Cell Proliferation In Vitro. Tissue Engineering Part C-Methods, 19 (10): 765-773
Abstract: Bulge stem cells reside in the lowest permanent portion of hair follicles and are responsible for the renewal of these follicles along with the repair of the epidermis during wound healing. These cells are identified by surface expression of CD34 and the alpha 6-integrin. When CD34 and alpha 6 double-positive cells are isolated and implanted into murine skin, they give rise to epidermis and hair follicle structures.
The current gold standard for isolation of these stem cells is fluorescence-activated cell sorting (FACS) based on cell surface markers. Here, we describe an alternative method for CD34 bulge stem cell isolation: a microfluidic platform that captures stem cells based on cell surface markers. This method is relatively fast, requiring 30 min of time from direct introduction of murine skin tissue digestate into a two-stage microfluidic device to one-pass elution of CD34(+) enriched cells with a purity of 55.8%+/- 5.1%. The recovered cells remain viable and formed colonies with characteristic morphologies. When grown in culture, enriched cells contain a larger alpha 6(+) population than un-enriched cells.