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Authors Leydon C, Bartlett RS, Roenneburg DA, Thibeault SL
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Journal J. Speech Lang. Hear. Res. Volume: 54 Issue: 4 Pages: 1060-6
Publish Date 2011 Aug
PubMed ID 21330647
PMC ID 3167580

Epithelial homeostasis is critical for vocal fold health, yet little is known about the cells that support epithelial self-renewal. As a known characteristic of stem cells is that they are slow-cycling in vivo, the purpose of this prospective controlled study was to identify and quantify slow-cycling cells or putative stem cells in murine vocal fold epithelium.Twelve mice were administered daily intraperitoneal injections of a nucleotide dye, bromodeoxyuridine (BrdU), over 7 consecutive days. Under this pulse-chase paradigm, slow-cycling cells retain the dye (label-retaining cells; LRCs) while more rapidly cycling cells lose dye to dilution during multiple cell divisions. The percentage of label-retaining cells (%LRCs) was calculated following a chase period of 2, 4, and 8 weeks postinjections.The LRCs decreased significantly from 9.4 at 2 weeks to 3.1% at 8 weeks following injections (p < .05). No statistically significant differences in the quantity of BrdU-positive cells were measured between the anterior, mid-membranous, or cartilaginous regions of the vocal fold (p > .05).These findings are consistent with the presence and first report of a small population of putative stem cells along the length of murine vocal fold epithelium.

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