Effects of media buffer systems on growth and electrophysiologic characteristics of cultured sweat duct cells |
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Authors: | Cindy L Bell Paul M Quinton |
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Institution: | (1) Division of Biomedical Sciences, University of California, 92521 Riverside, California |
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Abstract: | Summary Primary cultures of human reabsorptive sweat duct cells were grown in MCDB 170 medium buffered with either HEPES, bicarbonate,
or a mixture of HEPES and bicarbonate buffers. Cultures grown in MCDB media containing bicarbonate seemed to differentiate
into a multilayered, keratinized epithelium and began senescing after 1 wk in culture. In contrast, cultures grown in media
containing HEPES as the only buffer seemed to undergo a selection process, resulting in the outgrowth of cells that did not
multilayer or keratinize extensively for up to 3 or 4 wk in culture. Despite marked differences in growth, cells grown in
both bicarbonate and HEPES-buffered media retained electrophysiologic characteristics appropriate to the progenitor. Mean
resting potentials were −21.8±0.8 mV (n=82), −23.3±1.3 mV (n=70) and −18.2±0.8 mV (n=82) for duct cells grown in HEPES, bicarbonate, and HEPES-bicarbonate media, respectively. Substitution of Cl− with the impermeant anion gluconate in the bathing medium caused membrane potential depolarization in all media, revealing
the presence of a Cl− conductance. Administration of the Na+ conductance inhibitor amiloride hyperpolarized the mean resting potential of cells grown in HEPES medium (−6.8±0.6 mV,n=68), bicarbonate medium (−6.9±0.5 mV,n=60), and HEPES-bicarbonate medium (−5.9±0.6 mV,n=69), demonstrating expression of a Na+ conductance. We observed some but minimal variation with age in any of these conditions.
This work was supported by grant DK41329-02 from the National Institute of Health, Bethesda, MD, and a Postdoctoral Fellowship
to Dr. Bell from the National Cystic Fibrosis Foundation. |
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Keywords: | sweat duct cultures buffers growth electrophysiologic characterization |
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