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Distinct intracellular calcium responses of individual cultured human keratinocytes to air pressure changes
Background We previously showed that application of hydraulic pressure to cultured human keratinocytes induced elevation of intracellular calcium concentration ([Ca2+]i), but the absolute value of the pressure could not be determined. Purpose To evaluate the effect of the absolute value of pressure...
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Published in: | Skin research and technology 2013-08, Vol.19 (3), p.346-351 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Request full text |
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Summary: | Background
We previously showed that application of hydraulic pressure to cultured human keratinocytes induced elevation of intracellular calcium concentration ([Ca2+]i), but the absolute value of the pressure could not be determined.
Purpose
To evaluate the effect of the absolute value of pressure on keratinocytes and other skin cells.
Methods
In the present work, we examined the effect of changes in absolute pressure level by observing the [Ca2+]i responses of cultured human keratinocytes and other cells cultured at the bottom of a hermetically sealed plastic flask as the air pressure in the flask was increased gradually, held stable, and then decreased abruptly, using the Ca2+‐indicator fura‐2.
Results
We found that the [Ca2+]i of differentiated keratinocytes was changed significantly in each phase, whereas undifferentiated keratinocytes and other cells derived from skin or dorsal root ganglion showed no response. Removal of calcium from the medium blocked the increase in [Ca2+]i in differentiated keratinocytes. The [Ca2+]i responses of individual differentiated keratinocytes in the increasing, stable and decreasing phases of pressure change varied from cell to cell. The threshold of air‐pressure increase from the original level for inducing [Ca2+]i response was 5 – 20 hPa.
Conclusion
These results suggest that epidermal keratinocytes might contain a sensory system that detects changes of external pressure on the skin. |
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ISSN: | 0909-752X 1600-0846 |
DOI: | 10.1111/srt.12045 |