1. Abstract
Hypertonic conditions induce osmoregulatory activity. Molecular mechanism, however, remains to be further elucidated concerning the osmosensitive balancing activity. Using a differential display protocol, the genes of taurine transporter (TauT) and cyclin C were identified as candidate responding to the hypertonicity. When a quantitative PCR analysis was performed on the total RNA from KBEF cell treated under hypertonic conditions, the gene expressions of TauT and cyclin C were greatly increased. In terms of protein, the level of TauT expression increased up to 3.2-fold in response to the hypertonic treatment. Similarly to TauT, cyclin C protein also increased 2.4-fold compared to the control treatments. Under taurine-rich extracellular conditions, however, the level of TauT expression increased as little as 1.8-fold by hypertonicity treatment. Cyclin C expression was also lowered compared with low-taurine hypertonic treatment. Cysteine dioxygenase was shown to be highly responsive to the hypertonic treatment. Taken together, these results strongly indicate that the gene expressions of TauT and cyclin C are cooperatively regulated under hypotonic conditions.
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Oh, C., Choi, Y.J., Kim, H.G., Lee, DH. (2006). Osmosensitive Gene Expression of Taurine Transporter and Cyclin C in Embryonic Fibroblast Cells. In: Oja, S.S., Saransaari, P. (eds) Taurine 6. Advances in Experimental Medicine and Biology, vol 583. Springer, Boston, MA . https://doi.org/10.1007/978-0-387-33504-9_5
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DOI: https://doi.org/10.1007/978-0-387-33504-9_5
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