Influence of ultraviolet A radiation on osmolytes transport in human retinal pigment epithelial cells
AIM: To demonstrate that ultraviolet A(UVA)induces osmolytes accumulation in retinal pigment epithelial(RPE)cells.<p>METHODS: Under different experimental conditions such as UVA exposure, hyperosmotic stress condition and hypoosmotic stress condition, RPE cells were cultured for different time...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Press of International Journal of Ophthalmology (IJO PRESS)
2014-04-01
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| Series: | Guoji Yanke Zazhi |
| Subjects: | |
| Online Access: | http://www.ies.net.cn/cn_publish/2014/4/201404006.pdf |
| Summary: | AIM: To demonstrate that ultraviolet A(UVA)induces osmolytes accumulation in retinal pigment epithelial(RPE)cells.<p>METHODS: Under different experimental conditions such as UVA exposure, hyperosmotic stress condition and hypoosmotic stress condition, RPE cells were cultured for different time periods. The betaine /γ-amino- n-butyric acid(GABA)transporter, the sodium-dependent myoinositol transporter and the taurine transporter(TAUT)mRNA were measured by quantitative PCR. The radioactive labeled osmolytes were measured to evaluate the level of osmolytes transportation. <p>RESULTS: This study demonstrated that RPE expressed mRNA specific for the betaine/GABA transporter, for the sodium-dependent myoinositol transporter and for the TAUT. In comparison to norm osmotic(300mosmol/L)controls, a 3-5-fold induction of mRNA expression for the betaine/GABA transporter, the sodium-dependent myoinositol transporter and the TAUT was observed within 6-24h after hyperosmotic exposure(400mosmol/L). Expression of osmolyte transporters was associated with an increased uptake of radioactive labeled osmolytes. Conversely, hypoosmotic(200mosmol/L)stimulation induced significant efflux of these osmolytes. UVA significantly stimulated osmolyte uptake. Increased osmolyte uptake was associated with upregulation of mRNA steady-state levels for osmolyte transporters in irradiated cells.<p>CONCLUSION: UVA induces osmolyte uptake in RPE. It is similar reaction to hyperosmotic stress. This suggests that osmolyte uptake response by UVA may be important to maintain homeostasis. |
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| ISSN: | 1672-5123 1672-5123 |