Effect of intense pulsed light on transforming growth factor-beta1 mRNA expression in rat skin / 南方医科大学学报

ABSTRACT

<p><b>OBJECTIVE</b>To observe the effect of intense pulsed light (IPL) on transforming growth factor-beta1 mRNA (TGF-beta1 mRNA) expression in rat skin and explore the molecular mechanisms of photorejuvenation.</p><p><b>METHODS</b>Fifteen SD rats were exposed to IPL in 3 dermal regions with triple pulses (duration of 4, 5, and 6 ms) at the energy density of 34 J/cm2 and pulse delay of 20 or 25 ms. On days 1, 3, 5, 7, 15, and 30 after the treatment, skin specimens from the treated and non-treated areas were obtained to detect TGF-beta1 mRNA expression with in situ hybridization.</p><p><b>RESULTS</b>In the UPL-exposed skin areas, TGF-beta1 mRNA expression was detected in the epidermal keratinocytes and dermal cells 1 day after the exposure, reaching the highest expression level on day 7 followed by gradual decrement since day 15, and till day 30, only weak expression was found in the dermal cells. In the non-exposed regions, the cells remained negative for TGF-beta1 mRNA.</p><p><b>CONCLUSION</b>IPL can enhance TGF-beta1 mRNA expression in the skin, suggesting that TGF-beta1 plays an important role in dermal remodeling in photorejuvenation.</p>