자외선 B 조사 마우스에서 피부손상에 대한 분죽(Phyllostachys nigra var. henenis Strapf)잎 추출물의 효과 = The Effect of Bamboo (Phyllostachys nigra var. henenis Strapf) Leaf Extract on Ultraviolet B-induced Skin Damages in Mouse

다국어 초록 (Multilingual Abstract)

The effects of bamboo (Phyllostachys nigra var. henenis Strapf) leaf extract (BLE) on the changes of ultraviolet (UV) light B radiation-induced apoptotic sunburn cell (SBC) and epidermal ATPase-positive dendritic cell (DC) in SKH1-hr or ICR mouse were investigated. The mice were treated with UVB (200 mJ/cm2) and were sacrificed 24 hours later. BLE (50 mg/kg of body weight) or vehicle (saline) was given i.p. at 36 and 12 hours before irradiation, and 30 minutes after irradiation. BLE cream (0.2%) or cream base (vehicle) was also topically treated at 24 hours and 15 minutes before irradiation, and immediately after irradiation. The skin of SKH1-hr mouse prepared from the back of untreated mice exhibited about 0.3 SBC/cm length of epidermis, and 24 hours after UV irradiation, the applied areas show an increased number of SBCs. But the frequency of UVB-induced SBC formation was significantly reduced by intraperitoneal injection (59.0%) and topical application (31.8%) of BLE extract. The numbers of DC in normal ICR mouse were 628.00 ± 51.56 or 663.20 ± 62.58 per mm2 of ear epidermis. By 1 day after UVB treatment, the number of ATPase-positive cells/mm2 were decreased by 39.0% or 27.1% in i.p. or topical application group with vehicle. The frequency of UVB (200 mJ/cm2)-induced DC decrease was reduced by treatment of BLE as 25.7% in i.p. group and 3.2% in topical application group compared with the irradiation control group. The results presented herein that BLE administration could reduce the extent of skin damages produced by UVB.

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