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Objective:To establish a safe, effective, simple, and more economically feasible method to obtain platelet-rich plasma (PRP).Methods:Whole blood was collected from 24 patients with atrophic acne scars on the face. For the preparation of PRP, a slight modification of Choukroun＇s method was used. Enzyme-linked immunosorbent assay (ELISA) was used to measure the levels of platelet derived growth factor-β(PDGF-β), transforming growth factor-β1 (TGF-β1), epidermal growth factor (EGF), vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), isulin-like growth factor-1 (IGF-1) in normal plasma and PRP.Results:The average concentration of PDGF-β in PRP was (755.61±418.31) ng/L, which was higher than [(479.93±279.18) ng/L] in normal plasma ( t=3.479, P<0.01). The average concentration of TGF-β1 in PRP was (2267.00±1223.68), which was higher than [(1535.50±910.91) ng/L] in normal plasma ( t=7.082, P<0.01). The average concentration of EGF in PRP was (30.70±12.39) ng/L, which was higher than [(20.77±10.31) ng/L] in normal plasma ( t=6.899, P<0.01). The average concentration of VEGF in PRP was (25.42±17.69) ng/L, which was higher than [(12.01±7.77) ng/L] in normal plasma ( t=5.230, P<0.01). The average concentration of bFGF was (17.85±7.17) ng/L, which was higher than [(10.90±4.73) ng/L] in normal plasma ( t=6.050, P<0.01). The average concentration of IGF-1 was (201.22±36.80) ng/ml, which was higher than [(174.90±33.80) ng/ml] in normal plasma ( t=3.760, P<0.01). Conclusions:Compared to normal plasma, modified PRP contains higher levels of growth factors. The modified method is a reliable option for liquid PRP, especially applicable for invasive cosmetic laser surgery to promote wound repair.
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Objective To investigate sun protection behavior among middle-aged and elderly women in Beijing.Methods The central (Xuanwumen district) and peripheral areas (Yanqing district) of Beijing city were selected for investigation from May to June in 2016.By random sampling and field investigation,interviewees completed questionnaires with the help of dermatologists.Results A total of 400 females aged 40-90 years were investigated,including 190 in the Xuanwumen district and 210 in the Yanqing district.Among all the subjects,the average duration of outdoor activities was 2 hours.Moreover,117 (29.2％) of the 400 interviewees had the active sun exposure habit,including 38 (18.1％) in the Yanqing district and 79 (41.6％) in the Xuanwumen district,and the proportion of subjects with the active sun exposure habit significantly differed between the two districts (x2 =26.582,P ＜ 0.001).In addition,67 (16.8％) interviewees had a sunburn history,and 130 (32.5％) were used to applying sunscreen.The proportion of sunscreen users was significantly higher in moderately or highly educated women (103 [45.2％]) than in lowly educated women (28/172 [16.3％],P ＜ 0.001).The proportion of sunscreen users in women with skin type Ⅲ (41.2％ [70/170]) was significantly higher than that in those with skin type Ⅳ (26.5％ [61/230],P =0.002).The scores for facial skin aging and dorsal hand skin aging were both significantly lower in sunscreen users than in non-users (Z =18.536,10.731,P =0.002,0.026,respectively).Conclusion The active sun exposure habit in the middle-aged and elderly women differs between the central and peripheral areas of Beijing,and the use of sunscreen is associated with education level.
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It was found that psoralen derivative could perform a Friedel-Crafts acylation smoothly with acetic anhydride to give 5'-acetylpsoralen in a 73% yield. In the presence of boron trifluoride etherate, 5'-acetylpsoralen reacted with both aromatic amines and aliphatic amine smoothly to afford 5'-Schiff-base group substituted psoralen derivatives in 72%-92% yields. The novel synthetic method has the advantages of cheap materials, mild reaction conditions, good yields and high regioselectivity in the Friedel-Crafts acylation. Cell viability assay by MTT demonstrates that some of the psoralen derivatives 6 have antiproliferative activities.