The Role of Antiapoptotic Erythropoietin on Ultraviolet B-Induced Photodamaged Skin Through Inhibition of Sunburn Cells

Ultraviolet light causes photodamaged skin leading to photoaging skin. Ultraviolet-B (UV-B) causes epidermal keratinocyte apoptosis, namely sunburn cell, through apoptotic intrinsic pathway. Erythropoietin (EPO) has a role in cytoprotection in various tissues but its role to epidermal skin is not clear yet. This study was designed pretest-posttest control group design. Thirty two male mice Mus musculus, strain Balbc, were divided into control and treatment group, 16 mice each group. All mice were exposured by UV-B light 16mJ/cm2, distance 30 cm, duration 90 seconds, for 3 consecutive days. Four mice each group were randomly sacrificed as pretest data. The control mice were given aquadest subcutaneous injection 0.1 mL, and treatment mice were given EPO subcutaneous injection 0.1 mL (100 IU/kg BW). UVB were given everyday with same protocol above. Treatments were given 4 times, interval 3 days. All mice were sacrificed to examine sunburn cells. Data were performed as mean ± SD and analyzed by t-test using SPSS 17.0 with significant value p<0.05. Sunburn cells of pretest control were 25.00 ± 4.85% and treatment group were 24.83 ± 5.15%. Sunburn cells significantly decreased (p=0.002) in treatment group (31.5 ± 9.39%) than control (50.83 ± 6.70%). UV-B causes sunburn cells formation. EPO inhibits apoptosis through increasing NO production and eNOS expression, inhibiting caspase and proinflammatory cytokines, and increasing antiapoptotic protein. EPO has a role in skin apoptosis inhibition which is shown by decreased sunburn cells

Java plum (Syzygium cumini) extract cream effect on decreasing the number of sunburn cell on the dorsal skin of male Wistar rat (Rattus norvegicus) exposed to UV-radiation

Background: The primary acute damage due to UV radiation is keratinocyte apoptosis or sunburn cell. Previous studies showed that antioxidants inhibit UV damage. Java plum (Syzygium cumini) which is found in Indonesia, was known to have a high concentration of antioxidants. This study was aimed to assess the Java plum ethanol extract cream effects on the number of sunburn cells on the dorsal skin of male Wistar rats that exposed to UV-B. Methods This experimental research was a post-test only control group design that was conducted on 30 male rats. Groups were divided into control, placebo, 5%, 10%, and 20% ethanol extract cream concentrations (P1, P2, P3, P4, and P5, respectively). The number of sunburn cell were then observed and recorded based on visual evaluation of the skin biopsy under a light microscope. Results: The mean results of P1, P2, P3, P4, and P5 were 132.67, 98.67, 118.67, 104.00, and 54.67 respectively. The control, placebo, 5%, and 10% ethanol extract cream showed no significant result (p>0.05). In contrast, 20% ethanol extract cream showed a protective effect (p<0.05). Conclusion: Java plum ethanol extract cream with 20% dose could decrease the number of sunburn cells in the skin.

UVA-UVB Photoprotective Activity of Topical Formulations ContainingMorinda citrifoliaExtract

Exposure to solar radiation, particularly its ultraviolet (UV) component, has a variety of harmful effects on human health. Some of these effects include sunburn cell formations, basal and squamous cell cancers, melanoma, cataracts, photoaging of the skin, and immune suppression. The beneficial photoprotective effects of topical formulations with the extract,Morinda citrifolia, have not been investigated. This present study aims to investigate the potential benefits ofM. citrifoliatopical application on the dorsal skin of mice, exposed to UVA-UVB light. Using 7 days of treatment, [before (baseline values) and 20 h after UV exposure], the thickness, skin barrier damage (TEWL), erythema, and histological alterations were evaluated. The results showed that the formulations containing the extract protected the skin against UV-induced damage.