| EGF | Epidermal growth factor |
| HaCaT | Human keratinocytes |
| DMSO | Dimethyl sulfoxide |
| Dyn | Dynorphin |
| MAPK | Mitogen-activated protein kinase |
| MEF | Mouse embryonic fibroblasts |
| MMC | Mitomycin C |
| MMP | Metalloproteinase |
| NEP | Neoendorphin |
| ProDyn | Prodynorphin |
| GPCR | G-protein coupled receptor |
| KO | Knock out |
| Veh | Vehicle |
| PKC | Protein kinase C |
| FBS | Fetal bovine serum |
| PBS | Phosphate buffered saline |
| RIPA | Radioimmunoprecipitation assay |
| SDS | Sodium dodecyl sulfate |
| ANOVA | Analysis of variance |