title: Synergistic effects of acitretin and narrow-band UVB on inducing the expression of heparin-binding epidermal-growth-factor-like growth factor in normal human keratinocytes.
abstract: It has been reported that heparin-binding epidermal-growth-factor-like growth factor (HB-EGF) plays an important role in regulating keratinocyte growth after retinoic acid treatment. In clinic, there are synergistic effects of retinoic acid plus ultraviolet (UVB) on improving efficacy and reducing the side effects in treating psoriasis, while the mechanism is not fully clear. Therefore, this study was taken to examine the alteration of cell proliferation and HB-EGF expression in cultured normal human keratinocytes after acitretin and/or narrow-band UVB (NB-UVB) exposure. After 12 h incubation with acitretin (0.1-1 micromol/L) and/or following NB-UVB (50-100 mJ/cm2) irradiation in normal human keratinocytes, the proliferation potency of the cells was evaluated by MTT colorimetric assay, and HB-EGF protein and mRNA was detected by cytoimmunochemistry and real-time quantitative reverse transcription polymerase chain reaction (RT-PCR), respectively. Our results revealed 1 micromol/L acitretin combined with 100 mJ/cm2 NB-UVB showed strongest inhibition of keratinocyte proliferation and highest induction of HB-EGF mRNA expression (19.7% and 8.6-fold, respectively), the others were 1 micromol/L acitretin (14.4%, 7.1-fold), 0.1 micromol/L acitretin (10.2%, 3.2-fold), 100 mJ/cm2 NB-UVB (8.7%, 2.5-fold) and 50 mJ/cm2 NB-UVB (5.4%, 1.8-fold). Pattern of HB-EGF protein expression was similar to mRNA expression in keratinocytes upon above cultural conditions. Our results suggest acitretin or NB-UVB single treatment can dose-dependently inhibit keratinocyte proliferation and induce HB-EGF expression and there are synergistic effects when they are combined.
authors.affiliation: Department of Dermatology, Second Hospital of Xi'an Jiaotong University, 157 Xi Wu Road, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Suju
authors.initials: S
authors.lastname: Luo
authors.forename: Zhenhui
authors.initials: Z
authors.lastname: Peng
authors.forename: Yan
authors.initials: Y
authors.lastname: Zheng
authors.forename: Lukun
authors.initials: L
authors.lastname: Zhang
authors.forename: Yiguo
authors.initials: Y
authors.lastname: Feng
authors.forename: Guorong
authors.initials: G
authors.lastname: Wang
mesh_terms: D017255:Acitretin / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects / Q000528:radiation effects; D002455:Cell Division / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured; D015870:Gene Expression / Q000187:drug effects / Q000528:radiation effects; D066257:Heparin-binding EGF-like Growth Factor; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics* / Q000378:metabolism; D015603:Keratinocytes / Q000166:cytology / Q000187:drug effects* / Q000528:radiation effects*; D007641:Keratolytic Agents / Q000494:pharmacology*; D012333:RNA, Messenger / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: C587883:HBEGF protein, human; D066257:Heparin-binding EGF-like Growth Factor; D036341:Intercellular Signaling Peptides and Proteins; D007641:Keratolytic Agents; D012333:RNA, Messenger; D017255:Acitretin