title: Efficacy of topical 0.05% retinaldehyde in skin aging by ultrasound and rheological techniques.
abstract: BACKGROUND
  The natural precursor of retinoic acid, i.e. retinaldehyde, has been proven to exert retinoid activities.
  
  
  OBJECTIVE
  The aim of this prospective instrument study was to determine the effect of topical retinaldehyde 0.05% on the physical properties of aging skin. This was performed using two devices, namely a high-resolution (70-80 microm) ultrasound scanner, which visualizes the thickness of both the epidermis and the dermis, and an echorheometer, which assesses the stiffness and elasticity of the skin by suction. In a 1-year study, 21 patients applied retinaldehyde cream 0.05% on the face, while another group of 19 volunteers were only treated with an emollient (control group). Epidermal and dermal thicknesses were measured on the forehead and temple, and stiffness and elasticity were measured on the forehead only. All the instrumental parameters were assessed at baseline and at the end of treatment.
  
  
  RESULTS
  Compared to the control group, retinaldehyde treatment induced a significant increase in epidermal thickness of the temple, as well as in cutaneous elasticity (p < 0. 01). Similarly, retinaldehyde treatment tended to increase dermal thickness and reduce cutaneous stiffness, but no statistical difference could be observed between the two groups.
  
  
  CONCLUSIONS
  Taken together, the results further suggest that retinaldehyde has counteracting effects on skin aging
authors.affiliation: Jean-Louis Alibert Center, Pierre Fabre Research Institute, Toulouse, France.
authors.forename: S
authors.initials: S
authors.lastname: Diridollou
authors.forename: M P
authors.initials: MP
authors.lastname: Vienne
authors.forename: M
authors.initials: M
authors.lastname: Alibert
authors.forename: C
authors.initials: C
authors.lastname: Aquilina
authors.forename: A
authors.initials: A
authors.lastname: Briant
authors.forename: S
authors.initials: S
authors.lastname: Dahan
authors.forename: P
authors.initials: P
authors.lastname: Denis
authors.forename: B
authors.initials: B
authors.lastname: Launais
authors.forename: V
authors.initials: V
authors.lastname: Turlier
authors.forename: P
authors.initials: P
authors.lastname: Dupuy
mesh_terms: D000287:Administration, Topical; D000328:Adult; D004548:Elasticity; D005145:Face; D005260:Female; D006801:Humans; D008875:Middle Aged; D011446:Prospective Studies; D012172:Retinaldehyde / Q000008:administration & dosage*; D012867:Skin / Q000000981:diagnostic imaging* / Q000187:drug effects; D015595:Skin Aging / Q000187:drug effects* / Q000502:physiology; D012879:Skin Physiological Phenomena; D014463:Ultrasonography
chemical_list: D012172:Retinaldehyde