The in vitro and in vivo genotoxicity of isotretinoin assessed by cytokinesis blocked micronucleus assay and comet assay

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Silva, FSG (Author) Other; Oliveira, H (Author) Other; Moreiras, A (Author) Other; Fernandes, JC (Author) Other; Bronze da Rocha, E (Author) FFUP; Figueiredo, A (Author) Other; Custodio, JBA (Author) Other; Rocha Pereira, P (Author) Other; Santos Silva, A (Author) FFUP

Journal

Title: Toxicology in Vitro

Vol. 27 No. 6

Pages: 900-907

ISSN: 0887-2333

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 2 Citations

Scientific classification

FOS: Medical and Health sciences > Basic medicine

Other information

Authenticus ID: P-005-2V3

DOI: 10.1016/j.tiv.2013.01.002

Abstract (EN): Isotretinoin is a retinoic acid frequently used in monotherapy or combined with narrow-band ultraviolet B (NBUVB) irradiation to treat patients with acne and psoriasis vulgaris. As both diseases need frequent and/or prolonged therapeutic interventions, the study of the genotoxicity of retinoids becomes important. Our aim was to study the genotoxic effects of isotretinoin alone or combined with NBUVB. In vitro studies were performed in the absence of S9 metabolic activation using blood from five healthy volunteers, incubated 72 h with isotretinoin (1.2-20 mu M) (i.e., at concentrations usually achieved in blood with therapeutic doses as well as at higher concentrations). In vivo studies were also performed using blood from two patients with acne and three patients with psoriasis vulgaris treated with isotretinoin in monotherapy (8 or 20 mg/day) or combined with NBUVB (20 mg isotretinoin/day + NBUVB). The genotoxic effect was evaluated by the cytokinesis-blocked micronucleus and the comet assays. Our studies showed that isotretinoin alone was not genotoxic when tested in human lymphocytes in vitro and in vivo. There was no clear genotoxic effect in psoriatic patients treated with isotretinoin and NBUVB. The in vitro studies showed that isotretinoin induced apoptosis and necrosis in human lymphocytes at higher doses.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8