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Anais Brasileiros de Dermatologia
On-line version ISSN 1806-4841
PATRIOTA, Régia Celli Ribeiro; RODRIGUES, Consuelo Junqueira and CUCE, Luiz Carlos. Intense pulsed light in photoaging: a clinical, histopathological and immunohistochemical evaluation. An. Bras. Dermatol. [online]. 2011, vol.86, n.6, pp.1129-1133. ISSN 1806-4841. http://dx.doi.org/10.1590/S0365-05962011000600010.
BACKGROUND: Intense pulsed light has been used in the treatment of photoaging without a full understanding of its mechanism of action. OBJECTIVE: To study the effect of intense pulsed light on photoaging and on the skin immune response by means of a clinical and histopathological study, evaluating Langerhans cells (CD1), expression of intercellular adhesion molecule, of CD4 and CD8 lymphocytes and quantification of collagen and elastic fibers. METHODS: In 2006 a total of 26 patients, aged 40 to 65 years, with phototypes II to III (Fitzpatrick scale), were treated for photoaging using intense pulsed light in five sessions with a monthly interval. All the patients were subjected to histological and immunohistochemical evaluation 6 months after treatment. RESULTS: At the end of the treatment clinical improvement was observed in 76.92% of cases. This improvement was associated to a significant increase of collagen (51.33%) and elastic (44.13%) fibers. Intense pulsed light treatment led to a reduction of CD4 lymphocytes and did not alter the amount of CD8 lymphocytes. It also led to a significant increase of small, nonectatic blood vessels, positive intercellular adhesion molecule. CONCLUSION: Facial treatment with intense pulsed light promoted major clinical improvement that was confirmed by histological examination of the skin. This technique is a good treatment option for skin photoaging because it is non-ablative, safe and effective
Keywords : Collagen; Elastic tissue; Lasers; Skin aging; Rejuvenation.