RESUMO
BACKGROUND AND OBJECTIVES: Many studies have investigated the application of micro-insulated needles with radio frequency (RF) to treat acne in humans; however, the use of a micro-insulated needle RF applicator has not yet been studied in an animal model. The purpose of this study was to evaluate the effectiveness of a micro-insulated needle RF applicator in a rabbit ear acne (REA) model. STUDY DESIGN/MATERIALS AND METHODS: In this study, we investigated the effect of selectively destroying the sebaceous glands using a micro-insulated needle RF applicator on the formation of comedones induced by application of 50% oleic acid and intradermal injection of P. acnes in the orifices of the external auditory canals of rabbits. The effects of the micro-insulated needle RF applicator treatment were evaluated using regular digital photography in addition to 3D Primos imaging evaluation, Skin Visio Meter microscopic photography, and histologic analyses. RESULTS: Use of the micro-insulated needle RF applicator resulted in successful selective destruction of the sebaceous glands and attenuated TNF-alpha release in an REA model. The mechanisms by which micro-insulated needles with RF using 1 MHz exerts its effects may involve inhibition of comedone formation, triggering of the wound healing process, and destruction of the sebaceous glands and papules. CONCLUSION: The use of micro-insulated needles with RF applicators provides a safe and effective method for improving the appearance of symptoms in an REA model. The current in vivo study confirms that the micro-insulated needle RF applicator is selectively destroying the sebaceous glands. Lasers Surg. Med. 49:395-401, 2017. © 2016 Wiley Periodicals, Inc.
Assuntos
Acne Vulgar/terapia , Terapia a Laser/instrumentação , Agulhas , Glândulas Sebáceas/efeitos da radiação , Animais , Modelos Animais de Doenças , Orelha , Feminino , Proibitinas , CoelhosRESUMO
The present study aimed to investigate the antiinflammatory effect and mechanism of action of isosecotanapartholide (ISTP), isolated from Artemisia princeps Pampanini extract (APE). The effects of ISTP and APE on the proliferation of human keratinocytes following stimulation by tumor necrosis factorα/interferonγ were assessed. ISTP and APE downregulated the expression levels of signal transducer and activator of transcription1 (STAT1), and reduced interleukin33 (IL33) production. ISTP and APE inhibited the mRNA expression levels of thymus and activationregulated chemokine (TARC/CCL17) in a dosedependent manner. Western blot analysis demonstrated that ISTP and APE dosedependently inhibited protein expression levels of intercellular adhesion molecule1 and phosphorylation of STAT1. The results of the present study indicate that ISTP may inhibit TARC/CCL17 production in human epidermal keratinocytes via the STAT1 signaling pathway and may be associated with the inhibition of IL33 production. The current study indicated that ISTP is an active component in APE and may be a potential therapeutic agent for the treatment of inflammatory skin disorders.