RESUMO
Phototherapy is gaining more attention in the treatment of various diseases. Especially, blue light seems to be a promising approach for wound healing promotion due to its antimicrobial and immune-modulating properties. Despite this, there is only little research focusing on the immune-modulating properties of blue light and its possible effects on wound healing. Therefore, we investigated the effects of blue light irradiation on peripheral blood mononuclear cells (PBMC) and the influence on reepithelization in vitro. PBMCs were irradiated with DermoDyne® (DermoDyne HealthCare, Berlin, Germany) and effects on cell viability, cytokine expression, and scratch wound closure were evaluated afterwards. Irradiated cells showed a higher Interleukin-γ concentration while irradiation reduced resazurin concentration in a time-dependent manner. No differences in reepithelization were detectable when keratinocytes were treated with the supernatant of these blue light irradiated PBMCs. Blue light-mediated ex vivo stimulation of PBMCs does not cause faster reepithelization in an in vitro setting. Further research is needed to investigate the wound healing effects of phototherapy with blue light.
Assuntos
Leucócitos Mononucleares , Cicatrização , Queratinócitos , Luz , Fototerapia , Cicatrização/efeitos da radiaçãoRESUMO
INTRODUCTION: Phototherapy is gaining increased attention in the research and treatment of various diseases. In particular, the use of blue light seems to bear promise, owing to its antimicrobial and immune-modulating properties; however, research focused on the effects of blue light on keratinocytes and reepithelization is rare. In addition, few studies to date have evaluated devices that are used in daily hospital routine. OBJECTIVE: This study investigated the effects of phototherapy on keratinocytes with 2 established devices in vitro. MATERIALS AND METHODS: Human adult low calcium high temperature keratinocytes were irradiated with 2 different devices, and the effects on scratch wound closure, proliferation, cell viability, and cytokine expression were evaluated. RESULTS: Blue light irradiation reduced reepithelization at high doses in a scratch wound healing model (wound closure on day 1: control group, 25.57 percentage points [PP] ± 2.36 standard deviation vs Device A for 10 minutes, 1.33 PP ± 1.01) and mitochondrial activity measured with resazurin conversion (Device A for 10 minutes, 33.28% ± 12.34). Irradiated cells demonstrated a lower ratio of proliferating cell nuclear antigen-positive cells and, as a result, lower proliferation. CONCLUSIONS: Blue light reduces keratinocyte proliferation and migration at high doses and therefore could negatively affect wound healing. Available irradiation devices for possible use in wound therapy should be critically scrutinized and evaluated with in vitro methods prior to clinical use.
Assuntos
Fototerapia , Cicatrização , Proliferação de Células , Humanos , Queratinócitos , LuzRESUMO
OBJECTIVE: The aim is to analyse a modified standardised HILP procedure regarding the response rates, local recurrences and complication rates. PATIENTS AND METHODS: 152 patients (101 females, 51 males) with an average age of 62 years and locoregionally metastasised malignant melanoma underwent HILP using melphalan and dactinomycin between 1992 and 2007. Using M.D. Anderson's classification at the time of the perfusion 51 patients presented in stage IIIA, 43 patients in stage IIIAB and 58 patients in stage IV. If indicated, lymph node dissection was performed simultaneously just before perfusion of the extremity. RESULTS: Complete remission was observed in 91 (62.7%) of 145 patients, partial remission in 26 (17.9%) patients. 28 (19.3%) patients showed no response. The overall response rate was 80.7% (117 of 145 patients). Severe complications (Wieberdink IV/V) were seen in eight cases. The average recurrence-free survival was 17 months. The median survival was 39 months; the five-year overall survival rate was 38%. The overall survival rate was significantly influenced by the stage of the disease. CONCLUSION: HILP is an efficient therapy for multiple or recurrent in-transit metastases of malignant melanoma of the lower extremities. The efficiency increased by improving the technique of the perfusion. Long-term survival can be observed in patients without regional lymph node metastases or distant metastases.