Search

With increased popularity of decorative tattoos, awareness of tattoo-based dermatological complications has been raised. Health issues include a broad spectrum dominated by allergies and infections. To examine the etiopathology and prognose the outcome of an appropriate therapy, a non-invasive intravital diagnostic approach is indicated. The present pilot study introduces multiphoton tomography equipped with fluorescence lifetime imaging as a diagnostic technique to examine the morphological and metabolic status of tattooed human skin at patient's bedside. The distributing course of tattoo particles can be visualised over time. By providing optical biopsies, inflammation-based alterations in freshly tattooed skin and tattoo complications can be analysed. The study concludes that multiphoton tomography combined with fluorescence lifetime imaging is a suitable technique for in vivo visualisation of tattoo pigments as well as for the assessment of quantitative and qualitative skin changes after injection of tattoo ink into human skin.

Zusammenfassung Hintergrund Der Pikosekundenlaser gehört zu den jüngsten in der Dermatologie genutzten Lasersystemen. Ursprünglich wurde er zur Optimierung von Tätowierungsentfernungen entwickelt, Fortschritte in dieser Technologie erweiterten das Indikationsspektrum des Pikosekundenlasers jedoch erheblich. Ziel der Arbeit Dieser Artikel gibt eine Übersicht über den technischen Hintergrund sowie die Indikationen des Pikosekundenlasers in der dermatologischen Lasermedizin und erläutert die Möglichkeiten und Grenzen dieses Lasersystems. Material und Methoden Grundlage dieses Beitrages sind systematische Literaturanalyse sowie Erfahrungen aus der klinischen Praxis in der universitären Laserambulanz. Ergebnisse Der Pikosekundenlaser ermöglicht durch Impulse im Pikosekundenbereich und den Wirkmechanismus des „laser-induced optical breakdown“ eine besonders schonende und effektive Behandlung. Im Vergleich zu den gütegeschalteten Lasern weist der Pikosekundenlaser weniger hitzeinduzierte Nebenwirkungen auf und geht mit einer geringeren Schmerzintensität sowie einer kürzeren Ausfallzeit einher. Insbesondere durch die fraktionierte nichtablative Anwendung haben sich zusätzliche Anwendungsgebiete ergeben, darunter die Hautverjüngung und Narbentherapie. Schlussfolgerung Der Pikosekundenlaser findet ein breites Anwendungsspektrum in der dermatologischen Lasermedizin. Die aktuelle Datenlage deutet darauf hin, dass der Laser eine effektive Methode mit einem geringen Nebenwirkungsprofil ist. Um die Wirksamkeit, Verträglichkeit und Patientenzufriedenheit evidenzbasiert beurteilen zu können, sind weitere prospektive Studien notwendig.

In recent years, severe ocular complications after dermatological laser therapies have been reported. One hypothesis is thermal damage due to heating of the metal eye shields. The aim of the present study is to evaluate the safety of ocular metal eye shields during laser therapy of the periocular region. For the experimental study, porcine eyelids were exposed to continuously increasing laser energy and multiple pulses using a number of dermatologic laser systems. Temperature differences of the convex and concave surface of metal eye shields were constantly measured using a thermocouple. Maximum increase of the convex surface of shields was + 8.9 °C (± 0.1 °C) provided by the long-pulsed alexandrite laser (20–25-J/cm2 energy, 15-mm spot size, 20-ms pulse duration, 1 Hz). Present data indicate that metal eye shields provide sufficient thermal protection when clinically used laser parameters are applied. Other safety precautions continue to be essential to protect both the patient and the laser operator. These include the use of nonreflective metal eye shields, precise knowledge of laser physics, and a clear understanding of how they interact with ocular and periocular anatomy.

Extradigital localizations of glomus tumors (GTs) remain rare and can often lead to missed or delayed diagnosis due to nonspecific symptoms. In this article, we report a case of a GT with a rare lo...

CREB (cyclic AMP response element binding protein) binding protein (CBP, CREBBP) is a ubiquitously expressed transcription coactivator with intrinsic histone acetyltransferase (KAT) activity. Germline mutations within theCBPgene are known to cause Rubinstein-Taybi syndrome (RSTS), a developmental disorder characterized by intellectual disability, specific facial features and physical anomalies. Here, we investigate mechanisms of CBP function during brain development in order to elucidate morphological and functional mechanisms underlying the development of RSTS. Due to the embryonic lethality of conventional CBP knockout mice, we employed a tissue specific knockout mouse model (hGFAP-cre::CBPFl/Fl, mutant mouse) to achieve a homozygous deletion of CBP in neural precursor cells of the central nervous system.Our findings suggest that CBP plays a central role in brain size regulation, correct neural cell differentiation and neural precursor cell migration. We provide evidence that CBP is both important for stem cell viability within the ventricular germinal zone during embryonic development and for unhindered establishment of adult neurogenesis. Prominent histological findings in adult animals include a significantly smaller hippocampus with fewer neural stem cells. In the subventricular zone, we observe large cell aggregations at the beginning of the rostral migratory stream due to a migration deficit caused by impaired attraction from the CBP-deficient olfactory bulb. The cerebral cortex of mutant mice is characterized by a shorter dendrite length, a diminished spine number, and a relatively decreased number of mature spines as well as a reduced number of synapses.In conclusion, we provide evidence that CBP is important for neurogenesis, shaping neuronal morphology, neural connectivity and that it is involved in neuronal cell migration. These findings may help to understand the molecular basis of intellectual disability in RSTS patients and may be employed to establish treatment options to improve patients’ quality of life.

Additional file 1: Figure S1. Mutation distribution analysis in published RSTS cases and additional MRI results. Figure S2. Immunohistological analysis of the hippocampus, neocortex and olfactory bulb, myelination analysis and olfactory behavior testing. Figure S3. Immunohistological analysis of prenatal stages E14.5 and E16. Figure S4. Cell volume and dendrite branch analysis. Figure S5. Supplementary data on neurogenesis and migration in the olfactory bulb, the V-SVZ and the corpus callosum at P15 and P30.