Caracterización clínica de pacientes con vitiligo en un hospital universitario en Colombia / Clinical characterization of patients with vitiligo in a university hospital in Colombia

Introduccion y objetivo: El vitíligo es una hipomelanosis adquirida que se manifiesta clí-nicamente por la aparición progresiva de máculas acrómicas en la piel y cabello de áreas afectadas. La prevalencia mundial es de 0,5% a 2%. El objetivo, es dar a conocer la caracte-rización dermatológica clínica y terapéutica de los pacientes del Hospital Universitario de Santander. Métodos: Estudio observacional, descriptivo de corte transversal retrospectivo. La población estudio fueron pacientes con Vitíligo que ingresaron a un hospital universitario de Colombia entre el período comprendido entre los años 2012-2016 en pacientes mayores de 13 años que ingresen a la institución.

Plasma Hypoxanthine-Guanine Phosphoribosyl Transferase Activity in Bottlenose Dolphins Contributes to Avoiding Accumulation of Non-recyclable Purines.

Marine mammals are exposed to ischemia/reperfusion and hypoxia/reoxygenation during diving. During oxygen deprivation, adenosine triphosphate (ATP) breakdown implies purine metabolite accumulation, which in humans is associated with pathological conditions. Purine recycling in seals increases in response to prolonged fasting and ischemia. Concentrations of metabolites and activities of key enzymes in purine metabolism were examined in plasma and red blood cells from bottlenose dolphins (Tursiops truncatus) and humans. Hypoxanthine and inosine monophosphate concentrations were higher in plasma from dolphins than humans. Plasma hypoxanthine-guanine phosphoribosyl transferase (HGPRT) activity in dolphins suggests an elevated purine recycling rate, and a mechanism for avoiding accumulation of non-recyclable purines (xanthine and uric acid). Red blood cell concentrations of hypoxanthine, adenosine diphosphate, ATP and guanosine triphosphate were lower in dolphins than in humans; adenosine monophosphate and nicotinamide adenine dinucleotide concentrations were higher in dolphins. HGPRT activity in red blood cells was higher in humans than in dolphins. The lower concentrations of purine catabolism and recycling by-products in plasma from dolphins could be beneficial in providing substrates for recovery of ATP depleted during diving or vigorous swimming. These results suggest that purine salvage in dolphins could be a mechanism for delivering nucleotide precursors to tissues with high ATP and guanosine triphosphate requirements.