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miércoles, 31 de julio de 2013

El ejercicio "menea" los genes

Estoy segura que todos han escuchado alguna vez la recomendación de que hacer ejercicio, aunque sea andar una media hora, ya que es beneficioso para la salud. Ahora contamos con datos que demuestran que el ejercicio modifica la metilación a nivel del ADN de las células musculares y del tejido adiposo. Vamos, que cuando movemos el esqueletos hasta los genes se alegran.
"Of the new studies, perhaps the most tantalizing, conducted principally by researchers affiliated with the Lund University Diabetes Centre in Sweden and published last month in PLoS One, began by recruiting several dozen sedentary but generally healthy adult Swedish men and sucking out some of their fat cells. Using recently developed molecular techniques, the researchers mapped the existing methylation patterns on the DNA within those cells. They also measured the men’s body composition, aerobic capacity, waist circumference, blood pressure, cholesterol levels and similar markers of health and fitness.
Then they asked the men to start working out. Under the guidance of a trainer, the volunteers began attending hourlong spinning or aerobics classes approximately twice a week for six months. By the end of that time, the men had shed fat and inches around their waists, increased their endurance and improved their blood pressure and cholesterol profiles.
Less obviously, but perhaps even more consequentially, they also had altered the methylation pattern of many of the genes in their fat cells. In fact, more than 17,900 individual locations on 7,663 separate genes in the fat cells now displayed changed methylation patterns. In most cases, the genes had become more methylated, but some had fewer methyl groups attached. Both situations affect how those genes express proteins.
The genes showing the greatest change in methylation also tended to be those that had been previously identified as playing some role in fat storage and the risk for developing diabetes or obesity.
“Our data suggest that exercise may affect the risk for Type 2 diabetes and obesity by changing DNA methylation of those genes,” says Charlotte Ling, an associate professor at Lund University and senior author of the study.
Meanwhile, other studies have found that exercise has an equally profound effect on DNA methylation within human muscle cells, even after a single workout".

martes, 30 de julio de 2013

Pintar con las manos

Las primeras pinturas humanas se hicieron con las manos. A menudo se trataba de expresiones mágicas para conjurar los malos espíritus o atraer animales durante las cacerías. Aquí les muestro la obra de una artista, Natalia Sas,  que en la actualidad practica la dactilopintura. Tiene su muro en Facebook.