Do you ever wonder how some people just seem to run marathons with ease or can inherently memorize things such as times tables and trivia facts? As it turns out, these two skills are linked in ways scientists didn’t know were possible. In fact, a recent study by Salk scientists in Cell Metabolism argues that physical and mental activities rely on a single metabolic protein that controls the flow of blood and nutrients throughout the body, which could lead future researchers to potential treatments in regenerative and developmental medicine while simultaneously educating the general population about the defects in human learning and memory. Ronald Evans, the senior author of the study and director of the Salk Gene Expression lab, claims this protein enables the heart and muscles to gain a surge of energy to improve physical performance and endurance, as well as energizing the neurons responsible for information recall and long-term memory.
|Estrogen-related receptor gamma|
The protein, called estrogen-related receptor gamma (ERRγ), has been previously studied in 2011 in cardiology and its impact on skeletal muscles. In fact, promoting ERRγ activity in the skeletal muscle of mice “increased blood supply to their muscles and doubled their running capacity”, effectively turning on a whole host of muscle genes that can convert fat to energy. Could this protein be the master metabolic switch to long-lasting energy?
Despite these promising findings, many scientists had a hard time explaining their findings in the brain, as the brain burns sugar and ERRγ was previously shown to only burn fat. However, corresponding author Liming Pei, observed isolated neurons and found that ERRγ activates dozens of metabolic genes in brain cells and that neurons that lacked this protein could not produce as much ATP and did not perform as well. These researchers have now concluded that ERRγ turns on fat-burning pathways in muscles and sugar-burning pathways in the brain, with the most active ERRγ brain region being the hippocampus, an energetically demanding region directly involved in learning and memory.
They found that mice without ERRγ had normal vision, movement and balance, but had slower learning curves when swimming through a water maze and had troubles remembering the course in future trials compared to mice with the ERRγ protein being expressed.
The bottom line with this exciting research is that varying levels of ERRγ expression could potentially explain the differences in how each human learn and could be linked to changes in brain metabolism.
However, future research would provide a better understanding of the metabolism of neurons and pave the way to improved treatment and support for learning and attention deficit disorders. Since memory has an inherent metabolic scaffold, understanding the circuits behind the process of memory could lead researchers to an overall better understanding of learning. And, who knows? Perhaps high ERRγ levels could enhance learning in the end, just as it enhances muscle function.
Posted by: Rebecca Quirie (C)