Sphingolipids in Emotional Well-Being.

Emotional well-being is a multifactorial concept, which comprises not only life quality of human individuals, but also their mental and physical health. It encompasses several key parameters, many of which have behavioral representation in daily life. These include finding positive meaning of life events, ability to maintain supportive and caring social interactions, reward-oriented behavior, and many others. It is well-known that the behavioral phenotype is tightly bound to certain physiological and metabolic factors, among which sphingolipid (SL) balance of the organism and especially central nervous system might play an important role. Recent research proposes that SLs mediate multiple components of emotional well-being. The most abundant brain SL types, ceramides and gangliosides, dynamically shape the composition of protein carrying cellular membranes and overall neuronal plasticity. Multiple studies show the contribution of SLs to normal brain functioning and corresponding beneficial behavioral phenotypes, such as stress resilience, cognitive performance, and social interactions, which determine emotional well-being. On the other hand, an imbalance in SL metabolism affects normal functioning of cells and thus contributes to the development of several psychiatric disorders, such as depression, anxiety, cognitive decline, schizophrenia, and others. SLs are suggested as a potentially new mechanism of the key behavioral manifestations of emotional well-being, which might be further investigated as new biomarkers of life quality as well as physical and mental resilience.