Brain energy metabolism: A roadmap for future research

The brain's energy metabolism is a complex system that supports its high metabolic demands. While prior research has identified key substrates and transporters involved in brain energy supply, many interrelationships remain unclear. Existing knowledge includes the role of glucose and lactate in neuronal and glial metabolism. However, gaps persist in understanding how these substrates interact with other metabolic pathways. The biochemical and cellular mechanisms underlying brain energy use are not fully mapped. Insulin signaling and lipid droplet function in the brain remain poorly understood. NAD+ and its role in brain signaling are still mysterious. The article highlights how these unknowns affect our understanding of brain function in health and disease. This gap motivates the need for a comprehensive roadmap to guide future research.

This study aims to identify critical unknowns in brain energy metabolism and propose a research agenda to address them. The goal is to clarify how metabolic processes interact with brain function at multiple levels. The authors focus on major substrates and their transporters, as well as cofactors like NAD+. The study also examines how brain metabolism changes during development and in pathological states. The purpose is to highlight areas where current understanding is incomplete. The authors seek to define research priorities that could advance the field. By addressing these gaps, the study hopes to inform future experimental and clinical investigations. The ultimate aim is to improve the understanding of brain energy dynamics in health and disease.

The authors conducted a comprehensive review of existing literature on brain energy metabolism. They analyzed biochemical, cellular, and subcellular aspects of brain metabolism. The study focused on major substrates like glucose, lactate, and ketones, as well as their transporters. The authors examined the roles of insulin and lipid droplets in brain metabolism. They also considered the emerging role of microglia in metabolic processes. The study explored the function of NAD+ as a cofactor and signaling molecule. The authors reviewed current understanding of metabolism in pathologies like traumatic brain injury and epilepsy. The roadmap was developed based on these synthesized findings and identified research gaps.

The study identified major gaps in understanding brain metabolism-substrate interrelationships. It highlighted unknowns in the roles of insulin and lipid droplets in brain function. The authors found that NAD+ remains a mysterious cofactor in brain signaling. The study revealed limited knowledge about microglial metabolism and its impact on brain function. The authors noted unresolved questions about brain metabolism during development and aging. Traumatic brain injury and epilepsy were identified as areas with significant metabolic uncertainties. The study emphasized the need for better imaging techniques to study brain metabolism in vivo. The findings suggest that future research should focus on these unresolved questions to advance the field.

The authors propose that future research should prioritize understanding brain metabolism-substrate interactions. They suggest that the roles of insulin and lipid droplets require further investigation. The study concludes that NAD+ remains a key area for future exploration. The authors emphasize the need to study microglial metabolism in more detail. The findings suggest that brain metabolism during development and aging is still poorly understood. The study highlights the importance of addressing metabolic changes in pathologies like traumatic brain injury. The authors propose that improved imaging techniques could help resolve current uncertainties. The roadmap aims to guide future research toward these unresolved questions.