Calorie Restriction Attenuates Transcriptional Aging Signatures in White Matter Oligodendrocytes and Immune Cells of the Monkey Brain.

During brain aging, terminally differentiated neuroglia exhibit metabolic dysfunction and increased oxidative damage, compromising their function. These cellular and molecular alterations impair their ability to maintain myelin sheath integrity, contributing to age-related white matter degradation. Calorie restriction (CR) is a well-established intervention that can slow biological aging and may reduce age-related metabolic alterations, thereby preserving the molecular function of aging glia. Here we present a single nucleus resolution, transcriptomics dataset evaluating the molecular profile of oligodendrocytes and microglia in the brain of aging rhesus monkeys following lifelong, 30% calorie restriction. Oligodendrocytes from CR subjects exhibited increased expression of myelin-related genes and showed enrichment in glycolytic and fatty acid biosynthetic pathways. In CR subjects, a subpopulation of oligodendrocytes upregulated cell adhesion gene, NLGN1 and were in closer proximity to axons. Microglia from CR subjects upregulated amino acid and peptide metabolism pathways and showed a reduced myelin debris signature. Our findings reveal cell-type specific transcriptional reprogramming in response to long term CR and highlight potential protective mechanisms against myelin pathology in the aging primate brain.