Age-Dependent Regional Changes in the Rostral Migratory Stream
Neurobiology of Aging
Throughout life the subventricular zone (SVZ) is a source of new olfactory bulb (OB) interneurons. From the SVZ, neuroblasts migrate tangentially through the rostral migratory stream (RMS), a restricted route approximately 5 mm long in mice, reaching the OB within 10-14 days. Within the OB, neuroblasts migrate radially to the granule and glomerular layers where they differentiate into granule and periglomerular (PG) cells and integrate into existing synaptic circuits. SVZ neurogenesis decreases with age, and might be a factor in age-related olfactory deficits. However, the effect of aging on the RMS and on the differentiation of interneuron subpopulations remains poorly understood. Here, we examine RMS cytoarchitecture, neuroblast proliferation and clearance from the RMS, and PG cell subpopulations at 6, 12, 18, and 23 months of age. We find that aging affects the area occupied by newly generated cells within the RMS and regional proliferation, and the clearance of neuroblasts from the RMS and PG cell subpopulations and distribution remain stable.
PMID:11815645 | PMCID:PMC3153400
Mobley, Arie S, Alex K Bryant, Marion B Richard, Jessica H Brann, Stuart J Firestein, and Charles A Greer. “Age-Dependent Regional Changes in the Rostral Migratory Stream.” Neurobiology of Aging 34, no. 7 (July 2013): 1873–81. doi:10.1016/j.neurobiolaging.2013.01.015.
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