Protracted neuronal maturation in a long-lived, highly social rodent

Area of Science:

• Neuroscience
• Gerontology
• Comparative Biology

Background:

• Naked mole-rats are exceptionally long-lived rodents (>37 years) and valuable biomedical models.
• They display significant neuroplasticity throughout their extended lifespan.
• Previous research has initiated the study of neurogenic patterns in this species.

Purpose of the Study:

• To test the hypothesis that neuronal maturation is prolonged in naked mole-rats.
• To characterize cell proliferation and neuronal maturation over 12 months.
• To investigate proliferation in social-decision making brain regions due to their eusocial structure.

Main Methods:

• Administered BrdU for seven consecutive days to label proliferating cells.
• Monitored cell proliferation and neuronal maturation in known neurogenic regions for 12 months.
• Measured co-expression of EdU, DCX, and NeuN to determine neuronal maturation timelines.

Main Results:

• Confirmed the subventricular zone as the primary source of adult cell proliferation.
• Indicated conservation of the rostral migratory stream in naked mole-rats.
• Found that while some neurons mature by 3 weeks, most mature at 5 months, with low hippocampal neurogenesis.

Conclusions:

• Naked mole-rat neuronal maturation timeline is unique, blending rodent and long-lived species characteristics.
• The subventricular zone and rostral migratory stream are conserved neurogenic regions.
• Data provide a timeline for future research on neurogenesis, longevity, and social behavior in naked mole-rats.