TY - JOUR
T1 - Adult-born hippocampal neurons are more numerous, faster maturing, and more involved in behavior in rats than in mice
AU - Snyder, Jason S.
AU - Choe, Jessica S.
AU - Clifford, Meredith A.
AU - Jeurling, Sara I.
AU - Hurley, Patrick
AU - Brown, Ashly
AU - Kamhi, J. Frances
AU - Cameron, Heather A.
PY - 2009/11/18
Y1 - 2009/11/18
N2 - Neurons are born throughout adulthood in the hippocampus and show enhanced plasticity compared with mature neurons. However, there are conflicting reports on whether or not young neurons contribute to performance in behavioral tasks, and there is no clear relationship between the timing of maturation of young neurons and the duration of neurogenesis reduction in studies showing behavioral deficits. We asked whether these discrepancies could reflect differences in the properties of young neurons in mice and rats. We report that young neurons in adult rats show a mature neuronal marker profile and activity-induced immediate early gene expression 1-2 weeks earlier than those in mice. They are also twice as likely to escape cell death, and are 10 times more likely to be recruited into learning circuits. This comparison holds true in two different strains of mice, both of which show high rates of neurogenesis relative to other background strains. Differences in adult neurogenesis are not limited to the hippocampus, as the density of new neocortical neurons was 5 times greater in rats than in mice. Finally, in a test of function, we find that the contribution of young neurons to fear memory is much greater in rats than in mice. These results reveal substantial differences in new neuron plasticity and function between these two commonly studied rodent species.
AB - Neurons are born throughout adulthood in the hippocampus and show enhanced plasticity compared with mature neurons. However, there are conflicting reports on whether or not young neurons contribute to performance in behavioral tasks, and there is no clear relationship between the timing of maturation of young neurons and the duration of neurogenesis reduction in studies showing behavioral deficits. We asked whether these discrepancies could reflect differences in the properties of young neurons in mice and rats. We report that young neurons in adult rats show a mature neuronal marker profile and activity-induced immediate early gene expression 1-2 weeks earlier than those in mice. They are also twice as likely to escape cell death, and are 10 times more likely to be recruited into learning circuits. This comparison holds true in two different strains of mice, both of which show high rates of neurogenesis relative to other background strains. Differences in adult neurogenesis are not limited to the hippocampus, as the density of new neocortical neurons was 5 times greater in rats than in mice. Finally, in a test of function, we find that the contribution of young neurons to fear memory is much greater in rats than in mice. These results reveal substantial differences in new neuron plasticity and function between these two commonly studied rodent species.
UR - http://www.scopus.com/inward/record.url?scp=70949103595&partnerID=8YFLogxK
U2 - 10.1523/JNEUROSCI.1768-09.2009
DO - 10.1523/JNEUROSCI.1768-09.2009
M3 - Article
C2 - 19923282
AN - SCOPUS:70949103595
SN - 0270-6474
VL - 29
SP - 14484
EP - 14495
JO - Journal of Neuroscience
JF - Journal of Neuroscience
IS - 46
ER -