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On average, the total numbers of dendritic branches at DIV7, DIV10, and DIV14 were 24.28 �� 0.72, 32.70 �� 1.26, and 39.53 �� 0.95, respectively, whereas the total lengths of branches http://www.selleckchem.com/products/carfilzomib-pr-171.html at DIV7, DIV10, and DIV14 were 439.31 �� 19.21, 902.05 �� 36.37, and 1450.68 �� 41.80 ��m, respectively, showing significant increase in branch total number and length during neuronal development (P http://www.selleckchem.com/products/azd9291.html at this age have passed the crucial developmental period and are relatively mature (Ning et al., 2007). We analyzed the number http://en.wikipedia.org/wiki/YES1 and the average length for each order of dendritic arbor. The number of dendritic branches of the second, third, and fourth order was notably increased after 10 ng/mL IL-2 treatment, and for most dendritic orders, the average length in the treated neurons was notably longer than the control neurons (Figs. 1D,E). Then we analyzed the effects of IL-2 on the density and motility of dendritic filopodia. Dendritic filopodia in control neurons were distributed along dendritic shafts at a density of 6.65 �� 0.26/100 ��m and had an average length of 6.06 �� 0.39 ��m. The ratio of mobile/total filopodia was 49.96 �� 18% (Figs. 2, 3). Treatment with 10 ng/mL IL-2 for 48 hr from DIV5 to DIV7 notably increased the motility of dendritic filopodia, causing a 30.93 �� 12.83% increase in motile filopodia/100 ��m (P 0.05, Figs. 3A,C). As the motility of filopodia was increased by IL-2, we then examined whether IL-2 affected the density of dendritic spines in mature neurons at DIV14. The cultured neurons were treated with 10 ng/mL IL-2 from DIV5 to DIV7, from DIV5 to DIV14 and from DIV12 to DIV14, and then were assessed at DIV14.