Chronic treatment with melatonin stimulates dendrite maturation and complexity in adult hippocampal neurogenesis of mice
Article first published online: 29 SEP 2010
© 2010 The Authors. Journal of Pineal Research © 2010 John Wiley & Sons A/S
Journal of Pineal Research
Volume 50, Issue 1, pages 29–37, January 2011
How to Cite
Ramirez-Rodriguez, G., Ortíz-López, L., Domínguez-Alonso, A., Benítez-King, G. A. and Kempermann, G. (2011), Chronic treatment with melatonin stimulates dendrite maturation and complexity in adult hippocampal neurogenesis of mice. Journal of Pineal Research, 50: 29–37. doi: 10.1111/j.1600-079X.2010.00802.x
- Issue published online: 9 DEC 2010
- Article first published online: 29 SEP 2010
- Received April 20, 2010; accepted July 7, 2010.
- adult neurogenesis;
Abstract: In the course of adult hippocampal neurogenesis, the postmitotic maturation and survival phase is associated with dendrite maturation. Melatonin modulates the survival of new neurons with relative specificity. During this phase, the new neurons express microtubule-associated protein doublecortin (DCX). Here, we show that the entire population of cells expressing DCX is increased after 14 days of treatment with melatonin. As melatonin also affects microtubule polymerization which is important for neuritogenesis and dendritogenesis, we studied the consequences of chronic melatonin administration on dendrite maturation of DCX-positive cells. Treatment with melatonin increased the number of DCX-positive immature neurons with more complex dendrites. Sholl analysis revealed that melatonin treatment lead to greater complexity of the dendritic tree. In addition, melatonin increased the total volume of the granular cell layer. Besides its survival-promoting effect, melatonin thus also increases dendritic maturation in adult neurogenesis. This might open the opportunity of using melatonin as an adjuvant in attempts to extrinsically stimulate adult hippocampal neurogenesis in neuropsychiatric disease, dementia or cognitive ageing.