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The Journal of Neuroscience, August 17, 2005, 25(33):7548-7557; doi:10.1523/JNEUROSCI.1019-05.2005

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Cellular/Molecular
Vesicle-Mediated Transport and Release of CCL21 in Endangered Neurons: A Possible Explanation for Microglia Activation Remote from a Primary Lesion

Eiko K. de Jong,¹ Ineke M. Dijkstra,¹ Marjolein Hensens,¹ Nieske Brouwer,¹ Machteld van Amerongen,¹ Robert S. B. Liem,² Hendrikus W. G. M. Boddeke,¹ and Knut Biber¹

Departments of ¹Medical Physiology and ²Cell Biology, Section of Electron Microscopy, University of Groningen, 9713 AV Groningen, The Netherlands

Whenever neurons in the CNS are injured, microglia become activated. In addition to local activation, microglia remote from the primary lesion site are stimulated. Because this so-called secondary activation of microglia is instrumental for long-term changes after neuronal injury, it is important to understand how microglia activity is controlled. The remote activation of microglia implies that the activating signals are transported along neuronal projections. However, the identity of these signals has not yet been identified. It is shown here that glutamate-treated neurons rapidly express and release the chemokine CCL21. We also provide evidence that neuronal CCL21 is packed in vesicles and transported throughout neuronal processes to reach presynaptic structures. Chemotaxis assays show that functional CCL21 is released from endangered neurons and activate microglia via the chemokine receptor CXCR3. Based on these findings, we suggest that neuronal CCL21 is important in directed neuron-microglia signaling and that this communication could account for the remote activation of microglia, far distant from a primary lesion.

Key words: neuron-microglia signaling; chemokines; CCL21; vesicle release; apoptosis; neuroinflammation

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Received Aug 20, 2004; revised July 5, 2005; accepted July 7, 2005.

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