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Neural Plasticity
Volume 2012 (2012), Article ID 425818, 6 pages
http://dx.doi.org/10.1155/2012/425818
Research Article

Calcium Imaging of Living Astrocytes in the Mouse Spinal Cord following Sensory Stimulation

Laboratorio di Morfologia delle Reti Neuronali, Dipartimento di Medicina Pubblica Clinica e Preventiva, Seconda Università di Napoli, 80100 Napoli, Italy

Received 25 July 2012; Accepted 2 September 2012

Academic Editor: Eduard Korkotian

Copyright © 2012 Giovanni Cirillo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Astrocytic Ca2+ dynamics have been extensively studied in ex vivo models; however, the recent development of two-photon microscopy and astrocyte-specific labeling has allowed the study of Ca2+ signaling in living central nervous system. Ca2+ waves in astrocytes have been described in cultured cells and slice preparations, but evidence for astrocytic activation during sensory activity is lacking. There are currently few methods to image living spinal cord: breathing and heart-beating artifacts have impeded the widespread application of this technique. We here imaged the living spinal cord by two-photon microscopy in C57BL6/J mice. Through pressurized injection, we specifically loaded spinal astrocytes using the red fluorescent dye sulforhodamine 101 (SR101) and imaged astrocytic Ca2+ levels with Oregon-Green BAPTA-1 (OGB). Then, we studied astrocytic Ca2+ levels at rest and after right electrical hind paw stimulation. Sensory stimulation significantly increased astrocytic Ca2+ levels within the superficial dorsal horn of the spinal cord compared to rest. In conclusion, in vivo morphofunctional imaging of living astrocytes in spinal cord revealed that astrocytes actively participate to sensory stimulation.