title: Calcium imaging of neuronal circuits in vivo using a circuit-tracing pseudorabies virus.
abstract: Pseudorabies virus (PRV) is a neuroinvasive virus of the herpes family that has a broad host range but does not infect higher-order primates. PRV characteristically travels along chains of synaptically connected neurons and has been used extensively for elucidating neural circuits in the peripheral and central nervous system in vivo. The recombinant virus PRV369 is an attenuated retrograde tracer that encodes G-CaMP2, a fluorescent calcium sensor protein that is stable at physiological pH and mammalian temperature. This protocol describes the use of PRV369 to express G-CaMP2 in a neuronal circuit and to monitor its activity in a living animal, specifically in the submandibular ganglia (SMG), the peripheral parasympathetic ganglia that innervate the salivary glands. The procedure describes the delivery of PRV369 to the glands and shows how SMG neurons can then be imaged post-inoculation to explore connectivity and activity.
authors.affiliation: Department of Molecular Biology and Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA.
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Granstedt
authors.forename: Bernd
authors.initials: B
authors.lastname: Kuhn
authors.forename: Samuel S-H
authors.initials: SS
authors.lastname: Wang
authors.forename: Lynn W
authors.initials: LW
authors.lastname: Enquist
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D005724:Ganglia / Q000166:cytology / Q000821:virology; D011558:Herpesvirus 1, Suid / Q000235:genetics / Q000502:physiology*; D052139:Intracellular Calcium-Sensing Proteins / Q000235:genetics / Q000378:metabolism; D051379:Mice; D009474:Neurons / Q000166:cytology* / Q000821:virology*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D013194:Staining and Labeling / Q000379:methods*
chemical_list: D052139:Intracellular Calcium-Sensing Proteins; D011994:Recombinant Proteins; D002118:Calcium