title: Two-photon imaging of calcium in virally transfected striate cortical neurons of behaving monkey.
abstract: Two-photon scanning microscopy has advanced our understanding of neural signaling in non-mammalian species and mammals. Various developments are needed to perform two-photon scanning microscopy over prolonged periods in non-human primates performing a behavioral task. In striate cortex in two macaque monkeys, cortical neurons were transfected with a genetically encoded fluorescent calcium sensor, memTNXL, using AAV1 as a viral vector. By constructing an extremely rigid and stable apparatus holding both the two-photon scanning microscope and the monkey's head, single neurons were imaged at high magnification for prolonged periods with minimal motion artifacts for up to ten months. Structural images of single neurons were obtained at high magnification. Changes in calcium during visual stimulation were measured as the monkeys performed a fixation task. Overall, functional responses and orientation tuning curves were obtained in 18.8% of the 234 labeled and imaged neurons. This demonstrated that the two-photon scanning microscopy can be successfully obtained in behaving primates.
authors.affiliation: Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, New Jersey, United States of America.
authors.forename: Barbara
authors.initials: B
authors.lastname: Heider
authors.forename: Jason L
authors.initials: JL
authors.lastname: Nathanson
authors.forename: Ehud Y
authors.initials: EY
authors.lastname: Isacoff
authors.forename: Edward M
authors.initials: EM
authors.lastname: Callaway
authors.forename: Ralph M
authors.initials: RM
authors.lastname: Siegel
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D015374:Biosensing Techniques / Q000379:methods; D002118:Calcium / Q000378:metabolism*; D000229:Dependovirus / Q000235:genetics; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods; D005822:Genetic Vectors / Q000235:genetics; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism*; D008253:Macaca mulatta; D036641:Microscopy, Fluorescence, Multiphoton / Q000379:methods; D009474:Neurons / Q000378:metabolism*; D015203:Reproducibility of Results; D014162:Transfection; D014793:Visual Cortex / Q000166:cytology / Q000378:metabolism*
chemical_list: D008164:Luminescent Proteins; D002118:Calcium