DEVELOPMENT OF FEMTOSECOND SCANNING-LASER MICROSCOPY

飞秒扫描激光显微镜的发展

• 批准号: 7958837
• 负责人: DENNIS MICHAEL DACEY
• 金额: $ 15.76万
• 依托单位: UNIVERSITY OF WASHINGTON
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-05-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7958837
• 关键词: Calcium; Calcium Signaling; Cells; Characteristics; Collaborations; Color; Computer Retrieval of Information on Scientific Projects Database; Dendrites; Development; Diffuse; Excision; Funding; Goals; Grant; Image; Inner Limiting Membrane; Institution; Laser Scanning Microscopy; Lasers; Light; Macaca; Measures; Mechanics; Microscope; Modeling; Mus; Photons; Physiologic pulse; Primates; Research; Research Personnel; Resources; Retina; Retinal Cone; Salamander; Scanning; Signal Pathway; Source; Students; Synapses; System; Testing; Trees; United States National Institutes of Health; Whole-Cell Recordings; calcium green; digital; ganglion cell; neuronal cell body; response; retinal neuron; visual stimulus

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The goal of this project is to directly measure synaptic interactions on the dendritic trees of identified color opponent ganglion cells and to test the hypothesis that color opponency is determined by selective connections between cone-signal pathways and ganglion-cell dendrites. To achieve this aim we constructed a femtosecond, 2-photon scanning laser microscope for measuring light evoked calcium signals in the dendrites of retinal neurons. It has been modeled after the system originally developed by Denk and Detwiler at the Max Planck in Heidelberg and has now been extensively tested on intact mouse and salamander retina as well as macaque retina. In collaboration with Peter Detwiler and his students, we have successfully targeted both midget, parasol and other ganglion cells for whole cell recording in the intact macaque retina by imaging ganglion cell bodies and making whole-cell recordings after mechanical removal of the inner limiting membrane. Midget and parasol cells show characteristic and long lasting light responses in this recording configuration. The cell bodies and dendritic trees are then intracellularly loaded with Calcium Green via the recording pipette and dendritic branches are targeted for imaging calcium signals in response to diffuse light pulses. As found previously for salamander and mouse ganglion cells, macaque ganglion cell dendrites show clear and rapid changes in calcium concentration in response to light steps. Finally, we have incorporated a new visual stimulus, using a digital light projector, which will permit the application of cone-specific visual stimuli during dendritic recording.

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