The Microscopy and Cell Analysis Core provides three complimentary high-end services to research and clinical investigators.
The core has one scanning electron microscope (SEM) and four transmission electron microscopes (TEMs). The TEMs are all 120-kilovolt instruments used for both clinical and research samples. Standard transmission and scanning electron microscopy, negative staining, and cryotomography methods are supported.
In addition, 3D reconstruction from serial thin sections and image averaging of negative-stained and cryotomography specimens are available to investigators. The lab also maintains specialized specimen preparation equipment, including microwave tissue processors, ultramicrotomes, a high vacuum evaporator, critical point dryer, sputter coater, Vitrobot and cryoultramicrotome.
Flow cytometry and cell sorting
The core has five analytical flow cytometers and three cell-sorting cytometers. Flow cytometric analysis and cell-sorting services allow characterization of properties of cells or particles through the use of fluorescent probes, lasers, advanced electronics, high-quality optics and specialized software.
Flow cytometry provides high-speed analysis and characterization of single cells or a particle in suspension. This technology enables investigators to quantitatively assess the properties of large numbers of individual cells. Data on apoptosis, transfection efficiency, cell-surface marker expression, intracellular protein expression, calcium flux and many other properties can be measured.
Cells exhibiting specific characteristics can be physically sorted from a mixed population and collected for culturing further studies using a cell-sorting cytometer. Single-cell RNA, cell cloning and cellular expansion are just a few of the downstream applications of sorting cells.
Instrumentation that can examine either tissue or single cells microscopically is provided using optical microscopy. Through the use of advanced imaging technologies, quantitative information or digital images can be obtained and stored.
Both upright and inverted fluorescence microscopes are available that can be interfaced to a variety of cameras and image-recording devices for image capture. A ratiometric microscopy workstation is provided for single-cell kinetic studies.
The confocal laser scanning microscopes can be used to optically section specimens, thus preserving ultrastructure registration better than conventional physical sectioning techniques. Compartmental localization of markers within a cell is possible, as is 3D reconstruction of serial images. Multiphoton microscopy allows investigators to image at high resolution, in thick specimen preparations and in deep (1-millimeter) tissue of living animals.
Finally, using the recently acquired superresolution technique with structured illumination and photo-activated localization microscopy, investigators can achieve high resolution (< 0.1 µm to 40 nm) of appropriately labeled proteins in cells and tissue preparations. Utilizing specialized software, quantization of image properties can be performed by macro programs written by core personnel.