रेटिना धारा की morphometric विश्लेषण
Summary
इस वीडियो रेटिना की morphometric विश्लेषण है, जो भीतर परमाणु परत मोटाई मापने, (RGCs) रेटिना नाड़ीग्रन्थि कोशिकाओं की संख्या बढ़ाता और RGCs के आकार को मापने के तीन प्रकार को दर्शाता है. तकनीक morphometric विश्लेषण के लिए एक सरल लेकिन वैज्ञानिक मंच की पेशकश कर सकते हैं.
Abstract
Morphometric analyses of retinal sections have been used in examining retinal diseases. For examples, neuronal cells were significantly lost in the retinal ganglion cell layer (RGCL) in rat models with N-methyl-D-aspartate (NMDA)–induced excitotoxicity1, retinal ischemia-reperfusion injury2 and glaucoma3. Reduction of INL and inner plexiform layer (IPL) thicknesses were reversed with citicoline treatment in rats’ eyes subjected to kainic acid-mediated glutamate excitotoxicity4. Alteration of RGC density and soma sizes were observed with different drug treatments in eyes with elevated intraocular pressure3,5,6. Therefore, having objective methods of analyzing the retinal morphometries may be of great significance in evaluating retinal pathologies and the effectiveness of therapeutic strategies.
The retinal structure is multi-layers and several different kinds of neurons exist in the retina. The morphometric parameters of retina such as cell number, cell size and thickness of different layers are more complex than the cell culture system. Early on, these parameters can be detected using other commercial imaging software. The values are normally of relative value, and changing to the precise value may need further accurate calculation. Also, the tracing of the cell size and morphology may not be accurate and sensitive enough for statistic analysis, especially in the chronic glaucoma model. The measurements used in this protocol provided a more precise and easy way. And the absolute length of the line and size of the cell can be reported directly and easy to be copied to other files. For example, we traced the margin of the inner and outer most nuclei in the INL and formed a line then using the software to draw a 90 degree angle to measure the thickness. While without the help of the software, the line maybe oblique and the changing of retinal thickness may not be repeatable among individual observers. In addition, the number and density of RGCs can also be quantified. This protocol successfully decreases the variability in quantitating features of the retina, increases the sensitivity in detecting minimal changes.
This video will demonstrate three types of morphometric analyses of the retinal sections. They include measuring the INL thickness, quantifying the number of RGCs and measuring the sizes of RGCs in absolute value. These three analyses are carried out with Stereo Investigator (MBF Bioscience — MicroBrightField, Inc.). The technique can offer a simple but scientific platform for morphometric analyses.
Protocol
Discussion
1. कैसे एक और अधिक सटीक मोटाई माप प्राप्त करने के लिए?
आप "ज़ूम" बटन पर क्लिक करके छवि विस्तार कर सकते हैं और अनुरेखण विंडो में क्लिक करें छोड़ दिया है. लीग सीमा स्पष्ट रूप से देखा जा सकता है. यद…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
इस प्रयोगशाला में आंख अनुसंधान पर काम अमेरिकी स्वास्थ्य सहायक फाउंडेशन, Azalea (1972) बंदोबस्ती कोष, और हमारी प्राथिमीक लघु परियोजना निधि (20097176185) द्वारा समर्थित है.
Materials
| Name of the reagent | Tipo | Company | Catalogue number |
| Stereo Investigator | MBF Bioscience Analysis Software | MicroBright Field | |
| Microscope | Olympus BX51 | Olympus Corporation | BX51 |
Riferimenti
- Lam, T. T., Abler, A. S., Tso, M. O. N-Methyl-D-Aspartate (NMDA)–Induced Apoptosis in Rat Retina. Investigative Ophthalmology & Visual Science. 40, 2391-2397 (1999).
- Lam, T. T., Abler, A. S., Tso, M. O. Apoptosis and caspases after ischemia-reperfusion injury in rat retina. Invest. Ophthalmol. Vis. Sci. 40, 967-975 (1999).
- Luo, X. G., Chiu, K., Lau, H. S., Lee, V. W. H., Yung, K. K. L., So, K. F. The Selective Vulnerability of Retinal Ganglion Cells in Rat Chronic Ocular Hypertension Model at Early Phase. Cellular and Molecular Neurobiology. 29 (8), 1143-1151 (2009).
- Han, Y. S., Chung, I. Y., Park, J. M., Yu, J. M. Neuroprotective effect of citicoline on retinal cell damage induced by kainic acid in rats. Korean J. Ophthalmol. 19, 219-226 (2005).
- Hernandez, M., Urcola, J. H. Retinal ganglion cell neuroprotection in a rat model of glaucoma following brimonidine, latanoprost or combined treatments. Exp. Eye Res. 86, 798-806 (2008).
- Chan, H. C., Chang, R. C. C., Ip, A. K. C., Chiu, K., Yuen, W. H., Zee, S. Y., So, K. F. Neuroprotective effects of Lycium barbarum Lynn on protecting retinal ganglion cells in an ocular hypertension model of glaucoma. Experimental Neurology. 203, 269-273 (2007).
