December 2012
Volume 53, Issue 13
Free
Letters to the Editor  |   December 2012
Retinal Microglia
Author Affiliations & Notes
  • Jost B. Jonas
    Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University, Heidelberg, Germany; and the
  • Xiulan Zhang
    Glaucoma Department, Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China.
  • Rutledge Ellis-Behnke
    Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University, Heidelberg, Germany; and the
Investigative Ophthalmology & Visual Science December 2012, Vol.53, 8104. doi:10.1167/iovs.12-11270
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    • Get Citation

      Jost B. Jonas, Xiulan Zhang, Rutledge Ellis-Behnke; Retinal Microglia. Invest. Ophthalmol. Vis. Sci. 2012;53(13):8104. doi: 10.1167/iovs.12-11270.

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      © ARVO (1962-2015); The Authors (2016-present)

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We congratulate Dr. Liu and colleagues for their study on the in vivo tracking of retinal microglial cells after experimental damage to the optic nerve. 1 In a recent histomorphometric study, 2 the varying morphology of microglia cells has been differentiated into 6 stages of bidirectional microglial activation (A) and deactivation (R): 
 

“from stage 1A to 6A, the cell body size increased, the cell process number decreased, and the cell processes retracted and thickened, orienting toward the direction of the injury site; until stage 6A, when all processes disappeared. In contrast, in deactivation stages 6R to 1R, the microglia returned to the original site, exhibiting a stepwise retransformation to the original morphology. Thin highly branched processes re-formed in stage 1R, similar to those in stage 1A. This reverse transformation mirrored the forward transformation except in stages 6R to 1R: cells showed multiple nuclei which were slowly absorbed.”

 
We would ask Dr. Liu and colleagues, whether they were able to in vivo categorize the retinal microglial cells in their study by using a staging system similar to the one described above? Such a staging system could facilitate the description and quantification of changes in the retinal microglial system after damage to the retina and optic nerve. 
References
Liu S Li ZW Weinreb RN Tracking retinal microglia density in models of retinal ganglion cell damage. Invest Ophthalmol Vis Sci . 2012;53:6254–6262. [CrossRef] [PubMed]
Jonas RA Yuan TF Cheung SWH The spider effect: morphological and orientation classification of microglia in response to stimuli in vivo. PLoS One . 2012;7:e30763. [CrossRef] [PubMed]
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