title: Loss of Müller's cells and photoreceptors in macular telangiectasia type 2.
abstract: OBJECTIVE
  To correlate postmortem histology from a patient with macular telangiectasia (MacTel) type 2 with previously recorded clinical imaging data.
  
  
  METHODS
  Observational clinicopathologic case report.
  
  
  METHODS
  The distribution of retinal blood vessels was used to map the location of serial wax sections in color fundus and optical coherence tomography (OCT) images. Fluorescent immunohistochemistry was used to visualize markers for Müller's cells (vimentin and retinaldehyde-binding protein 1), photoreceptors (L-M opsin, rhodopsin, and cytochrome oxidase 2), and the outer limiting membrane (OLM) (zonula occludens 1 and occludin).
  
  
  METHODS
  Distribution of specific markers in immunohistochemistry on retinal sections through the fovea in relation to clinical data.
  
  
  RESULTS
  The clinically recorded region of macular pigment loss in the macula correlated well with Müller's cell depletion. The OCT data showed a loss of the photoreceptor inner segment/outer segment (IS/OS) junction in the central retina, which correlated well with rod loss but not with cone loss. Markers for the OLM were lost where Müller's cells were lost.
  
  
  CONCLUSIONS
  We have confirmed our previous finding of Müller's cell loss in MacTel type 2 and have shown that the area of Müller's cell loss matches the area of macular pigment depletion. In this patient, the IS/OS junction seen by OCT was absent in a region where rods were depleted but cones were still present.
authors.affiliation: UCL Institute of Ophthalmology, University College London, London, United Kingdom.
authors.forename: Michael B
authors.initials: MB
authors.lastname: Powner
authors.forename: Mark C
authors.initials: MC
authors.lastname: Gillies
authors.forename: Meidong
authors.initials: M
authors.lastname: Zhu
authors.forename: Kristis
authors.initials: K
authors.lastname: Vevis
authors.forename: Alex P
authors.initials: AP
authors.lastname: Hunyor
authors.forename: Marcus
authors.initials: M
authors.lastname: Fruttiger
mesh_terms: D015415:Biomarkers / Q000378:metabolism; D001786:Blood Glucose / Q000378:metabolism; D002352:Carrier Proteins / Q000378:metabolism; D003576:Electron Transport Complex IV / Q000378:metabolism; D063928:Ependymoglial Cells / Q000378:metabolism / Q000473:pathology*; D005260:Female; D005451:Fluorescein Angiography; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D008875:Middle Aged; D055355:Opsins / Q000378:metabolism; D020419:Photoreceptor Cells, Vertebrate / Q000378:metabolism / Q000473:pathology*; D058456:Retinal Telangiectasis / Q000175:diagnosis* / Q000378:metabolism; D012243:Rhodopsin / Q000378:metabolism; D041623:Tomography, Optical Coherence; D014746:Vimentin / Q000378:metabolism
chemical_list: C020932:11-cis-retinal-binding protein; D015415:Biomarkers; D001786:Blood Glucose; D002352:Carrier Proteins; D055355:Opsins; D014746:Vimentin; D012243:Rhodopsin; D003576:Electron Transport Complex IV