Myofibroblast and extracellular matrix origins in proliferative vitreoretinopathy

  • Richard M. FeistJr.
  • Jeffery L. King
  • Robert Morris
  • C. Douglas Witherspoon
  • Clyde Guidry



To evaluate origins of the fibrocontractive cell populations and their relation to collagens I and II in proliferative vitreoretinopathy (PVR).


Human PVR membranes were evaluated by indirect immunofluorescence for GFAP, cytokeratin-18 (CK-18), α-smooth muscle actin (αSMA), collagens I and II. Collagen expression by porcine Müller and retinal pigment epithelial cells (RPE) was evaluated using RT-PCR of RNA harvested from freshly isolated primary and proliferating cultures.


Collagen I was detected in all PVR samples and was widely distributed in the extracellular matrix. In contrast, collagen II was present in only two of the ten samples and was localized to thin, acellular bands near the border of the tissues. Using cell type-specific markers CK-18 and GFAP, RPE and glia were localized to the collagen I-rich matrices. Cells positive for GFAP and CK-18 can also co-express αSMA. Normal and proliferating RPE express collagen I, but Müller cells show no evidence of collagen I expression until they proliferate in culture. In contrast, normal RPE and Müller cells contain message for collagen II which is lost shortly after introduction into culture.


Collagen I appears to be the predominate fibrillar collagen in human PVR membranes and collagen II a comparatively minor component. Müller cells and RPE are physically associated with the collagen I matrix and are capable of expressing this protein suggesting that they are the origin. It also appears that the majority of myofibroblasts in PVR membranes are derived from either RPE or Müller cells suggesting that they play a major role in membrane development.


Müller Collagen Epiretinal Myofibroblast Proliferative Vitreoretinopathy 



Grant information

NIH T35 HL007473

Conflict of interest

No. The authors of this manuscript have full control of all primary data and they agree to allow Graefe’s Archive for Clinical and Experimental Ophthalmology to review their data if requested.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Richard M. FeistJr.
    • 1
  • Jeffery L. King
    • 2
  • Robert Morris
    • 3
  • C. Douglas Witherspoon
    • 3
  • Clyde Guidry
    • 3
  1. 1.University of Alabama School of MedicineBirminghamUSA
  2. 2.Department of OphthalmologyUniversity of Alabama School of MedicineBirminghamUSA
  3. 3.University of Alabama School of MedicineBirminghamUSA

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