J Korean Ophthalmol Soc.  2010 Nov;51(11):1504-1512. 10.3341/jkos.2010.51.11.1504.

Ultrastructure of Rapidly Proliferating Preretinal Membrane of Very Extensive Ischemic Diabetic Retinopathy

Affiliations
  • 1HanGil Eye Hospital, Incheon, Korea.
  • 2Department of Ophthalmology, Hanyang University College of Medicine, Seoul, Korea. brlee@hanyang.ac.kr

Abstract

PURPOSE
Using transmission electron microscopy (TEM), we studied the ultrastructures of rapidly proliferating preretinal membranes of young patients with very extensive ischemic proliferative diabetic retinopathy and diabetes with uncontrollable blood sugar level.
METHODS
Nine cases of preretinal membranes were obtained from six eyes of five patients with rapidly progressed proliferative diabetic retinopathy (mean age, 35 years) during vitrectomy. We obtained each preretinal membrane bimanually as one single sheet membrane using intraocular scissors and forceps. Each tissue was fixed in 3% glutaraldehyde in the operating room. All specimens were prepared and studied using TEM.
RESULTS
The preretinal membranes were composed of blood vessels and some interstitial cells. The blood vessels within the preretinal membranes varied in developmental stages, from the immature stage to the mature stage. The blood vessels were highly active, in that primitive cells showed a large nucleus and prominent chromatin clumping with abundant cytoplasm. Highly active fibroblast-like cells were also noted.
CONCLUSIONS
We observed highly active angiogenesis in preretinal membranes, which rapidly proliferated in cases of severe retinal ischemia in young diabetes patients. This is the first report of such a finding, which may help to explain the poor prognosis of this disease modality.

Keyword

Capillary nonperfusion; Diabetic retinopathy; Preretinal membrane; Transmission electron microscopy

MeSH Terms

Blood Glucose
Blood Vessels
Chromatin
Cytoplasm
Diabetic Retinopathy
Eye
Glutaral
Humans
Ischemia
Membranes
Microscopy, Electron, Transmission
Operating Rooms
Prognosis
Retinaldehyde
Surgical Instruments
Vitrectomy
Blood Glucose
Chromatin
Glutaral
Retinaldehyde

Figure

  • Figure 1. A 39-year-old male had diabetes mellitus for 15 years. Very extensive capillary nonperfusion is observed on the fundus fluorescein angiography.

  • Figure 2. A 38-year-old male had had diabetes mellitus for 8 years. (A, B) In the left eye, very extensive capillary non-perfusion was observed in fundus fluorescein angiography. (C) There was mild vitreous hemorrhage and fibrovascular membrane in superotemporal macular area in left eye. Instant panretinal argon laser photocoagulation was performed. (D) After 4 months, despite of successful laser application, the more dense fibrovascular membrane and severe vitreous hemorrhage were observed on the entire macula. A pars plana vitrectomy and membrane peeling was performed.

  • Figure 3. A 50-year-old male had diabetes mellitus for 10 years. (A, B) Extensive capillary nonperfusion with neovascularization was observed in the right eye in the initial fundus fluorescein angiography (A, B, C). Instant panretinal laser photocoagulation was performed. (D) After 2 months, despite of complete and favorable laser application, extensive preretinal hemorrhage has occurred over the entire macula in the right eye. A pars plana vitrectomy was performed.

  • Figure 4. A 46-year-old patient had had diabetes mellitus for 14 years. (A, B, C) In right eye, there was wide capillary nonperfusion in fluorescein angiography. (D) There were mild vitreous and preretinal hemorrhage and pre-retinal membrane in superior retina from optic nerve in right eye. Panretinal argon laser photocoagulation was performed. After 3 months, the preretinal membrane rapidly proliferated to entire macula. A pars plana vitrectomy was performed.

  • Figure 5. A 38-year-old patient had had diabetes mellitus for 10 years. (A, B) There was wide capillary non-perfusion in fluorescein angiography. (C) There were severe vitreous hemorrhage and preretinal membrane in superotemporal retina from optic nerve in right eye. Panretinal argon laser photocoagulation was performed. (D) After 4 months, the preretinal membrane rapidly proliferated to entire macula. Pars plana vitrectomy was performed.

  • Figure 6. Transmission electron micrograph of primitive cell. Presence of primitive cell (asterisk) within collagen fiber. The primitive cell has large nucleus and prominent chromatin clumping with scanty cytoplasm. Prominent villous processes are also observed (arrowhead). Bar indicates 2 μ m.

  • Figure 7. Transmission electron micrograph showing primitive vascular cell. The primitive cells have large nucleus and chromatin clumping with scanty cytoplasm. The primitive cells form vascular sheet like structure (A). A lumen (L)-like space is also noted (B). The primitive vascular cells have varying stage of electron density. Bar indicates A: 4 μ m; B: 5 μ m.

  • Figure 8. Transmission electron micrograph of more developed primitive vascular cells. The vascular cells composed of vascular pericyte (P), vascular endothelial cell (E) and basement membrane (arrowheads). Macrophage (M) is also noted. Bar indicates 5 μ m.

  • Figure 9. Transmission electron micrograph of matured vessel. The vascular endothelial cell (E) and pericyte (P) are shown. The nucleus of vascular endothelial cell has prominent nucleoli with chromatin clumping. The vascular endothelial cell has prominent villous processes. Bar indicates 3 μ m.


Reference

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