Analysis Tools
vision/eye
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• tumor cells that invade the anterior eye chamber beneath the cornea are densely packed stage II cells surrounded by sparse regions of plexus with no synaptic densities or vesiclesin in the plexus or rosettes of these cells
• tumor cells have abundant mitochondria and mitotic figures; some rosettes have a central plexus made up of large, undifferentiated processes, with other rosettes having a central plexus containing neurons and synapses
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• areas of the plexus within the posterior chamber are composed of neuron-like processes having synaptic structures similar to horizontal/amacrine cells; this is seen in smaller areas of plexus in tumors
• processes are usually smaller in diameter (<0.5 um) but large ones of 1-3 um are observed occasionally; variety of synaptic arrangements occur and all types can be found in contacts among processes, while ribbon synapses are seen only in areas near photoreceptor cell bodies
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• significant disruptions in retinal morphology are observed by P12 to 13
• in diseased eyes, retina blastoma cells rupture the inner limiting membrane (ILM), particularly by the apex of vitreal protrusions that may be present; at these points, tumor cell bodies and associated vasculature can be seen
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• mice have much more aggressive, invasive form of retinoblastoma than Trp53-sufficient compound mutants; tumor size varies with age and genotype
• an early-stage tumor displayed a pronounced vitreal protrusion in one animal, and contained structures resembling neuronal processes like those in the plexiform layer of the normal retina
• in tumors, proteins usually found in amacrine/horizontal cells, including Gad65, Snap25, Calbindin, vGlut-1, E-cadherin, N-cadherin, synapsin, and Syntaxin-1 are expressed; these cells are considered to be differentiated
• cells positive for amacrine/horizontal cell markers (1.7-3.6 x 106 cells/tumor) are much more numerous than number of amacrine/horizontal cells in a normal retina
• regions of tumors negative for amacrine/horizontal markers contain more densely packed nuclei
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neoplasm
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• mice have much more aggressive, invasive form of retinoblastoma than Trp53-sufficient compound mutants; tumor size varies with age and genotype
• an early-stage tumor displayed a pronounced vitreal protrusion in one animal, and contained structures resembling neuronal processes like those in the plexiform layer of the normal retina
• in tumors, proteins usually found in amacrine/horizontal cells, including Gad65, Snap25, Calbindin, vGlut-1, E-cadherin, N-cadherin, synapsin, and Syntaxin-1 are expressed; these cells are considered to be differentiated
• cells positive for amacrine/horizontal cell markers (1.7-3.6 x 106 cells/tumor) are much more numerous than number of amacrine/horizontal cells in a normal retina
• regions of tumors negative for amacrine/horizontal markers contain more densely packed nuclei
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