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Mouse Eye Enucleation for Remote High-throughput Phenotyping
Published on: November 19, 2011
Neuron-specific TGF-beta signaling deficiency results in retinal detachment and cataracts in mice
Yasuyuki Honjo1, Chandrasekharam N Nagineni, Jonas Larsson
1Functional Genomics Section, Craniofacial Developmental Biology and Regeneration Branch, National Institute of Dental and Craniofacial Research, Bethesda, MD 20892, USA.
Abstract:
We generated a mouse model (cKO) with a conditional deletion of TGF-beta signaling in the retinal neurons by crossing TGF-beta receptor I (TGF-beta RI) floxed mice with nestin-Cre mice. Almost all of the newborn cKO mice had retinal detachment at the retinal pigment epithelium (RPE)/photoreceptor layer junction of the neurosensory retina (NSR). The immunostaining for chondroitin-6-sulfate showed a very weak reaction in cKO mice in contrast to intense staining in the photoreceptor layer in wild-type mice. Macroscopic cataracts, in one or both eyes, were observed in 50% of the mice by 6 months of age, starting as early as the first month after birth. The cKO mouse model demonstrates that the TGF-beta signaling deficiency in retinal cells leads to decreased levels of chondroitin sulfate proteoglycan in the retinal interphotoreceptor matrix. This in turn causes retinal detachment due to the loss of adhesion of the NSR to RPE.
Insights
Transforming growth factor-beta (TGF-beta) signaling is crucial for retinal health. Deficiency in TGF-beta signaling in retinal cells causes chondroitin sulfate proteoglycan reduction, leading to neurosensory retina detachment.
Area of Science:
- Ophthalmology
- Developmental Biology
- Cell Signaling
Background:
- Transforming growth factor-beta (TGF-beta) signaling plays a vital role in ocular development and homeostasis.
- Dysregulation of TGF-beta signaling is implicated in various retinal pathologies.
Purpose of the Study:
- To investigate the role of TGF-beta signaling in retinal neuron development and function.
- To establish a mouse model for studying TGF-beta signaling deficiency in the retina.
Main Methods:
- Generation of a conditional knockout (cKO) mouse model by crossing TGF-beta receptor I (TGF-beta RI) floxed mice with nestin-Cre mice.
- Histological and immunostaining analyses to assess retinal structure and proteoglycan levels.
- Ophthalmic examination for macroscopic abnormalities like cataracts and retinal detachment.
Main Results:
- Newborn cKO mice exhibited significant retinal detachment at the neurosensory retina (NSR)/retinal pigment epithelium (RPE) junction.
- Chondroitin-6-sulfate staining was markedly reduced in cKO mice compared to wild-type controls.
- Macroscopic cataracts were observed in 50% of cKO mice by 6 months of age.
Conclusions:
- TGF-beta signaling deficiency in retinal cells leads to decreased chondroitin sulfate proteoglycan in the interphotoreceptor matrix.
- This reduction in proteoglycan compromises the adhesion of the NSR to the RPE, causing retinal detachment.
- The cKO mouse model provides a valuable tool for studying the impact of TGF-beta signaling on retinal integrity.
