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DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
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Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Organotypic Retinal Explant Cultures from Macaque Monkey
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General pathophysiology in retinal degeneration.

Katherine J Wert1, Jonathan H Lin, Stephen H Tsang

  • 1Bernard and Shirlee Brown Glaucoma Laboratory, Departments of Ophthalmology, Pathology and Cell Biology, New York, N.Y., USA.

Developments in Ophthalmology
|April 16, 2014
PubMed
Summary
This summary is machine-generated.

Retinal degeneration, a common neural disease, involves complex genetic causes affecting vision. Understanding cell death mechanisms in photoreceptor degeneration is crucial for developing treatments for retinitis pigmentosa and similar conditions.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Retinal degeneration, including age-related macular degeneration and retinitis pigmentosa (RP), represents a significant global health challenge.
  • Genetic and allelic heterogeneity complicates the classification of retinal dystrophies, leading to ambiguous diagnoses due to similar clinical presentations.
  • Dysregulation of the phototransduction cascade, photoreceptor renewal/shedding, and retinol metabolism critically impacts retinal health.

Purpose of the Study:

  • To investigate the mechanisms of cell death in retinal degeneration, specifically focusing on the loss of phosphodiesterase (PDE6β) function in a mouse model of RP.
  • To elucidate the precise pathways linking apoptosis activation to PDE6β dysfunction.
  • To explore the potential role of CCAAT/-enhancer-binding protein homologous protein (CHOP) and the unfolded protein response (UPR) in photoreceptor cell death.

Main Methods:

  • Utilized a mouse model of retinitis pigmentosa (RP) to study rod cell loss.
  • Investigated the activation of apoptotic pathways and their connection to the loss of phosphodiesterase (PDE6β) function.
  • Examined the role of CCAAT/-enhancer-binding protein homologous protein (CHOP) and the unfolded protein response (UPR) in cell death mechanisms.

Main Results:

  • Apoptosis has been implicated in rod cell loss in RP mouse models.
  • The precise mechanisms linking apoptotic pathway activation to the loss of phosphodiesterase (PDE6β) function remain undefined.
  • The activation of apoptosis by CHOP, following UPR activation, is a potential contributor to cell death, though the exact mechanism is unknown.

Conclusions:

  • The mechanisms of cell death observed in PDE6 loss-of-function models may offer insights applicable to other key proteins in the phototransduction cascade.
  • Further research is needed to fully define the pathways connecting apoptosis and PDE6β dysfunction in retinal degeneration.
  • Understanding these mechanisms is vital for addressing the broader spectrum of retinal degenerative diseases.