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Hypoxic Processes Induce Complement Activation via Classical Pathway in Porcine Neuroretinas.
Ana M Mueller-Buehl1, Torsten Buehner1,2, Christiane Pfarrer2
1Experimental Eye Research Institute, University Eye Hospital, Ruhr-University Bochum, 44892 Bochum, Germany.
Cells
|December 24, 2021
Summary
Hypoxia and oxidative stress trigger distinct responses in retinal organ cultures, impacting retinal ganglion cells. Hypoxia activates the complement system, while oxidative stress induces inflammation, highlighting the immune system's role in retinal diseases.
Area of Science:
- Ophthalmology
- Immunology
- Neuroscience
Background:
- Retinal diseases like glaucoma and diabetic retinopathy lack cures, necessitating deeper understanding of their complex mechanisms.
- Oxidative stress and hypoxia are key pathological pathways implicated in various neuroretinal conditions.
- The immune system, particularly the complement system, plays a significant role in the pathogenesis of these diseases.
Purpose of the Study:
- To investigate the distinct pathomechanisms induced by oxidative stress and hypoxia in porcine retinal organ cultures.
- To elucidate the role of the complement system activation in response to these stressors.
- To evaluate porcine retinal organ cultures as a model for studying neuroretinal diseases.
Main Methods:
- Utilized established organ cultures of porcine retina.
- Induced oxidative stress and hypoxia to model retinal disease conditions.
- Analyzed retinal ganglion cell loss, apoptosis, complement system activation (C3+, MAC+, C1q+ microglia), and inflammatory marker expression (TNF, IL6, IL8).
Main Results:
- Both hypoxia and oxidative stress caused retinal ganglion cell loss and apoptosis.
- Hypoxia activated the complement system via the classical pathway, increasing C3+ and MAC+ cells and C1q+ microglia.
- Oxidative stress did not activate the complement system but led to significant inflammation with elevated TNF, IL6, and IL8 mRNA levels.
Conclusions:
- Hypoxia and oxidative stress induce differential responses in the retina, involving either immune system activation or inflammation.
- These findings support the involvement of the immune system in the development of retinal diseases.
- Porcine retinal organ cultures serve as a suitable model for investigating the pathomechanisms of various neuroretinal diseases.
