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Caffeine exposure ameliorates acute ischemic cell death in avian developing retina
D Pereira-Figueiredo1,2, R Brito3, D S M Araújo1,4
1Neurobiology of the Retina Laboratory, Fluminense Federal University, Niterói, RJ, Brazil.
Purinergic Signalling
|February 21, 2020
Summary
Caffeine exposure protected developing chick retinas from cell death by activating pro-survival pathways. This suggests caffeine may enhance retinal resistance to ischemia, a key factor in infant blindness.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Retinopathy of prematurity is a leading cause of infant blindness, often linked to hypoxic-ischemic events.
- Caffeine's effects on developing tissues are not fully understood, with potential for both benefit and harm.
- Adenosine receptors (A1 and A2A) are targets of caffeine, influencing neuronal function.
Purpose of the Study:
- To investigate caffeine's impact on retinal cell survival during synaptogenesis.
- To elucidate the signaling pathways involved in caffeine's neuroprotective effects in the developing retina.
- To determine the role of adenosine receptors in caffeine's protective mechanism.
Main Methods:
- Exposure of chick embryos to caffeine during synaptogenesis.
- Assessment of pro-survival signaling pathways (ERK, CREB, Akt, BDNF) and cell death.
- Pharmacological blockade of TrkB and NMDA receptors.
- Evaluation of chloride co-transporter KCC2 and GABA(A) receptor responses.
- Testing adenosine receptor antagonists (DPCPX).
Main Results:
- Caffeine activated pro-survival pathways (ERK, CREB, Akt phosphorylation, BDNF production) and reduced retinal cell death.
- TrkB receptor blockade and CREB inhibition abolished caffeine's protective effects.
- Caffeine increased NMDA receptor activity and delayed the developmental shift in GABA(A) receptor response.
- Adenosine A1 receptor antagonism mimicked caffeine's protective effects, indicating A1 receptor blockade as the mechanism.
Conclusions:
- In vivo caffeine exposure enhances retinal resistance to ischemia-induced cell death.
- The protective effect is mediated by activating survival pathways, including CREB phosphorylation and BDNF/TrkB signaling, likely via adenosine A1 receptor blockade.
- Caffeine's modulation of GABAergic signaling may facilitate NMDA receptor activity, contributing to neuroprotection.
