Neuroprotection by Caffeine in Hyperoxia-Induced Neonatal Brain Injury
Stefanie Endesfelder1, Ulrike Weichelt2, Evelyn Strauß3
1Department of Neonatology, Charité, Universitätsmedizin Berlin, 13353 Berlin, Germany. stefanie.endesfelder@charite.de.
Insights
Caffeine protects the developing brain from oxidative stress and inflammation, common in premature infants. This study shows caffeine reduces brain damage markers and promotes protective responses in a neonatal rat model.
Area of Science:
- Neuroscience
- Biochemistry
- Neonatal Research
Background:
- Prematurity can lead to
- oxygen radical disease of prematurity
- due to oxidative stress and free radical damage.
- Caffeine is known to scavenge free radicals and may reduce brain damage in preterm infants.
Purpose of the Study:
- To investigate caffeine's effects on oxidative stress, inflammation, apoptosis, and extracellular matrix in the developing brain of neonatal rats exposed to hyperoxia.
- To evaluate caffeine's neuroprotective potential in a model relevant to human fetal brain development.
Main Methods:
- Neonatal Wistar rats (postnatal Day 6) were pre-treated with caffeine.
- Rats were exposed to 80% oxygen for 24 and 48 hours.
- Assessed oxidative stress markers, antioxidant responses, inflammatory cytokines, transcription factors, apoptosis, and extracellular matrix.
Main Results:
- Caffeine reduced oxidative stress markers (heme oxygenase-1, lipid peroxidation, hydrogen peroxide, GCLC) and promoted antioxidant responses (superoxide dismutase, peroxiredoxin 1, sulfiredoxin 1).
- Caffeine down-regulated pro-inflammatory cytokines, modulated redox-sensitive transcription factors (Nrf2/Keap1, NFκB), and reduced pro-apoptotic effectors (PARP-1, AIF, caspase-3).
- Caffeine diminished extracellular matrix degeneration (MMP-2, TIMP-1/2).
Conclusions:
- Caffeine exhibits pleiotropic neuroprotective effects in the developing brain.
- Its benefits stem from potent anti-oxidant, anti-inflammatory, and anti-apoptotic properties.
- Caffeine is a promising therapeutic agent for preventing brain injury in premature neonates.
Abstract:
Sequelae of prematurity triggered by oxidative stress and free radical-mediated tissue damage have coined the term "oxygen radical disease of prematurity". Caffeine, a potent free radical scavenger and adenosine receptor antagonist, reduces rates of brain damage in preterm infants. In the present study, we investigated the effects of caffeine on oxidative stress markers, anti-oxidative response, inflammation, redox-sensitive transcription factors, apoptosis, and extracellular matrix following the induction of hyperoxia in neonatal rats. The brain of a rat pups at postnatal Day 6 (P6) corresponds to that of a human fetal brain at 28-32 weeks gestation and the neonatal rat is an ideal model in which to investigate effects of oxidative stress and neuroprotection of caffeine on the developing brain. Six-day-old Wistar rats were pre-treated with caffeine and exposed to 80% oxygen for 24 and 48 h. Caffeine reduced oxidative stress marker (heme oxygenase-1, lipid peroxidation, hydrogen peroxide, and glutamate-cysteine ligase catalytic subunit (GCLC)), promoted anti-oxidative response (superoxide dismutase, peroxiredoxin 1, and sulfiredoxin 1), down-regulated pro-inflammatory cytokines, modulated redox-sensitive transcription factor expression (Nrf2/Keap1, and NFκB), reduced pro-apoptotic effectors (poly (ADP-ribose) polymerase-1 (PARP-1), apoptosis inducing factor (AIF), and caspase-3), and diminished extracellular matrix degeneration (matrix metalloproteinases (MMP) 2, and inhibitor of metalloproteinase (TIMP) 1/2). Our study affirms that caffeine is a pleiotropic neuroprotective drug in the developing brain due to its anti-oxidant, anti-inflammatory, and anti-apoptotic properties.
