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A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
Published on: May 16, 2015
Bax inhibiting peptide reduces apoptosis in neonatal rat hypoxic-ischemic brain damage
Meng-Ya Sun1, Kai-Jie Cui2, Mao-Min Yu3
1The Affiliated Hospital of Qingdao University 16th on Jiangsu Road, Shinan District, Qingdao 266003, Shandong Province, China.
Insights
Bax-inhibiting peptide (BIP) reduces nerve cell apoptosis in a neonatal hypoxic-ischemic encephalopathy (HIE) rat model. This peptide demonstrates potential as a neuroprotective drug for HIE, mitigating brain damage.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Neonatal hypoxic-ischemic encephalopathy (HIE) is a severe condition leading to brain damage and apoptosis in newborns.
- Hypoxic-ischemic brain damage (HIBD) is a significant cause of neonatal mortality and long-term neurological deficits.
Purpose of the Study:
- To investigate the neuroprotective potential of Bax-inhibiting peptide (BIP) in a neonatal rat model of HIBD.
- To determine if BIP can reduce neuronal apoptosis and associated biochemical markers following HIBD.
Main Methods:
- Wistar rat pups were subjected to HIBD and treated with either saline or BIP.
- Histopathological analysis (H&E stain, TUNEL assay) and Western blot were used to assess brain tissue damage and protein expression.
- Levels of apoptosis markers, including cytochrome c and caspase-3, were quantified.
Main Results:
- HIBD significantly increased TUNEL-positive cells and expression of cytochrome c and caspase-3 compared to sham-operated controls.
- BIP treatment markedly reduced TUNEL-positive cells and the expression of cytochrome c and caspase-3 in the hippocampus.
- Neurobehavioral alterations were observed in saline-treated pups, with BIP showing a trend towards improvement.
Conclusions:
- BIP exhibits significant neuroprotective effects in neonatal HIBD by inhibiting nerve cell apoptosis.
- The mechanism involves the downregulation of cytochrome c and caspase-3 pathways.
- BIP holds promise as a therapeutic agent for neonatal HIE.
Abstract:
Neonatal hypoxic ischemic encephalopathy (HIE) has been reported to induce apoptosis in neonates. We, therefore, analyzed the ability of Bax-inhibiting peptide (BIP) to provide neuroprotective effects during hypoxic-ischemic brain damage (HIBD). Seven-day-old wistar rat pups (n = 198) were randomly divided into a sham-operated group (Group S, n = 18), saline group (Group C, n = 90) and BIP group (Group B, n = 90). Pathological changes in the cerebral tissues of rat pups were analyzed using hematoxylin and eosin stain, TUNEL and Western blot. The expression of cytochrome c and caspase-3 was determined using western blot technique. Rat pups demonstrated neurobehavioral alteration in Groups C and B. TUNEL-positive cells in the left hippocampus were significantly increased in Group C and Group B after HIBD (P < 0.01) when compared with Group S. There was a marked reduction in TUNEL positive cells in subgroups B1 through B4 when compared with the respective subgroups C1 through C5. Compared with Group S, the expression of caspase-3 and cytochrome c was significantly increased in Groups C and B (P < 0.01). The difference in expression of caspase-3 and cytochrome c between subgroups B1 through B4 and C1 through C4 was significant (P < 0.01). In conclusions, the neuro-protective effect of BIP was due to a reduction of nerve cell apoptosis in our neonatal HIE rat model. We propose that BIP has potential as a neuro-protective drug in neonatal HIE cases.
