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Updated: Jan 6, 2026
Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
Peptidomic analysis of hippocampal tissue for explore leptin neuroprotective effect on the preterm ischemia-hypoxia
1School of Biological Science & Medical Engineering, Southeast University, 2 Sipailou, Xuanwu District, Nanjing, Jiangsu, 210096, China; Department of Pediatrics, Zhongda Hospital Affiliated to Southeast University, 87 Dingjiaqiao, Gulou District, Nanjing, Jiangsu, 210009, China.
Insights
Leptin treatment alters hippocampal peptides in preterm brain damage models, revealing potential therapeutic targets. This study identifies key proteins and the ILK signaling pathway involved in leptin's neuroprotective effects.
Area of Science:
- Neuroscience
- Biochemistry
- Pediatrics
Background:
- Periventricular leukomalacia (PVL) is a common preterm infant injury with no effective treatments.
- Previous studies suggest leptin offers neuroprotection in animal models of preterm brain damage.
Purpose of the Study:
- To elucidate the neuroprotective mechanisms of leptin in preterm brain damage using comparative peptidomics.
- To identify specific peptides and pathways modulated by leptin treatment.
Main Methods:
- Comparative peptidomic profiling of hippocampal tissue using tandem mass tag (TMT) reagents and nano liquid chromatography-tandem mass spectrometry (nLC-MS/MS).
- Ingenuity Pathway Analysis (IPA) to identify roles of differentially expressed peptides.
Main Results:
- Identified and quantified 4164 peptides, with 238 differentially expressed (150 upregulated, 88 downregulated) in leptin-treated vs. control rats.
- Key peptides identified include those associated with microtubule-associated protein 1b (MAP1b), Elastin (Eln), and others.
- Repression of the ILK signaling pathway was found to be significant in leptin's neuroprotection.
Conclusions:
- Leptin treatment induces specific peptide changes in the hippocampus, suggesting novel bioactive peptides for neuroprotection.
- These findings advance understanding of leptin's neuroprotective mechanisms in preterm brain damage and potential therapeutic targets.
- Targeting the ILK signaling pathway may lead to new therapies for human nervous system disorders.
Abstract:
The most common injury of preterm infants is periventricular leukomalacia (PVL) and to date there is still no safe and effective treatment. In our previous studies, leptin has been found to have neuroprotective effects on the preterm ischemia-hypoxia brain damage model rats in animal behavior. To gain insight into the neuroprotective mechanisms of leptin on preterm brain damage model rats, we constructed a comparative peptidomic profiling of hippocampal tissue between leptin-treated after model and preterm ischemia-hypoxia brain damage model rats using a stable isobaric labeling strategy involving tandem mass tag reagents, followed by nano liquid chromatography tandem mass spectrometry. We identified and quantified 4164 peptides, 238 of which were differential expressed in hippocampal tissue in the two groups. A total of 150 peptides were up regulated and 88 peptides were down regulated. These peptides were imported into the Ingenuity Pathway Analysis (IPA) and identified putative roles in nervous system development, function and diseases. We concluded that the preterm ischemia-hypoxia brain damage model with leptin treatment induced peptides changes in hippocampus, and these peptides, especially for the peptides associated "microtubule-associated protein 1b (MAP1b), Elastin (Eln), Piccolo presynaptic cytomatrix protein (Pclo), Zinc finger homeobox 3(Zfhx3), Alpha-kinase 3(Alpk3) and Myosin XVA(Myo15a) ", could be candidate bio-active peptides and participate in neuroprotection of leptin. These may advance our current understanding of the mechanism of leptin's neuroprotective effect on preterm brain damage and may be involved in the etiology of preterm brain damage. Meanwhile, we found that repression of ILK signaling pathway plays a significant role in neuroprotection of leptin. A better understanding of the role of ILK signaling pathway in neuroprotective mechanisms will help scientists and researchers to develop selective, safe and efficacious drug for therapy against human nervous system disorders.
