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Characteristic neuropathology of leukomalacia in extremely low birth weight infants
K Deguchi1, K Oguchi, S Takashima
1Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, Tokyo, Japan.
Insights
Extremely low birth weight (ELBW) infants with periventricular leukomalacia (PVL) show widespread axonal damage and glial activation. Cytokine production, including tumor necrosis factor-alpha (TNF-alpha), is evident in these characteristic PVL lesions.
Area of Science:
- Neuroscience
- Neonatal research
- Pathology
Background:
- Periventricular leukomalacia (PVL) is a common brain injury in extremely low birth weight (ELBW) infants.
- The neuropathological mechanisms underlying PVL in ELBW infants require further elucidation.
Purpose of the Study:
- To investigate the neuropathological and immunohistochemical features of PVL in ELBW infants.
- To identify specific cellular and molecular markers associated with PVL progression in this vulnerable population.
Main Methods:
- Neuropathological examination of brain tissue from 13 ELBW infants with PVL.
- Immunohistochemical analysis for glial fibrillary acidic protein (GFAP), tumor necrosis factor-alpha (TNF-alpha), and beta-amyloid precursor protein (beta APP).
- Comparison with age-matched control ELBW infants.
Main Results:
- PVL exhibited a widespread distribution in the deep and intermediate white matter of ELBW infants.
- Increased GFAP-positive astrocytes, TNF-alpha-positive cells, and beta APP-positive axons were observed in PVL lesions.
- These markers were absent in control infants, indicating specific pathological changes in PVL.
Conclusions:
- Widespread axonal damage and glial activation, accompanied by cytokine production, are key features in the progression of PVL in ELBW infants.
- These findings highlight the complex inflammatory and degenerative processes involved in PVL pathogenesis.
Abstract:
Extremely low birth weight (ELBW) infants with periventricular leukomalacia (PVL) were examined by neuropathological and immunohistochemical methods. Thirteen ELBW infants of 85 infants with PVL, born at 23 to 27 weeks of gestation, showed a widespread type of distribution of PVL from the deep to intermediate white matter. Immunohistochemistry demonstrated glial fibrillary acidic protein (GFAP)-positive astrocytes to be increased in the deep white matter, often spreading to the intermediate white matter, in all cases of PVL. Tumor necrosis factor-alpha (TNF-alpha)-positive cells were found in the deep to intermediate white matter in 69% of PVL cases and appeared earlier, from 23 weeks of gestation, than in controls. beta-Amyloid precursor protein (beta APP)-positive axons were found around PVL in the deep to intermediate white matter in 85% of the cases. In age-matched control ELBW infants, GFAP-, TNF-alpha-, or beta APP-positive cells were never found. Therefore, in ELBW infants, widespread axonal damage and glial activation with cytokine production occur in the progression in characteristic PVL lesions.