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Transforming growth factor-alpha immunoreactivity in the developing and adult brain
I Ferrer1, R Blanco, M Carulla
1Unidad Neuropatología, Hospital Príncipes España, Universidad Barcelona, Hospitalet de Llobregat, Spain.
Insights
Transforming growth factor-alpha is found in both neurons and glial cells across the developing and adult mammalian brain. This growth factor
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Transforming growth factor-alpha (TGF-α) is a signaling molecule implicated in cell growth and differentiation.
- Its presence and role in the mammalian central nervous system (CNS) require further elucidation.
Purpose of the Study:
- To investigate the distribution and cellular localization of TGF-α immunoreactivity in the developing and adult mammalian brain.
- To determine if TGF-α expression is dependent on developmental stage and cell type.
Main Methods:
- Immunohistochemistry using a specific monoclonal antibody against TGF-α.
- Examination of brain sections from developing and adult cats, rats, and adult humans.
- Analysis of immunoreactivity in both neuronal and glial cells across various brain regions.
Main Results:
- TGF-α immunoreactivity was detected in neurons throughout the developing and adult brain, including the cerebral cortex, hippocampus, and brainstem.
- Diffuse TGF-α immunoreactivity was observed in the white matter of young animals but diminished in adults.
- Both neurons and glial cells exhibited TGF-α immunoreactivity, with glial cell expression varying by developmental stage and brain region.
Conclusions:
- Transforming growth factor-alpha is widely distributed in the mammalian brain, present in both neurons and glial cells.
- TGF-α expression in the brain is developmentally regulated.
- These findings suggest a potential role for TGF-α in both the developing and adult CNS.
Abstract:
Transforming growth factor-alpha immunoreactivity is examined in the developing and adult brain of cats and rats, and in the adult human brain in cryostat sections immediately processed free-floating with a well-characterized monoclonal antibody which does not cross-react with epidermal growth factor. Transforming growth factor-alpha immunoreactivity is observed in neurons of the cerebral neocortex, subiculum, hippocampus, striatum, thalamus, amygdala, basal forebrain, mesencephalon, cerebellar cortex, dentate nucleus and brainstem during development and in adulthood. The intensity of the immunoreaction directly correlates with the size of the cytoplasm. Diffuse transforming growth factor-alpha immunoreactivity also occurs in the white matter of the cerebrum, cerebellum and brainstem in the kitten, but not in the adult cat. In addition to neurons, numbers of glial cells in the cerebellar white matter, brainstem and cerebral hemispheres during development, and a few glial cells in the cerebellar cortex, diencephalon, cerebral cortex and white matter in adults are strongly transforming growth factor-alpha immunoreactive. These results support the concept that transforming growth factor-alpha is widely distributed in the brain of mammals, localizes in both neurons and glial cells, and is development dependent. These findings also suggest that transforming growth factor-alpha may play a role in the developing and adult central nervous system.