Immunohistochemical study of microtubule-associated protein 5 (MAP5) expression in the developing human brain
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J Ohyu1, H Yamanouchi, S Takashima
1Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, Kodaira, Tokyo, Japan. ohyu@ncnaxp.ncnp.go.jp
Abstract:
The expression of microtubule-associated protein 5 (MAP5) in the developing human brain was studied by means of an immunohistochemical method. In the cerebellum, MAP5 immunoreactivity appeared in the molecular layer and subcortical white matter from the early fetal age of 13 gestational weeks (GW), and temporally increased in the outer halves of the molecular layer and subcortical white matter at 36 GW to 2 months of age and 20 to 22 GW, respectively. In the cerebrum, it already appeared in the molecular layer and subcortical white matter from 13 GW, and was marked at 20 to 26 GW and 24 to 32 GW, respectively. Cortical pyramidal neurons gradually became immunoreactive from 28 GW to adolescence. Ependymal cilia were markedly positive in ventricular wall in all ages. In Western blot analyses, MAP5 showed two separate molecular weight bands. In the fetal period 320 kDa protein was prominent, but 300 kDa protein could be detected only at 11 years of age. Thus MAP5 was markedly expressed in growing axon in the fetal period and may be essential for the elongation and maturation as well as the function maintenance of axons and dendrites in developing human brain.
Insights
Microtubule-associated protein 5 (MAP5) is crucial for developing human brain structures. This protein supports axon and dendrite growth, maturation, and function throughout development.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Microtubule-associated protein 5 (MAP5) plays a role in neuronal development.
- Understanding MAP5 expression patterns is key to comprehending human brain development.
Purpose of the Study:
- To investigate the spatiotemporal expression of MAP5 in the developing human brain.
- To elucidate the role of MAP5 in axonal and dendritic development and maintenance.
Main Methods:
- Immunohistochemistry was used to detect MAP5 expression in fetal and postnatal human brain tissues.
- Western blot analysis was employed to examine MAP5 protein molecular weights.
Main Results:
- MAP5 immunoreactivity was observed early in fetal development (13 gestational weeks) in the cerebellum and cerebrum.
- Expression levels and localization changed temporally, with prominent expression in growing axons during the fetal period.
- Two distinct MAP5 protein bands (320 kDa and 300 kDa) were identified, with the 320 kDa band prominent in fetuses.
Conclusions:
- MAP5 is significantly expressed in the developing human brain, particularly in growing axons.
- MAP5 is likely essential for axon and dendrite elongation, maturation, and functional maintenance.
- The distinct protein bands suggest complex regulation or isoforms of MAP5 during brain development.
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