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Calretinin-immunoreactive unipolar brush cells in the developing human cerebellum
1Neurobiology Research Group of the Hungarian Academy of Sciences and Semmelweis University, Budapest, Hungary.
Summary
Unipolar brush cells (UBCs) develop late in the human cerebellum, appearing after birth and continuing to mature into the first postnatal year. This suggests human cerebellar development extends beyond the initial year of life.
Area of Science:
- Neuroscience
- Developmental Biology
- Human Anatomy
Background:
- Unipolar brush cells (UBCs) are distinctive neuronal subtypes found in the cerebellum.
- Previous research in rodents and cats indicated a late developmental timeline for UBCs.
Purpose of the Study:
- To investigate the temporal and spatial development of UBCs in the human cerebellar vermis.
- To characterize the emergence and maturation patterns of UBCs during human fetal and early postnatal life.
Main Methods:
- Analysis of 23 normal human cerebellar vermis samples, ranging from 24th gestational week to 11th postnatal month.
- Calretinin-immunocytochemistry used to visualize and quantify UBCs in formaldehyde-fixed, paraffin-embedded tissue.
Main Results:
- UBCs were absent at the 28th gestational week but present in small numbers at birth, primarily in vestibular lobules.
- UBCs gradually increased in number and distribution from birth to 11 months, spreading rostro-caudally and proximo-distally.
- By 11 months, UBCs showed adult-like morphology but were less numerous than in adults, indicating continued maturation.
Conclusions:
- UBC development is a protracted process in the human cerebellum, extending beyond the first postnatal year.
- The late maturation of UBCs signifies that human cerebellar cytoarchitectural development is not complete by 12 months of age.
