NGF receptor (p75)-immunoreactivity in the developing primate basal ganglia

Area of Science:

• Neuroscience
• Developmental Biology
• Neuroanatomy

Background:

• The p75 nerve growth factor receptor (NGFr) plays a role in neuronal development and survival.
• Understanding the distribution of NGFr in the developing basal ganglia is crucial for elucidating its function in primate brain development.

Purpose of the Study:

• To map the distribution of NGFr in the developing human basal ganglia from mid-gestation through adulthood.
• To investigate the potential role of NGFr in the development of specific basal ganglia nuclei and pathways.

Main Methods:

• Immunohistochemical analysis of human fetal and adult basal ganglia specimens.
• Examination of NGFr expression in the caudate nucleus, putamen, globus pallidus, and subthalamic nucleus across different developmental stages.

Main Results:

• NGFr-immunoreactive neurons were found in the putamen (weeks 16-26) and globus pallidus (weeks 16-26), with fewer in the globus pallidus at week 40.
• Dense NGFr-immunoreactive terminal-like staining was observed in the subthalamic nucleus during mid-gestation (weeks 21-26), absent in adulthood.
• NGFr-immunoreactive fibers were present in the putamen, originating from the basal forebrain.

Conclusions:

• NGF receptor-mediated mechanisms are implicated in primate basal ganglia development.
• NGF receptors appear to have a limited role in primate neostriatal development, possibly acting before week 16.
• An NGFr/trophic interaction is suggested to be essential for the development of the pallidal-subthalamic nucleus pathway.