GDNF, A Neuron-Derived Factor Upregulated in Glial Cells during Disease.

Publication date: Feb 07, 2020

In a healthy adult brain, glial cell line-derived neurotrophic factor (GDNF) is exclusively expressed by neurons, and, in some instances, it has also been shown to derive from a single neuronal subpopulation. Secreted GDNF acts in a paracrine fashion by forming a complex with the GDNF family receptor ?1 (GFR?1), which is mainly expressed by neurons and can act in cis as a membrane-bound factor or in trans as a soluble factor. The GDNF/GFR?1 complex signals through interactions with the “rearranged during transfection” (RET) receptor or via the neural cell adhesion molecule (NCAM) with a lower affinity. GDNF can also signal independently from GFR?1 by interacting with syndecan-3. RET, which is expressed by neurons involved in several pathways (nigro-striatal dopaminergic neurons, motor neurons, enteric neurons, sensory neurons, etc.), could be the main determinant of the specificity of GDNF’s pro-survival effect. In an injured brain, de novo expression of GDNF occurs in glial cells. Neuroinflammation has been reported to induce GDNF expression in activated astrocytes and microglia, infiltrating macrophages, nestin-positive reactive astrocytes, and neuron/glia (NG2) positive microglia-like cells. This disease-related GDNF overexpression can be either beneficial or detrimental depending on the localization in the brain and the level and duration of glial cell activation. Some reports also describe the upregulation of RET and GFR?1 in glial cells, suggesting that GDNF could modulate neuroinflammation.

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Duarte Azevedo, M., Sander, S., and Tenenbaum, L. GDNF, A Neuron-Derived Factor Upregulated in Glial Cells during Disease. 23976. 2020 J Clin Med (9):2.

Concepts Keywords
Adhesion Microglia
Affinity Astrocyte
Astrocytes RET proto-oncogene
Brain GFRα
Determinant GFRA1
Dopaminergic Glial cells
Enteric Neurons Proteins
GDNF Neurotrophic factors
Glia Branches of biology
Glial Cells disease
Glial Cells Alpha
Macrophages
Membrane
Microglia
Molecule
Motor Neurons
NCAM
Neuron
Neurons
Neurotrophic Factor
Paracrine
Receptor
RET
RET Receptor
Sensory Neurons
Striatal
Subpopulation
Transfection

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