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A Microglial Function for the Nerve Growth Factor: Predictions of the Unpredictable
Alexia Tiberi1,2, Simona Capsoni1,3, Antonino Cattaneo1,4
1Bio@SNS Laboratory of Biology, Scuola Normale Superiore, 56127 Pisa, Italy.
Abstract:
Microglia are the only immune cell population present in the brain parenchyma. Their vantage position in the central nervous system (CNS) enables these myeloid cells to perform the most disparate of tasks: from the classical immune functions of fighting infections and surveilling the extracellular space for pathogens and damage, to sculpting the neuronal circuitry by pruning unnecessary synapses and assisting neurons in spine formation, aiding in the maintenance of brain homeostasis. The neurotrophin field has always been dominated by the neurocentric view that the primary target of these molecules must be neurons: this holds true even for the Nerve Growth Factor (NGF), which owes its popularity in the neuroscience community to its trophic and tropic activity towards sensory and sympathetic neurons in the peripheral nervous system, and cholinergic neurons in the CNS. The increasing evidence that microglia are an integral part of neuronal computation calls for a closer look as to whether these glial cells are capable of responding directly to NGF. In this review, we will first outline evidence in support of a role for NGF as a molecule mediating neuroimmune communication. Then, we will illustrate some of those non-immune features that have made microglial cells one of the hottest topics of this last decade. In conclusion, we will discuss evidence in support of a microglial function for NGF.
Insights
Nerve Growth Factor (NGF) may directly impact microglia, the brain's immune cells, challenging the neuron-centric view. This suggests NGF plays a role in neuroimmune communication and brain homeostasis.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the sole immune cells in the brain parenchyma, performing diverse functions from immune defense to synaptic remodeling.
- The neurotrophin field traditionally focuses on neuronal targets, particularly Nerve Growth Factor (NGF) for its effects on peripheral and central neurons.
- Emerging evidence highlights microglia's integral role in neuronal computation, prompting investigation into their direct response to NGF.
Purpose of the Study:
- To explore the potential of Nerve Growth Factor (NGF) to directly influence microglial cells.
- To examine the role of NGF in mediating neuroimmune communication.
- To review the non-immune functions of microglia and their potential interaction with NGF.
Main Methods:
- Literature review of existing studies on microglia, NGF, and neuroimmune interactions.
- Analysis of evidence supporting NGF's role in neuroimmune signaling.
- Examination of microglial functions beyond classical immunity.
Main Results:
- Evidence suggests NGF can mediate neuroimmune communication.
- Microglia exhibit numerous non-immune functions crucial for brain health.
- The study posits a direct functional role for NGF in microglia.
Conclusions:
- NGF may act directly on microglia, expanding its known functions beyond neuronal support.
- This interaction highlights a novel pathway for neuroimmune communication.
- Understanding NGF-microglia interactions is key to comprehending brain homeostasis and function.
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