NRG and neurological diseases

DiseaseAgingADPDBTSZ
Main hallmarksGradual loss of cognitive functions. Developmental abnormalities in cortical circuitryNeuritic plaques. Neurofibrillary tangles.
Accumulation beta-amyloid peptide (Aβ)
Degeneration of DAergic neurons.
Deposition of α-synuclein
A brain injury that disrupts normal cellular and tissue function (b)Chronic mental illness presents highly heritable genetic factors. Likely a consequence of neurodevelopmental disorders
Role of NRGNeuroprotection, related to maximum lifespan in model systemsNeuroprotection. Decrement of Aβ peptide. Regulation of α-7 nAChRProtection of DAergic neurons, elevation of DA levels (a)Neuroprotection. Anti-inflammatory responses. Anti-apoptotic.
Beneficial effects on endothelial cells and BBB permeability
Genetic association (NRG and ErbB). High levels of NRG1 contribute to hippocampal synaptic plasticity dysfunction (c)
Main affected areasCortex, PFCHippocampus and cerebral cortexSubstantia nigra, hypothalamusAny areaCerebral cortex, PFC, hippocampus

Summary of the neurological diseases discussed in the review, showing their main features and how NRG is involved in those diseases. (a) In PD, ErbB4 is overexpressed and occurs with an excessive release of NRG; (b) BT: traumatic brain injury, stroke, etc.; (c) SZ: NRG1 concentration in serum is modulated by antipsychotic treatments and could be a therapeutic target. BBB: blood-brain barrier; nAChR: nicotinic ACh-R; BT: brain trauma; PD: Parkinson’s disease