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PRE-RECORDED: NGF METABOLISM, ALZHEIMER’S PATHOLOGY AND PRECLINICAL BIOMARKERS
Abstract
Abstract Body
AIM: To study NGF trophic support in Health and Disease.
METHODS: Neurochemical and pharmacological procedures.
RESULTS: We have shown that this brain NGF Metabolic pathway
-Sustains the cholinergic phenotype of basal forebrain (BF) neurons.
-In Alzheimer’s disease (AD) pathology there is diminished proNGF to mNGF conversion and increased mNGF degradation
-In AD, the normal NGF synthesis and the failed pro-to-mature NGF conversion provokes a brain build-up of proNGF
-The above NGF metabolic deregulation is found in non-cognitively impaired (NCI) individuals with preclinical Aβ-amyloid pathology and remains physiologically normal in NCI brain samples lacking significant Aβ amyloidosis, proNGF levels correlating with cognitive scores.
-The NGF pathway is deregulated in Down Syndrome (DS) brains at clinical and preclinical AD stages.
-In DS body fluids, proNGF levels are increasingly elevated in their transition from DS without clinical AD to DS with clinical AD and predict subsequent cognitive decline.
CONCLUSIONS The failure of the NGF metabolic pathway, even at preclinical AD stages, would explain the early loss of trophic support to the NGF-dependent cholinergic neurons of the basal forebrain. The correction of this brain metabolic dysfunction at stages preclinical AD should prevent their neuronal atrophy and synaptic loses. The investigation of levels of key molecules of NGF metabolic pathway in blood and cerebrospinal fluids offers an opportunity to reveal the ongoing, silent, preclinical AD pathology.