Rungtip Soiampornkul. The reduction of neurotrophin-3-induced signal transduction by interleukin-1B in cultured cortical neurons : a model of alzheimer's disease . Doctoral Degree(Neurosciences). Mahidol University. : Mahidol University, 2004.
The reduction of neurotrophin-3-induced signal transduction by interleukin-1B in cultured cortical neurons : a model of alzheimer's disease
Abstract:
The cerebral concentration of IL-1β is known to be elevated in Alzheimers
disease. In view of critical roles played by mitogen-activated protein/kinase
extracellular signal-regulated protein kinase (MAPK/ERK), phosphatidylinositol 3-
kinase (PI-3K) /Akt phosphorylation and the cAMP response element-binding
protein (CREB) phosphorylation in neuronal plasticity, IL-1β might contribute to
the decline in cognitive functions preceding the overt manifestation of pathologies in
the disease. We examined the effects of IL-1β on NT-3 mediated signal
transduction in neuronal cell cultures from rat cerebral cortex, which is known to
play a crucial role for cell survival and differentiation of certain neuronal
populations as well as in neuronal plasticity. IL-1β, at sublethal level, was shown to
suppress the activation of NT-3-induced MAPK/ERK, Akt and CREB levels. This
suggests that IL-1β may interfere with the functions of NT-3 early in the course of
this disease. It was also shown that the interleukin-1 receptor antagonist (IL-1ra)
blocks the effect of IL-1β on its receptor and also increases the MAPK/ERK, and
CREB phosphorylation. We demonstrated that NT-3 protects cortical neurons
against apoptosis induced by serum deprivation. Our study indicates that NT-3 is a
neuroprotector which displays an anti-apoptotic effect on cultured cortical neurons.
This is likely to involve the pathways related to neuronal functions, which means that
NT-3 may protect against pathogenesis of Alzheimers disease