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The notch/STAT3-Ser/Hes3 signaling axis is a recently identified signal transduction branch of the notch [1] signaling pathway, originally shown to regulate the number of neural stem cells in culture and in the living adult brain.
The decrease in the electrochemical gradient causes a reduction in the electrical signals going to the brain. Thus, in this example, more light hitting the photoreceptor results in the transduction of a signal into fewer electrical impulses, effectively communicating that stimulus to the brain.
The upstream signaling pathway is triggered by the binding of a signaling molecule, a ligand, to a receiving molecule, a receptor. Receptors and ligands exist in many different forms, and only recognize/bond to particular molecules. Upstream extracellular signaling transduce a variety of intracellular cascades. [1]
The Insulin Signaling Pathway; The Sonic hedgehog Signaling Pathway; The Wnt signaling pathway; The JAK-STAT signaling pathway; The Adrenergic receptor Pathways; The Acetylcholine receptor Pathways; The Mitogen-activated protein kinase cascade; Conversely, negative cascades include events that are in a circular fashion, or can cause or be ...
The changes elicited by ligand binding (or signal sensing) in a receptor give rise to a biochemical cascade, which is a chain of biochemical events known as a signaling pathway. When signaling pathways interact with one another they form networks, which allow cellular responses to be coordinated, often by combinatorial signaling events. [2]
Trace amines have a modulatory effect on neurotransmission in monoamine pathways (i.e., dopamine, norepinephrine, and serotonin pathways) throughout the brain via signaling through trace amine-associated receptor 1. [45] [46] A brief comparison of these systems follows:
A neural pathway connects one part of the nervous system to another using bundles of axons called tracts. The optic tract that extends from the optic nerve is an example of a neural pathway because it connects the eye to the brain; additional pathways within the brain connect to the visual cortex.
The CBGTC loop has been implicated in many diseases. For example, in Parkinson's disease, degeneration of dopaminergic neurons leading to decreased activity of the excitatory pathway is thought to result in hypokinesia, [15] and in Huntington's disease, degeneration of GABAergic neurons driving the inhibitory pathway is thought to result in the jerky body movements. [2]
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