Axonal Degeneration as a target for neuroprotection

Destruction programs are cellular mechanisms that have survival value when they operate under physiological control, but their malfunction could be deleterious for the organism. Apoptosis, or programmed cell death, is a well-known physiological destruction mechanism most apparent during development but persisting throughout the organism’s life. Other destruction programs are emerging as physiological processes that may not terminate in the destruction of the whole cell but only of restricted cellular domains. In the case of neurons, pruning of exuberant branches of terminal arborizations and degeneration of axons severed from their cell bodies are outstanding examples. Importantly, axonal degeneration is an early event in neurodegenerative condition including Alzheimer´s and Parkinson disease, as well as peripheral neuropathies. We are interested to define molecular players in the process of axonal degeneration to find therapeutic targets for neuroprotection.

Golgi staining of a mouse hippocampal section, with this technique, sparse neuronal labelling is obtained, which allows detailed analysis of individual neurons.

The degeneration of axons constitutes a salient feature shared by several neurodegenerative diseases that contributes to neuronal dysfunction and cell death. To date, the precise molecular and cellular mechanisms of axonal degeneration are under intense investigation. The morphological evidence indicates that axon degeneration as a consequence of aging and neurodegenerative diseases takes place in a retrograde fashion also known as dying back degeneration, which precedes cell death of the neuronal soma. Axon degeneration shares several characteristics with cell death by activation of the necroptotic signaling pathway, including mitochondrial dysfunction, ROS production, and intracellular calcium increase, and we have found that necroptosis inhibition by genetic or pharmacological means delays axonal degeneration in neurons from the peripheral and central nervous systems, as well as in model of Alzheimer´s and Parkinson Disease.

People involved

https://cib.umayor.cl/en/

Macarena Arrazola

PI collaborator

PhD in Biological Sciences from the Catholic University of Chile. Studying the contribution of necroptosis in the age-associated axonal degeneration of the hippocampus, and the impact of using pharmacological approaches to revert neuronal dysfunction and cognitive impairment during aging, proposing necroptosis as an attractive target for the future development of geroprotective tools to treat age-related disabilities.

Genesis Vega

Postdoctoral fellow

Bachelor’s degree in Biochemistry at the Universidad Austral de Chile. PhD in Sciences with mention in cellular and molecular biology at the Universidad Austral de Chile carried out at CECs and University of Heidelberg. Studying the role of NAD+ imbalance in the activation of necrosome and dysfunction of mitochondrial metabolism in chemotherapy-induced axonal degeneration in aged peripheral neurons.

Pedro Briceño

Research Assistant

Biologist and master of Biological sciences from University of Chile. In a model of chemotherapy-induced peripheral neuropathy, I’m investigating an axonal degeneration mechanism involving necroptosis activation. I’m focusing on two events that influence this process: the role of a decrease in the basal NAD+ pool and mitochondrial metabolism dysfunction.

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