Neuronal apoptotic pathway

Neuronal apoptotic pathways are complex signaling cascades that govern programmed cell death within the central and peripheral nervous systems. These pathways are primarily divided into the intrinsic (mitochondrial) pathway, which responds to internal cellular stress such as DNA damage or oxidative stress, and the extrinsic pathway, which is activated by external death ligands binding to cell surface receptors like TNF-alpha (Yuan & Yankner, 2000). In a healthy context, these processes are vital for the precise pruning of neurons and synapses during brain development; however, their aberrant activation is a fundamental driver of neuronal loss in neurodegenerative diseases like Alzheimer's, Parkinson's, and Amyotrophic Lateral Sclerosis (Mattson, 2000). Therapeutic intervention in these pathways typically involves the use of small molecules or biologics designed to inhibit pro-apoptotic proteins, such as Caspase-3 or Bax, or to enhance the activity of anti-apoptotic factors like Bcl-2 (Bredesen et al., 2006). While targeting these pathways offers a direct route to neuroprotection, it presents significant clinical challenges, including the risk of systemic toxicity and the potential for promoting oncogenesis by preventing necessary cell death in other tissues (StatPearls, 2023).

Other names

Programmed cell death in neuronsNeuronal apoptosisIntrinsic and extrinsic apoptotic pathways in the CNS

Modulation of the apoptotic cascade by inhibiting pro-apoptotic enzymes (e.g., caspases), stabilizing mitochondrial membranes to prevent cytochrome c release, or blocking death receptor signaling to prevent neuronal loss (Bredesen et al., 2006).