Locus Coeruleusaren eragina Parkinson gaixotasunaren narriadura kognitiboan

Abstract

The locus coeruleus (LC) is a crucial noradrenergic nucleus located in the brainstem. It plays a central role in the pathophysiology of Parkinson’s disease (PD) and appears to undergo significant degeneration in its early stages. This structure contains approximately 45,000 to 50,000 neurons and is fundamental to neurophysiological functions such as memory, attention, and the regulation of the sleep-wake cycle. Due to its extensive connectivity with both cortical and subcortical regions, the LC serves as a key regulator of brain homeostasis. The vulnerability of the LC in PD is attributed to factors such as its high-energy demand and the pathological processes associated with the disease. These include the formation of Lewy bodies and the accumulation of neuromelanin, which contribute to oxidative and metabolic stress within the LC. The progressive loss of LC neurons leads to a range of non-motor symptoms in PD. Notably, the cognitive impairment associated with LC degeneration in PD has profound consequences. The progressive reduction of norepinephrine availability affects essential functions such as memory, attention, and cognitive flexibility, compromising not only intellectual performance but also autonomy and quality of life. Targeted treatments aimed at the noradrenergic system, such as atomoxetine or vagus nerve stimulation, have shown potential in mitigating cognitive deficits. Animal models have demonstrated that these interventions not only improve symptoms, but also exert neuroprotective effects, like reducing pathological protein accumulation and inflammation. Personalized therapeutic strategies may optimize quality of life and slow disease progression, highlighting the critical role of the LC in this neurodegenerative disorder.