Abstract:The multimerization of active compounds has emerged as
a successful
approach, mainly to address the multivalency of numerous biological
targets. Regarding the pharmaceutical prospect, carrying several active
ingredient units on the same synthetic scaffold was a practical approach
to enhance drug delivery or biological activity with a lower global
concentration. Various examples have highlighted better in
vivo stability and therapeutic efficiency through sustained
action over monomeric molecules. The synthesis … Show more
“…Apart from lysosome-acidifying nanoparticles (27, 34, 36, 45, 46), there are several other strategies such as small molecules that target lysosomal proton pump and ion channels that have been developed to restore lysosomal acidification. For example, C381 activates lysosomal vacuolar H + -ATPase and promotes lysosomal acidification in neurotoxin MPTP treated mouse model of PD (47).…”
Parkinson's disease (PD) is an age-related neurodegenerative disease characterized by histopathological hallmarks of Lewy bodies formed by accumulation of α-synuclein (αSyn) and progressive loss of dopaminergic neurons in the substantia nigrapars compactaof the midbrain, with clinical symptoms of motor deficits. Toxic protein accumulation of αSyn in PD is associated with autolysosomal acidification dysfunction that contributes to defective autophagy-lysosomal degradation system. While lysosome-acidifying nanoparticles have been applied as therapeutics to ameliorate dopaminergic neurodegeneration in neurotoxin mediated or αSyn aggregates induced mouse model of sporadic PD, lysosome-targeted approach has not yet been applied in synucleinopathy models of familial PD. Here, we report the first application of the new poly(ethylene tetrafluorosuccinate-co-succinate) (PEFSU)-based acidic nanoparticles (AcNPs) in A30P αSyn overexpressing SH-SY5Y cells andDrosophilamodels of PD. In the cellular model, we showed that AcNPs restore lysosomal acidification, promote autophagic clearance of αSyn, improve mitochondrial turnover and function, and rescue A30P αSyn induced death in SH-SY5Y cells. In theDrosophilamodel, we demonstrated that AcNPs enhance clearance of αSyn and rescue dopaminergic neuronal loss in fly brains and improve their locomotor activity. Our results highlight AcNPs as a new class of lysosome-acidifying therapeutic for treatment of PD and other proteinopathies in general.
“…Apart from lysosome-acidifying nanoparticles (27, 34, 36, 45, 46), there are several other strategies such as small molecules that target lysosomal proton pump and ion channels that have been developed to restore lysosomal acidification. For example, C381 activates lysosomal vacuolar H + -ATPase and promotes lysosomal acidification in neurotoxin MPTP treated mouse model of PD (47).…”
Parkinson's disease (PD) is an age-related neurodegenerative disease characterized by histopathological hallmarks of Lewy bodies formed by accumulation of α-synuclein (αSyn) and progressive loss of dopaminergic neurons in the substantia nigrapars compactaof the midbrain, with clinical symptoms of motor deficits. Toxic protein accumulation of αSyn in PD is associated with autolysosomal acidification dysfunction that contributes to defective autophagy-lysosomal degradation system. While lysosome-acidifying nanoparticles have been applied as therapeutics to ameliorate dopaminergic neurodegeneration in neurotoxin mediated or αSyn aggregates induced mouse model of sporadic PD, lysosome-targeted approach has not yet been applied in synucleinopathy models of familial PD. Here, we report the first application of the new poly(ethylene tetrafluorosuccinate-co-succinate) (PEFSU)-based acidic nanoparticles (AcNPs) in A30P αSyn overexpressing SH-SY5Y cells andDrosophilamodels of PD. In the cellular model, we showed that AcNPs restore lysosomal acidification, promote autophagic clearance of αSyn, improve mitochondrial turnover and function, and rescue A30P αSyn induced death in SH-SY5Y cells. In theDrosophilamodel, we demonstrated that AcNPs enhance clearance of αSyn and rescue dopaminergic neuronal loss in fly brains and improve their locomotor activity. Our results highlight AcNPs as a new class of lysosome-acidifying therapeutic for treatment of PD and other proteinopathies in general.
“…An alternative strategy to NPs is acidic NL-NEs that contain conjugated succinic acid which will be released via enzymatic cleavage for luminal acidification (Fig. 4 d) [ 84 , 93 ]. Fig.…”
Section: Restoring Lysosomal Acidification As a Therapeutic Interventionmentioning
Lysosomal acidification dysfunction has been implicated as a key driving factor in the pathogenesis of neurodegenerative diseases, including Alzheimer’s disease and Parkinson’s disease. Multiple genetic factors have been linked to lysosomal de-acidification through impairing the vacuolar-type ATPase and ion channels on the organelle membrane. Similar lysosomal abnormalities are also present in sporadic forms of neurodegeneration, although the underlying pathogenic mechanisms are unclear and remain to be investigated. Importantly, recent studies have revealed early occurrence of lysosomal acidification impairment before the onset of neurodegeneration and late-stage pathology. However, there is a lack of methods for organelle pH monitoring in vivo and a dearth of lysosome-acidifying therapeutic agents. Here, we summarize and present evidence for the notion of defective lysosomal acidification as an early indicator of neurodegeneration and urge the critical need for technological advancement in developing tools for lysosomal pH monitoring and detection both in vivo and for clinical applications. We further discuss current preclinical pharmacological agents that modulate lysosomal acidification, including small molecules and nanomedicine, and their potential clinical translation into lysosome-targeting therapies. Both timely detection of lysosomal dysfunction and development of therapeutics that restore lysosomal function represent paradigm shifts in targeting neurodegenerative diseases.
“…Likewise, the loss of lysosomal acidity has been shown to be accompanied by an accumulation of autophagosomes as a result of a decline in autophagy flux (see section 3). The restoration of lysosomal acidification through novel nanoparticles and small molecules has been shown to decrease the numbers of autophagosomes present in the cell, demonstrating an increase in autophagy flux while also enhancing the presence of healthy mitochondria, likely through the induction of mitophagy ( Vest et al, 2022 ; Brouillard et al, 2023 ; Zeng et al, 2023 ).…”
Neurodegenerative diseases are often characterized by hydrophobic inclusion bodies, and it may be the case that the aggregate-prone proteins that comprise these inclusion bodies are in fact the cause of neurotoxicity. Indeed, the appearance of protein aggregates leads to a proteostatic imbalance that causes various interruptions in physiological cellular processes, including lysosomal and mitochondrial dysfunction, as well as break down in calcium homeostasis. Oftentimes the approach to counteract proteotoxicity is taken to merely upregulate autophagy, measured by an increase in autophagosomes, without a deeper assessment of contributors toward effective turnover through autophagy. There are various ways in which autophagy is regulated ranging from the mammalian target of rapamycin (mTOR) to acetylation status of proteins. Healthy mitochondria and the intracellular energetic charge they preserve are key for the acidification status of lysosomes and thus ensuring effective clearance of components through the autophagy pathway. Both mitochondria and lysosomes have been shown to bear functional protein complexes that aid in the regulation of autophagy. Indeed, it may be the case that minimizing the proteins associated with the respective neurodegenerative pathology may be of greater importance than addressing molecularly their resulting inclusion bodies. It is in this context that this review will dissect the autophagy signaling pathway, its control and the manner in which it is molecularly and functionally connected with the mitochondrial and lysosomal system, as well as provide a summary of the role of autophagy dysfunction in driving neurodegenerative disease as a means to better position the potential of rapamycin-mediated bioactivities to control autophagy favorably.
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