The proteasome regulates intracellular processes, maintains biological homeostasis, and has shown great significance in the study of various diseases, such as neurodegenerative diseases, immune-related diseases, and cancer, especially in hematologic malignancies such as multiple myeloma (MM) and mantle cell lymphoma (MCL). All clinically used proteasome inhibitors bind to the active site of the proteasome and thus exhibit a competitive mechanism. The development of resistance and intolerance during treatment drives the search for inhibitors with different mechanisms of action. In this review, we provide an overview of noncompetitive proteasome inhibitors, including their mechanisms of action, function, possible applications, and their advantages and disadvantages compared with competitive inhibitors.
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http://dx.doi.org/10.1016/j.bioorg.2023.106507 | DOI Listing |
Cells
December 2024
State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, School of Marine Sciences, Ningbo University, Ningbo 315211, China.
Ubiquitin-conjugating enzyme E2 T (UBE2T) is a crucial E2 enzyme in the ubiquitin-proteasome system (UPS), playing a significant role in the ubiquitination of proteins and influencing a wide range of cellular processes, including proliferation, differentiation, apoptosis, invasion, and metabolism. Its overexpression has been implicated in various malignancies, such as lung adenocarcinoma, gastric cancer, pancreatic cancer, liver cancer, and ovarian cancer, where it correlates strongly with disease progression. UBE2T facilitates tumorigenesis and malignant behaviors by mediating essential functions such as DNA repair, apoptosis, cell cycle regulation, and the activation of oncogenic signaling pathways.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
University of New Mexico, Albuquerque, NM, USA
Background: Microglia are the brain resident immune cells that function as immune surveillance and engulf and clear damage‐associated molecular patterns (DAMPs), such as misfolded and oligomeric tau (TO) relevant Alzheimer’s disease (AD) and prevent nuclear factor‐kB (NF‐kB) mediated immune‐activation. IκBα is an endogenous inhibitor of the NF‐kB subunit p50‐p65/c‐Rel protein complex. IkBα’s association is precisely regulated in microglia to prevent excessive NF‐kB activation and neuroinflammation, which is one of the hallmarks of AD.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
ECU, Perth, Western Australia, Australia
Background: The autophagy lysosomal pathway (ALP) and the ubiquitin‐proteasome system (UPS) are key proteostasis mechanisms in cells, which are dysfunctional in AD and linked to protein aggregation and neuronal death. Autophagy is over activated in Alzheimer’s disease brain whereas UPS is severely impaired. Activating autophagy has received most attention, however recent evidence suggests that UPS can clear aggregate proteins and a potential therapeutic target for AD and protein misfolding diseases.
View Article and Find Full Text PDFNeurosci Bull
January 2025
Medical Science and Technology Innovation Center, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, 250117, China.
Ferroptosis is a form of cell death elicited by an imbalance in intracellular iron concentrations, leading to enhanced lipid peroxidation. In neurological disorders, both oxidative stress and mitochondrial damage can contribute to ferroptosis, resulting in nerve cell dysfunction and death. The ubiquitin-proteasome system (UPS) refers to a cellular pathway in which specific proteins are tagged with ubiquitin for recognition and degradation by the proteasome.
View Article and Find Full Text PDFJ Gen Virol
January 2025
Unidad de Medicina Molecular, Instituto de Biomedicina de UCLM (IB-UCLM), Universidad de Castilla-La Mancha (UCLM), Albacete, Spain.
Translation errors, impaired folding or environmental stressors (e.g. infection) can all lead to an increase in the presence of misfolded proteins.
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