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Amyloid β and Alzheimer’s Disease: Molecular Updates from Physiology to Pathology

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Neurobiology".

Deadline for manuscript submissions: closed (15 January 2021) | Viewed by 6857

Special Issue Editor


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Guest Editor
Italian National Research Council, Institute of Crystallography (IC), 95126 Catania, Italy
Interests: Alzheimer’s disease; molecular neurobiology; amyloid-β; primary cortical neurons; signal transduction; BDNF; insulin and insulin-like growth factor signaling in Alzheimer's disease; HSP60; Aβ and copper; small molecules and peptide inhibitors of Aβ aggregation
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Special Issue Information

Dear colleagues,

Alzheimer’s disease (AD) is still an incurable disease with an incidence that is expected to increase in the near future. In previous decades, the pathophysiology of AD has been extensively investigated. Several approaches have been employed to disclose the molecular mechanisms underlying the cellular dysfunctions typically observed in AD. From in vitro and in vivo findings, we have learned that Aβ oligomers (AβOs), rather than Aβ fibrils, are mainly responsible for the effects leading to neurodegeneration. They have shown a better correlation with the severity of the disease and, in line with this observation, were found to induce synaptic dysfunction in the early stage of the disease, promote oxidative stress, and interfere with the activation of important cellular receptors. However, besides these unquestionable roles of Aβ oligomers, the primary cause of Aβ over-production and aggregation is far from being completely clarified.

Moreover, after initial evidence that Aβ monomers are innocuous, an increasing amount of data have indicated that Aβ may have important physiological roles in neuronal activity. A more comprehensive understanding of Aβ functions, from physiology to the occurrence of AD pathological conditions, could contribute to the refinement of pharmacological interventions and the design of new drug candidates.

Most AD drugs have been projected to block Aβ production or aggregation. However, the targeting of all Aβ species, including monomers, might be the reason for the continuous failure of clinical trials. The recent encouraging results of antibodies which preferentially bind to toxic AβOs seem to support this view.

The aim of this Special Issue of IJMS is to collect, in a broader perspective, scientific papers as well as reviews of the current literature, that deal with amyloid beta peptide function in health and/or disease. All original works that look at the role of Aβ within and beyond the disease and contribute to the improvement of the molecular understanding of Alzheimer’s disease are welcome.

Dr. Maria Laura Giuffrida
Guest Editor

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Keywords

  • Alzheimer’s disease
  • Aβ monomers
  • Aβ oligomers
  • signal transduction
  • neuroprotection
  • anti- Aβ therapy

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Published Papers (2 papers)

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15 pages, 5030 KiB  
Article
Inhibitory Neural Network’s Impairments at Hippocampal CA1 LTP in an Aged Transgenic Mouse Model of Alzheimer’s Disease
by Hyeon Jeong Seo, Jung Eun Park, Seong-Min Choi, Taekyoung Kim, Soo Hyun Cho, Kyung-Hwa Lee, Woo Keun Song, Juhyun Song, Han-Seong Jeong, Dong Hyun Kim and Byeong C. Kim
Int. J. Mol. Sci. 2021, 22(2), 698; https://doi.org/10.3390/ijms22020698 - 12 Jan 2021
Cited by 10 | Viewed by 3202
Abstract
Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by a rapid accumulation of amyloid β (Aβ) protein in the hippocampus, which impairs synaptic structures and neuronal signal transmission, induces neuronal loss, and diminishes memory and cognitive functions. The present study investigated the impact [...] Read more.
Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by a rapid accumulation of amyloid β (Aβ) protein in the hippocampus, which impairs synaptic structures and neuronal signal transmission, induces neuronal loss, and diminishes memory and cognitive functions. The present study investigated the impact of neuregulin 1 (NRG1)-ErbB4 signaling on the impairment of neural networks underlying hippocampal long-term potentiation (LTP) in 5xFAD mice, a model of AD with greater symptom severity than that of TG2576 mice. Specifically, we observed parvalbumin (PV)-containing hippocampal interneurons, the effect of NRG1 on hippocampal LTP, and the functioning of learning and memory. We found a significant decrease in the number of PV interneurons in 11-month-old 5xFAD mice. Moreover, synaptic transmission in the 5xFAD mice decreased at 6 months of age. The 11-month-old transgenic AD mice showed fewer inhibitory PV neurons and impaired NRG1-ErbB4 signaling than did wild-type mice, indicating that the former exhibit the impairment of neuronal networks underlying LTP in the hippocampal Schaffer-collateral pathway. In conclusion, this study confirmed the impaired LTP in 5xFAD mice and its association with aberrant NRG1-ErbB signaling in the neuronal network. Full article
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12 pages, 1216 KiB  
Article
Mutation in Sodium-Glucose Cotransporter 2 Results in Down-Regulation of Amyloid Beta (A4) Precursor-Like Protein 1 in Young Age, Which May Lead to Poor Memory Retention in Old Age
by Keiko Unno, Yoshiichi Takagi, Tomokazu Konishi, Mitsuhiro Suzuki, Akiyuki Miyake, Takumi Kurotaki, Tadashi Hase, Shinichi Meguro, Atsuyoshi Shimada, Sanae Hasegawa-Ishii, Monira Pervin, Kyoko Taguchi and Yoriyuki Nakamura
Int. J. Mol. Sci. 2020, 21(15), 5579; https://doi.org/10.3390/ijms21155579 - 04 Aug 2020
Cited by 5 | Viewed by 3112
Abstract
Senescence-accelerated mouse prone 10 (SAMP10) exhibits cerebral atrophy and depression-like behavior. A line of SAMP10 with spontaneous mutation in the Slc5a2 gene encoding the sodium-glucose cotransporter (SGLT) 2 was named SAMP10/TaSlc-Slc5a2slc (SAMP10-ΔSglt2) and was identified as a renal diabetes model. In [...] Read more.
Senescence-accelerated mouse prone 10 (SAMP10) exhibits cerebral atrophy and depression-like behavior. A line of SAMP10 with spontaneous mutation in the Slc5a2 gene encoding the sodium-glucose cotransporter (SGLT) 2 was named SAMP10/TaSlc-Slc5a2slc (SAMP10-ΔSglt2) and was identified as a renal diabetes model. In contrast, a line of SAMP10 with no mutation in SGLT2 (SAMP10/TaIdrSlc, SAMP10(+)) was recently established under a specific pathogen-free condition. Here, we examined the mutation effect in SGLT2 on brain function and longevity. No differences were found in the survival curve, depression-like behavior, and age-related brain atrophy between SAMP10-ΔSglt2 and SAMP10(+). However, memory retention was lower in SAMP10-ΔSglt2 mice than SAMP10(+). Amyloid beta (A4) precursor-like protein 1 (Aplp1) expression was significantly lower in the hippocampus of SAMP10-ΔSGLT2 than in SAMP10(+) at 2 months of age, but was similar at 12 months of age. CaM kinase-like vesicle association (Camkv) expression was remarkably lower in SAMP10(+). These genes have been reported to be involved in dendrite function. Amyloid precursor proteins have been reported to involve in maintaining homeostasis of glucose and insulin. These results suggest that mutation in SGLT2 results in down-regulation of Aplp1 in young age, which can lead to poor memory retention in old age. Full article
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