BACKGROUND Islet amyloid deposition and reducedβ-cell mass are pathological hallmarks in type 2 diabetes mellitus subjects.To date,the pathological features of the islets in diabetes secondary to pancreatic ductal ad...BACKGROUND Islet amyloid deposition and reducedβ-cell mass are pathological hallmarks in type 2 diabetes mellitus subjects.To date,the pathological features of the islets in diabetes secondary to pancreatic ductal adenocarcinoma(PDAC)have not been specifically addressed.AIM To provide further insight into the relationship between islet amyloid deposition of the residual pancreas in PDAC patients and to explore whether regional differences(proximal vs distal residual pancreas)are associated with islet amyloid deposition.METHODS We retrospectively collected clinical information and pancreatic tissue removed from tumors of 45 PDAC patients,including 14 patients with normal glucose tolerance(NGT),16 patients with prediabetes and 15 new-onset diabetes(NOD)patients diagnosed before surgery by an oral glucose tolerance test at West China Hospital from July 2017 to June 2020.Pancreatic volume was calculated by multiplying the estimated area of pancreatic tissue on each image slice by the interval between slices based on abdominal computer tomography scans.Several sections of paraffin-embedded pancreas specimens from both the proximal and/or distal regions remote from the tumor were stained as follows:(1)Hematoxylin and eosin for general histological appearance;(2)hematoxylin and insulin for the determination of fractionalβ-cell area(immunohistochemistry);and(3)quadruple insulin,glucagon,thioflavin T and DAPI staining for the determination ofβ-cell area,α-cell area and amyloid deposits.RESULTS Screening for pancreatic histologic features revealed that duct obstruction with islet amyloid deposition,fibrosis and marked acinar atrophy were robust in the distal pancreatic regions but much less robust in the proximal regions,especially in the prediabetes and NOD groups.Consistent with this finding,the remnant pancreatic volume was markedly decreased in the NOD group by nearly one-half compared with that in the NGT group(37.35±12.16 cm^(3) vs 69.79±18.17 cm^(3),P<0.001).As expected,islets that stained positive for amyloid(islet amyloid density)were found in the majority of PDAC cases.The proportion of amyloid/islet area(severity of amyloid deposition)was significantly higher in both prediabetes and NOD patients than in NGT patients(P=0.002;P<0.0001,respectively).We further examined the regional differences in islet amyloid deposits.Islet amyloid deposit density was robustly increased by approximately 8-fold in the distal regions compared with that in the proximal regions in the prediabetes and NOD groups(3.98%±3.39%vs 0.50%±0.72%,P=0.01;12.03%vs 1.51%,P=0.001,respectively).CONCLUSION In conclusion,these findings suggest that robust alterations of the distal pancreas due to tumors can disturb islet function and structure with islet amyloid formation,which may be associated with the pathogenesis of NOD secondary to PDAC.展开更多
The familiar amyloid polyneuropathy(FAP) is a rare autosomal-dominant systemic amyloidosis. Amyloid deposition occurs more frequently and extensively in the vitq. The increase in intraocular pressure(IOP) is a result ...The familiar amyloid polyneuropathy(FAP) is a rare autosomal-dominant systemic amyloidosis. Amyloid deposition occurs more frequently and extensively in the vitq. The increase in intraocular pressure(IOP) is a result of deposition of transthyretin(TTR) in trabecular meshwork. Rarely, the amyloid deposition in anterior segment can be more exuberant than in posterior segment. A 42 years old man, with FAP(Val30Met mutation), liver transplantation in 1997. He was asymptomatic, without any significant ocular abnormality until 2011. In 2011 he had an episode of pain in right eye(RE). Scalloped pupils, pupillary amyloid deposits and subtle vitreous opacities were detected. The IOP was 40 mmHg in RE and 28 mmHg in left eye(LE) with open angle. Optical coherence tomography detected a temporal superior retinal nerve fiber layer defect in LE and perimetry was normal. Topical timolol was initiated, and brimonidine was subsequently added to improve IOP control, which was achieved with topical medication until last evaluation. No progression occurred since 2011. Actually, with longer life expectancies, there is an increased risk of ocular involvement in FAP, even after liver transplantation. Although rare, a more exuberant amyloid deposition in anterior segment vs posterior segment can occur, and supports an important role of amyloid production in ciliary pigment epithelium in these patients. Medical control of IOP and a stable course are unusual in this secondary glaucoma. Ophthalmologists have an important task in the follow-up of patients and early diagnosis of risk factors for secondary glaucoma, such as scalloped pupils with amyloid deposits.展开更多
Primary cutaneous marginal zone B-cell lymphoma (MZL) is considered a cutaneous counterpart of extranodal MZL of mucosa-associated lymphoid tissue and an indolent lymphoma. Amyloid deposition in this tumor is very rar...Primary cutaneous marginal zone B-cell lymphoma (MZL) is considered a cutaneous counterpart of extranodal MZL of mucosa-associated lymphoid tissue and an indolent lymphoma. Amyloid deposition in this tumor is very rare. We report here a case of primary cutaneous MZL with massive amyloid deposition. The tumor disseminated to the dura and mimicked primary dural MZL. The patient had a four year history of the recurrence cutaneous lesions with a misdiagnosis of amyloidosis. The correct diagnosis was made after the metastatic dural lesion was confirmed by radiology, pathology and molecular biology approaches. It is of crucial importance for differential diagnosis to avoid misdiagnosis and the patients are indeed required long-term regular examinations and treatment because of the possibility of recurrence or dissemination.展开更多
Aim: The abnormal accumulation, assembly and deposition of the amyloid β-protein (Aβ) are prominent pathological features of patients with Alzheimer’s disease (AD) and related disorders. A number of factors in the ...Aim: The abnormal accumulation, assembly and deposition of the amyloid β-protein (Aβ) are prominent pathological features of patients with Alzheimer’s disease (AD) and related disorders. A number of factors in the brain can influence Aβ accumulation and associated pathologies. The aim of the present study was to determine the consequences of deleting nitric oxide synthase (NOS) 3, the endothelial form of NOS, in Tg-5xFAD mice, a model of parenchymal AD-like amyloid pathology. Methods: Tg-5xFAD mice were bred with NOS3-/- mice. Cohorts of Tg-5xFAD mice and bigenic Tg-5xFAD/NOS3-/- mice were aged to six months followed by collection of the blood and brain tissues from the mice for biochemical and pathological analyses. Results: ELISA analyses show that the absence of NOS3 results in elevated levels of cerebral and plasma Aβ peptides in Tg-5xFAD mice. Immunohistochemical analyses show that the absence of NOS3 increased the amount of parenchymal Aβ deposition and fibrillar amyloid accumulation in Tg-5xFAD mice. The elevated levels of Aβ were not due to changes in the expression levels of transgene encoded human amyloid precursor protein (APP), endogenous β-secretase, or increased proteolytic processing of APP. Conclusions: The results from this study suggest that the loss of NOS3 activity enhances Aβ pathology in Tg-5xFAD mice. These findings are similar to previous studies of NOS2 deletion suggesting that reduced NOS activity and NO levels enhance amyloid-associated pathologies in human APP transgenic mice.展开更多
Alzheimer’s disease is a neurodegenerative disease resulting from deficits in synaptic transmission and homeostasis.The Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neur...Alzheimer’s disease is a neurodegenerative disease resulting from deficits in synaptic transmission and homeostasis.The Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neurodegeneration and ultimately disrupting the operational abilities in daily life,leaving patients incapacitated.Repetitive transcranial magnetic stimulation is a cost-effective,neuro-modulatory technique used for multiple neurological conditions.Over the past two decades,it has been widely used to predict cognitive decline;identify pathophysiological markers;promote neuroplasticity;and assess brain excitability,plasticity,and connectivity.It has also been applied to patients with dementia,because it can yield facilitatory effects on cognition and promote brain recovery after a neurological insult.However,its therapeutic effectiveness at the molecular and synaptic levels has not been elucidated because of a limited number of studies.This study aimed to characterize the neurobiological changes following repetitive transcranial magnetic stimulation treatment,evaluate its effects on synaptic plasticity,and identify the associated mechanisms.This review essentially focuses on changes in the pathology,amyloidogenesis,and clearance pathways,given that amyloid deposition is a major hypothesis in the pathogenesis of Alzheimer’s disease.Apoptotic mechanisms associated with repetitive transcranial magnetic stimulation procedures and different pathways mediating gene transcription,which are closely related to the neural regeneration process,are also highlighted.Finally,we discuss the outcomes of animal studies in which neuroplasticity is modulated and assessed at the structural and functional levels by using repetitive transcranial magnetic stimulation,with the aim to highlight future directions for better clinical translations.展开更多
A reduction in adult neurogenesis is associated with behavioral abnormalities in patients with Alzheimer's disease.Consequently,enhancing adult neurogenesis represents a promising therapeutic approach for mitigati...A reduction in adult neurogenesis is associated with behavioral abnormalities in patients with Alzheimer's disease.Consequently,enhancing adult neurogenesis represents a promising therapeutic approach for mitigating disease symptoms and progression.Nonetheless,nonpharmacological interventions aimed at inducing adult neurogenesis are currently limited.Although individual non-pharmacological interventions,such as aerobic exercise,acousto-optic stimulation,and olfactory stimulation,have shown limited capacity to improve neurogenesis and cognitive function in patients with Alzheimer's disease,the therapeutic effect of a strategy that combines these interventions has not been fully explored.In this study,we observed an age-dependent decrease in adult neurogenesis and a concurrent increase in amyloid-beta accumulation in the hippocampus of amyloid precursor protein/presenilin 1 mice aged 2-8 months.Amyloid deposition became evident at 4 months,while neurogenesis declined by 6 months,further deteriorating as the disease progressed.However,following a 4-week multifactor stimulation protocol,which encompassed treadmill running(46 min/d,10 m/min,6 days per week),40 Hz acousto-optic stimulation(1 hour/day,6 days/week),and olfactory stimulation(1 hour/day,6 days/week),we found a significant increase in the number of newborn cells(5'-bromo-2'-deoxyuridine-positive cells),immature neurons(doublecortin-positive cells),newborn immature neurons(5'-bromo-2'-deoxyuridine-positive/doublecortin-positive cells),and newborn astrocytes(5'-bromo-2'-deoxyuridine-positive/glial fibrillary acidic protein-positive cells).Additionally,the amyloid-beta load in the hippocampus decreased.These findings suggest that multifactor stimulation can enhance adult hippocampal neurogenesis and mitigate amyloid-beta neuropathology in amyloid precursor protein/presenilin 1 mice.Furthermore,cognitive abilities were improved,and depressive symptoms were alleviated in amyloid precursor protein/presenilin 1 mice following multifactor stimulation,as evidenced by Morris water maze,novel object recognition,forced swimming test,and tail suspension test results.Notably,the efficacy of multifactor stimulation in consolidating immature neurons persisted for at least 2weeks after treatment cessation.At the molecular level,multifactor stimulation upregulated the expression of neuron-related proteins(NeuN,doublecortin,postsynaptic density protein-95,and synaptophysin),anti-apoptosis-related proteins(Bcl-2 and PARP),and an autophagyassociated protein(LC3B),while decreasing the expression of apoptosis-related proteins(BAX and caspase-9),in the hippocampus of amyloid precursor protein/presenilin 1 mice.These observations might be attributable to both the brain-derived neurotrophic factor-mediated signaling pathway and antioxidant pathways.Furthermore,serum metabolomics analysis indicated that multifactor stimulation regulated differentially expressed metabolites associated with cell apoptosis,oxidative damage,and cognition.Collectively,these findings suggest that multifactor stimulation is a novel non-invasive approach for the prevention and treatment of Alzheimer's disease.展开更多
INTRODUCTION Secondary amyloidosis is a rare but seriouscomplication of Crohn’s disease(CD).Theincidence of the association of secondaryamyloidosis in patients with CD has been reportedto be 0.5%-8% in Western countr...INTRODUCTION Secondary amyloidosis is a rare but seriouscomplication of Crohn’s disease(CD).Theincidence of the association of secondaryamyloidosis in patients with CD has been reportedto be 0.5%-8% in Western countries.However,in Japan,the number of patients with CDcomplicated by amyloidosis is limited.Thecharacteristics of their clinical manifestations andthe incidence of association are uncertain.Therefore,we report herein a patient with展开更多
We are reporting a rare case of a patient with primary(AL) amyloidosis presenting with an acute non-varicealupper gastrointestinal hemorrhage in the absence ofother systemic involvement. The case report involves a58-y...We are reporting a rare case of a patient with primary(AL) amyloidosis presenting with an acute non-varicealupper gastrointestinal hemorrhage in the absence ofother systemic involvement. The case report involves a58-year-old woman with significant cardiac history andhereditary blood disorder who came in complaining ofabdominal pain and coffee-ground emesis for two days.Computed tomography(CT) scan of the abdomen andpelvis with contrast revealed segmental wall thickeningof the proximal jejunum with hyperdense, heterog-enous luminal content. Similar findings were evident inthe left lower small bowel region, suspicious for smallbowel hematoma and the possibility of intraluminalclots. Esophagogastroduodenoscopy performed postresuscitation showed punctate, erythematous lesionsthroughout the stomach as well as regions of smallbowel mucosa that appeared scalloped, ulcerated, andhemorrhaged on contact. Despite initial treatment for immunostain-positive focal cytomegalovirus gastritis, follow-up esophagogastroduodenoscopy after two months continued to demonstrate friable and irregular duodenal mucosa hinting at a different underlying etiol-ogy. Pathology reports from analyses of biopsy samples highlighted infiltration and expansion of the lamina pro-pria and submucosa. Subsequent staining with congo red/crystal violet and appropriate subtyping established the diagnosis of AL(kappa)-type amyloidosis. The sig-nificance of this case lies in the fact that our patient did not have the typically seen diagnostic systemic involvements-namely of heart and kidneys-usually seen in primary(AL) amyloidosis patients. It was the persis-tent endoscopic findings and biopsy results which gave clues to the physicians regarding the possibility of an abnormal protein-deposition entity.展开更多
PC12 cell injury was induced using 20 μM amyloid β-protein 25-35 to establish a model of Alzheimer＇s disease. The cells were then treated with 5, 10, and 25 μM Schisandrin B. Methylthiazolyldiphenyl-tetrazolium br...PC12 cell injury was induced using 20 μM amyloid β-protein 25-35 to establish a model of Alzheimer＇s disease. The cells were then treated with 5, 10, and 25 μM Schisandrin B. Methylthiazolyldiphenyl-tetrazolium bromide assays and Hoechst 33342 staining results showed that with increasing Schisandrin B concentration, the survival rate of PC12 cells injured by amyloid β-protein 25-35 gradually increased and the rate of apoptosis gradually decreased. Reverse transcription-PCR, immunocytochemical staining and western blot results showed that with increasing Schisandrin B concentration, the mRNA and protein expression of vacuolar protein sorting 35 and amyloid precursor protein were gradually decreased. Vacuolar protein sorting 35 and amyloid precursor protein showed a consistent trend for change. These findings suggest that 5, 10, and 25 μM Schisandrin B antagonizes the cellular injury induced by amyloid β-protein 25-35 in a dose-dependent manner. This may be caused by decreasing the expression of vacuolar protein sorting 35 and amyloid precursor protein.展开更多
Amyloid β-protein(Aβ) and Tau, two common pathogenic proteins associated with Alzheimer’s disease(AD), cross-interact, and thus co-assemble into hybrid aggregates. However, molecular mechanism of the cross-interact...Amyloid β-protein(Aβ) and Tau, two common pathogenic proteins associated with Alzheimer’s disease(AD), cross-interact, and thus co-assemble into hybrid aggregates. However, molecular mechanism of the cross-interactions remains unclear. To explore the issue, docking and molecular dynamics(MD) simulations were coupled to study the cross-interactions between Aβ pentamer and Tau pentamer. Four stable hybrid decamer conformations including double layer, single layer, block, and part-in were obtained by protein-protein docking software HADDOCK 2.2. Then, MD simulations were used to explore the molecular mechanism of cross-interactions between Aβ pentamer and Tau pentamer. The results of MD simulations showed that the part-in structure was the most stable among all the above four representative ones. The binding energy between Aβ and Tau was about-759.77 kJ·mol-1in the part-in structure. Moreover, the part-in conformation would undergo conformational transition, which would improve its hydrophobicity and make the structure more compact. This work offers a structural understanding of cross-interactions between Aβ and Tau linked to AD.展开更多
基金The study was approved by the Biomedical Research Ethics Committee of West China Hospital,Sichuan University(2014No.37).
文摘BACKGROUND Islet amyloid deposition and reducedβ-cell mass are pathological hallmarks in type 2 diabetes mellitus subjects.To date,the pathological features of the islets in diabetes secondary to pancreatic ductal adenocarcinoma(PDAC)have not been specifically addressed.AIM To provide further insight into the relationship between islet amyloid deposition of the residual pancreas in PDAC patients and to explore whether regional differences(proximal vs distal residual pancreas)are associated with islet amyloid deposition.METHODS We retrospectively collected clinical information and pancreatic tissue removed from tumors of 45 PDAC patients,including 14 patients with normal glucose tolerance(NGT),16 patients with prediabetes and 15 new-onset diabetes(NOD)patients diagnosed before surgery by an oral glucose tolerance test at West China Hospital from July 2017 to June 2020.Pancreatic volume was calculated by multiplying the estimated area of pancreatic tissue on each image slice by the interval between slices based on abdominal computer tomography scans.Several sections of paraffin-embedded pancreas specimens from both the proximal and/or distal regions remote from the tumor were stained as follows:(1)Hematoxylin and eosin for general histological appearance;(2)hematoxylin and insulin for the determination of fractionalβ-cell area(immunohistochemistry);and(3)quadruple insulin,glucagon,thioflavin T and DAPI staining for the determination ofβ-cell area,α-cell area and amyloid deposits.RESULTS Screening for pancreatic histologic features revealed that duct obstruction with islet amyloid deposition,fibrosis and marked acinar atrophy were robust in the distal pancreatic regions but much less robust in the proximal regions,especially in the prediabetes and NOD groups.Consistent with this finding,the remnant pancreatic volume was markedly decreased in the NOD group by nearly one-half compared with that in the NGT group(37.35±12.16 cm^(3) vs 69.79±18.17 cm^(3),P<0.001).As expected,islets that stained positive for amyloid(islet amyloid density)were found in the majority of PDAC cases.The proportion of amyloid/islet area(severity of amyloid deposition)was significantly higher in both prediabetes and NOD patients than in NGT patients(P=0.002;P<0.0001,respectively).We further examined the regional differences in islet amyloid deposits.Islet amyloid deposit density was robustly increased by approximately 8-fold in the distal regions compared with that in the proximal regions in the prediabetes and NOD groups(3.98%±3.39%vs 0.50%±0.72%,P=0.01;12.03%vs 1.51%,P=0.001,respectively).CONCLUSION In conclusion,these findings suggest that robust alterations of the distal pancreas due to tumors can disturb islet function and structure with islet amyloid formation,which may be associated with the pathogenesis of NOD secondary to PDAC.
文摘The familiar amyloid polyneuropathy(FAP) is a rare autosomal-dominant systemic amyloidosis. Amyloid deposition occurs more frequently and extensively in the vitq. The increase in intraocular pressure(IOP) is a result of deposition of transthyretin(TTR) in trabecular meshwork. Rarely, the amyloid deposition in anterior segment can be more exuberant than in posterior segment. A 42 years old man, with FAP(Val30Met mutation), liver transplantation in 1997. He was asymptomatic, without any significant ocular abnormality until 2011. In 2011 he had an episode of pain in right eye(RE). Scalloped pupils, pupillary amyloid deposits and subtle vitreous opacities were detected. The IOP was 40 mmHg in RE and 28 mmHg in left eye(LE) with open angle. Optical coherence tomography detected a temporal superior retinal nerve fiber layer defect in LE and perimetry was normal. Topical timolol was initiated, and brimonidine was subsequently added to improve IOP control, which was achieved with topical medication until last evaluation. No progression occurred since 2011. Actually, with longer life expectancies, there is an increased risk of ocular involvement in FAP, even after liver transplantation. Although rare, a more exuberant amyloid deposition in anterior segment vs posterior segment can occur, and supports an important role of amyloid production in ciliary pigment epithelium in these patients. Medical control of IOP and a stable course are unusual in this secondary glaucoma. Ophthalmologists have an important task in the follow-up of patients and early diagnosis of risk factors for secondary glaucoma, such as scalloped pupils with amyloid deposits.
文摘Primary cutaneous marginal zone B-cell lymphoma (MZL) is considered a cutaneous counterpart of extranodal MZL of mucosa-associated lymphoid tissue and an indolent lymphoma. Amyloid deposition in this tumor is very rare. We report here a case of primary cutaneous MZL with massive amyloid deposition. The tumor disseminated to the dura and mimicked primary dural MZL. The patient had a four year history of the recurrence cutaneous lesions with a misdiagnosis of amyloidosis. The correct diagnosis was made after the metastatic dural lesion was confirmed by radiology, pathology and molecular biology approaches. It is of crucial importance for differential diagnosis to avoid misdiagnosis and the patients are indeed required long-term regular examinations and treatment because of the possibility of recurrence or dissemination.
文摘Aim: The abnormal accumulation, assembly and deposition of the amyloid β-protein (Aβ) are prominent pathological features of patients with Alzheimer’s disease (AD) and related disorders. A number of factors in the brain can influence Aβ accumulation and associated pathologies. The aim of the present study was to determine the consequences of deleting nitric oxide synthase (NOS) 3, the endothelial form of NOS, in Tg-5xFAD mice, a model of parenchymal AD-like amyloid pathology. Methods: Tg-5xFAD mice were bred with NOS3-/- mice. Cohorts of Tg-5xFAD mice and bigenic Tg-5xFAD/NOS3-/- mice were aged to six months followed by collection of the blood and brain tissues from the mice for biochemical and pathological analyses. Results: ELISA analyses show that the absence of NOS3 results in elevated levels of cerebral and plasma Aβ peptides in Tg-5xFAD mice. Immunohistochemical analyses show that the absence of NOS3 increased the amount of parenchymal Aβ deposition and fibrillar amyloid accumulation in Tg-5xFAD mice. The elevated levels of Aβ were not due to changes in the expression levels of transgene encoded human amyloid precursor protein (APP), endogenous β-secretase, or increased proteolytic processing of APP. Conclusions: The results from this study suggest that the loss of NOS3 activity enhances Aβ pathology in Tg-5xFAD mice. These findings are similar to previous studies of NOS2 deletion suggesting that reduced NOS activity and NO levels enhance amyloid-associated pathologies in human APP transgenic mice.
基金supported by the Hefei Comprehensive National Science Center Hefei Brain Project(to KW)the National Natural Science Foundation of China,Nos.31970979(to KW),82101498(to XW)the STI2030-Major Projects,No.2021ZD0201800(to PH).
文摘Alzheimer’s disease is a neurodegenerative disease resulting from deficits in synaptic transmission and homeostasis.The Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neurodegeneration and ultimately disrupting the operational abilities in daily life,leaving patients incapacitated.Repetitive transcranial magnetic stimulation is a cost-effective,neuro-modulatory technique used for multiple neurological conditions.Over the past two decades,it has been widely used to predict cognitive decline;identify pathophysiological markers;promote neuroplasticity;and assess brain excitability,plasticity,and connectivity.It has also been applied to patients with dementia,because it can yield facilitatory effects on cognition and promote brain recovery after a neurological insult.However,its therapeutic effectiveness at the molecular and synaptic levels has not been elucidated because of a limited number of studies.This study aimed to characterize the neurobiological changes following repetitive transcranial magnetic stimulation treatment,evaluate its effects on synaptic plasticity,and identify the associated mechanisms.This review essentially focuses on changes in the pathology,amyloidogenesis,and clearance pathways,given that amyloid deposition is a major hypothesis in the pathogenesis of Alzheimer’s disease.Apoptotic mechanisms associated with repetitive transcranial magnetic stimulation procedures and different pathways mediating gene transcription,which are closely related to the neural regeneration process,are also highlighted.Finally,we discuss the outcomes of animal studies in which neuroplasticity is modulated and assessed at the structural and functional levels by using repetitive transcranial magnetic stimulation,with the aim to highlight future directions for better clinical translations.
基金supported by the National Natural Science Foundation of China,No.82001155(to LL)the Natural Science Foundation of Zhejiang Province,No.LY23H090004(to LL)+5 种基金the Natural Science Foundation of Ningbo,No.2023J068(to LL)the Fundamental Research Funds for the Provincial Universities of Zhejiang Province,No.SJLY2023008(to LL)the College Students'Scientific and Technological Innovation Project(Xin Miao Talent Plan)of Zhejiang Province,No.2022R405A045(to CC)the Student ResearchInnovation Program(SRIP)of Ningbo University,Nos.20235RIP1919(to CZ),2023SRIP1938(to YZ)the K.C.Wong Magna Fund in Ningbo University。
文摘A reduction in adult neurogenesis is associated with behavioral abnormalities in patients with Alzheimer's disease.Consequently,enhancing adult neurogenesis represents a promising therapeutic approach for mitigating disease symptoms and progression.Nonetheless,nonpharmacological interventions aimed at inducing adult neurogenesis are currently limited.Although individual non-pharmacological interventions,such as aerobic exercise,acousto-optic stimulation,and olfactory stimulation,have shown limited capacity to improve neurogenesis and cognitive function in patients with Alzheimer's disease,the therapeutic effect of a strategy that combines these interventions has not been fully explored.In this study,we observed an age-dependent decrease in adult neurogenesis and a concurrent increase in amyloid-beta accumulation in the hippocampus of amyloid precursor protein/presenilin 1 mice aged 2-8 months.Amyloid deposition became evident at 4 months,while neurogenesis declined by 6 months,further deteriorating as the disease progressed.However,following a 4-week multifactor stimulation protocol,which encompassed treadmill running(46 min/d,10 m/min,6 days per week),40 Hz acousto-optic stimulation(1 hour/day,6 days/week),and olfactory stimulation(1 hour/day,6 days/week),we found a significant increase in the number of newborn cells(5'-bromo-2'-deoxyuridine-positive cells),immature neurons(doublecortin-positive cells),newborn immature neurons(5'-bromo-2'-deoxyuridine-positive/doublecortin-positive cells),and newborn astrocytes(5'-bromo-2'-deoxyuridine-positive/glial fibrillary acidic protein-positive cells).Additionally,the amyloid-beta load in the hippocampus decreased.These findings suggest that multifactor stimulation can enhance adult hippocampal neurogenesis and mitigate amyloid-beta neuropathology in amyloid precursor protein/presenilin 1 mice.Furthermore,cognitive abilities were improved,and depressive symptoms were alleviated in amyloid precursor protein/presenilin 1 mice following multifactor stimulation,as evidenced by Morris water maze,novel object recognition,forced swimming test,and tail suspension test results.Notably,the efficacy of multifactor stimulation in consolidating immature neurons persisted for at least 2weeks after treatment cessation.At the molecular level,multifactor stimulation upregulated the expression of neuron-related proteins(NeuN,doublecortin,postsynaptic density protein-95,and synaptophysin),anti-apoptosis-related proteins(Bcl-2 and PARP),and an autophagyassociated protein(LC3B),while decreasing the expression of apoptosis-related proteins(BAX and caspase-9),in the hippocampus of amyloid precursor protein/presenilin 1 mice.These observations might be attributable to both the brain-derived neurotrophic factor-mediated signaling pathway and antioxidant pathways.Furthermore,serum metabolomics analysis indicated that multifactor stimulation regulated differentially expressed metabolites associated with cell apoptosis,oxidative damage,and cognition.Collectively,these findings suggest that multifactor stimulation is a novel non-invasive approach for the prevention and treatment of Alzheimer's disease.
基金Grant-in-Aid 10670518(to Osamu Saitoh)for Scientific Research from the Ministry of Education,Science,Sports,and Culture,Japan
文摘INTRODUCTION Secondary amyloidosis is a rare but seriouscomplication of Crohn’s disease(CD).Theincidence of the association of secondaryamyloidosis in patients with CD has been reportedto be 0.5%-8% in Western countries.However,in Japan,the number of patients with CDcomplicated by amyloidosis is limited.Thecharacteristics of their clinical manifestations andthe incidence of association are uncertain.Therefore,we report herein a patient with
文摘We are reporting a rare case of a patient with primary(AL) amyloidosis presenting with an acute non-varicealupper gastrointestinal hemorrhage in the absence ofother systemic involvement. The case report involves a58-year-old woman with significant cardiac history andhereditary blood disorder who came in complaining ofabdominal pain and coffee-ground emesis for two days.Computed tomography(CT) scan of the abdomen andpelvis with contrast revealed segmental wall thickeningof the proximal jejunum with hyperdense, heterog-enous luminal content. Similar findings were evident inthe left lower small bowel region, suspicious for smallbowel hematoma and the possibility of intraluminalclots. Esophagogastroduodenoscopy performed postresuscitation showed punctate, erythematous lesionsthroughout the stomach as well as regions of smallbowel mucosa that appeared scalloped, ulcerated, andhemorrhaged on contact. Despite initial treatment for immunostain-positive focal cytomegalovirus gastritis, follow-up esophagogastroduodenoscopy after two months continued to demonstrate friable and irregular duodenal mucosa hinting at a different underlying etiol-ogy. Pathology reports from analyses of biopsy samples highlighted infiltration and expansion of the lamina pro-pria and submucosa. Subsequent staining with congo red/crystal violet and appropriate subtyping established the diagnosis of AL(kappa)-type amyloidosis. The sig-nificance of this case lies in the fact that our patient did not have the typically seen diagnostic systemic involvements-namely of heart and kidneys-usually seen in primary(AL) amyloidosis patients. It was the persis-tent endoscopic findings and biopsy results which gave clues to the physicians regarding the possibility of an abnormal protein-deposition entity.
基金supported by the National 985 Project "linguistic science technology and the construction of interdisciplinary innovation platform in current society",No.985yk002the National 985 Project "cognitive and neural information science platform",No.904273258
文摘PC12 cell injury was induced using 20 μM amyloid β-protein 25-35 to establish a model of Alzheimer＇s disease. The cells were then treated with 5, 10, and 25 μM Schisandrin B. Methylthiazolyldiphenyl-tetrazolium bromide assays and Hoechst 33342 staining results showed that with increasing Schisandrin B concentration, the survival rate of PC12 cells injured by amyloid β-protein 25-35 gradually increased and the rate of apoptosis gradually decreased. Reverse transcription-PCR, immunocytochemical staining and western blot results showed that with increasing Schisandrin B concentration, the mRNA and protein expression of vacuolar protein sorting 35 and amyloid precursor protein were gradually decreased. Vacuolar protein sorting 35 and amyloid precursor protein showed a consistent trend for change. These findings suggest that 5, 10, and 25 μM Schisandrin B antagonizes the cellular injury induced by amyloid β-protein 25-35 in a dose-dependent manner. This may be caused by decreasing the expression of vacuolar protein sorting 35 and amyloid precursor protein.
基金funded by the National Natural Science Foundation of China (21908165 and 21878234)Regional Innovation System Project (21ZYQCSY00050)。
文摘Amyloid β-protein(Aβ) and Tau, two common pathogenic proteins associated with Alzheimer’s disease(AD), cross-interact, and thus co-assemble into hybrid aggregates. However, molecular mechanism of the cross-interactions remains unclear. To explore the issue, docking and molecular dynamics(MD) simulations were coupled to study the cross-interactions between Aβ pentamer and Tau pentamer. Four stable hybrid decamer conformations including double layer, single layer, block, and part-in were obtained by protein-protein docking software HADDOCK 2.2. Then, MD simulations were used to explore the molecular mechanism of cross-interactions between Aβ pentamer and Tau pentamer. The results of MD simulations showed that the part-in structure was the most stable among all the above four representative ones. The binding energy between Aβ and Tau was about-759.77 kJ·mol-1in the part-in structure. Moreover, the part-in conformation would undergo conformational transition, which would improve its hydrophobicity and make the structure more compact. This work offers a structural understanding of cross-interactions between Aβ and Tau linked to AD.
