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Nitrate reduction capacity of the oral microbiota is impaired in periodontitis:potential implications for systemic nitric oxide availability

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International Journal of Oral Science 2024年第1期16卷 52-61页

作者： Bob T.Rosier William Johnston Miguel Carda-Diéguez Annabel Simpson Elena Cabello-Yeves Krystyna Piela Robert Reilly Alejandro Artacho Chris Easton Mia Burleigh Shauna Culshaw Alex Mira Department of Genomics and Health FISABIO FoundationCenter for Advanced Research in Public HealthValenciaSpain Department of Biological and Biomedical Sciences Glasgow Caledonian UniversityGlasgowUK Oral Sciences University of Glasgow Dental SchoolSchool of MedicineDentistry and NursingCollege of MedicalVeterinary and Life SciencesUniversity of GlasgowGlasgowUK Sport and Physical Activity Research Institute University of the West of ScotlandBlantyreScotland Instituto de Biomedicina de Valencia Consejo Superior de Investigaciones Científicas(IBV-CSIC)ValenciaSpain CIBER Center for Epidemiology and Public Health MadridSpain

The reduction of nitrate to nitrite by the oral microbiota has been proposed to be important for oral health and results in nitric oxide formation that can improve cardiometabolic conditions. Studies of bacterial composition in subgingival plaque suggest that nitrate-reducing bacteria are associated with periodontal health, but the impact of periodontitis on nitrate-reducing capacity(NRC)and, therefore, nitric oxide availability has not been evaluated. The current study aimed to evaluate how periodontitis affects the NRC of the oral microbiota. First, 16S rRNA sequencing data from five different countries were analyzed, revealing that nitratereducing bacteria were significantly lower in subgingival plaque of periodontitis patients compared with healthy individuals(P impaired NRC in periodontitis could limit dietary nitrate-derived nitric oxide levels, and the effect on systemic health should be explored in future studies.

关键词： impaired intake nitrate

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Protein Arginine Methyltransferase 1 Ablation in Motor Neurons Causes Mitochondrial Dysfunction Leading to Age-related Motor Neuron Degeneration with Muscle Loss

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Research 2024年第1期2023卷 637-649页

作者： Hyun-Kyung So Hyebeen Kim Jinwoo Lee Chang-Lim You Chae-Eun Yun Hyeon-Ju Jeong Eun-Ju Jin Yunju Jo Dongryeol Ryu Gyu-Un Bae Jong-Sun Kang Department of Molecular Cell Biology Sungkyunkwan University School of MedicineSuwonKorea Single Cell Network Research Center Sungkyunkwan University School of MedicineSuwonKorea Research Institute of Aging-Related Diseases AniMusCureInc.SuwonKorea Drug Information Research Institute Muscle Physiome Research CenterCollege of PharmacySookmyung Women’s UniversitySeoulKorea

Neuromuscular dysfunction is tightly associated with muscle wasting that occurs with age or due to degenerative diseases.However,the molecular mechanisms underlying neuromuscular dysfunction are currently unclear.Recent studies have proposed important roles of Protein arginine methyltransferase 1(Prmt1)in muscle stem cell function and muscle maintenance.In the current study,we set out to determine the role of Prmt1 in neuromuscular function by generating mice with motor neuron-specific ablation of Prmt1(mnKO)using Hb9-Cre.mnKO exhibited age-related motor neuron degeneration and neuromuscular dysfunction leading to premature muscle loss and lethality.Prmt1 deficiency also impaired motor function recovery and muscle reinnervation after sciatic nerve injury.The transcriptome analysis of aged mnKO lumbar spinal cords revealed alterations in genes related to inflammation,cell death,oxidative stress,and mitochondria.Consistently,mnKO lumbar spinal cords of sciatic nerve injury model or aged mice exhibited elevated cellular stress response in motor neurons.Furthermore,Prmt1 inhibition in motor neurons elicited mitochondrial dysfunction.Our findings demonstrate that Prmt1 ablation in motor neurons causes agerelated motor neuron degeneration attributing to muscle loss.Thus,Prmt1 is a potential target for the prevention or intervention of sarcopenia and neuromuscular dysfunction related to aging.

关键词： degeneration impaired prevention

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Hepatic Zbtb18 (Zinc Finger and BTB Domain Containing 18) alleviates hepatic steatohepatitis via FXR (Farnesoid X Receptor)

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Signal Transduction and Targeted Therapy 2024年第2期9卷 766-781页

作者： Lei Zhang Jiabing Chen Xiaoying Yang Chuangpeng Shen Jiawen Huang Dong Zhang Naihua Liu Chaonan Liu Yadi Zhong Yingjian Chen Kaijia Tang Jingyi Guo Tianqi Cui Siwei Duan Jiayu Li Shangyi Huang Huafeng Pan Huabing Zhang Xiaoqiang Tang Yongsheng Chang Yong Gao State Key Laboratory of Traditional Chinese Medicine Syndrome Science and Technology Innovation CenterGuangzhou University of Chinese MedicineGuangzhouChina Key Laboratory of Immune Microenvironment and Disease(Ministry of Education) Tianjin Key Laboratory of Cellular Homeostasis and DiseaseDepartment of Physiology and PathophysiologyTianjin Medical UniversityTianjinChina Jiangsu Key Laboratory of Immunity and Metabolism Department of Pathogen Biology and ImmunologyJiangsu International Laboratory of Immunity and MetabolismXuzhou Medical UniversityXuzhouChina Department of Endocrinology The First Clinical CollegeGuangzhou University of Chinese MedicineGuangdongChina The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine ShenzhenChina Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine in Prevention and Treatment of Tumor Nanjing University of Chinese MedicineNanjingChina Department of Biochemistry and Molecular Biology Metabolic Disease Research CenterSchool of Basic MedicineAnhui Medical UniversityHefeiChina Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE State Key Laboratory of BiotherapyWest China Second University HospitalSichuan UniversityChengduChina

A lasting imbalance between fatty acid synthesis and consumption leads to non-alcoholic fatty liver disease(NAFLD),coupled with hepatitis and insulin resistance.Yet the details of the underlying mechanisms are not fully understood.Here,we unraveled that the expression of the transcription factor Zbtb18 is markedly decreased in the livers of both patients and murine models of NAFLD.Hepatic Zbtb18 knockout promoted NAFLD features like impaired energy expenditure and fatty acid oxidation(FAO),and induced insulin resistance.Conversely,hepatic Zbtb18 overexpression alleviated hepato-steatosis,insulin resistance,and hyperglycemia in mice fed on a high-fat diet(HFD)or in diabetic mice.Notably,in vitro and in vivo mechanistic studies revealed that Zbtb18 transcriptional activation of Farnesoid X receptor(FXR)mediated FAO and Clathrin Heavy Chain(CLTC)protein hinders NLRP3 inflammasome activity.This key mechanism by which hepatocyte’s Zbtb18 expression alleviates NAFLD and consequent liver fibrosis was further verified by FXR’s deletion and forced expression in mice and cultured mouse primary hepatocytes(MPHs).Moreover,CLTC deletion significantly abrogated the hepatic Zbtb18 overexpression-driven inhibition of NLRP3 inflammasome activity in macrophages.Altogether,Zbtb18 transcriptionally activates the FXR-mediated FAO and CLTC expression,which inhibits NLRP3 inflammasome’s activity alleviating inflammatory stress and insulin resistance,representing an attractive remedy for hepatic steatosis and fibrosis.

关键词： hepatic Hepatic impaired

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A positive feedback inhibition of isocitrate dehydrogenase 3βon paired-box gene 6 promotes Alzheimer-like pathology

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2324-2340页

作者： Xin Wang Qian Liu Hai-tao Yu Jia-zhao Xie Jun-ning Zhao Zhi-ting Fang Min Qu Yao Zhang Ying Yang Jian-Zhi Wang Department of Pathophysiology School of Basic MedicineKey Laboratory of Education Ministry of China/Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Department of Fundamental Medicine Wuxi School of MedicineJiangnan UniversityWuxiJiangsu 214122China Hubei Provincial Key Laboratory for Applied Toxicology Hubei Provincial Center for Disease Control and PreventionHubei Provincial Academy of Preventive MedicineWuhan 430000China Endocrine Department of Liyuan Hospital Key Laboratory of Ministry of Education of China for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430077China Co-innovation Center of Neuroregeneration Nantong UniversityNantong 226000China

impaired brain glucose metabolism is an early indicator of Alzheimer’s disease(AD);however,the fundamental mechanism is unknown.In this study,we found a substantial decline in isocitrate dehydrogenase 3β(IDH3β)levels,a critical tricarboxylic acid cycle enzyme,in AD patients and AD-transgenic mice’s brains.Further investigations demonstrated that the knockdown of IDH3βinduced oxidation-phosphorylation uncoupling,leading to reduced energy metabolism and lactate accumulation.The resulting increased lactate,a source of lactyl,was found to promote histone lactylation,thereby enhancing the expression of paired-box gene 6(PAX6).As an inhibitory transcription factor of IDH3β,the elevated PAX6 in turn inhibited the expression of IDH3β,leading to tau hyperphosphorylation,synapse impairment,and learning and memory deficits resembling those seen in AD.In AD-transgenic mice,upregulating IDH3βand downregulating PAX6 were found to improve cognitive functioning and reverse AD-like pathologies.Collectively,our data suggest that impaired oxidative phosphorylation accelerates AD progression via a positive feedback inhibition loop of IDH3β-lactate-PAX6-IDH3β.Breaking this loop by upregulating IDH3βor downregulating PAX6 attenuates AD neurodegeneration and cognitive impairments.

关键词： metabolism Alzheimer impaired

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Suppression of ITPKB degradation by Trim25 confers TMZ resistance in glioblastoma through ROS homeostasis

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Signal Transduction and Targeted Therapy 2024年第4期9卷 1637-1650页

作者： Yuanliang Yan Shangjun Zhou Xi Chen Qiaoli Yi Songshan Feng Zijin Zhao Yuanhong Liu Qiuju Liang Zhijie Xu Zhi Li Lunquan Sun Department of Pharmacy Xiangya HospitalCentral South UniversityChangsha 410008China Department of Neurosurgery Xiangya HospitalCentral South UniversityChangsha 410008China Department of Pathology Xiangya HospitalCentral South UniversityChangsha 410008China Xiangya Cancer Center Xiangya HospitalCentral South UniversityChangsha 410008China Key Laboratory of Molecular Radiation Oncology Hunan Province Changsha 410008China institute of Cancer Research National Clinical Research Center for Geriatric Disorders(Xiangya)Xiangya HospitalCentral South UniversityChangsha 410008China

Temozolomide(TMZ)represents a standard-of-care chemotherapeutic agent in glioblastoma(GBM).However,the development of drug resistance constitutes a significant hurdle in the treatment of malignant glioma.Although specific innovative approaches,such as immunotherapy,have shown favorable clinical outcomes,the inherent invasiveness of most gliomas continues to make them challenging to treat.Consequently,there is an urgent need to identify effective therapeutic targets for gliomas to overcome chemoresistance and facilitate drug development.This investigation used mass spectrometry to examine the proteomic profiles of six pairs of GBM patients who underwent standard-of-care treatment and surgery for both primary and recurrent tumors.A total of 648 proteins exhibiting significant differential expression were identified.Gene Set Enrichment Analysis(GSEA)unveiled notable alterations in pathways related to METABOLISM_OF_LIPIDS and BIOLOGICAL_OXIDATIONS between the primary and recurrent groups.Validation through glioma tissue arrays and the Xiangya cohort confirmed substantial upregulation of inositol 1,4,5-triphosphate(IP3)kinase B(ITPKB)in the recurrence group,correlating with poor survival in glioma patients.In TMZ-resistant cells,the depletion of ITPKB led to an increase in reactive oxygen species(ROS)related to NADPH oxidase(NOX)activity and restored cell sensitivity to TMz.Mechanistically,the decreased phosphorylation of the E3 ligase Trim25 at the S100 position in recurrent GBM samples accounted for the weakened ITPKB ubiquitination.This,in turn,elevated ITPKB stability and impaired ROS production.Furthermore,ITPKB depletion or the ITPKB inhibitor GNF362 effectively overcome TMZ chemoresistance in a glioma xenograft mouse model.These findings reveal a novel mechanism underlying TMZ resistance and propose ITPKB as a promising therapeutic target forTMZ-resistant GBM.

关键词： TMZ homeostasis impaired

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Advancing insights into in vivo meningeal lymphatic vessels with stereoscopic wide-field photoacoustic microscopy

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Light(Science & Applications) 2024年第5期13卷 894-907页

作者： Fei Yang Zhiyang Wang Wenbin Shi Miao Wang Rui Ma Wuyu Zhang Xipeng Li Erqi Wang Wenjie Xie Zhan Zhang Qi Shen Feifan Zhou Sihua Yang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science South China Normal UniversityGuangzhou 510631China. Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China. Key Laboratory of Biomedical Engineering of Hainan Province School of Biomedical EngineeringHainan UniversityHaikou 570100China. Department of Neurology Sun Yatsen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China. Guangdong Province Key Laboratory of Brain Function and Disease Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou 510120China. Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter South China Normal UniversityGuangzhou 510006China

Meningeal lymphatic vessels(mLVs)play a pivotal role in regulating metabolic waste from cerebrospinal fluid(CSF).However,the current limitations in field of view and resolution of existing imaging techniques impede understanding the stereoscopic morphology and dynamic behavior of mLVs in vivo.Here,we utilized dual-contrast functional photoacoustic microscopy to achieve wide-field intravital imaging of the lymphatic system,including mLVs and glymphatic pathways.The stereoscopic photoacoustic microscopy based on opto-acoustic confocal features has a depth imaging capability of 3.75 mm,facilitating differentiation between mLVs on the meninges and glymphatic pathways within the brain parenchyma.Subsequently,using this imaging technique,we were able to visualize the dynamic drainage of mLVs and identify a peak drainage period occurring around 20–40 min after injection,along with determining the flow direction from CSF to lymph nodes.Inspiringly,in the Alzheimer’s disease(AD)mouse model,we observed that AD mice exhibit a~70%reduction in drainage volume of mLVs compared to wild-type mice.With the development of AD,there is be continued decline in mLVs drainage volume.This finding clearly demonstrates that the AD mouse model has impaired CSF drainage.Our study opens up a horizon for understanding the brain’s drainage mechanism and dissecting mLVs-associated neurological disorders.

关键词： lymphatic impaired field

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Unresolved Excess Accumulation of Myelin-Derived Cholesterol Contributes to Scar Formation after Spinal Cord Injury

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Research 2024年第1期2023卷 17-32页

作者： Bolin Zheng Yijing He Shuai Yin Xu Zhu Qing Zhao Huiyi Yang Zhaojie wang Rongrong Zhu Liming Cheng Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration Ministry of EducationDepartment of OrthopedicsTongji HospitalSchool of MedicineTongji UniversityShanghai 200092China Frontier Science Center for Stem Cell Research School of Life Science and TechnologyTongji UniversityShanghai 200092China Clinical Center for Brain and Spinal Cord Research Tongji UniversityShanghai 200092China

Spinal cord injury triggers complex pathological cascades,resulting in destructive tissue damage and incomplete tissue repair.Scar formation is generally considered a barrier for regeneration in the central nervous system.However,the intrinsic mechanism of scar formation after spinal cord injury has not been fully elucidated.Here,we report that excess cholesterol accumulates in phagocytes and is inefficiently removed from spinal cord lesions in young adult mice.Interestingly,we observed that excessive cholesterol also accumulates in injured peripheral nerves but is subsequently removed by reverse cholesteroltransport.Meanwhile,preventing reverse cholesterol transport leads to macrophage accumulation and fibrosis in injured peripheral nerves.Furthermore,the neonatal mouse spinal cord lesions are devoid of myelin-derived lipids and can heal without excess cholesterol accumulation.We found that transplantation of myelin into neonatal lesions disrupts healing with excessive cholesterol accumulation,persistent macrophage activation,and fibrosis.Myelin internalization suppresses macrophage apoptosis mediated by CD5L expression,indicating that myelin-derived cholesterol plays a critical role in impaired wound healing.Taken together,our data suggest that the central nervous system lacks an efficient approach for cholesterol clearance,resulting in excessive accumulation of myelin-derived cholesterol,thereby inducing scar formation after injury.

关键词： healing Spinal impaired

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Magnesium promotes vascularization and osseointegration in diabetic states

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International Journal of Oral Science 2024年第1期16卷 122-133页

作者： Linfeng Liu Feiyu Wang Wei Song Danting Zhang Weimin Lin Qi Yin Qian Wang Hanwen Li Quan Yuan Shiwen Zhang State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&West China Hospital of Stomatology Sichuan UniversityChengduChina State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&Department of Oral Implantology West China Hospital of StomatologySichuan UniversityChengduChina

Diabetes has long been considered a risk factor in implant therapy and impaired wound healing in soft and hard oral tissues.Magnesium has been proved to promote bone healing under normal conditions.Here,we elucidate the mechanism by which Mg^(2+)promotes angiogenesis and osseointegration in diabetic status.We generated a diabetic mice model and demonstrated thealveolar bone healing was compromised,with significantly decreased angiogenesis.We then developed Mg-coating implants with hydrothermal synthesis.These implants successfully improved the vascularization and osseointegration in diabetic status.Mechanically,Mg^(2+)promoted the degradation of Kelch-like ECH-associated protein 1 (Keap1) and the nucleation of nuclear factor erythroid 2-related factor 2 (Nrf2) by up-regulating the expression of sestrin 2 (SESN2) in endothelial cells,thus reducing theelevated levels of oxidative stress in mitochondria and relieving endothelial cell dysfunction under hyperglycemia.Altogether,our data suggested that Mg^(2+)promoted angiogenesis and osseointegration in diabetic mice by regulating endothelial mitochondria metabolism.

关键词： healing diabetic impaired

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Active components of Dengzhan Shengmai ameliorate cognitive impairment by facilitating hippocampal long-term potentiation via the NMDA receptor-mediated Ca^(2+)/CaMKII pathway

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Journal of Pharmaceutical Analysis 2024年第3期14卷 435-438页

作者： Congyu Ma Ning Sheng Jun Wu Lulu Wang Jiandong Jiang Haibo Yu Jinlan Zhang State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100050China Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100050China

Abnormal synaptic plasticity causes cognitive deficits.Hippocampal long-term potentiation(LTP)is a critical synaptic plasticity process[1].Rescuing impaired LTP is challenging;hence,novel agents are required for LTP facilitation.Chinese medicine Dengzhan Shengmai(DzSM)has shown notable clinical efficacy against cognitive deficits[2].However,it remains unclear how DzSM modulates cognition.Our previous study[3]revealed the influence of DZSM on glutamatergic and GABAergic synapses following chronic cerebral hypoperfusion(CCH),which motivated us to assess how DzSM affects synaptic functions.

关键词： impaired impairment hence

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Docking protein 6 (DOK6) selectively docks the neurotrophic signaling transduction to restrain peripheral neuropathy

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Signal Transduction and Targeted Therapy 2024年第3期9卷 1147-1164页

作者： Yan Guo Pan Xiang Xiaojiao Sun Wei Liu Jiafeng Zhou Bin Yin Lin Hou Boqin Qiang Huiliang Li Pengcheng Shu Xiaozhong Peng Department of Molecular Biology and Biochemistry Institute of Basic Medical SciencesMedical Primate Research CenterNeuroscience CenterChinese Academy of Medical SciencesSchool of Basic Medicine Peking Union Medical CollegeBeijingChina State Key Laboratory of Common Mechanism Research for Major Diseases Beijing 100005China Wolfson Institute for Biomedical Research University College LondonGower StreetLondon WC1E 6BTUK Chinese Institute for Brain Research Beijing 102206China State Key Laboratory of Respiratory Health and Multimorbidity Beijing 100005China Institute of Laboratory Animal Science Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100021China

The appropriate and specific response of nerve cells to various external cues is essential for the establishment and maintenance of neural circuits,and this process requires the proper recruitment of adaptor molecules to selectively activate downstream pathways.Here,we identified that DOK6,a member of the Dok(downstream of tyrosine kinases)family,is required for the maintenance of peripheral axons,and that loss of Dok6 can cause typical peripheral neuropathy symptoms in mice,manifested as impaired sensory,abnormal posture,paw deformities,blocked nerve conduction,and dysmyelination.Furthermore,Dok6 is highly expressed in peripheral neurons but not in Schwann cells,and genetic deletion of Dok6 in peripheral neurons led to typical peripheral myelin outfolding,axon destruction,and hindered retrograde axonal transport.Specifically,DOK6 acts as an adaptor protein for selectivitymediated neurotrophic signal transduction and retrograde transport for TrkC and Ret but not for TrkA and TrkB.DOK6 interacts with certain proteins in the trafficking machinery and controls their phosphorylation,including MAP1B,Tau and Dynein for axonal transport,and specifically activates the downstream ERK1/2 kinase pathway to maintain axonal survival and homeostasis.This finding provides new clues to potential insights into the pathogenesis and treatment of hereditary peripheral neuropathies and other degenerative diseases.

关键词： impaired restrain peripheral

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