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Nam DW, Park MH, Jeong SJ, Lee KL, Kim JW, Jeong JB. Sex differences in associated factors for age-related hearing loss. PLoS One 2024; 19:e0298048. [PMID: 38446784 PMCID: PMC10917258 DOI: 10.1371/journal.pone.0298048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 01/17/2024] [Indexed: 03/08/2024] Open
Abstract
The prevalence and age of onset of hearing loss differ according to sex. This study aimed to identify associated factors for age-related hearing loss (ARHL) and determine whether there are differences between males and females regarding associated factors for ARHL. This cross-sectional study used data from adults who underwent medical examinations including hearing tests from 2011 to 2021. A total of 2,349 individuals were included. The study conducted sex-specific analyses using both univariate and multiple regression. Univariate analysis employed logistic regression, while multiple regression involved variable selection through the augmented backward elimination method. Separate multiple logistic regression analyses were conducted for each sex. In the univariate analysis, among males, age, underweight, alcohol consumption, weight, and height exhibited statistical significance. Among females, age, hypertension, diabetes, dyslipidemia, obesity, sarcopenia, weight, height, age at menarche, and duration of hormone exposure were found to be significant factors. However, in the multiple logistic regression model for males, underweight, and smoking emerged as significant, while in females, age, weight, obesity, and age at menarche retained their significance. We found that there are different associated factors for ARHL in each sex. Assessment and counseling for smoking, obstetric history, underweight, and obesity may be beneficial in managing patients with ARHL.
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Affiliation(s)
- Dong Woo Nam
- Department of Otorhinolaryngology, Chungbuk National University Hospital, Cheongju, Republic of Korea
| | - Min-Hyun Park
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
| | - Su Ji Jeong
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
| | - Kook Lae Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Internal Medicine, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
| | - Ji Won Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Internal Medicine, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
| | - Ji Bong Jeong
- Department of Internal Medicine, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
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Nam DW, Song YK, Kim JH, Lee EK, Park KH, Cha J, Choi BY, Lee JH, Oh SH, Jo DH, Lee SY. Allelic hierarchy for USH2A influences auditory and visual phenotypes in South Korean patients. Sci Rep 2023; 13:20239. [PMID: 37981655 PMCID: PMC10658080 DOI: 10.1038/s41598-023-47166-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 11/09/2023] [Indexed: 11/21/2023] Open
Abstract
When medical genetic syndromes are influenced by allelic hierarchies, mutant alleles have distinct effects on clinical phenotypes. Genotype-phenotype correlations for Usher syndrome type 2 (USH2) suggest that the USH2A gene exhibits an allelic hierarchy. Here, we analyzed the phenotypes and genotypes of 16 South Korean patients with USH2A biallelic variants to investigate an allelic hierarchy from audiological and ophthalmological perspectives. Using whole exome and genome sequencing, 18 mutant alleles, including 4 novel alleles, were identified and implicated in USH2A-related disorders. Truncated alleles were linked to earlier onset of subjective hearing loss and more severe thresholds; biallelic truncated alleles had more severe effects. Truncated alleles were also associated with retinal structure degeneration and severe functional deterioration. However, younger patients (aged < 16 years) did not exhibit overt retinitis pigmentosa even when they had biallelic truncated alleles, suggesting that USH2A-related USH2 can mimic nonsyndromic hearing loss. For truncated alleles, there was a clear correlation between mean hearing threshold and 30-Hz flicker electroretinography implicit time. This study provides the first evidence of an USH2A-related allelic hierarchy among South Korean patients; our data yield valuable insights concerning the natural courses of clinical phenotypes and how genotype-based therapies may be used.
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Affiliation(s)
- Dong Woo Nam
- Department of Otorhinolaryngology, Chungbuk National University Hospital, Cheongju, Republic of Korea
| | - Yong Keun Song
- Department of Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jeong Hun Kim
- Fight Against Angiogenesis-Related Blindness (FARB) Laboratory, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
- Department of Ophthalmology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Eun Kyoung Lee
- Department of Ophthalmology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Kyu Hyung Park
- Department of Ophthalmology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - JuHyuen Cha
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Jun Ho Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Seung Ha Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Dong Hyun Jo
- Department of Anatomy and Cell Biology, Seoul National University College of Medicine, 103, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.
| | - Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.
- Department of Genomic Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
- Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Republic of Korea.
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Nam DW, Kang DW, Lee SM, Park MK, Lee JH, Oh SH, Suh MW, Lee SY. Molecular Genetic Etiology and Revisiting the Middle Ear Surgery Outcomes of Branchio-Oto-Renal Syndrome: Experience in a Tertiary Referral Center. Otol Neurotol 2023; 44:e319-e327. [PMID: 37167448 DOI: 10.1097/mao.0000000000003880] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
OBJECTIVES To explore the phenotypes and genotypes of patients with branchio-oto-renal (BOR) and branchio-otic (BO) syndrome, and to analyze the middle ear surgery outcomes qualitatively and quantitatively, proposing a factor usefully prognostic of surgical outcomes. STUDY DESIGN Retrospective cohort study. SETTING Tertiary referral center. PATIENTS Eighteen patients with BOR/BO syndrome in 12 unrelated Korean families. INTERVENTION Middle ear surgery, including either stapes surgery or ossicular reconstruction. MAIN OUTCOME MEASURE Clinical phenotypes, genotypes, and middle ear surgery outcomes. RESULTS Eight probands (66.7%) were confirmed genetically; the condition segregated as a dominant or de novo trait. Six EYA1 heterozygous variants were identified by exome sequencing and multiplex ligation-dependent probe amplification. All variants were pathogenic or likely pathogenic based on the ACMG/AMP guidelines. Two novel EYA1 frameshift variants (p.His373Phefs*4 and p.Gln543Asnfs*90) truncating a highly conserved C-terminal Eya domain were identified, expanding the genotypic spectrum of EYA1 in BOR/BO syndrome. Remarkably, middle ear surgery was individualized to ensure optimal audiological outcomes and afforded significant audiological improvements, especially in BOR/BO patients without enlarged vestibular aqueducts (EVAs). A significant difference in air-bone gap closure after middle ear surgery was noted between the two groups even after adjusting for confounders: -20.5 dB in ears without EVAs (improvement) but 0.8 dB in ears with EVAs (no change or deterioration). Furthermore, the success rate was significantly associated with the absence of EVA. CONCLUSIONS The results of this study were against the notion that middle ear surgery is always contraindicated in patients with BOR/BO syndrome, and an EVA could be a negative prognostic indicator of middle ear surgery in BOR/BO patients. This may aid to determine the strategy of audiological rehabilitation in patients with BOR/BO syndrome.
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Affiliation(s)
- Dong Woo Nam
- Department of Otorhinolaryngology, Chungbuk National University Hospital, Cheongju, Republic of Korea
| | - Dae Woong Kang
- Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - So Min Lee
- Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Moo Kyun Park
- Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jun Ho Lee
- Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung Ha Oh
- Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
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Hwang JH, Lee KH, Nam DW, Song HS. Acupuncture to treat asymptomatic hyperuricemia: A protocol for systematic review and meta-analysis of randomized controlled trials. Medicine (Baltimore) 2021; 100:e24719. [PMID: 33578616 PMCID: PMC10545084 DOI: 10.1097/md.0000000000024719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 01/21/2021] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Hyperuricemia (HUA) plays an important role in metabolic syndrome, cardiovascular disease, and kidney disease. HUA without resulting gout is referred to as asymptomatic HUA. The purpose of the present systematic review protocol is to provide methods to assess the effectiveness and safety of acupuncture-based treatment for asymptomatic HUA. METHODS To identify randomized controlled trials (RCTs) involving acupuncture-based treatment for asymptomatic HUA, a search will be carried out using the following eight electronic databases: MEDLINE, EMBASE, Cochrane Library, Korea Med, Oriental Medicine Advanced Searching Integrated System, Korean Studies Information Service System, China National Knowledge Infrastructure, and Japanese Institutional Repositories Online. Manual search and email contact with the author will also be conducted if necessary. Studies will be selected based on predefined criteria and summarized data regarding study participants, interventions, control groups, outcome measures, side effects, and risk of bias. No language restrictions will be imposed. Studies that evaluated any type of acupuncture will be eligible for inclusion, and the primary outcome will be the blood uric acid level. The methodological quality of the included RCTs will be assessed using the Cochrane risk of bias tool. RESULTS The present study will evaluate the efficacy and safety of acupuncture to treat HUA. CONCLUSION Our findings will establish the evidence for acupuncture-based treatment of HUA and will be informative for patients with HUA, clinicians, policy makers, and researchers. REGISTRATION NUMBER reviewregistry1054.
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Affiliation(s)
- Ji Hye Hwang
- Department of Acupuncture & Moxibustion Medicine, College of Korean Medicine, Gachon University, Seongnam, Republic of Korea
| | - Kwang Ho Lee
- Department of Acupuncture & Moxibustion Medicine, College of Korean Medicine, Sangji University
| | - Dong Woo Nam
- Department of Acupuncture & Moxibustion Medicine, College of Korean Medicine, Kyung Hee University
| | - Ho Sueb Song
- Department of Acupuncture & Moxibustion Medicine, College of Korean Medicine, Gachon University, Seongnam, Republic of Korea
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Park MK, Nam DW, Byun JY, Hong SM, Bae CH, Lee HY, Jeon EJ, Kim MG, Kim SH, Yeo SG. Differences in Antibiotic Resistance of MRSA Infections in Patients with Various Types of Otitis Media. J Int Adv Otol 2019; 14:459-463. [PMID: 30541732 DOI: 10.5152/iao.2018.5374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES We investigated the epidemiological and antibiotic resistance differences in methicillin-resistant Staphylococcus aureus (MRSA) infections in patients with otitis media with effusion (OME), acute otitis media (AOM), chronic suppurative otitis media (CSOM), and chronic cholesteatomatous otitis media (CCOM). MATERIALS AND METHODS We conducted a retrospective study of patients with newly identified MRSA infections from January 2009 through January 2017. Overall, 3,522 patients from 10 tertiary referral hospitals were included in the study. An antibiotic sensitivity test was performed for each isolate. RESULTS MRSA infections in patients with CSOM and CCOM were more resistant to ciprofloxacin, clindamycin, erythromycin, gentamicin, levofloxacin, and tetracycline. Patients showed good susceptibility to rifampicin, trimethoprim/sulfamethoxazole (TMP/SMX), and vancomycin. CONCLUSION MRSA infections in various otitis media cases showed different resistance patterns. MRSA infections in patients with COM and CCOM were more resistant to antibiotics than those in patients with OME and AOM.
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Affiliation(s)
- Moo Kyun Park
- Department of Otorhinolaryngology, Head and Neck Surgery, Seoul National University School of Medicine, Seoul, Korea
| | - Dong Woo Nam
- Department of Otorhinolaryngology, Head and Neck Surgery, Seoul National University School of Medicine, Seoul, Korea
| | - Jae Yong Byun
- Department of Otorhinolaryngology, Head and Neck Surgery, Kyung Hee University, Seoul, Korea
| | - Seok Min Hong
- Department of Otorhinolaryngology, Head and Neck Surgery, Hallym University School of Medicine, Seoul, Korea
| | - Chang Hoon Bae
- Department of Otorhinolaryngology, Head and Neck Surgery, Yeungnam University School of Medicine, Daegu, Korea
| | - Ho Yun Lee
- Department of Otorhinolaryngology, Head and Neck Surgery, Eulji University School of Medicine, Daejon, Korea
| | - Eun-Ju Jeon
- Department of Otorhinolaryngology, Head and Neck Surgery, The Catholic University School of Medicine, Incheon, Korea
| | - Myung Gu Kim
- Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - Sang Hoon Kim
- Department of Otorhinolaryngology, Head and Neck Surgery, Kyung Hee University, Seoul, Korea
| | - Seung Geun Yeo
- Department of Otorhinolaryngology, Head and Neck Surgery, Kyung Hee University, Seoul, Korea
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Lee SY, Nam DW, Kim YH, Park JW. In response to letter to the editor regarding: Clinical implications of magnetic resonance imaging in temporomandibular disorders patients presenting ear fullness. Laryngoscope 2019; 129:E159. [PMID: 30690732 DOI: 10.1002/lary.27732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 11/08/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Sang Yeon Lee
- Department of Otorhinolaryngology, Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Dong Woo Nam
- Department of Otorhinolaryngology, Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Young Ho Kim
- Department of Otorhinolaryngology, Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Ji Woon Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
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Lee SY, Park JW, Park SE, Nam DW, Lim HJ, Kim YH. Clinical implications of magnetic resonance imaging in temporomandibular disorders patients presenting ear fullness. Laryngoscope 2017; 128:1692-1698. [PMID: 29238986 DOI: 10.1002/lary.27043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Revised: 10/31/2017] [Accepted: 11/10/2017] [Indexed: 11/06/2022]
Abstract
OBJECTIVES/HYPOTHESIS The aim of this study was to investigate whether findings detected by temporomandibular joint magnetic resonance imaging (TMJ-MRI) can provide pathognomonic evidence of temporomandibular disorders (TMD) in patients with nonspecific ear fullness (EF). The association of nonspecific EF with clinical characteristics of TMD based on TMJ-MRI findings was examined. STUDY DESIGN Retrospective analysis. METHODS Thirty-four subjects (42 ears) who had no detectable otologic problems as a cause of EF were enrolled in this study. Each subject underwent TMJ-MRI to identify pathology of the TMJ as a possible cause of nonspecific EF. All subjects participated in the re-evaluation process following TMD treatment. RESULTS Anatomical abnormalities in TMJ-MRI, irrespective of TMD signs, were observed in 34 of the 42 ears (80.9%), such as degenerative change of the TMJ (16 ears), articular disc displacement (11 ears), and joint effusion (seven ears). Specific abnormalities of the TMJ were associated with nonspecific EF, and this symptom showed improvement following individualized TMD treatment in those with internal derangement and/or effusion of the TMJ. However, abnormal TMJ-MRI findings were also observed in seven of nine ears with no TMD signs, and there was no significant association between the presence of TMD signs and abnormal TMJ-MRI findings (χ2 = 0.075, P = .784). CONCLUSIONS Patients presenting with nonspecific EF may have TMD, which can be effectively diagnosed using TMJ-MRI. The present study revealed the causal relationship between nonspecific EF and abnormal TMJ findings based on MRI. Individualized TMD treatments based on TMJ-MRI led to improved treatment outcomes with special regard to nonspecific EF LEVEL OF EVIDENCE: 4. Laryngoscope, 128:1692-1698, 2018.
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Affiliation(s)
- Sang Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Ji Woon Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | - Seo Eun Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | - Dong Woo Nam
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Hyun Jung Lim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Young Ho Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul Metropolitan Government, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
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Kim MS, Kim BH, Han YE, Nam DW, Hah JH. Clinical outcomes after local anesthesia with monitored anesthesia care during thyroidectomy and selective neck dissection: a randomized study. Eur Arch Otorhinolaryngol 2017; 274:3789-3794. [DOI: 10.1007/s00405-017-4707-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 08/08/2017] [Indexed: 10/19/2022]
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Tran PT, Hoang VH, Thorat SA, Kim SE, Ann J, Chang YJ, Nam DW, Song H, Mook-Jung I, Lee J, Lee J. Structure–activity relationship of human glutaminyl cyclase inhibitors having an N-(5-methyl-1H-imidazol-1-yl)propyl thiourea template. Bioorg Med Chem 2013; 21:3821-30. [DOI: 10.1016/j.bmc.2013.04.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 04/06/2013] [Accepted: 04/08/2013] [Indexed: 12/31/2022]
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Moon M, Hong HS, Nam DW, Baik SH, Song H, Kook SY, Kim YS, Lee J, Mook-Jung I. Intracellular amyloid-β accumulation in calcium-binding protein-deficient neurons leads to amyloid-β plaque formation in animal model of Alzheimer's disease. J Alzheimers Dis 2012; 29:615-28. [PMID: 22269161 DOI: 10.3233/jad-2011-111778] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
One of the major hallmarks of Alzheimer's disease (AD) is the extracellular deposition of amyloid-β (Aβ) as senile plaques in specific brain regions. Clearly, an understanding of the cellular processes underlying Aβ deposition is a crucial issue in the field of AD research. Recent studies have found that accumulation of intraneuronal Aβ (iAβ) is associated with synaptic deficits, neuronal death, and cognitive dysfunction in AD patients. In this study, we found that Aβ deposits had several shapes and sizes, and that iAβ occurred before the formation of extracellular amyloid plaques in the subiculum of 5XFAD mice, an animal model of AD. We also observed pyroglutamate-modified Aβ (N3pE-Aβ), which has been suggested to be a seeding molecule for senile plaques, inside the Aβ plaques only after iAβ accumulation, which argues against its seeding role. In addition, we found that iAβ accumulates in calcium-binding protein (CBP)-free neurons, induces neuronal death, and then develops into senile plaques in 2-4-month-old 5XFAD mice. These findings suggest that N3pE-Aβ-independent accumulation of Aβ in CBP-free neurons might be an early process that triggers neuronal damage and senile plaque formation in AD patients. Our results provide new insights into several long-standing gaps in AD research, namely how Aβ plaques are formed, what happens to iAβ and how Aβ causes selective neuronal loss in AD patients.
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Affiliation(s)
- Minho Moon
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
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Moon M, Choi JG, Nam DW, Hong HS, Choi YJ, Oh MS, Mook-Jung I. Ghrelin Ameliorates Cognitive Dysfunction and Neurodegeneration in Intrahippocampal Amyloid-β1-42 Oligomer-Injected Mice. ACTA ACUST UNITED AC 2011; 23:147-59. [DOI: 10.3233/jad-2010-101263] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Minho Moon
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Jin Gyu Choi
- Department of Oriental Pharmaceutical Science, College of Pharmacy and Kyung Hee East-West Pharmaceutical Research Institute, Kyung Hee University, Seoul, Korea
| | - Dong Woo Nam
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
- Interdisciplinary Graduate Program of Genetic Engineering, Seoul National University, Seoul, Korea
| | - Hyun-Seok Hong
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Young-Ju Choi
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Myung Sook Oh
- Department of Oriental Pharmaceutical Science, College of Pharmacy and Kyung Hee East-West Pharmaceutical Research Institute, Kyung Hee University, Seoul, Korea
| | - Inhee Mook-Jung
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
- Interdisciplinary Graduate Program of Genetic Engineering, Seoul National University, Seoul, Korea
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Balakrishnan A, Sanders S, Demars S, Webjörn J, Nam DW, Lang RJ, Mehuys DG, Waarts RG, Welch DF. Broadly tunable laser-diode-based mid-infrared source with up to 31 microW of power at 4.3-microm wavelength. Opt Lett 1996; 21:952-954. [PMID: 19876215 DOI: 10.1364/ol.21.000952] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
High-power single-spatial-mode near-IR laser diodes are mixed in periodically poled LiNbO(3) (PPLN) to generate broadly tunable mid IR-radiation. Conversion efficiencies to the mid IR up to 0.017%/W are demonstrated, and up to 31 microW of power is generated at the spectroscopically important 4.3-microm wavelength. We achieved broadband mid-IR tunability by mixing a wavelength-tunable laser-diode pump source with a fixed-wavelength master oscillator power amplifier laser-diode signal source in a PPLN sample that has a poling period that varies from 21.0 to 22.6 microm in the direction transverse to the beam propagation. We generated mid-IR radiation from 4.1 to 4.3 microm with these laser sources, using a fixed 22.0-microm period region of the sample.
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Liau ZL, Nam DW, Waarts RG. Tolerances in microlens fabrication by multilevel etching and mass-transport smoothing. Appl Opt 1994; 33:7371-7376. [PMID: 20941297 DOI: 10.1364/ao.33.007371] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A method is developed for the quantitative assessment of microlens deficiencies caused by inaccuracies in the multistep mesa fabrication or by incomplete mass-transport smoothing. Analytical expressions are obtained and tolerable imperfections are deduced for the practical effort-saving fabrication of highperformance micro-optical elements.
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