Keiko Taguchi

Ehime University, Matuyama, Ehime, Japan

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Publications (10)21.57 Total impact

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    ABSTRACT: A 69-year-old woman was admitted because of unconsciousness and multiple cranial neuropathy. She had suffered diarrhea 2 weeks previously. On examination, she was noted to have total external and internal ophthalmoplegia, bilateral facial palsy, dysphagia, dysarthria, neck weakness, distal motor weakness of all limbs, and ataxia. She had also presented with hyporeflexia and hypoesthesia, but with a bilateral pyramidal tract sign. A study of her cerebrospinal fluid revealed albuminocytologic dissociation, and nerve conduction study revealed demyelination of her peripheral nerves. Moreover, electroencephalography findings were abnormal and anti-GQ1b antibody was positive. We diagnosed Fisher syndrome with Guillain-Barré syndrome and Bickerstaff brainstem encephalitis. We administered intravenous immunoglobulin treatment for 5 days and her symptoms gradually improved. However, her external ophthalmoplegia continued for several months.
    Nippon Ronen Igakkai Zasshi Japanese Journal of Geriatrics 01/2012; 49(3):367-71.
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    ABSTRACT: A 72-year-old woman was admitted to a local hospital with general fatigue, ptosis and dysarthria. Her anti-AchR antibody titer was high, so myasthenia gravis was diagnosed. She was given a cholinesterase inhibitor, but her symptoms did not improve. CT and MRI scans revealed a mass in the anterior mediastinum infiltrating the superior vena cava (SVC) and the right atrium (RA) . The diagnosis was an invasive thymoma extending into the SVC and the RA. Moreover, there was a mass in the right middle lobe of her lung, which was suspected to be the result of metastasis of the thymoma. She was transferred to our hospital for medication and surgery for the invasive thymoma. Urgent surgery was performed without preoperative therapy, because the tumor was nearly obstructing her tricuspid valve. An expanded thymomectomy and a right middle lobectomy were performed. As the tumor had infiltrated into the SVC, the SVC was replaced with an artificial graft. The clinicopathological diagnosis of thymoma (Masaoka Stage IVb) was given. The patient had a myasthenic crisis for several weeks after surgery, so her breathing was controlled by an artificial respirator. Her symptoms improved after treatment with steroids, tacrolimus and a cholinesterase inhibitor. Although major surgery was required to prevent tumor embolism, the patient survived. Careful observation is necessary to detect signs of relapse of invasive thymoma.
    Nippon Ronen Igakkai Zasshi Japanese Journal of Geriatrics 01/2010; 47(2):158-61.
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    ABSTRACT: Mobility impairment in older adults has been suggested to be a marker of subclinical structural and functional brain abnormalities. We investigated a possible association between static postural instability and brain abnormalities and cognitive decline. The study subjects were 390 community residents without definitive dementia (67 +/- 7 years old) and 21 patients with Alzheimer's disease (AD). Brain atrophy was measured by MRI. The mobility of the posturography-measured center of gravity (COG) was positively associated with the temporal horn area (THA; r = 0.260; p < 0.001). Subjects who could not stand on one leg for >40 s (n = 102) showed a significantly larger THA (22 +/- 18 vs. 14 +/- 11 x 10(-2) cm(2); p < 0.001). Multiple regression analysis identified COG path length (beta = 0.118; p = 0.032) and one-leg standing time (beta = 0.176; p = 0.001) as independent determinants of THA. Mild cognitive impairment (MCI) subjects (n = 61) had a significantly enlarged THA compared to that of normal cognitive subjects (22 +/- 16 vs. 16 +/- 13 x 10(-2) cm(2); p = 0.002). AD patients showed a more enlarged THA (78 +/- 55 x 10(-2) cm(2)). Subjects with cognitive decline showed a significantly shorter one-leg standing time (normal: 50 +/- 17 s; MCI: 42 +/- 21 s; AD: 18 +/- 20s; p < 0.001). Reduced postural stability was an independent marker of brain atrophy and pathological cognitive decline in the elderly.
    Dementia and Geriatric Cognitive Disorders 01/2010; 29(5):379-87. · 2.79 Impact Factor
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    ABSTRACT: Mild cognitive impairment (MCI), a syndrome characteristic of the transition phase between normal cognitive function and dementia, has been shown to carry the risk of progression to dementia. Dysregulation of blood pressure (BP) is thought to be an indicator of cerebrovascular damage, including cognitive impairment. Here, we investigated the possible association of circadian BP variation with MCI in community-dwelling persons exhibiting no definitive dementia. Our study enrolled 144 persons (68+/-7 years). Nocturnal BP profile was defined as dipper, with a 10-19% drop in nocturnal systolic BP; extreme dipper, >or=20% drop; non-dipper, 0-10% drop; and riser, any increase in nocturnal BP. MCI was assessed using the MCI screen, a cross-validated, staff-administered battery of tests. Subjects with MCI (n=38) were significantly older (74+/-6, 67+/-6 years, P<0.001) and had higher frequency of apolipoprotein E varepsilon4 allele (36.8, 18.9%, P=0.018). Although the ambulatory measured BP and the percent changes in nocturnal systolic BP (-10+/-12% and -12+/-8%, respectively; P=0.291) did not differ between MCI subjects and normal controls, frequency of MCI was significantly higher in the extreme dippers (32.0%), non-dippers (30.0%) and risers (50.0%) than in dippers (13.2%, P=0.018). Multiple logistic regression analysis identified a blunted nocturnal BP decline, non-dipping or increase in nocturnal BP and extreme drop in BP as potent determinants of MCI (odds ratio 3.062, P=0.039), after adjustment for possible confounding factors, including apolipoprotein E varepsilon4 genotype. Abnormal nocturnal BP profile was found to be a strong indicator of MCI in otherwise apparently healthy community-dwelling elderly persons.
    Hypertension Research 10/2009; 33(1):32-6. · 2.79 Impact Factor
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    ABSTRACT: Nicastrin interacts with gamma-secretase complex components predominantly via the N-terminal third of the transmembrane domain. The authentic transmembrane domain is critically required for the interaction with gamma-secretase complex components and for formation of an active gamma-secretase complex. In this study, we have identified a novel alternatively spliced transcript of nicastrin in human brain tissue. This transcript (NCSTN-DeltaE16) lacks exon 16 of nicastrin mRNA, which leads to deletion of 71 amino acids just upstream of its transmembrane domain. Its expression pattern was analyzed in the hippocampus of patients with pathologically diagnosed Alzheimer disease (cases) and non-Alzheimer dementia (controls). In patients with the APOE-epsilon4 allele, the frequency of Alzheimer disease appeared to be increased in the NCSTN-DeltaE16-positive group, but the association was not statistically significant. In conclusion, the expression of NCSTN-DeltaE16 transcript may confer some additional risk for developing Alzheimer disease beyond the risk due to ApoE-epsilon4 allele. Further investigation in larger scale population would be necessary to address its potential implication in Alzheimer disease.
    Life Sciences 05/2006; 78(21):2444-8. · 2.56 Impact Factor
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    ABSTRACT: Lymphocyte-specific protein tyrosine kinase (LCK) is a lymphoid-specific, Src family protein tyrosine kinase that is known to play a pivotal role in T-cell activation and interact with the T-cell coreceptors, CD4 and CD8. It has been shown to be significantly down-regulated in Alzheimer disease (AD) hippocampus compared with non-demented controls. Furthermore, it is located in a previously identified genetic linkage region (1p34-36) associated with AD. Therefore, we consider it to be a candidate gene for AD. We examined the relationship between AD and the LCK and apolipoprotein E (APOE) genes in 376 AD (including 323 late-onset AD (LOAD) cases and 53 early-onset AD (EOAD) cases) and 378 non-demented controls using a single nucleotide polymorphism (SNP). The polymorphism in intron 1 (+6424 A/G) was significantly associated with AD risk. The odds ratio (OR) for total AD associated with the GG genotype was 1.41 (95% CI=1.06-1.87) and that for LOAD was 1.37 (95%CI=1.02-1.85), while that for APOE-epsilon4 was 5.06 (95% CI=3.60-7.12). In the APOE-epsilon4 non-carrier subgroup, the GG genotype also showed significant association (OR=1.66; 95% CI=1.16-2.38). These results indicate that the LCK is a novel risk gene for AD regardless of the APOE genotype.
    Journal of the Neurological Sciences 12/2005; 238(1-2):53-7. · 2.24 Impact Factor
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    ABSTRACT: Alzheimer's disease (AD) is a complex multifactorial disease in which many genetic and environmental factors are involved. We performed an association study using 376 AD patients and 376 control subjects. We studied 35 single nucleotide polymorphisms in 35 genes that were significantly downregulated or upregulated only in the AD hippocampus compared with control and found that 9 single nucleotide polymorphisms were associated with AD. Our data indicated that single nucleotide polymorphisms could highly reflect differences in gene expression. Furthermore, an intronic polymorphism (+9943T/C) in POU2F1 was most significantly associated with AD (p = 0.0007). Our results suggest that POU2F1 is a candidate gene for AD.
    Annals of Neurology 05/2005; 57(4):585-8. · 11.19 Impact Factor
  • Keiko Taguchi, Tetsuro Miki
    Nippon rinsho. Japanese journal of clinical medicine 05/2004; 62 Suppl 4:102-6.
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    ABSTRACT: Early onset familial Alzheimer disease (FAD) has been associated with mutations in three genes, of which presenilin 1 (PSEN1) mutations are the most frequent. We reported previously a variant form of FAD, due to deletion of exon 9 of PSEN1, with spastic paralysis and rigidity. We describe a novel PSEN1 mutation in a family of Japanese origin with six affected individuals of both genders in two generations. The disease is characterized by presenile dementia, which is preceded by spastic paraparesis and apraxia. This mutation, which is predicted to cause a missense substitution of serine for glycine, occurred at codon 266 in exon 8 of PSEN1. The mutation was not found in 200 controls and 200 sporadic AD patients. On this basis alone, it seems this mutation is pathogenic. Our findings provide a new clue to the etiology of the familial early onset dementia.
    American Journal of Medical Genetics 05/2002; 114(3):292-8.
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    ABSTRACT: A 91-year-old man was admitted with colliquative diarrhea, anorexia and weight loss. He had a history of healed tuberculosis, hypertension and atherosclerotic abdominal aortic aneurysms. On admission, shortness of breath without cough, exertional dyspnea, and ascites were also noticed. His chest X-ray and CT showed almost normal findings in the lung fields except for calcified old pleurisy. Since laboratory tests revealed thrombocytopenia, low fibrinogen, and increased CA19-9. DIC induced by an unknown cancer was diagnosed. He died on the eighth day due to progressive respiratory failure which did not respond to oxygen therapy. Autopsy revealed that he had a poorly differentiated adenocarcinoma in the cecum complicated with pulmonary lymphangitis carcinomatosa. Lymphangitis should be considered in the case of unexplained progressive respiratory failure developing in patient with cancer, even in the absence of X-ray findings.
    Nippon Ronen Igakkai Zasshi Japanese Journal of Geriatrics 08/2000; 37(7):561-4.