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Effects of empagliflozin on progression of chronic kidney disease: a prespecified secondary analysis from the empa-kidney trial. Lancet Diabetes Endocrinol 2024; 12:39-50. [PMID: 38061371 PMCID: PMC7615591 DOI: 10.1016/s2213-8587(23)00321-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 12/23/2023]
Abstract
BACKGROUND Sodium-glucose co-transporter-2 (SGLT2) inhibitors reduce progression of chronic kidney disease and the risk of cardiovascular morbidity and mortality in a wide range of patients. However, their effects on kidney disease progression in some patients with chronic kidney disease are unclear because few clinical kidney outcomes occurred among such patients in the completed trials. In particular, some guidelines stratify their level of recommendation about who should be treated with SGLT2 inhibitors based on diabetes status and albuminuria. We aimed to assess the effects of empagliflozin on progression of chronic kidney disease both overall and among specific types of participants in the EMPA-KIDNEY trial. METHODS EMPA-KIDNEY, a randomised, controlled, phase 3 trial, was conducted at 241 centres in eight countries (Canada, China, Germany, Italy, Japan, Malaysia, the UK, and the USA), and included individuals aged 18 years or older with an estimated glomerular filtration rate (eGFR) of 20 to less than 45 mL/min per 1·73 m2, or with an eGFR of 45 to less than 90 mL/min per 1·73 m2 with a urinary albumin-to-creatinine ratio (uACR) of 200 mg/g or higher. We explored the effects of 10 mg oral empagliflozin once daily versus placebo on the annualised rate of change in estimated glomerular filtration rate (eGFR slope), a tertiary outcome. We studied the acute slope (from randomisation to 2 months) and chronic slope (from 2 months onwards) separately, using shared parameter models to estimate the latter. Analyses were done in all randomly assigned participants by intention to treat. EMPA-KIDNEY is registered at ClinicalTrials.gov, NCT03594110. FINDINGS Between May 15, 2019, and April 16, 2021, 6609 participants were randomly assigned and then followed up for a median of 2·0 years (IQR 1·5-2·4). Prespecified subgroups of eGFR included 2282 (34·5%) participants with an eGFR of less than 30 mL/min per 1·73 m2, 2928 (44·3%) with an eGFR of 30 to less than 45 mL/min per 1·73 m2, and 1399 (21·2%) with an eGFR 45 mL/min per 1·73 m2 or higher. Prespecified subgroups of uACR included 1328 (20·1%) with a uACR of less than 30 mg/g, 1864 (28·2%) with a uACR of 30 to 300 mg/g, and 3417 (51·7%) with a uACR of more than 300 mg/g. Overall, allocation to empagliflozin caused an acute 2·12 mL/min per 1·73 m2 (95% CI 1·83-2·41) reduction in eGFR, equivalent to a 6% (5-6) dip in the first 2 months. After this, it halved the chronic slope from -2·75 to -1·37 mL/min per 1·73 m2 per year (relative difference 50%, 95% CI 42-58). The absolute and relative benefits of empagliflozin on the magnitude of the chronic slope varied significantly depending on diabetes status and baseline levels of eGFR and uACR. In particular, the absolute difference in chronic slopes was lower in patients with lower baseline uACR, but because this group progressed more slowly than those with higher uACR, this translated to a larger relative difference in chronic slopes in this group (86% [36-136] reduction in the chronic slope among those with baseline uACR <30 mg/g compared with a 29% [19-38] reduction for those with baseline uACR ≥2000 mg/g; ptrend<0·0001). INTERPRETATION Empagliflozin slowed the rate of progression of chronic kidney disease among all types of participant in the EMPA-KIDNEY trial, including those with little albuminuria. Albuminuria alone should not be used to determine whether to treat with an SGLT2 inhibitor. FUNDING Boehringer Ingelheim and Eli Lilly.
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T, Tamori Y, Tamura R, Tamura Y, Tan CHH, Tan EZZ, Tanabe A, Tanabe K, Tanaka A, Tanaka A, Tanaka N, Tang S, Tang Z, Tanigaki K, Tarlac M, Tatsuzawa A, Tay JF, Tay LL, Taylor J, Taylor K, Taylor K, Te A, Tenbusch L, Teng KS, Terakawa A, Terry J, Tham ZD, Tholl S, Thomas G, Thong KM, Tietjen D, Timadjer A, Tindall H, Tipper S, Tobin K, Toda N, Tokuyama A, Tolibas M, Tomita A, Tomita T, Tomlinson J, Tonks L, Topf J, Topping S, Torp A, Torres A, Totaro F, Toth P, Toyonaga Y, Tripodi F, Trivedi K, Tropman E, Tschope D, Tse J, Tsuji K, Tsunekawa S, Tsunoda R, Tucky B, Tufail S, Tuffaha A, Turan E, Turner H, Turner J, Turner M, Tuttle KR, Tye YL, Tyler A, Tyler J, Uchi H, Uchida H, Uchida T, Uchida T, Udagawa T, Ueda S, Ueda Y, Ueki K, Ugni S, Ugwu E, Umeno R, Unekawa C, Uozumi K, Urquia K, Valleteau A, Valletta C, van Erp R, Vanhoy C, Varad V, Varma R, Varughese A, Vasquez P, Vasseur A, Veelken R, Velagapudi C, Verdel K, Vettoretti S, Vezzoli G, Vielhauer V, Viera R, Vilar E, Villaruel S, Vinall L, Vinathan J, Visnjic M, Voigt E, von-Eynatten M, Vourvou M, Wada J, Wada J, Wada T, Wada Y, Wakayama K, Wakita Y, Wallendszus K, Walters T, Wan Mohamad WH, Wang L, Wang W, Wang X, Wang X, Wang Y, Wanner C, Wanninayake S, Watada H, Watanabe K, Watanabe K, Watanabe M, Waterfall H, Watkins D, Watson S, Weaving L, Weber B, Webley Y, Webster A, Webster M, Weetman M, Wei W, Weihprecht H, Weiland L, Weinmann-Menke J, Weinreich T, Wendt R, Weng Y, Whalen M, Whalley G, Wheatley R, Wheeler A, Wheeler J, Whelton P, White K, Whitmore B, Whittaker S, Wiebel J, Wiley J, Wilkinson L, Willett M, Williams A, Williams E, Williams K, Williams T, Wilson A, Wilson P, Wincott L, Wines E, Winkelmann B, Winkler M, Winter-Goodwin B, Witczak J, Wittes J, Wittmann M, Wolf G, Wolf L, Wolfling R, Wong C, Wong E, Wong HS, Wong LW, Wong YH, Wonnacott A, Wood A, Wood L, Woodhouse H, Wooding N, Woodman A, Wren K, Wu J, Wu P, Xia S, Xiao H, Xiao X, Xie Y, Xu C, Xu Y, Xue H, Yahaya H, Yalamanchili H, Yamada A, Yamada N, Yamagata K, Yamaguchi M, Yamaji Y, Yamamoto A, Yamamoto S, Yamamoto S, Yamamoto T, Yamanaka A, Yamano T, Yamanouchi Y, Yamasaki N, Yamasaki Y, Yamasaki Y, Yamashita C, Yamauchi T, Yan Q, Yanagisawa E, Yang F, Yang L, Yano S, Yao S, Yao Y, Yarlagadda S, Yasuda Y, Yiu V, Yokoyama T, Yoshida S, Yoshidome E, Yoshikawa H, Young A, Young T, Yousif V, Yu H, Yu Y, Yuasa K, Yusof N, Zalunardo N, Zander B, Zani R, Zappulo F, Zayed M, Zemann B, Zettergren P, Zhang H, Zhang L, Zhang L, Zhang N, Zhang X, Zhao J, Zhao L, Zhao S, Zhao Z, Zhong H, Zhou N, Zhou S, Zhu D, Zhu L, Zhu S, Zietz M, Zippo M, Zirino F, Zulkipli FH. Impact of primary kidney disease on the effects of empagliflozin in patients with chronic kidney disease: secondary analyses of the EMPA-KIDNEY trial. Lancet Diabetes Endocrinol 2024; 12:51-60. [PMID: 38061372 DOI: 10.1016/s2213-8587(23)00322-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 12/23/2023]
Abstract
BACKGROUND The EMPA-KIDNEY trial showed that empagliflozin reduced the risk of the primary composite outcome of kidney disease progression or cardiovascular death in patients with chronic kidney disease mainly through slowing progression. We aimed to assess how effects of empagliflozin might differ by primary kidney disease across its broad population. METHODS EMPA-KIDNEY, a randomised, controlled, phase 3 trial, was conducted at 241 centres in eight countries (Canada, China, Germany, Italy, Japan, Malaysia, the UK, and the USA). Patients were eligible if their estimated glomerular filtration rate (eGFR) was 20 to less than 45 mL/min per 1·73 m2, or 45 to less than 90 mL/min per 1·73 m2 with a urinary albumin-to-creatinine ratio (uACR) of 200 mg/g or higher at screening. They were randomly assigned (1:1) to 10 mg oral empagliflozin once daily or matching placebo. Effects on kidney disease progression (defined as a sustained ≥40% eGFR decline from randomisation, end-stage kidney disease, a sustained eGFR below 10 mL/min per 1·73 m2, or death from kidney failure) were assessed using prespecified Cox models, and eGFR slope analyses used shared parameter models. Subgroup comparisons were performed by including relevant interaction terms in models. EMPA-KIDNEY is registered with ClinicalTrials.gov, NCT03594110. FINDINGS Between May 15, 2019, and April 16, 2021, 6609 participants were randomly assigned and followed up for a median of 2·0 years (IQR 1·5-2·4). Prespecified subgroupings by primary kidney disease included 2057 (31·1%) participants with diabetic kidney disease, 1669 (25·3%) with glomerular disease, 1445 (21·9%) with hypertensive or renovascular disease, and 1438 (21·8%) with other or unknown causes. Kidney disease progression occurred in 384 (11·6%) of 3304 patients in the empagliflozin group and 504 (15·2%) of 3305 patients in the placebo group (hazard ratio 0·71 [95% CI 0·62-0·81]), with no evidence that the relative effect size varied significantly by primary kidney disease (pheterogeneity=0·62). The between-group difference in chronic eGFR slopes (ie, from 2 months to final follow-up) was 1·37 mL/min per 1·73 m2 per year (95% CI 1·16-1·59), representing a 50% (42-58) reduction in the rate of chronic eGFR decline. This relative effect of empagliflozin on chronic eGFR slope was similar in analyses by different primary kidney diseases, including in explorations by type of glomerular disease and diabetes (p values for heterogeneity all >0·1). INTERPRETATION In a broad range of patients with chronic kidney disease at risk of progression, including a wide range of non-diabetic causes of chronic kidney disease, empagliflozin reduced risk of kidney disease progression. Relative effect sizes were broadly similar irrespective of the cause of primary kidney disease, suggesting that SGLT2 inhibitors should be part of a standard of care to minimise risk of kidney failure in chronic kidney disease. FUNDING Boehringer Ingelheim, Eli Lilly, and UK Medical Research Council.
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AOKI R, NIhei Y, Matsuzaki K, Suzuki H, Kihara M, Yokoo T, Kashihara N, Narita I, Suzuki Y. POS-887 GROSS HEMATURIA AFTER SARS-CoV-2 VACCINATION: QUESTIONNAIRE SURVEY IN JAPAN. Kidney Int Rep 2022. [PMCID: PMC8854879 DOI: 10.1016/j.ekir.2022.01.926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Tateyama Y, Techasrivichien T, Musumari PM, Macwan’gi M, Zulu R, Dube C, Suguimoto SP, Ono-Kihara M, Kihara M. Prevalence and correlates of elevated HbA1c in rural Zambia: A population-based cross-sectional study. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa165.593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Diabetes mellitus (DM) poses a serious challenge to the health systems in sub-Saharan Africa. In Zambia, the estimated prevalence of DM among adults was 4.2% in 2016. However, little is known about its magnitude among the rural population. To address this gap, we investigated the prevalence of DM and its correlates among rural residents in Zambia.
Methods
In 2016, we recruited 690 rural residents aged 25-64 of Mumbwa district by multistage, clustered, household sampling. Questionnaire survey was conducted along with anthropometric and biological measurements including HbA1c. Data analysis was adjusted for complex sampling.
Results
The prevalence of elevated HbA1c (≥5.7) was 41% (Men 34%, Women 48%). DM, defined as HbA1c ≥ 6.5%, was present in 2.6% of the participants. Sixteen percent of men and 37% of women were overweight or obese (BMI≥25). In multivariable analysis, high cooking oil intake and obesity (BMI≥30) were associated with higher odds of elevated HbA1c (adjusted odds ratio [AOR]=1.76 and 3.30), but the association was inverse for alcohol intake (AOR≈0.55). By gender, obesity was positively associated with an elevated HbA1c in both genders (AOR= men 6.57, women 2.11). Secondary education was inversely (AOR=0.52), and high sugar intake was positively (AOR=1.66) associated with elevated HbA1c in men. Older age and high cooking oil intake were positively associated (AOR=1.89 and 2.14), and alcohol intake (AOR=0.46) was inversely associated with elevated HbA1c in women.
Conclusions
More than 40% of rural residents in Zambia had elevated HbA1c. The risk factor profile was different between genders. Obesity increased the odds of elevated HbA1c in both genders, but the odds was disproportionately higher in men than in women. The reasons for such gender difference remain unknown, but we speculate that it might be explained by the early onset of obesity in women. Such gender difference should be addressed in health interventions in this population.
Key messages
Over 40% of rural residents in Zambia are at risk of prediabetes or diabetes. Health interventions should address the gender difference in the risk of elevated HbA1c.
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Affiliation(s)
- Y Tateyama
- Kyoto University Health Service, Kyoto, Japan
- Global Health Interdisciplinary Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
- International Institute of Socio-epidemiology, Kyoto, Japan
| | - T Techasrivichien
- Global Health Interdisciplinary Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
- International Institute of Socio-epidemiology, Kyoto, Japan
| | - P M Musumari
- Global Health Interdisciplinary Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
- International Institute of Socio-epidemiology, Kyoto, Japan
| | - M Macwan’gi
- Institute of Economic and Social Research, The University of Zambia, Lusaka, Zambia
| | - R Zulu
- Institute of Economic and Social Research, The University of Zambia, Lusaka, Zambia
| | - C Dube
- Ndola District Health Office, Ndola, Zambia
| | - S P Suguimoto
- Global Health Interdisciplinary Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
- International Institute of Socio-epidemiology, Kyoto, Japan
| | - M Ono-Kihara
- Global Health Interdisciplinary Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
- International Institute of Socio-epidemiology, Kyoto, Japan
| | - M Kihara
- Global Health Interdisciplinary Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
- International Institute of Socio-epidemiology, Kyoto, Japan
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Hoki T, Kanatani R, Saito W, Iimure T, Zhou T, Takoi K, Tanigawa A, Kihara M, Ogushi K. Breeding of lipoxygenase-1-less malting barley variety ‘Satuiku 2 go’. J Inst Brew 2018. [DOI: 10.1002/jib.483] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- T. Hoki
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
| | - R. Kanatani
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
| | - W. Saito
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
| | - T. Iimure
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
| | - T.S. Zhou
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
| | - K. Takoi
- Product and Technology Innovation Department; Sapporo Breweries Ltd, 1-10 Okatome, Yaizu Shizuoka 425-0013 Japan
| | - A. Tanigawa
- Product and Technology Innovation Department; Sapporo Breweries Ltd, 1-10 Okatome, Yaizu Shizuoka 425-0013 Japan
| | - M. Kihara
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
| | - K. Ogushi
- Bioresources Research and Development Department; Sapporo Breweries Ltd, 37-1 Nittakizaki, Ota Gunma 370-0393 Japan
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Sakai R, Kasai S, Hirano F, Kihara M, Yokoyama W, Tsutsumino M, Nagasaka K, Koike R, Yamanaka H, Miyasaka N, Harigai M. FRI0146 Incidence Rate and The Risk of Herpes Zoster in Patients with Rheumatoid Arthritis Using Japanese Health Insurance Database. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Kihara M, Kearsley-Fleet L, Davies R, Watson K, Lunt M, Symmons D, Hyrich K. FRI0145 Choice and Effectiveness of Tocilizumab Among Patients with Rheumatoid Arthritis: An Observational Study from the British Society for Rheumatology Biologics Register for Rheumatoid Arthritis. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Sakai R, Hirano F, Kihara M, Yokoyama W, Yamazaki H, Koike R, Miyasaka N, Harigai M. FRI0088 Prevalence of Comorbidities in Patients with Rheumatoid Arthritis Using Japanese Health Insurance Database. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.1296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Abstract
Sixty-one Japanese with sexually transmitted HIV were investigated to clarify the state of, and difficulties in, their sexual activities and social relationships. The study revealed the following difficulties in social relationships due to HIV infection. Thirty-one per cent had experienced discrimination or breach of confidentiality. Self-restriction due to anxiety over discrimination was observed in approximately 90%, and the self-restriction score tended to be higher in those who were not employed, those with economic problems, those who were in a relatively poor state of health, those who had developed AIDS and those who had previously experienced discrimination or breach of confidentiality. The experience of discrimination or breach of confidentiality, and the experience of receiving negative support tended to increase as the respondents had a wider emotional support network. About 60% were dissatisfied with their sex lives, and the degree of satisfaction was significantly lower in those who had fewer sexual contacts and those who had a suppressive attitude toward sexual contacts. A low degree of satisfaction with sex life was found to be an important factor that escalates the level of depression or anxiety.
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Affiliation(s)
- Y Inoue
- Department of Health Sociology, School of Health Sciences and Nursing, University of Tokyo, Tokyo, Japan.
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Baasanjav B, Usui H, Kihara M, Kaku H, Nakada E, Tate S, Mitsuhashi A, Matsui H, Shozu M. The risk of post-molar gestational trophoblastic neoplasia is higher in heterozygous than in homozygous complete hydatidiform moles. Hum Reprod 2010; 25:1183-91. [PMID: 20208060 DOI: 10.1093/humrep/deq052] [Citation(s) in RCA: 28] [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: 11/14/2022] Open
Abstract
BACKGROUND Complete hydatidiform mole (CHM) is a high-risk pregnancy for gestational trophoblastic neoplasia (GTN). Patients with CHM have a 10-30% chance of trophoblastic sequelae. CHM includes androgenic homozygous (monospermic) and androgenic heterozygous (dispermic) moles. It is controversial whether the risk of GTN is higher with heterozygous than with homozygous CHM. A prospective cohort study was conducted to assess risk of GTN in homozygous and heterozygous CHM using short tandem repeat (STR) polymorphisms, and a meta-analysis of previous reports. METHODS Twenty-eight consecutive molar pregnancies were evacuated and followed by regular hCG measurements to detect GTN. Persistent GTN was diagnosed according to the International Federation of Gynecology and Obstetrics 2000 system. Cytogenesis of the mole was determined by STR polymorphisms of molar tissue and parental blood. A meta-analysis of the GTN rate from previous reports was conducted using Mantel-Haenszel methods. RESULTS Of 28 molar pregnancies, 24 were homozygous and three were heterozygous CHM. The remaining mole was diandric triploidy (a partial hydatidiform mole). Of the 24 homozygous CHMs, six (25%) cases developed GTN and received chemotherapy. Meanwhile, all three cases (100%) of heterozygous mole developed GTN and needed chemotherapy. The GTN risk was higher in heterozygous (P = 0.029, Fisher's exact test) than homozygous moles. A systematic review revealed only five previous reports (with more than 15 cytogenetically diagnosed cases), and the pooled relative risk of persistent GTN for heterozygous mole was not significant (odds ratio, 2.0; 95% confidence interval, 0.98-4.07). CONCLUSIONS Heterozygous CHM had a higher risk for GTN than homozygous CHM.
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Affiliation(s)
- B Baasanjav
- Department of Reproductive Medicine, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
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Yagi M, Ninomiya K, Kihara M, Horiuchi Y. Long-term surgical outcome and risk factors in patients with cervical myelopathy and a change in signal intensity of intramedullary spinal cord on Magnetic Resonance imaging. J Neurosurg Spine 2010; 12:59-65. [PMID: 20043766 DOI: 10.3171/2009.5.spine08940] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT The goal of this study was to determine the long-term clinical significance of and the risk factors for intramedullary signal intensity change on MR images in patients with cervical compression myelopathy (CCM), an entity most commonly seen with cervical spondylotic myelopathy and ossification of the posterior longitudinal ligament (OPLL). METHODS One hundred seventy-four patients with CCM but without cervical disc herniation, severe OPLL (in which the cervical canal is < 10 mm due to OPLL), or severe kyphotic deformity (> 15 degrees of cervical kyphosis) who underwent surgery were initially selected. One hundred eight of these patients were followed for > 36 months, and the 71 patients who agreed to MR imaging examinations both pre- and postsurgery were enrolled in the study (the mean follow-up duration was 60.6 months). All patients underwent cervical laminoplasty. The authors used the Japanese Orthopaedic Association (JOA) score and recovery ratio for evaluation of pre- and postoperative outcomes. The multifactorial effects of variables such as age, sex, a history of smoking, diabetes mellitus, duration of symptoms, postoperative expansion of the high signal intensity area of the spinal cord on MR imaging, sagittal arrangement of the cervical spine, presence of ventral spinal cord compression, and presence of an unstable cervical spine were studied. RESULTS Change in intramedullary signal intensity was observed in 50 of the 71 patients preoperatively. The pre- and postoperative JOA scores and the recovery ratio were significantly lower in the patients with signal intensity change. The mean JOA score of the upper extremities was also significantly lower in these patients. Twenty-one patients showed hypointensity in their T1-weighted images, and a nonsignificant correlation was observed between intensity in the T1-weighted image and the mean JOA score and recovery ratio. The risk factors for signal intensity change were instability of the cervical spine (OR 8.255, p = 0.037) and ventral spinal cord compression (OR 5.502, p < 0.01). Among these patients, 16 had postoperative expansion of the high signal intensity area of the spinal cord. The mean JOA score and the recovery ratio at the final follow-up were significantly lower in these patients. The risk factor for postoperative expansion of the high signal intensity area was instability of the cervical spine (OR 5.509, p = 0.022). No significant correlation was observed between signal intensity on T1-weighted MR images and postoperative expansion of the intramedullary high signal intensity area on T2-weighted MR images. CONCLUSIONS Long-term clinical outcome was significantly worse in patients with intramedullary signal intensity changes on MR images. The risk factors were instability of the cervical spine and severe ventral spinal compression. The long-term clinical outcome was also significantly worse in patients with postoperative expansion of the high signal intensity area. The fact that cervical instability was a risk factor for the postoperative expansion of the high signal intensity indicates that this high signal intensity area occurred, not only from necrosis secondary to ischemia of the anterior spinal artery, but also from the repeated minor traumas inflicted on the spinal cord from an unstable cervical spine. The long-term neurological outcome found in the preliminary study of patients with CCM who had cervical instability and intramedullary signal intensity changes on MR images suggests that surgical treatment should include posterior fixation along with cervical laminoplasty or anterior spinal fusion.
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Affiliation(s)
- Mitsuru Yagi
- Orthopedic Surgery, Kawasaki Municipal Hospital, Kawasaki City, Japan.
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Abstract
Whereas osteochondroma is a common benign bone tumor in adolescence, it is rarely observed in elderly patients. It is unknown why osteochondromas, which usually develop during skeletal growth, rarely develop in elderly patients. The authors report 3 cases of symptomatic spinal osteochondroma in elderly patients and discuss the possible reasons for the onset of the enlargement of osteochondromas in elderly patients.
Clinical history, radiographs, MR images, and CT myelography studies were obtained in each patient and are described. A review of the relevant literature is also presented. In the first case, the cervical osteochondroma caused spinal canal compression and occipital nerve irritation. It was totally excised, which successfully relieved the pain and allowed the patient to return to normal neurological function. In the second case, total removal of the tumor was effective in alleviating clinical symptoms. In the last case, ablation of the articular facet joint partially relieved the patient's lower-back pain. In the first 2 cases, the patients suffered from psoriasis and associated psoriatic arthritis and in the last case, the patient suffered from HIV-associated psoriatic arthritis. The psoriatic arthritis was characterized as asymmetric chronic multiple-joint arthritis and was HLA B27 positive. The pathology of psoriatic arthritis was the accelerating bone turnover and ankylosis.
Symptomatic osteochondroma of the spine in elderly patients is extremely rare since it typically develops during skeletal growth. In this report, the authors show that pathological accelerating bone turnover such as psoriatic arthritis may be a possible mechanism for the onset of the enlargement of osteochondromas in elderly patients. The age of the patients in this report suggests that growth of the osteochondroma continues after skeletal development.
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Yagi M, Okada E, Ninomiya K, Kihara M. Postoperative outcome after modified unilateral-approach microendoscopic midline decompression for degenerative spinal stenosis. J Neurosurg Spine 2009; 10:293-9. [DOI: 10.3171/2009.1.spine08288] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
The object of this study was to assess the feasibility and efficacy of a novel, minimally invasive spinal surgery technique to correct degenerative lumbar spinal stenosis involving a modified unilateral-approach microendoscopic midline decompression.
Methods
In this prospective study, 41 patients with lumbar stenosis were randomly assigned to undergo either a novel, median-approach microendoscopic laminectomy (20 patients) or a conventional laminectomy (21 patients). Spinal anteroposterior diameter, cross-sectional area, lateral recess distance, spinal stability, postoperative back pain, functional outcomes, and muscle trauma were evaluated. Follow-up ranged from 16 to 24 months, with a mean of 17.8 months for the novel procedure group and 18.6 months for the conventional laminectomy group.
Results
Compared with patients in the conventional laminectomy group, patients who received the novel procedure had a reduced mean duration of hospital stay, a lower mean creatine phosphokinase muscular-type isoenzyme level, a lower visual analog scale score for back pain at 1-year follow-up, and a faster recovery rate. These patients also had less mean blood loss compared with the conventionally treated group. Satisfactory neurological decompression and symptom relief were achieved in 90% of these patients. There was no significant clinical difference compared with the conventional laminectomy group's results. There was no evidence of spinal instability in any patient, and no patient required a follow-up conventional laminectomy.
Conclusions
This novel procedure provides effective spinal decompression. Although this method requires more operating time than a conventional method, it requires only minimal muscle trauma and spinal stability maintenance, and allows for early mobilization. This shortens the hospital stay, reduces postoperative back pain, and leads to satisfactory neurological and functional outcomes. Moreover, with the midline approach, decompression was accomplished without compromising the facet joints, even with a narrow width of lamina.
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Ishikawa H, Reierstad S, Kasai T, Kihara M, Shozu M, Bulun S. Aromatase gene expression in uterine leiomyoma from African-American women is dramatically higher compared with other races. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Yabe H, Takano Y, Nomura E, Nakayama M, Kihara M, Miyakawa SI, Horiuchi Y. Two cases of SAPHO syndrome accompanied by classic features of Behcet's disease and review of the literature. Clin Rheumatol 2007; 27:133-5. [PMID: 17717714 DOI: 10.1007/s10067-007-0697-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 05/31/2007] [Revised: 06/23/2007] [Accepted: 06/25/2007] [Indexed: 11/29/2022]
Abstract
We describe two patients with SAPHO (synovitis-acne-pustulosis-hyperostosis-ostitis) syndrome who presented some of the classic features of Behcet's disease. The first case is a man diagnosed as SAPHO at 74 years old. His major complaint is pain and swelling of the bilateral sterno-clavicular region for more than 14 years. Another conspicuous complication was bilateral glaucoma and episodes of iritis were recognized during the follow-up period. The second case is a 65-year-old woman, who first consulted us with right knee pain. As she had a past history of palmoplantar pustulosis and anterior chest pain, her sterile knee arthritis was diagnosed as SAPHO. She also had been suffering from recurrent oral aphthous ulceration since 6 months before visiting our hospital. Considering the clinical courses of our two cases and a review of five previously reported cases, these conditions may imply that classic features of Behcet's disease are minor complications of SAPHO syndrome. Human leukocyte antigen typing and frequent association of sacroiliitis in our cases and in the review of the literature for SAPHO syndrome with some of the classic features of Behcet's disease may indicate this condition to be a closely related disease with seronegative spondylo-arthritis.
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Affiliation(s)
- Hiroki Yabe
- Department of Orthopaedic Surgery, National Hospital Organization Tokyo Medical Center, Higashigaoka 2-5-1, Meguro-ku, Tokyo, 152-8902, Japan.
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Suzuki H, Suzuki Y, Aizawa M, Yamanaka T, Kihara M, Pang H, Horikoshi S, Tomino Y. Th1 polarization in murine IgA nephropathy directed by bone marrow-derived cells. Kidney Int 2007; 72:319-27. [PMID: 17495863 DOI: 10.1038/sj.ki.5002300] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
IgA nephropathy is the most common form of progressive glomerulonephritis although the pathophysiology of this nephropathy is unclear. The ddY mouse is a spontaneous animal model with variable incidence and extent of glomerular injury mimicking human IgA nephropathy. Here, we transplanted bone marrow cells from 20-week-old ddY mice with beginning or quiescent IgA nephropathy into irradiated similar ddY mice, C57Bl/6 (Th1 prone) mice, or BALB/c (Th2 prone) mice. Serum IgA/IgG complex and Th1/Th2 polarization of spleen cells was determined by enzyme-linked immunosorbent assay and confirmed by fluorescent cytometric analysis. The ddY mice with commencing IgA nephropathy demonstrated strong polarization toward Th1, while those with quiescent disease were Th2 polarized. Serum levels of IgA/IgG2a immune complex significantly correlated with the severity of the glomerular lesions. Bone marrow taken from mice with commencing IgA nephropathy conferred IgA nephropathy with Th1 polarization in recipient-quiescent mice, while transplantation from the quiescent mice ablated glomerular injury and mesangial IgA/IgG deposition in those commencing IgA disease. However, adoptive transfer of CD4(+) T cells from those whose disease began failed to induce any IgA deposition or renal injury. Our study suggests that bone marrow cells, presuming IgA producing cells, may initiate this disease. Th1 cells may be involved in the pathophysiology of the disease after glomerular IgA deposition.
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Affiliation(s)
- H Suzuki
- Division of Nephrology, Department of Internal Medicine, Juntendo University School of Medicine, Tokyo, Japan
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Kuzumoto Y, Kusunoki S, Kato N, Kihara M, Low PA. Effect of the aldose reductase inhibitor fidarestat on experimental diabetic neuropathy in the rat. Diabetologia 2006; 49:3085-93. [PMID: 17063327 DOI: 10.1007/s00125-006-0400-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2005] [Accepted: 06/30/2006] [Indexed: 11/25/2022]
Abstract
AIMS/HYPOTHESIS Fidarestat, an aldose reductase inhibitor (ARI), has been reported to improve clinical symptoms and nerve conduction deficits in human diabetic neuropathy. We evaluated the dose-dependency and some of the mechanisms of the drug action in experimental diabetic neuropathy (EDN). METHODS Control rats and rats with EDN were fed on normal pellets or pellets containing 0.00066% (1 mg/kg) or 0.00263% (4 mg/kg) fidarestat for 10 weeks. We evaluated the effect of fidarestat on nerve blood flow (NBF), electrophysiology, and sorbitol and fructose content in sciatic nerve in control and diabetic rats. For detection of oxidative stress in peripheral nerve, we measured sciatic nerve reduced glutathione (GSH) and 8-hydroxy-2'-deoxyguanosine (8-OHdG) immunolabelling of dorsal root ganglion (DRG) neurons. RESULTS NBF, compound muscle action potential and amplitude of C-potential were significantly improved in diabetic rats fed on the diet supplemented with fidarestat. Fidarestat suppressed the increase in sorbitol and fructose, normalised GSH in sciatic nerve, and reduced the number of 8-OHdG-positive cells in DRG. CONCLUSIONS/INTERPRETATION Fidarestat improves neuropathy, presumably via an improvement in oxidative stress. This study supports a role for fidarestat in the treatment of diabetic neuropathy.
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Affiliation(s)
- Y Kuzumoto
- Department of Neurology, Kinki University, School of Medicine, 377-2 Ohno-Higashi Osaka-Sayama, Osaka, Japan.
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18
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Tsurumi Y, Tamura K, Tanaka Y, Koide Y, Sakai M, Yabana M, Noda Y, Hashimoto T, Kihara M, Hirawa N, Toya Y, Kiuchi Y, Iwai M, Horiuchi M, Umemura S. Interacting molecule of AT1 receptor, ATRAP, is colocalized with AT1 receptor in the mouse renal tubules. Kidney Int 2006; 69:488-94. [PMID: 16514431 DOI: 10.1038/sj.ki.5000130] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The renin-angiotensin system in the kidney plays a critical role in the regulation of renal hemodynamics and sodium handling through the activation of vascular, glomerular and tubular angiotensin II type 1 (AT1) receptor-mediated signaling. We previously cloned a molecule that specifically bound to the AT1 receptor and modulated AT1 receptor signaling in vitro, which we named ATRAP (for AT1 receptor-associated protein). The purpose of this study is to analyze the renal distribution of ATRAP and to examine whether ATRAP is co-expressed with the AT1 receptor in the mouse kidney. We performed in situ hybridization, Western blot analysis, and immunohistochemistry to investigate the expression of ATRAP mRNA and protein in the mouse kidney. The results of Western blot analysis revealed the ATRAP protein to be abundantly expressed in the kidney. Employing in situ hybridization and immunohistochemistry, we found that both ATRAP mRNA and the protein were widely distributed along the renal tubules from Bowman's capsules to the inner medullary collecting ducts. ATRAP mRNA was also detected in the glomeruli, vasculature, and interstitial cells. In all tubular cells, the ATRAP protein colocalized with the AT1 receptor. Finally, we found that the dietary salt depletion significantly decreased the renal expression of ATRAP as well as AT1 receptor. These findings show ATRAP to be abundantly and broadly distributed in nephron segments where the AT1 receptor is expressed. Furthermore, this is the first report demonstrating a substantial colocalization of ATRAP and AT1 receptor in vivo.
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MESH Headings
- Adaptor Proteins, Signal Transducing/analysis
- Adaptor Proteins, Signal Transducing/genetics
- Adaptor Proteins, Signal Transducing/physiology
- Animals
- Blotting, Western
- Diet, Sodium-Restricted
- Gene Expression Regulation/drug effects
- Immunohistochemistry
- In Situ Hybridization
- Kidney Glomerulus/chemistry
- Kidney Glomerulus/physiology
- Kidney Tubules/chemistry
- Kidney Tubules/physiology
- Male
- Mice
- Mice, Inbred C57BL
- RNA, Messenger/analysis
- RNA, Messenger/genetics
- Receptor, Angiotensin, Type 1/analysis
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 1/physiology
- Renin-Angiotensin System/physiology
- Signal Transduction
- Sodium/pharmacology
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Affiliation(s)
- Y Tsurumi
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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19
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Inokuchi Y, Morohashi T, Kawana I, Nagashima Y, Kihara M, Umemura S. Amelioration of 2,4,6-trinitrobenzene sulphonic acid induced colitis in angiotensinogen gene knockout mice. Gut 2005; 54:349-56. [PMID: 15710982 PMCID: PMC1774407 DOI: 10.1136/gut.2003.036343] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Revised: 07/25/2004] [Accepted: 07/29/2004] [Indexed: 12/17/2022]
Abstract
BACKGROUND A number of recent studies have demonstrated a protective effect of renin-angiotensin system (RAS) antagonism against immune mediated diseases such as myocarditis, chronic allograft rejection, and antiglomerular basement membrane nephritis. To our knowledge, there has been no report on the immunological contribution of the RAS in colonic tissue. AIMS We evaluated the direct effect of angiotensin II (AII) on the pathogenesis of immune mediated colitis using angiotensinogen deficient homozygous (Atg-/-) mice. SUBJECTS 2,4,6-Trinitrobenzene sulphonic acid (TNBS) colitis was induced in Atg-/- and wild-type (Atg+/+) mice. METHODS Levels of proinflammatory cytokines in the colon were determined by enzyme linked immunosorbent assay. Histological analysis was performed simultaneously. RESULTS Although Atg-/- mice developed colitis, the degree was much milder than that in Atg+/+ mice (p<0.05). Colonic cytokine analysis showed that the production of proinflammatory cytokines (interleukin (IL)-1beta, interferon gamma (IFN-gamma)) was impaired in Atg-/- mice. Furthermore, expression of cytokines such as IL-4 and IL-10 in the colon was predominant in Atg-/- compared with Atg+/+ mice after TNBS instillation (p<0.005, p<0.01, respectively). Similarly, subcutaneous infusion of losartan suppressed colitis (p<0.05) and the production of proinflammatory cytokines (IL-1beta, IFN-gamma). These results indicate that the RAS is directly involved in the pathogenesis of TNBS colitis through regulation of proinflammatory and anti-inflammatory cytokines in the colon. CONCLUSIONS This study revealed that the RAS is involved in the immune system in the colon. Antagonism of the RAS is a potential prophylactic strategy for the treatment of human inflammatory bowel disease.
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Affiliation(s)
- Y Inokuchi
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine and School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-0004, Japan.
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20
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Yamauchi A, Kontani K, Kihara M, Yokomise H, Nishi N, Hirashima M. P34 Galectin-9 is a possible prognostic factor withanti-metastatic potential for breast cancer. Breast 2005. [DOI: 10.1016/s0960-9776(05)80073-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Abstract
The crude methanolic extracts of the leaves, stem bark, stem heart wood, root bark and root heart wood of Euroschinus papuanus and the fractions obtained on partitioning with petrol, dichloromethane (D), ethyl acetate (E) and butanol (B), exhibited a broad spectrum antibacterial activity. Fractionation drastically enhanced the activity. Excellent activity was demonstrated by the E fractions of stem heart wood, D of root bark, and E of root heart wood. Antifungal activity was exhibited by the B fractions of leaves, stem heartwood and root bark.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B., Lae, Papua New Guinea.
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22
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Okano Y, Hirawa N, Tamura K, Kihara M, Toya Y, Tochikubo O, Umemura S. RELATIONSHIPS BETWEEN DIURNAL BLOOD PRESSURE VARIATION, AUTONOMIC FUNCTION AND HEALTH-RELATED QOL IN HYPERTENSIVE SUBJECTS. J Hypertens 2004. [DOI: 10.1097/00004872-200402001-00816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The crude methanolic extracts of the leaves, stem and root barks of Alstonia scholaris and Leea tetramera on partitioning (petrol, dichloromethane, ethyl acetate, butanol) gave fractions exhibiting improved and broader spectrum of antibacterial activity. Especially the butanol fractions of A. scholaris and the root bark of L. tetramera. None of the fractions were active against the fungi tested.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B. Lae, Papua New Guinea.
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Abstract
The crude methanolic extracts of the stem and root barks, stem and root heart-wood, leaves, fruits and seeds of Artocarpus heterophyllus and their subsequent partitioning with petrol, dichloromethane, ethyl acetate and butanol gave fractions that exhibited a broad spectrum of antibacterial activity. The butanol fractions of the root bark and fruits were found to be the most active. None of the fractions were active against the fungi tested.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, PMB, Lae, Papua New Guinea.
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25
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Abstract
The methanol extracts of leaves, root and stem barks of Calophyllum soulattri were partitioned with petrol, dichloromethane, ethyl acetate. The extracts demonstrated a range of antibacterial activity, improved on fractionation. None were found to be active against the moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, PMB Lae, Papua New Guinea.
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26
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Abstract
A broad spectrum of antibacterial activity was exhibited by the methanol extracts of leaves, root and stem barks of Terminalia complanata and Flacourtia zippelii and their subsequent fractions (petrol, dichloromethane, ethyl acetate). Fractionation enhanced the activity particularly in the ethyl acetate fractions of the stem and root barks of T. complanata. No activity was observed against the moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, PMB Lae, Papua New Guinea.
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Abstract
The methanol extracts of leaves, seeds, stem and root barks, stem and root heart-woods of Michelia champaca and the obtained fractions (petrol, dichloromethane, ethyl acetate, butanol) exhibited a broad spectrum of antibacterial activity. Fractionation drastically enhanced the level of activity particularly in all fractions of the stem bark and dichloromethane fraction of the root bark. Some fractions of the leaves, stem and root barks demonstrated antifungal activity against some of the tested moulds. Liriodenine was the active constituent of the root bark, with a broader and, in some cases, better level of activity as compared to the standard.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, PMB Lae, Papua New Guinea.
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28
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Yasuda G, Kuji T, Hasegawa K, Hirawa N, Kihara M, Toya Y, Shionoiri H, Umemura S. Safety and efficacy of a biliary-excreted angiotensin converting enzyme (ACE) inhibitor, temocapril, in combination with amlodipine in advanced diabetic nephropathy. Clin Exp Nephrol 2002. [DOI: 10.1007/s101570200039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kihara M, Yokomise H, Irie A, Kobayashi S, Kushida Y, Yamauchi A. Malignant adenomyoepithelioma of the breast with lung metastases: report of a case. Surg Today 2002; 31:899-903. [PMID: 11759886 DOI: 10.1007/s005950170031] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Adenomyoepithelioma of the breast is a rare lesion, and has a bicellular pattern of epithelial and myoepithelial cells which are regularly distributed in the tubular structures based on the histologic and ultrastructural features. It is thought to be a benign or a low-grade malignant disease. We herein describe a case of malignant adenomyoepithelioma of the breast with lung metastases in an 86-year-old woman. A primary massive tumor in the left breast grew rapidly within a short period of time. A simple mastectomy with sampling of the axillary lymph nodes was performed. The obtained lymph nodes did not include any metastatic lesions. Malignancy was evidenced by the presence of a high mitotic rate and severe nuclear atypia. Three months after the operation, radiology showed multiple lung metastases, and the patient died 2 weeks thereafter. Reviewing the literature, nine similar cases were reported, and the prognosis of malignant adenomyoepithelioma of the breast with distant metastases was very poor with the time of recurrence varying after initial treatments. Malignant adenomyoepithelioma should be followed up with careful screening for distant metastases.
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Affiliation(s)
- M Kihara
- Second Department of Surgery, Kagawa Medical University, Kita-gun, Japan
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30
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Garte S, Gaspari L, Alexandrie AK, Ambrosone C, Autrup H, Autrup JL, Baranova H, Bathum L, Benhamou S, Boffetta P, Bouchardy C, Breskvar K, Brockmoller J, Cascorbi I, Clapper ML, Coutelle C, Daly A, Dell'Omo M, Dolzan V, Dresler CM, Fryer A, Haugen A, Hein DW, Hildesheim A, Hirvonen A, Hsieh LL, Ingelman-Sundberg M, Kalina I, Kang D, Kihara M, Kiyohara C, Kremers P, Lazarus P, Le Marchand L, Lechner MC, van Lieshout EM, London S, Manni JJ, Maugard CM, Morita S, Nazar-Stewart V, Noda K, Oda Y, Parl FF, Pastorelli R, Persson I, Peters WH, Rannug A, Rebbeck T, Risch A, Roelandt L, Romkes M, Ryberg D, Salagovic J, Schoket B, Seidegard J, Shields PG, Sim E, Sinnet D, Strange RC, Stücker I, Sugimura H, To-Figueras J, Vineis P, Yu MC, Taioli E. Metabolic gene polymorphism frequencies in control populations. Cancer Epidemiol Biomarkers Prev 2001; 10:1239-48. [PMID: 11751440] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
Using the International Project on Genetic Susceptibility to Environmental Carcinogens (GSEC) database containing information on over 15,000 control (noncancer) subjects, the allele and genotype frequencies for many of the more commonly studied metabolic genes (CYP1A1, CYP2E1, CYP2D6, GSTM1, GSTT1, NAT2, GSTP, and EPHX) in the human population were determined. Major and significant differences in these frequencies were observed between Caucasians (n = 12,525), Asians (n = 2,136), and Africans and African Americans (n = 996), and some, but much less, heterogeneity was observed within Caucasian populations from different countries. No differences in allele frequencies were seen by age, sex, or type of controls (hospital patients versus population controls). No examples of linkage disequilibrium between the different loci were detected based on comparison of observed and expected frequencies for combinations of specific alleles.
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Affiliation(s)
- S Garte
- Environmental and Occupational Health Sciences Institute, University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey 08854, USA
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Kihara M, Kamijo M, Nakasaka Y, Mitsui Y, Takahashi M, Schmelzer JD. A small dose of the immunosuppressive agent FK506 (tacrolimus) protects peripheral nerve from ischemic fiber degeneration. Muscle Nerve 2001; 24:1601-6. [PMID: 11745968 DOI: 10.1002/mus.1194] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The immunosuppressant agent FK506 (tacrolimus) has proven to be neuroprotective against brain ischemia, but there are no data on potential neuroprotective effects of FK506 in peripheral nerve ischemia. We examined the potential effects of two doses of FK506 in protecting peripheral nerve from ischemic fiber degeneration. Ischemia in the left sciatic nerve of the rat was produced by injecting 2 x 10(6) microspheres (14 microm) into the left femoral, hypogastric, and superior gluteal arteries in proportions of 47%, 37%, and 17%, respectively. After embolization, FK506 was injected into the left femoral, hypogastric, and superior gluteal arteries in doses of 9.4, 7.4, and 3.4 microg, respectively, for the high-dose group and 4.7, 3.7, and 1.7 microg, respectively, for the low-dose group. The control rats were injected with saline. FK506 treatment resulted in dramatic behavioral improvement in nerve function, in the number of functioning nerve fibers, and in the salvage of a majority of nerve fibers from ischemic fiber degeneration in a dose-dependent fashion. These results suggest that a small dose of FK506 protects peripheral nerve from ischemic fiber degeneration and that it may have potential in the treatment of ischemic neuropathy.
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Affiliation(s)
- M Kihara
- Department of Neurology, School of Medicine, Kinki University, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka 589-8511, Japan.
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Abstract
The methanol extracts of leaves, root and stem barks of Psychotria microlabastra showed a broad spectrum of antibacterial activity, that was increased on fractionation (petrol, dichloromethane, ethyl acetate), particularly in the ethyl acetate fractions. None of the extractives showed activity against the tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B. Lae, Papua New Guinea.
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Abstract
The methanol extracts of leaves, root and stem barks of Symplocos cochinchinensis and their fractions obtained by partition (petrol, dichloromethane, ethyl acetate) were screened for antimicrobial activity. All the crude extracts and fractions showed a broad spectrum of antibacterial activity, that was enhanced on fractionation. None of them showed activity against the tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B., Lae, Papua New Guinea.
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Kihara M, Sato N, Kimura H, Kamiyama M, Sekiya S, Takano H. Magnetic resonance imaging in the evaluation of vaginal foreign bodies in a young girl. Arch Gynecol Obstet 2001; 265:221-2. [PMID: 11789752 DOI: 10.1007/s004040000163] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A 7-year-old girl with foul-smelling, bloody vaginal discharge for more than 2 years was initially suspected of suffering from vaginal foreign bodies. Although plain radiography revealed no abnormal findings in the pelvis, magnetic resonance imaging (MRI) showed multiple low intensity objects and an intact vaginal wall. Four plastic toys were removed with forceps under general anesthesia. MRI is supposed to be the best technique for evaluating vaginal foreign bodies in young girls.
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Affiliation(s)
- M Kihara
- Department of Obstetrics and Gynecology, Kimitsu Chuo General Hospital, Kisarazu-shi, Chiba, Japan.
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Abstract
BACKGROUND Pediatric endocrinologists initially treat congenital adrenal hyperplasia with either cortisone acetate (CA) or hydrocortisone (HC). Despite high doses of CA, we noted that 17-hydroxyprogesterone (17-OHP) and corticotropin were not fully suppressed in serum from neonates with 21-hydroxylase deficiency (21-OHD) until they were 40- to 80-days-old. In contrast, serum concentrations of 17-OHP were suppressed immediately by oral treatment with HC. METHODS We sought to understand the reason for this discrepancy. Serum cortisol (F), cortisone (E), and 17-OHP were measured by radioimmunoassay or high-performance liquid chromatography in seven neonates with 21-OHD and in 118 normal subjects. From the time of diagnosis, CA was administered to four of the neonates with 21-OHD, while HC was given to the other three. RESULTS In normal subjects serum E concentrations were greater than F during the first 2 months after birth, whereas F concentrations exceeded E after 2 months of age. Although infants receiving CA initially were given a high dose, serum F concentrations were extremely low, while 17-OHP concentrations were high until about 2 months of age. Then serum F exceeded E, and 17-OHP became fully suppressed even though infants received only a moderate dose of CA. In contrast, HC administration successfully normalized serum 17-OHP in the neonatal period. With temporary switching of neonates from HC to CA, serum F concentrations immediately decreased and 17-OHP concentrations increased. CONCLUSION Conversion of E to F may be limited during early infancy, adversely affecting treatment with CA. Cortisone acetate may be inappropriate as a glucocorticoid replacement during early infancy in patients with 21-OHD.
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Affiliation(s)
- K Jinno
- Department of Pediatrics, Hiroshima General Hospital of West Japan Railway Company, Hiroshima, Japan.
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Shimada H, Kihara M, Kosaka S, Ikeda H, Kawabata K, Tsutada T, Miki T. Comparison of SSR and QSART in early diabetic neuropathy--the value of length-dependent pattern in QSART. Auton Neurosci 2001; 92:72-5. [PMID: 11570706 DOI: 10.1016/s1566-0702(01)00287-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We evaluated postganglionic sympathetic function using the sympathetic skin response (SSR) and quantitative sudomotor axon reflex test (QSART) on the feet of 31 patients with early diabetic neuropathy and 20 age-matched normal controls. The amplitude of SSR and the sweat volume of QSART were significantly decreased in the diabetic patients. We evaluated the sensitivity of the tests in detecting autonomic failure. Out of 31 patients, 14 (45%) had abnormal SSR (14 absent; 17 present), while 16 of 31 patients (52%) had abnormal QSART (1 absent; 5 absolutely reduced and 10 showed a length-dependent pattern of reduction). More important than differences in sensitivity is the specificity of QSART, which specifically evaluates the postganglionic axon (instead of polysynaptic pathways in SSR) and provides quantitative data on the severity and pattern of autonomic deficit. In normal controls under 65 years of age, there was a significant correlation between the amplitude of SSR and the sweat volume of QSART. However, there was no significant relationship between these in diabetic patients. These results suggest that QSART can evaluate early diabetic neuropathy more precisely than SSR.
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Affiliation(s)
- H Shimada
- Department of Geriatrics and Neurology, Osaka City University Medical School, Japan.
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37
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Kihara M, Mitsui Y, Shioyama M, Hasegawa T, Takahashi M, Takakura S, Minoura K, Kawamura I. Effect of zenarestat, an aldose reductase inhibitor, on endoneurial blood flow in experimental diabetic neuropathy of rat. Neurosci Lett 2001; 310:81-4. [PMID: 11585572 DOI: 10.1016/s0304-3940(01)02052-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The effects of zenarestat, an aldose reductase inhibitor, on endoneurial blood flow (NBF) were explored in streptozotocin-induced diabetic rats. Rats were maintained on a diet of containing 0.09% zenarestat for 8 weeks, then NBF in the sciatic nerve was measured using microelectrode hydrogen polarography. NBF in the diabetic control rats was significantly lower than values in age-matched control rats, however, NBF was not significantly altered in diabetic rats treated with zenarestat. Direct application of nitric oxide synthase inhibitor, NG-nitro-L-arginine, did not affect NBF in diabetic control rats, whereas this application significantly reduced NBF both in age-matched control and zenarestat treated diabetic rats. Considerable levels of zenarestat were confirmed in the sciatic nerve in the drug treated rats. These data suggest that aldose reductase, such as zenarestat, might restore or prevent the alteration of endoneurial blood flow resulting from an impairment of nitric oxide function.
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Affiliation(s)
- M Kihara
- Department of Neurology, Kinki University, School of Medicine, Ohno-Higashi, Osaka-Sayama, Osaka 589, Japan
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38
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Abstract
A case of neurofibromatosis type 1 (NF1) manifesting Wallenberg's syndrome and fusiform aneurysm of the basilar artery is reported. The patient suddenly developed dysarthria, walking difficulty and sensory disturbance. Neurological examination suggested Wallenberg's syndrome and MR imaging confirmed an ischemic lesion at the left lateral medulla oblongata. Cerebral angiography revealed a fusiform aneurysm at the middle portion of the basilar artery. However, there was no occlusive change in either the posterior inferior cerebellar artery or the vertebral artery. The clinical and radiological features are discussed together with a review of NF1 cases with intracranial aneurysms in the literature.
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Affiliation(s)
- Y Mitsui
- Department of Neurology, Kinki University School of Medicine, Osaka-Sayama, Osaka
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39
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Tomita N, Kanamori H, Fujita H, Maruta A, Naitoh A, Nakamura S, Ota Y, Nozue N, Kihara M, Ishigatsubo Y. Granulomatous tubulointerstitial nephritis induced by all-trans retinoic acid. Anticancer Drugs 2001; 12:677-80. [PMID: 11604554 DOI: 10.1097/00001813-200109000-00005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We report the first case of granulomatous tubulointerstitial nephritis induced by all-trans retinoic acid (ATRA) in a patient with acute promyelocytic leukemia (APL). Acute renal failure during treatment with ATRA has been previously reported as a part of an ATRA syndrome or a thrombotic complication of a hypercoagulable state. This case indicates an alternative mechanism of acute renal failure occurring during ATRA therapy.
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Affiliation(s)
- N Tomita
- Department of Hematology , Fujieda Municipal General Hospital, Shizuoka, 426-8677, Japan.
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40
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Kihara M, Yokomise H, Yamauchi A, Irie A, Matsusaka K, Miyauchi A. Spontaneous rupture of a parathyroid adenoma presenting as a massive cervical hemorrhage: report of a case. Surg Today 2001; 31:222-4. [PMID: 11318124 DOI: 10.1007/s005950170172] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report an unusual case of spontaneous rupture of a parathyroid adenoma causing cervical hemorrhage. A 60-year-old woman presented to our hospital after the sudden development of extensive ecchymosis of her neck and upper anterior chest wall. Computed tomography (CT) scanning revealed a hematoma in the left retrotracheal space, and laboratory examinations revealed significant hypercalcemia, hypophosphatemia, and a high level of intact parathyroid hormone. Primary hyperparathyroidism was diagnosed, but it was not until the hematoma had subsided, 4 months after her initial presentation, that a parathyroid adenoma was revealed by CT. An operation was performed, and a parathyroid adenoma with hemosiderin deposition was histologically diagnosed. Although this phenomenon is unusual, all endocrine surgeons should be well aware of the possibility of its occurrence.
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Affiliation(s)
- M Kihara
- Second Department of Surgery, Kagawa Medical University, Kita-gun, Japan
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41
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Abstract
The methanol extracts of leaves, stem and root barks of Lithocarpus celebicus showed a broad spectrum of antibacterial activity which was increased on fractionation (petrol, dichloromethane, ethylacetate), particularly in the ethyl acetate fraction of the stem bark and petrol fraction of the root bark. None of the extractives was active against tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B., Lae, Papua New Guinea.
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42
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Abstract
The ethanol extracts of Bidens pilosa (whole plant), Bischofia javanica (leaves), Elmerillia papuana (root bark) and Sigesbekia orientalis (whole plant) were partitioned (petrol, dichloromethane, ethyl acetate). The crude ethanolic extracts and all the obtained fractions showed a broad spectrum of antibacterial activity, the ethyl acetate fractions and the petrol fraction of E. papuana being the most effective. No activity was observed against the tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B. Lae, Papua New Guinea.
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43
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Kihara M, Sakata T. Influences of incubation temperature and various saccharides on the production of organic acids and gases by gut microbes of rainbow trout Oncorhynchus mykiss in a micro-scale batch culture. J Comp Physiol B 2001; 171:441-7. [PMID: 11585255 DOI: 10.1007/s003600100190] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We studied the influence of incubation temperature and additional saccharides on the metabolism of hindgut microbes of the rainbow trout Oncorhynchus mykiss in a 50 microl-scale batch culture system. Intestinal contents of rainbow trout reared at 15 degrees C were incubated with glucose, lactosucrose, sodium alginate or colloidal chitin (each 10 g/l) at 15 degrees C or 25 degrees C for 12 h. Levels of organic acids at 0 h and 12 h of incubation were quantified with HPLC. We also monitored gas release from these cultures during incubation. The main product was iso-butyric acid, except for the cultures with colloidal chitin where no net production of organic acids was observed. We detected higher levels of iso-butyric acid in cultures with lactosucrose than in the other cultures. Net production of this acid was less in cultures with colloidal chitin than in blank cultures. The volume of released gas was larger when incubated at 25 degrees C than at 15 degrees C. Cultures with colloidal chitin released more gas than blank cultures when they were incubated at 15 degrees C. Cultures with sodium alginate released less gas than blank cultures irrespective of incubation temperature. These results indicate that the hindgut microbes of this carnivorous fish mainly produce branched-chain fatty acids, very likely by microbial digestion of nitrogenous materials rather than saccharides. However, additional saccharides affected production of branched-chain fatty acids. The influence of incubation temperature in the present study also suggested that the environmental temperature of host fish should affect microbial digestion in the fish gut.
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Affiliation(s)
- M Kihara
- Central Reseach Institute, Maruha Corporation, Tsukuba, Japan.
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44
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Abstract
The methanol extracts of Clematis papuasica leaves and stem bark and of Nauclea obversifolia leaves, stem and root barks showed awide spectrum of antibacterial activity which was increased on fractionation (petrol, dichloromethane, ethyl acetate), the ethyl acetate fractions being in all cases the most effective. None of the extractives was active against tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, Private Mail Bag, Lae, Papua New Guinea.
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45
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Abstract
The methanol extracts of leaves, flowers, stem and root barks of Cassia alata showed a broad spectrum of antibacterial activity. The activity was increased on fractionation (petrol, dichloromethane, ethyl acetate), the dichloromethane fraction of the flower extract being the most effective. No activity was shown against tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology, P.M.B., Lae, Papua New Guinea.
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46
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Abstract
The methanol extracts of leaves, root and stem barks of Horsfieldia helwigii and Melia azedarach showed a broad spectrum of antibacterial activity. The activity was increased on fractionation (petrol, dichloromethane, ethyl acetate), particularly in the petrol fraction of the leaves of H. helwigii and dichlorometane fraction of the stem bark of M. azedarach. No activity was shown against tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology P.M.B., Lae, Papua New Guinea.
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47
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Abstract
The methanol extracts of Picrasma javanica, leaves, seeds, stem and root barks were partitioned (petrol, dichloromethane, ethyl acetate, butanol). All obtained extracts and fractions showed a broad spectrum of antibacterial activity, while none was active against the tested moulds.
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Affiliation(s)
- M R Khan
- Department of Applied Sciences, Papua New Guinea University of Technology P.M.B., Lae, Papua New Guinea.
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48
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Kihara MO, Kramer JS, Bain D, Kihara M, Mandel J. Knowledge of and attitudes toward the pill: results of a national survey in Japan. Fam Plann Perspect 2001; 33:123-7. [PMID: 11407435] [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] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
CONTEXT After decades of debate, the oral contraceptive pill was legalized in Japan in June 1999. Because the pill had been unavailable up until then, little is known about the public's knowledge about, attitudes toward and intentions to use the pill. METHODS In a nationwide probability sample, 630 women and men were interviewed in their homes in March 1999. Respondents were asked a range of questions to gauge their knowledge about and attitudes toward the pill. RESULTS Most respondents (79%) could identify both the name and purpose of the birth control pill. Roughly the same proportion of respondents held an overall positive impression (44%) as held a negative impression (42%) of the pill, and 14% were undecided about the method. The pill's high level of effectiveness in pregnancy prevention was the most common reason for having a favorable impression of it (47%). Women were more concerned about side effects than were men, and they also knew more about the pill's potential side effects than did men. Only 12% of respondents said they intended to use the pill if it were approved. Roughly one-quarter (23-26%) did not correctly identify the pill's inability to protect against HIV and other sexually transmitted diseases (STDs). CONCLUSIONS Legalization of oral contraceptives in Japan has led to an urgent need to educate both men and women on the inability of the pill to protect against STDs, including HIV Policymakers and providers need to recognize the importance of encouraging dual method use in Japan.
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Affiliation(s)
- M O Kihara
- Center for AIDS Prevention Studies (CAPS), University of California, San Francisco, USA
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49
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Umeda T, Kihara M, Hashimoto S, Ichikawa S, Kamakura M, Shimamoto T. [Characteristics of heterosexually acquired AIDS in Japan. An inter-country comparison using AIDS Surveillance data]. Nihon Koshu Eisei Zasshi 2001; 48:200-8. [PMID: 11321787] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVES To identify epidemiological characteristics of heterosexually acquired AIDS in Japan, with emphasis on potential influence on future trends. METHODS National AIDS Surveillance data in Japan were compared with those in the UK and US, where detailed information is available from well-established surveillance procedures. Data on AIDS cases diagnosed until the end of 1996, particularly those acquired heterosexually, were analyzed by year of diagnosis, gender and age group. RESULTS The number of heterosexually acquired AIDS cases in Japan has continued to increase, while those in the UK and US leveled out or decreased recently. The increase during a two-year period after reaching a certain number of cases per year was found to be 2.3-fold in Japanese, 2.4-fold in UK whites and 5-fold in US whites. The male to female ratio (M/F) for heterosexually acquired AIDS was 6.3 among Japanese, while the ratio was 1.1 and 0.5 in the UK and US, respectively. The age distribution at AIDS diagnosis demonstrated a peak from 35 to 54 years of age among Japanese males, as compared to 30 to 34 among males in the UK and the US. No significant difference was apparent in the age distribution among females in the three countries. CONCLUSIONS The relatively small number of AIDS cases in Japan is attributable to the late introduction of HIV and the limited chance of heterosexual transmission from homosexual/bisexual men and injecting drug users. In addition, transmission has probably most often occurred between middle-aged Japanese males and non-Japanese females. As there is a growing risk of HIV infection among Japanese females and young Japanese males, new prevention strategies targeting these groups are urgently required.
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Affiliation(s)
- T Umeda
- Department of Health and Welfare, Kobe City Office
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50
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Kihara M, Minamino T, Yamaguchi S, Macnab RM. Intergenic suppression between the flagellar MS ring protein FliF of Salmonella and FlhA, a membrane component of its export apparatus. J Bacteriol 2001; 183:1655-62. [PMID: 11160096 PMCID: PMC95050 DOI: 10.1128/jb.183.5.1655-1662.2001] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2000] [Accepted: 12/06/2000] [Indexed: 11/20/2022] Open
Abstract
The MS ring of the flagellar basal body of Salmonella is an integral membrane structure consisting of about 26 subunits of a 61-kDa protein, FliF. Out of many nonflagellate fliF mutants tested, three gave rise to intergenic suppressors in flagellar region II. The pseudorevertants swarmed, though poorly; this partial recovery of motile function was shown to be due to partial recovery of export function and flagellar assembly. The three parental mutants were all found to carry the same mutation, a six-base deletion corresponding to loss of Ala-174 and Ser-175 in the predicted periplasmic domain of the FliF protein. The 19 intergenic suppressors identified all lay in flhA, and they consisted of 10 independent examples at the nucleotide level or 9 at the amino acid level. Since two of the nine corresponded to different substitutions at the same amino acid position, only eight positions in the FlhA protein have given rise to suppressors. Thus, FliF-FlhA intergenic suppression is a fairly rare event. FlhA is a component of the flagellar protein export apparatus, with an integral membrane domain encompassing the N-terminal half of the sequence and a cytoplasmic C-terminal domain. All of the suppressing mutations lay within the integral membrane domain. These mutations, when placed in a wild-type fliF background, had no mutant phenotype. In the fliF mutant background, mutant FlhA was dominant, yielding a pseudorevertant phenotype. Wild-type FlhA did not exert significant negative dominance in the pseudorevertant background, indicating that it does not compete effectively with mutant FlhA for interaction with mutant FliF. Mutant FliF was partially dominant over wild-type FliF in both the wild-type and second-site FlhA backgrounds. Membrane fractionation experiments indicated that the fliF mutation, though preventing export, was mild enough to permit assembly of the MS ring itself, and also assembly of the cytoplasmic C ring onto the MS ring. The data from this study provide genetic support for a model in which at least the FlhA component of the export apparatus physically interacts with the MS ring within which it is housed.
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Affiliation(s)
- M Kihara
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520-8114, USA
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