Author Tone, Atsuhito| Shikata, Kenichi| Makino, Hirofumi|
Published Date 2007-05-01
Publication Title 岡山医学会雑誌
Volume volume119
Issue issue1
Content Type Journal Article
Author Sasaki, Motofumi| Shikata, Kenichi| Makino, Hirofumi|
Published Date 2008-01-04
Publication Title 岡山医学会雑誌
Volume volume119
Issue issue3
Content Type Journal Article
Author Kataoka, Hitomi| Shikata, Kenichi| Sasaki, Motofumi| Makino, Hirofumi|
Published Date 2008-08-01
Publication Title 岡山医学会雑誌
Volume volume120
Issue issue2
Content Type Journal Article
Author 肥田 和之| 和田 淳| 江口 潤| Zhang Hong| 馬場 雅子| 清田 綾| 橋本 泉| 岡田 達夫| 安原 章浩| 中司 敦子| 赤木 滋| 四方 賢一| 宝来 真志| 二見 淳一郎| 渡辺 英二郎| 松木 泰| 平松 隆司| 槇野 博史| Yashpal S. Kanwar|
Published Date 2007-01-04
Publication Title 岡山医学会雑誌
Volume volume118
Issue issue3
Content Type Journal Article
Author 岡田 震一| 四方 賢一| 槇野 博史|
Published Date 2005-05-20
Publication Title 岡山医学会雑誌
Volume volume117
Issue issue1
Content Type Journal Article
JaLCDOI 10.18926/AMO/30431
FullText URL fulltext.pdf
Author Yamasaki, Yasushi| Makino, Hirofumi| Hironaka, Kazue| Hayashi, Yoshikazu| Shikata, Kenichi| Ota, Zensuke|
Abstract

We demonstrated the ultrastructure of rat glomerular basement membrane (GBM) by ultra-high resolution scanning electron microscopy. GBM prepared by sonication methods and conductive-staining could be observed without metal coating at magnifications as high as 400,000 times. The GBM showed an irregular meshwork structure composed of various strands and pores. The width of the strands ranged from 6 to 15 nm, and the diameter of pores ranged from 6 to 50 nm. The present study confirmed our molecular sieve theory of the basement membrane.

Keywords glomerular basement membrance ultrastructure ultra-high resolution scanning electron microscopy conductive staining
Amo Type Article
Publication Title Acta Medica Okayama
Published Date 1990-12
Volume volume44
Issue issue6
Publisher Okayama University Medical School
Start Page 333
End Page 335
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
File Version publisher
Refereed True
PubMed ID 2075832
Web of Science KeyUT A1990EP70700009
JaLCDOI 10.18926/AMO/30866
FullText URL fulltext.pdf
Author Ota, Zensuke| Kumagai, Isao| Shikata, Kenichi| Makino, Hirofumi|
Abstract

Sprague-Dawley rats, 6 with aminonucleoside nephrosis and 6 controls, were intravenously injected with human liver ferritin isolated from post mortem liver, and their 24-h urine samples were examined for human ferritin by immunoradiometric assay. In rats with aminonucleoside nephrosis, the amount of excreted ferritin in urine was forty times greater than in control rats. Much more monomeric ferritin was excreted than that of polymeric ferritin. We are the first to have utilized human liver ferritin as a tracer to measure a minor amount of ferritin by a commercially available kit. Our present study seems to indicate a critical role for glomerular basement membrane as a size barrier.

Keywords glomerular permeabillity size barrier human liver ferritin immunoradiometricassay
Amo Type Article
Publication Title Acta Medica Okayama
Published Date 1989-12
Volume volume43
Issue issue6
Publisher Okayama University Medical School
Start Page 363
End Page 365
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
File Version publisher
Refereed True
PubMed ID 2624144
Web of Science KeyUT A1989CG27400008
JaLCDOI 10.18926/AMO/31126
FullText URL fulltext.pdf
Author Morioka, Shigeru| Makino, Hirofumi| Shikata, Kenichi| Ota, Zensuke|
Abstract

To investigate the role of vitronectin in the progression of diabetic nephropathy, plasma concentrations of vitronectin were measured by enzyme-linked immunosorbent assay in patients with diabetes mellitus and compared with normal control subjects. In diabetic patients with normoalbuminuria and microalbuminuria, plasma concentrations of vitronectin were significantly higher than those of control subjects. Plasma concentrations of vitronectin in diabetic patients with chronic renal failure were significantly lower than those with normal renal function. There was a significant positive correlation between plasma concentration of vitronectin and blood platelet counts. In the early stage of diabetic nephropathy, vitronectin may be increased caused by synthesis from activated platelets. With progression of diabetic nephropathy, plasma vitronectin may be decreased because of accumulation in sclerotic glomeruli and arteriosclerotic lesions. In conclusion, the plasma concentration of vitronectin appears to be an important marker for the progression of diabetic nephropathy.

Keywords vitronectin(S-protein) diabetic nephropathy hypertension chronic renal failure enzyme-linked immunosorbent assay (ELISA)
Amo Type Article
Publication Title Acta Medica Okayama
Published Date 1994-06
Volume volume48
Issue issue3
Publisher Okayama University Medical School
Start Page 137
End Page 142
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
File Version publisher
Refereed True
PubMed ID 7524268
Web of Science KeyUT A1994NV04300004
JaLCDOI 10.18926/AMO/31556
FullText URL fulltext.pdf
Author Ota, Kosuke| Ota, Zensuke| Shikata, Kenichi| Makino, Hirofumi|
Abstract

In order to clarify the mechanism of proteinuria in diabetic nephropathy, ultrastructural changes of the glomerular basement membrane (GBM) in patients with diabetic nephropathy were examined by electron microscopy using our newly devised "tissue negative staining method". The normal human GBM showed a fine meshwork structure consisting of fibrils forming the small pores. The diameter of these pores was slightly smaller than that of human albumin molecules. The GBM in patients with diabetic nephropathy showed irregular thickening. At higher magnification, hitherto unknown cavities and tunnel structures, which were not seen in normal controls, were observed in the thickened GBM. In some portions, these cavities presented a honeycomb-like appearance. The diameters of the cavities and tunnels were far larger than the dimensions of albumin molecules. These enlarged structures are believed to allow serum protein molecules to pass through the GBM from the capillary lumen to the urinary space. These results suggest that the cause of massive proteinuria in diabetic nephropathy is the disruption of the size barrier of the GBM.

Keywords glomerular basement membrane diabetic nephropathy tissue negative staining nephrotic syndrome ultrastructure
Amo Type Article
Publication Title Acta Medica Okayama
Published Date 1993-08
Volume volume47
Issue issue4
Publisher Okayama University Medical School
Start Page 267
End Page 272
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
File Version publisher
Refereed True
PubMed ID 7692703
Web of Science KeyUT A1993LV73800008
JaLCDOI 10.18926/AMO/32632
FullText URL fulltext.pdf
Author Ota, Zensuke| Shikata, Kenichi| Ota, Kosuke|
Abstract

We developed a "tissue negative staining method" to observe the molecular-level ultrastructure in situ in any portion of the ultrathin sections routinely prepared for electron microscopy. This method was used in electron microscopy of the glomerular basement membranes (GBM). The GBM in patients with nephrotic syndrome was discovered to possess a tunnel structure, designated as "nephrotic tunnel", with lumen large enough to allow free passage of protein molecules. This tunnel seemed to be involved in the etiology of nephrotic syndrome. This new method appears to be applicable to a variety of purposes in biological studies.

Keywords mechanism proteinuria nephrotic syndrome electron microscopy negative staining
Amo Type Article
Publication Title Acta Medica Okayama
Published Date 1992-12
Volume volume46
Issue issue6
Publisher Okayama University Medical School
Start Page 483
End Page 487
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
File Version publisher
Refereed True
PubMed ID 1485544
Web of Science KeyUT A1992KE49600012
JaLCDOI 10.18926/AMO/32856
FullText URL fulltext.pdf
Author Sumiyoshi, Kazuko| Kawata, Chieko| Shikata, Kenichi| Makino, Hirofumi|
Abstract

The aim of this study was to clarify the factors influencing the dietary behavior of patients with diabetic nephropathy. One hundred twenty-two patients with type 2 diabetes were recruited from the outpatients of Okayama University Hospital in Okayama, Japan. We performed a cross-sectional study using a questionnaire including 206 items among 18 categories as follows:background factors, coping behavior (coping scale), degree of uncertainty in illness (uncertainty scale), and dietary behavior. The data were analyzed by correlation analysis, t-test, one-way analysis of variance, Pearson correlation analysis, and multiple regression analysis. We found that those patients with microalbuminuria alone tended to recognize more mild about their kidney status than those with macroalbuminuria and chronic renal failure. We also found that common factors influencing the dietary behavior of diabetic patients with and without nephropathy are as follows:1. coping with the problem (beta0.342, p0.01);2. anxiety about prognosis (beta0.344, p0.01);3. sex (beta0.234, p0.05);4. uncertainty regarding treatment (beta0.377, p0.01);5. negative coping (beta0.354, p0.01);and 6. employment status (beta0.367, p0.01). Coping and uncertainty in illness had a significant relation to positive support and lack of support. To maintain appropriate dietary behavior in diabetic patients, medical staff need to determine what the social supports are important for the patient, and also to ensure good communication among healthcare personnel as well as positive support for patients and families.

Keywords diabetic nephropathy dietary behavior coping uncertainty in illness social support
Amo Type Original Article
Publication Title Acta Medica Okayama
Published Date 2010-02
Volume volume64
Issue issue1
Publisher Okayama University Medical School
Start Page 39
End Page 47
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
File Version publisher
Refereed True
PubMed ID 20200583
Web of Science KeyUT 000274868300006
JaLCDOI 10.18926/AMO/40013
FullText URL fulltext.pdf
Author Miyatake, Nobuyuki| Shikata, Kenichi| Makino, Hirofumi| Numata, Takeyuki|
Abstract We investigated the link between renal function as evaluated by estimated glomerular filtration rate (eGFR) and metabolic syndrome in Japanese. A total of 11,711 Japanese subjects, aged 20-79 years, were recruited in a cross-sectional clinical investigation. From this group, we further investigated the data on 1,576 subjects. eGFR was calculated using serum creatinine (Cr), age and sex. The diagnosis of metabolic syndrome was based on the Japanese criteria. In the first analysis, 288 men (7.8%) and 498 women (6.2%) were diagnosed with reduced eGFR (<60ml/min). eGFR was not correlated with anthropometric, body composition parameters in either sex. In the second analysis, in subjects without medications, 132 men (20.8%) and 15 women (1.6%) were diagnosed with metabolic syndrome. eGFR was lower in men with abdominal obesity and in women with hypertension was than in those without. Among Japanese not taking medications, lower eGFR may be a characteristic of men with abdominal obesity and of women with hypertension.
Keywords metabolic syndrome estimated glomerular filtration rate (eGFR) abdominal circumference
Amo Type Original Article
Publication Title Acta Medica Okayama
Published Date 2010-06
Volume volume64
Issue issue3
Publisher Okayama University Medical School
Start Page 203
End Page 208
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
Copyright Holders Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 20596132
Web of Science KeyUT 000279094300007
JaLCDOI 10.18926/AMO/40510
FullText URL 64_5_339.pdf
Author Miyatake, Nobuyuki| Shikata, Kenichi| Makino, Hirofumi| Numata, Takeyuki|
Abstract The link between changes in a subject's metabolic syndrome components and her estimated glomerular filtration rate (eGFR) was evaluated in healthy Japanese women. We used data for 53 Japanese women (46.0±10.9 years) with a 1-year follow up. eGFR was defined by a new equation developed for Japan. There were no significant relationships between eGFR and clinical parameters at baseline. Subjects were given advice for dietary and lifestyle improvement. At the 1-year follow up, eGFR was significantly increased. In addition, changes in eGFR were weakly correlated with systolic blood pressure(r=-0.306, p=0.0260). A decrease in systolic blood pressure may be associated with improving eGFR in Japanese women.
Keywords systolic blood pressure estimated glomerular filtration rate (eGFR) metabolic syndrome lifestyle modification
Amo Type Short Communication
Publication Title Acta Medica Okayama
Published Date 2010-10
Volume volume64
Issue issue5
Publisher Okayama University Medical School
Start Page 339
End Page 343
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
Copyright Holders CopyrightⒸ 2010 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 20975768
Web of Science KeyUT 000283563300010
JaLCDOI 10.18926/AMO/45266
FullText URL 65_2_81.pdf
Author Sasaki, Motofumi| Shikata, Kenichi| Okada, Shinichi| Miyamoto, Satoshi| Nishishita, Shingo| Usui Kataoka, Hitomi| Sato, Chikage| Wada, Jun| Ogawa, Daisuke| Makino, Hirofumi|
Abstract Glomerular hyperfiltration is a common pathway leading to glomerulosclerosis in various kinds of kidney diseases. The 5/6 renal ablation is an established experimental animal model for glomerular hyperfiltration. On the other hand, low-grade inflammation is also a common mechanism for the progression of kidney diseases including diabetic nephropathy and atherosclerosis. Here we analyzed the gene expression profile in the remnant kidney tissues of 5/6 nephrectomized mice using a DNA microarray system and compared it with that of sham-operated control mice. The 5/6 nephrectomized mice showed glomerular hypertrophy and an increase in the extracellular matrix in the glomeruli. DNA microarray analysis indicated the up-regulated expression of various kinds of genes related to the inflammatory process in remnant kidneys. We confirmed the up-regulated expression of platelet factor-4, and monocyte chemoattractant protein-1, 2, and 5 in remnant kidneys by RT-PCR. The current results suggest that the inflammatory process is involved in the progression of glomerulosclerosis and is a common pathway of the pathogenesis of kidney disease.
Keywords kidney inflammation chemokine
Amo Type Original Article
Publication Title Acta Medica Okayama
Published Date 2011-04
Volume volume65
Issue issue2
Publisher Okayama University Medical School
Start Page 81
End Page 89
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
Copyright Holders CopyrightⒸ 2011 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 21519365
Web of Science KeyUT 000289818800003
JaLCDOI 10.18926/AMO/45272
FullText URL 65_2_129.pdf
Author Toyota, Noriko| Ogawa, Daisuke| Ishii, Keita| Hirata, Kyoji| Wada, Jun| Shikata, Kenichi| Makino, Hirofumi|
Abstract A 62-year-old woman with a history of poorly controlled type 2 diabetes mellitus was admitted to our hospital with a 3-week history of mild fever, vomiting, and anorexia. Abdominal computed tomography (CT) showed bilateral hydronephrosis and gas accumulation in the urinary bladder wall and left ureter. Laboratory tests showed leukocytosis and elevated C-reactive protein level. Urine culture showed heavy growth of Escherichia coli. The final diagnosis was emphysematous cystitis. The patient was treated with systemic antibiotics and drainage using a urethral catheter. The clinical and radiographic findings resolved rapidly, and she was discharged from the hospital on day 28. Emphysematous cystitis is a relatively rare urinary tract infection associated with gas formation, and has the potential for a serious outcome if untreated. Early detection by imaging studies such as CT is important in providing prompt treatment and favorable clinical outcome.
Keywords computed tomography diabetes mellitus emphysematous cystitis
Amo Type Case Report
Publication Title Acta Medica Okayama
Published Date 2011-04
Volume volume65
Issue issue2
Publisher Okayama University Medical School
Start Page 129
End Page 133
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
Copyright Holders CopyrightⒸ 2011 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 21519371
Web of Science KeyUT 000289818800009
JaLCDOI 10.18926/AMO/46850
FullText URL 65_4_247.pdf
Author Watanabe, Naomi| Shikata, Kenichi| Shikata, Yasushi| Sarai, Kei| Omori, Kazuyoshi| Kodera, Ryo| Sato, Chikage| Wada, Jun| Makino, Hirofumi|
Abstract Inflammatory processes are involved in the pathogenesis of diabetic nephropathy. The aim of this study was to clarify the role of mitogen-activated protein kinase (MAPK) pathways for induction of intercellular adhesion molecule-1 (ICAM-1) expression in glomerular endothelial cells under diabetic conditions. We examined the expression of ICAM-1 in the kidneys of experimental diabetic rats. Human glomerular endothelial cells (GE cells) were exposed to normal glucose concentration, high glucose concentration (HG), or high mannitol concentration (HM), and then the expression of the ICAM-1 protein and the phosphorylation of the 3 subfamilies of mitogen-activated protein kinase (MAPK) were determined using Western blot analysis. Next, to evaluate the involvement of MAPKs in HG- or HM-induced ICAM-1 expression, we preincubated GE cells with the inhibitors for ERK, p38 or JNK 1h prior to the application of glucose or mannitol. Expression of ICAM-1 was increased in the glomeruli of diabetic rats. Both HG and HM induced ICAM-1 expression and phosphorylation of ERK1/2, p38 and JNK in GE cells. Expression of ICAM-1 was significantly attenuated by inhibitors of ERK, p38 and JNK. We conclude that activation of ERK1/2, p38 and JNK cascades may be involved in ICAM-1 expression in glomerular endothelial cells under diabetic conditions.
Keywords diabetic nephropathy ICAM-1 ERK p38 MAPK JNK
Amo Type Original Article
Publication Title Acta Medica Okayama
Published Date 2011-08
Volume volume65
Issue issue4
Publisher Okayama University Medical School
Start Page 247
End Page 257
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
Copyright Holders CopyrightⒸ 2011 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 21860531
Web of Science KeyUT 000294236700005
Author Shikata, Kenichi|
Published Date 2011-12-01
Publication Title 岡山医学会雑誌
Volume volume123
Issue issue3
Content Type Journal Article
JaLCDOI 10.18926/AMO/47261
FullText URL 65_6_363.pdf
Author Miyatake, Nobuyuki| Shikata, Kenichi| Makino, Hirofumi| Numata, Takeyuki|
Abstract The link between changes in a subject's metabolic syndrome components and his estimated glomerular filtration rate (eGFR) was evaluated in healthy Japanese men. We used data from 120 Japanese men (45.5±8.4 years) with a 1-year follow up. eGFR was defined by a new equation developed for Japan. There were no significant differences in eGFR between men with and without metabolic syndrome components at baseline. Subjects were given advice for dietary and lifestyle improvement. At the 1-year follow up, almost all metabolic syndrome components were significantly improved. However, eGFR was significantly decreased. The changes in eGFR were weakly correlated with abdominal circumference (r=-0.232, p=0.0106). A decrease in abdominal circumference may be associated with improving eGFR in Japanese men.
Keywords abdominal circumference estimated glomerular filtration rate (eGFR) metabolic syndrome lifestyle modification
Amo Type Original Article
Publication Title Acta Medica Okayama
Published Date 2011-12
Volume volume65
Issue issue6
Publisher Okayama University Medical School
Start Page 363
End Page 367
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language English
Copyright Holders CopyrightⒸ 2011 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 22189476
Web of Science KeyUT 000298516900002
Author Nagase, Ryo| Kajitani, Nobuo| Shikata, Kenichi| Ogawa, Daisuke| Kodera, Ryo| Okada, Shinichi| Kido, Yuichi| Makino, Hirofumi|
Published Date 2012-10
Publication Title Clinical and Experimental Nephrology
Volume volume16
Issue issue5
Content Type Journal Article