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Articles by K Joh
Total Records ( 2 ) for K Joh
  N Tsuboi , T Kawamura , K Koike , H Okonogi , K Hirano , A Hamaguchi , Y Miyazaki , M Ogura , K Joh , Y Utsunomiya and T. Hosoya
 

Background and objectives: An early histopathologic predictor of the renal prognosis, before the occurrence of advanced glomerular sclerosis/interstitial fibrosis and/or apparent renal dysfunction, remains to be established in IgA nephropathy (IgAN). This study aimed to determine whether the glomerular density (GD; nonsclerotic glomerular number per renal cortical area) of biopsy specimens obtained at an early stage of IgAN could predict the long-term renal outcome.

Design, setting, participants, & measurements: The predictive value of the factors at biopsy, including the GD, on the renal outcome was retrospectively analyzed for 98 patients who had IgAN with an estimated GFR of ≥60 ml/min per 1.73 m2 at biopsy (87 ml/min per 1.73 m2 on average).

Results: The individual value of GD in biopsy ranged from 1.2 to 8.1/mm2 (i.e., approximately a seven-fold variation), and the GD showed a close inverse correlation with mean glomerular volume. Among the various clinicopathologic factors involved, both a cellular/fibrocellular crescent and the GD were found to be significant predictors of progression in multivariate analyses. A low GD in the biopsy specimens was frequently associated with a steeper slope of the renal function and a synergistically enhanced risk for progression with the presence of cellular/fibrocellular crescent. The renal function, proteinuria, degrees of glomerulosclerosis, and interstitial fibrosis at biopsy were not independent predictors of the prognosis in these patients.

Conclusions: A strong predictive relationship of low GD with progression observed in this study suggests that GD may serve as an early histopathologic marker of long-term renal prognosis in IgAN.

  K Joh , H Yatsuki , K Higashimoto , T Mukai and H. Soejima
 

The Commd1 gene is imprinted in the adult mouse brain and is predominantly expressed from the maternal allele. A paternally expressing imprinted gene, U2af1-rs1, resides in the first intron of Commd1 in an antisense orientation. We found that RNA polymerase II phosphorylated at serine 2 of the carboxyl-terminal domain repeats, a marker of transcription elongation, is enriched on the paternal allele than on the maternal allele in the Commd1 promoter. The Commd1 promoter harbours no allelic differences in DNA methylation and histone modifications. These results strongly suggested that imprinting of Commd1 is generated by interference with paternal Commd1 transcription by the oppositely directed U2af1-rs1 transcription.

 
 
 
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