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Articles by H Abe
Total Records ( 3 ) for H Abe
  H Hirasawa , A Tomidokoro , M Araie , S Konno , H Saito , A Iwase , M Shirakashi , H Abe , S Ohkubo , K Sugiyama , T Ootani , S Kishi , K Matsushita , N Maeda , M Hangai and N. Yoshimura
 

Objectives  To evaluate the peripapillary distribution of retinal nerve fiber layer thickness (RNFLT) in normal eyes using spectral-domain optical coherence tomography and to study potentially related factors.

Methods  In 7 institutes in Japan, RNFLT in 7 concentric peripapillary circles with diameters ranging from 2.2 to 4.0 mm were measured using spectral-domain optical coherence tomography in 251 ophthalmologically normal subjects. Multiple regression analysis for the association of RNFLT with sex, age, axial length, and disc area was performed.

Results  Retinal nerve fiber layer thickness decreased linearly from 125 to 89 µm as the measurement diameter increased (P < .001, mixed linear model). Retinal nerve fiber layer thickness correlated with age in all diameters (partial correlation coefficient [PCC] = –0.40 to –0.32; P < .001) and negatively correlated with disc area in the 2 innermost circles but positively correlated in the 3 outermost circles (PCC = –0.30 to –0.22 and 0.17 to 0.20; P ≤ .005). Sex and axial length did not correlate with RNFLT (P > .08). The decay slope was smallest in the temporal and largest in the nasal and inferior quadrants (P < .001); positively correlated with disc area (PCC = 0.13 to 0.51; P ≤ .04); and negatively correlated with RNFLT (PCC = –0.51 to –0.15; P ≤ .01).

Conclusions  In normal Japanese eyes, RNFLT significantly correlated with age and disc area, but not with sex or axial length. Retinal nerve fiber layer thickness decreased linearly as the measurement diameter increased. The decay slope of RNFLT was steepest in the nasal and inferior quadrants and steeper in eyes with increased RNFLT or smaller optic discs.

  N Kimura , S Tsunoda , Y Iuchi , H Abe , K Totsukawa and J. Fujii
 

Oxidative stress characterized by elevated reactive oxygen species is a well-known cause of developmental arrest and cellular fragmentation in the development of in vitro-produced embryos. To investigate the effects of intrinsic oxidative stress on the early development of embryos, oocytes from superoxide dismutase 1 (SOD1)-deficient mice resulting from in vitro fertilization, followed by culture for 4 days, were examined. Development of all embryos from SOD1-deficient oocytes was arrested at the 2-cell stage under conventional culture conditions with atmospheric oxygen (20% O2). Significantly higher levels of superoxide were detected in SOD1-deficinet embryos cultured under 20% O2 using dihydroethidium. Among treatments with antioxidants, only hypoxic culture with 1% O2 negated the 2-cell arrest and advanced the development of the embryos with efficacy similar to that in wild-type embryos. Mitochondrial function was investigated because its malfunction was a suspected cause of 2-cell arrest. However, respiratory activity, ATP content and mitochondrial membrane potential in the 2-cell embryos were not markedly affected by culture with 20% O2. When embryos from SOD1-deficient oocytes were first developed to the 4-cell stage under 1% O2 culture and were then transferred to 20% O2, most of them developed to the morula stage but underwent total degeneration thereafter. Thus, oxidative stress was found to damage embryos differentially, depending on the developmental stage. These results suggest that embryos derived from SOD1-deficient mouse oocytes are an ideal model to investigate intrinsic oxidative stress-induced developmental abnormality.

  S Kawaoka , N Hayashi , Y Suzuki , H Abe , S Sugano , Y Tomari , T Shimada and S. Katsuma
 

Genetic studies and large-scale sequencing experiments have revealed that the PIWI subfamily proteins and PIWI-interacting RNAs (piRNAs) play an important role in germ line development and transposon control. Biochemical studies in vitro have greatly contributed to the understanding of small interfering RNA (siRNA) and microRNA (miRNA) pathways. However, in vitro analyses of the piRNA pathway have been thus far quite challenging, because their expression is largely restricted to the germ line. Here we report that Bombyx mori ovary-derived cultured cell line, BmN4, endogenously expresses two PIWI subfamily proteins, silkworm Piwi (Siwi) and Ago3 (BmAgo3), and piRNAs associated with them. Siwi-bound piRNAs have a strong bias for uridine at their 5' end and BmAgo3-bound piRNAs are enriched for adenine at position 10. In addition, Siwi preferentially binds antisense piRNAs, whereas BmAgo3 binds sense piRNAs. Moreover, we identified many pairs in which Siwi-bound antisense and BmAgo3-bound sense piRNAs are overlapped by precisely 10 nt at their 5' ends. These signatures are known to be important for secondary piRNA biogenesis in other organisms. Taken together, BmN4 is a unique cell line in which both primary and secondary steps of piRNA biogenesis pathways are active. This cell line would provide useful tools for analysis of piRNA biogenesis and function.

 
 
 
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