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Articles by J. Shen
Total Records ( 3 ) for J. Shen
  J Du , L Chen and J. Shen
 

This study sought to isolate and identify proteins that interact with centromere-associated protein E (CENP-E), provide new clues for exploring the function of CENP-E in cell cycle control and the pathogenesis of tumor. Yeast two-hybrid screen and regular molecular biologic techniques were undertaken to screen human HeLa cDNA library with the kinetochore binding domain of CENP-E. The bait from the C-terminus of CENP-E was created by subcloning methods to find out optimal candidate proteins that interact with the kinetochore binding domain of CENP-E. Eight novel CENP-E interacting proteins including Homo sapiens Fanconi anemia complementation group A (FANCA) were obtained. In yeast two-hybrid assay, the N-terminal 260 amino acids of FANCA were found to be necessary and sufficient for the interaction with the C-terminus of CENP-E. The interaction was confirmed by in vitro glutathione S-transferase pull-down assay and in vivo co-immunoprecipitation assay. Our finding of the interaction of CENP-E with FANCA demonstrates that CENP-E and FANCA may play important roles in the functional regulation of the mitotic checkpoint signal pathway.

  G Hasler , J. W van der Veen , C Grillon , W. C Drevets and J. Shen
  Objective:

Impaired function of the central gamma-aminobutyric acid (GABA) system, which provides the brain's major inhibitory pathways, is thought to play an important role in the pathophysiology of anxiety disorders. The effect of acute psychological stress on the human GABA-ergic system is still unknown, however. The purpose of this study was to determine the effect of acute stress on prefrontal GABA levels.

Method:

A recently developed noninvasive magnetic resonance spectroscopy method was used to measure changes in the GABA concentration of the prefrontal cortex in 10 healthy human subjects during a threat-of-shock condition and during a safe condition (two sessions on different days). The main outcome measure was the mean GABA concentration within a 3x3x2-cm3 voxel selected from the medial prefrontal cortex.

Results:

Prefrontal GABA decreased by approximately 18% in the threat-of-shock condition relative to the safe condition. This reduction was specific to GABA, since the concentrations of N-acetyl-aspartate, choline-containing compounds, and glutamate/glutamine levels obtained in the same spectra did not change significantly.

Conclusions:

This result appeared compatible with evidence from preclinical studies in rodents, which showed rapid presynaptic down-regulation of GABA-ergic neurotransmission in response to acute psychological stress. The molecular mechanism and functional significance of this reduced inhibitory effect of acute psychological stress in relation to impaired GABA-ergic function in anxiety disorders merit further investigation.

  X Wang and J. Shen
 

We study a class of monotone univariate regression estimators. We use B-splines to approximate an underlying regression function and estimate spline coefficients based on grouped data. We investigate asymptotic properties of two monotone estimators: a grouped Brunk estimator and a penalized monotone estimator. These estimators are consistent at the boundary and their mean square errors achieve optimal convergence rates under suitable assumptions of the true regression function. Asymptotic distributions are developed and are shown to be independent of spline degrees and the number of knots. Simulation results and car data illustrate performance of the proposed estimators.

 
 
 
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