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Articles by Y. C Huang
Total Records ( 4 ) for Y. C Huang
  J Vikman , H Svensson , Y. C Huang , Y Kang , S. A Andersson , H. Y Gaisano and L. Eliasson
 

Synaptosomal protein of 25 kDa (SNAP-25) is important for Ca2+-dependent fusion of large dense core vesicles (LDCVs) in insulin-secreting cells. Exocytosis is further enhanced by cAMP-increasing agents such as glucagon-like peptide-1 (GLP-1), and this augmentation includes interaction with both PKA and cAMP-GEFII. To investigate the coupling between SNAP-25- and cAMP-dependent stimulation of insulin exocytosis, we have used capacitance measurements, protein-binding assays, and Western blot analysis. In insulin-secreting INS-1 cells overexpressing wild-type SNAP-25 (SNAP-25WT), rapid exocytosis was stimulated more than threefold by cAMP, similar to the situation in nontransfected cells. However, cAMP failed to potentiate rapid exocytosis in INS-1 cells overexpressing a truncated form of SNAP-25 (SNAP-251-197) or Botulinum neurotoxin A (BoNT/A). Close dissection of the exocytotic response revealed that the inability of cAMP to stimulate exocytosis in the presence of a truncated SNAP-25 was confined to the release of primed LDCVs within the readily releasable pool, especially from the immediately releasable pool, whereas cAMP enhanced mobilization of granules from the reserve pool in both SNAP-251-197 (P < 0.01) and SNAP-25WT (P < 0.05) cells. This was supported by hormone release measurements. Augmentation of the immediately releasable pool by cAMP has been suggested to act through the cAMP-GEFII-dependent, PKA-independent pathway. Indeed, we were able to verify an interaction between SNAP-25 with both cAMP-GEFII and RIM2, two proteins involved in the PKA-independent pathway. Thus we hypothesize that SNAP-25 is a necessary partner in the complex mediating cAMP-enhanced rapid exocytosis in insulin-secreting cells.

  K. Y Lu , L. C Ching , K. H Su , Y. B Yu , Y. R Kou , S. H Hsiao , Y. C Huang , C. Y Chen , L. C Cheng , C. C Pan and T. S. Lee
 

Background— In addition to the hematopoietic effect of erythropoietin, increasing evidence suggests that erythropoietin also exerts protective effects for cardiovascular diseases. However, the role of erythropoietin and its underlying mechanism in macrophage foam cell formation are poorly understood.

Methods and Results— Compared with wild-type specimens, erythropoietin was increased in atherosclerotic aortas of apolipoprotein E–deficient (apoE–/–) mice, mainly in the macrophage foam cells of the lesions. Erythropoietin levels in culture medium and macrophages were significantly elevated in response to oxidized low-density lipoprotein in a dose-dependent manner. Furthermore, erythropoietin markedly attenuated lipid accumulation in oxidized low-density lipoprotein–treated macrophages, a result that was due to an increase in cholesterol efflux. Erythropoietin treatment significantly increased ATP-binding cassette transporters (ABC) A1 and ABCG1 mRNA and protein levels without affecting protein expression of scavenger receptors, including scavenger receptor-A, CD36, and scavenger receptor-BI. The upregulation of ABCA1 and ABCG1 by erythropoietin resulted from liver X receptor activation, which was confirmed by its prevention on expression of ABCA1 and ABCG1 after pharmacological or small interfering RNA inhibition of liver X receptor . Moreover, the erythropoietin-mediated attenuation on lipid accumulation was abolished by such inhibition. Finally, reduced lipid accumulation and marked increase in ABCA1 and ABCG1 were demonstrated in erythropoietin-overexpressed macrophages.

Conclusion— Our data suggest that erythropoietin suppresses foam cell formation via the liver X receptor –dependent upregulation of ABCA1 and ABCG1.

  C. C Lan , Y. K Wu , C. H Lee , Y. C Huang , C. Y Huang , Y. H Tsai , S. F Huang and T. C. Y. Tsao
  Objective

The sensitivity of cytologic examination of pleural effusions is variable and not predictive of prognosis. Survivin is an inhibitor of apoptosis that may be a novel diagnostic/prognostic marker of cancers. This study aimed to determine the diagnostic and prognostic value of measuring survivin mRNA levels in pleural effusions.

Methods

Eighty-eight consecutive pleural effusion samples were examined for both cytology and survivin mRNA level. The accuracy of diagnosis and the correlation between survivin mRNA level and survival in malignant pleural effusion (MPE) were determined. Pleural effusions were divided into three groups: Group I, malignancy-associated (n = 44); Group II, inflammatory (n = 27); and Group III, transudative (n = 17).

Results

Survivin mRNA levels in Group I (1.03 ± 0.61, range 0–2.96) were significantly higher than those in Groups II (0.45 ± 0.69, range 0–3.30) and III (0.08 ± 0.22, range 0–0.71) (P < 0.001). Survivin mRNA level was significantly higher in MPE than in non-MPE. The cut-off value for survivin mRNA levels in pleural effusions was 0.074 for the diagnosis of malignancies, with sensitivity, specificity, and positive and negative predictive values of 96%, 45%, 45% and 96%, respectively. Survivin mRNA level in pleural effusions of cancer patients significantly correlated with poor survival.

Conclusions

Survivin mRNA level is significantly higher in MPEs. Over-expression of survivin mRNA correlates with poor prognosis in cancer patients.

  K. C Lang , I. H Lin , H. F Teng , Y. C Huang , C. L Li , K. T Tang and S. L. Chen
 

Oct4 and Nanog are two embryonic stem (ES) cell-specific transcription factors that play critical roles in the maintenance of ES cell pluripotency. In this study, we investigated the effects of Oct4 and Nanog expression on the differentiation state of myogenic cells, which is sustained by a strong positive feedback loop. Oct4 and Nanog, either independently or simultaneously, were overexpressed in C2C12 myoblasts, and the expression of myogenic lineage-specific genes and terminal differentiation was observed by RT-PCR. Overexpression of Oct4 in C2C12 cultures repressed, while exogenous Nanog did not significantly alter C2C12 terminal differentiation. The expression of Pax7 was reduced in all Oct4-overexpressing myoblasts, and we identified a major Oct4-binding site in the Pax7 promoter. Simultaneous expression of Oct4 and Nanog in myoblasts inhibited the formation of myotubes, concomitant with a reduction in the endogenous levels of hallmark myogenic markers. Furthermore, overexpression of Oct4 and Nanog induced the expression of their endogenous counterparts along with the expression of Sox2. Using mammalian two-hybrid assays, we confirmed that Oct4 functions as a transcriptional repressor whereas Nanog functions as a transcriptional activator during muscle terminal differentiation. Importantly, in nonobese diabetic (NOD) severe combined immunodeficiency (SCID) mice, the pluripotency of C2C12 cells was conferred by overexpression of Oct4 and Nanog. These results suggest that Oct4 in cooperation with Nanog strongly suppresses the myogenic differentiation program and promotes pluripotency in myoblasts.

 
 
 
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