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{beta}-Arrestin-1 mediates thyrotropin-enhanced osteoblast differentiation Research Communications
Thyrotropin (TSH) activation of the TSH receptor (TSHR), a 7-transmembrane-spanning receptor (7TMR), may have osteoprotective properties by direct effects on bone. TSHR activation by TSH phosphorylates protein kinases AKT1, p38α, and ERK1/2 in some cells. We found TSH-induced phosphorylation of these kinases in 2 cell lines engineered to express TSHRs, human embryonic kidney HEK-TSHR cells and human osteoblastic U2OS-TSHR cells. In U2OS-TSHR cells, TSH up-regulated pAKT1 (7.1±0.5-fold), p38α (2.9±0.4-fold), and pERK1/2 (3.1±0.2-fold), whereas small molecule TSHR agonist C2 had no or little ...
Source: FASEB Journal - July 30, 2014 Category: Biology Authors: Boutin, A., Eliseeva, E., Gershengorn, M. C., Neumann, S. Tags: Research Communications Source Type: research

EphB2 contributes to human naive B-cell activation and is regulated by miR-185 Research Communications
In this study, the expression of EphB2 on B cells was tested by Western blot, and the roles of EphB2 in B-cell proliferation, cytokine secretion, and immunoglobulin (Ig) production were evaluated using EphB2 siRNA interference in human B cells from healthy volunteers. Our study revealed that EphB2 was distributed on naive B cells and was up-regulated on activated B cells. Moreover, B-cell proliferation (decreased by 22%, P<0.05), TNF-α secretion (decreased by 40%, P<0.01) and IgG production (decreased by 26%, P < 0.05) were depressed concordantly with the down-regulated EphB2 expression. Subsequently, we scr...
Source: FASEB Journal - July 30, 2014 Category: Biology Authors: Yu, M., Liang, W., Wen, S., Zhao, T., Zhu, M.-X., Li, H.-H., Long, Q., Wang, M., Cheng, X., Liao, Y.-H., Yuan, J. Tags: Research Communications Source Type: research

Opiorphin is a master regulator of the hypoxic response in corporal smooth muscle cells Research Communications
Men with sickle cell disease (SCD) risk developing priapism. Recognizing that SCD is a disease of hypoxia, we investigated the effect of hypoxia on gene expression in corporal smooth muscle (CSM) cells. Rat CSM cells in vitro were treated with CoCl2 or low oxygen tension to mimic hypoxia. Hypoxic conditions increased expression of genes previously associated with priapism in animal models. Variable coding sequence a1 (Vcsa1; the rat opiorphin homologue, sialorphin), hypoxia-inducible factor 1a (Hif-1a), and A2B adenosine receptor (a2br) were increased by 10-, 4-, and 6-fold, respectively, by treatment with CoCl2, whereas l...
Source: FASEB Journal - July 30, 2014 Category: Biology Authors: Fu, S., Tar, M. T., Melman, A., Davies, K. P. Tags: Research Communications Source Type: research

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