Background: Porcine pluripotent stem cells (pPSCs) would provide enormous potential for agriculture and biomedicine. However, authentic pPSCs have not established yet because standards for pPSCs-specific markers and culture conditions are not clear. Therefore, the present study reports comparative pluripotency characteristics in porcine induced pluripotent stem cells (piPSCs) derived from different viral transduction and reprogramming factors [Lenti-iPSCs (OSKM), Lenti-iPSCs (OSKMNL) and Sev-iPSCs (OSKM)]. Methods: Porcine fibroblasts were induced into Lenti-iPSCs (OSKM) and Lenti-iPSCs (OSKMNL) by using Lentiviral vector and Sev-iPSCs (OSKM) by using Sendaiviral vector. Expressions of endogenous or exogenous pluripotency-associated genes, surface marker and in vitro differentiation in between Lenti-piPSCs (OSKM), Lenti-iPSCs (OSKMNL) and Sev-piPSCs (OSKM) were compared. Results: Colonial morphology of Lenti-iPSCs (OSKMNL) closely resembles the naïve mouse embryonic stem cells colony for culture, whereas Sev-iPSCs (OSKM) colony is similar to the primed hESCs. Also, the activity of AP shows a distinct different in piPSCs (AP-positive (+) Lenti-iPSCs (OSKMNL) and Sev-iPSCs (OSKM), but AP-negative (-) LentiiPSCs (OSKM)). mRNAs expression of several marker genes (OCT-3/4, NANOG and SOX2) for pluripotency was increased in Lenti-iPSCs (OSKMNL) and Sev-iPSCs (OSKM), but Sev-iPSCs (OSKM). Interestingly, SSEA-1 of surface markers was expressed only in Sev-iPSCs (OSKM), whereas SSEA-4, Tra-1-60 and Tra-1-81 were positively expressed in Lenti-iPSCs (OSKMNL). Exogenous reprogramming factors continuously expressed in Lenti-iPSCs (OSKMNL) for passage 20, whereas Sev-iPSCs (OSKM) did not express any exogenous transcription factors. Finally, only Lenti-iPSCs (OSKMNL) express the three germ layers and primordial germ cells markers in aggregated EBs. Conclusions: These results indicate that the viral transduction system of reprograming factors into porcine differentiated cells display different pluripotency characteristics in piPSCs.

시몽동의 기술철학의 “개체화”(individualization)의 기초모델은 “결정화”(crystalization)라는 물리화학적 현상에서 시작된다. 결정화 과정은 결정종(결정씨앗: germe/seed)과 모액(母液: mother liquid)이라는 주위환경(milieu) 사이에서 일어난다. 결정씨앗은 주위환경(milieu) 안에서 자신의 현실적 구조를 형성하며 확장해나간다. 한편 결정씨앗이 자라기 이전에는 잠재력(potential)으로만 남아 있던 주위환경은 결정씨앗이 자라기 시작하면서부터 발동하여, 그 잠재력이 에너지로 전환되고 역동성으로 가득 찬 주위환경이 되어 씨앗의 숙성과 구조화를 가능하게 하여 씨앗의 잠재성을 현실화한다. 시몽동의 결정화와 변환의 시각에서 세이머스 히니(Seamus Heaney)의 전 시집과 시론의 핵심적인 내용을 파악한 조감도를 그려보는 작업은 성장과정에 있는 젊은 시인의 “개체이전의 존재”와 “앞선 미래”를 내다보는 비전을 선험적(apriori)으로 제시해준다. 시몽동의 변환과정은 이질적인 힘을 임시적으로 집결하여 통합을 생성할 뿐 아니라, 존재나 실체를 둘러싸고 있는 것을 구조화하는 것을 설명하여, 개체이전의 존재의 과거와 현재로부터 미지의 미래로 창의적인 도약을 생성한다. 또한 주위환경 내에서 그리고 주위환경으로서 존재를 에워싸고 또 존재를 가능하게 하는 영역을 생성한다. 시몽동의 변환의 시학의 문맥에서 보면 히니의 시론과 시를 새로이 자리매김할 수 있다.

Equine follicle stimulating hormone receptor (eFSHR) has a large extracellular domain and an intracellular domain containing approximately 10 phosphorylation sites within the G protein-coupled receptor. This study was conducted to analyze the function of phosphorylation sties at the eFSHR C-terminal region. We constructed a mutant of eFSHR, in which the C-terminal cytoplasmic tail was truncated at residue 641 (eFSHR-t641). This removed 10 potential phosphorylation sites from the C-terminal region of the intracellular loop. The eFSHR-wild type (eFSHR-wt) and eFSHR-t641 cDNAs were subcloned into the pCMV-ARMS1-PK2 expression vector. These plasmids were transfected into PathHunter CHO-K1 Parental cells expressing β-arrestin 2 enzyme acceptor fusion protein and analyzed for agonist-induced cAMP response. The cAMP response in cells expressing eFSHR-t641 was lower than the response in cells expressing eFSHR-wt. EC50 values of eFSHR-wt and eFSHR-t641 were 1079 ng/mL and 1834 ng/mL, respectively. eFSHR-t641 was approximately 0.58-fold compared with that of eFSHR-wt. The maximal response in eFSHR-wt and eFSHR-t641 was 24.7 nM and 16.7 nM, respectively. The Rmax value of phosphorylation sites in eFSHR-t641 was also decreased to approximately 68.4% of that in eFSHR-wt. The collective data implicate that the phosphorylation sites in the eFSHR C-terminal region have a pivotal role in signal transduction in PathHunter CHO-K1 cells, and indicate that β-arrestin is involved in coupling the activated receptors to the internalization system.

The aim of this study was to investigate the role of Src homology 2-containing phosphotyrosine phosphatase SHP2 in intricate signaling network invoked by oocyte to achieve cytoplasmic maturation and also blastocyst development. Activation of SHP2 regulates multicellular differentiation, proliferation and survival through numerous signal pathways. The most prominent pathway is RAS/PI3K and p-AKT signaling cascade, as a result mitogenic effect become enhanced. Oocytes were cultured in cisplatin an anticancer drug, but selective activator of SHP2 and our grouping were SOF medium alone, SOF + EGF, SOF + CISPLATIN 0.3 μM, and SOF + EGF + CISPLATIN 0.3 μM. We evaluated that EGF neutralizes the apoptotic effect of cisplatin as well as maintain the high expression of SHP2, as a result blastocyst development become boosted up. We also found that inhibition of SHP2 with its specific inhibitor PHPS1 5 μM decreases the blastocyst development and neutralizes growth factors effect. The developmental ability and quality of bovine embryos were determined by assessing their cell number, gene expression, immunofluorescence, and immunoblot. The differences in embryo development between experimental groups were analyzed by one-way ANOVA. Our results show that SHP2 have significant effect on MAP kinase pathways which expand the cumulus cells during oocyte maturation and blastocyst development as compare to inhibition of SHP2 with PHPS1. SHP2 not only transduce the signaling of epidermal growth factor but it also has a role in signal transduction of FGF and IGF. The expression of ERK, PI3K/p-AKT and mTOR was increased with EGF, but with the treatment of SHP2 inhibitor the expression of these genes become drop done. So we can conclude from these results that SHP2 is important for oocyte maturation as well as for blastocyst development.

In this study, we analyzed signal transduction by equine follicle-stimulating hormone receptor (eFSHR) on stimulation with recombinant eelFSHβ/α (rec-eelFSHβ/α), natural porcine FSH (pFSH), and natural human FSH (hFSH). cAMP stimulation in CHO-K1 cells expressing eFSHR was determined upon exposure to different doses (0-1450 ng/mL) of these hormones. The EC50 value of rec-eelFSHβ/α was 53.35 ng/mL. The Rmax values of rec-eelFSHβ/α and pFSH were 28.12 and 2.88 ng/mL, respectively. The activity of rec-eelFSHβ/α was much higher than that of natural pFSH. However, signal transduction in CHO PathHunter Parental cells expressing eFSHR was not enhanced by stimulation with natural hFSH. Thus, rec-eelFSHβ/α was completely active in cells expressing eFSHR. However, natural hFSH did not invoke a signal response in cells expressing eFSHR. Particularly, natural pFSH was weakly active in the same cells. These results showed that eelFSHβ/α has potent activity in cells expressing eFSHR. Thus, rec-eelFSHβ/α may efficiently bind to eFSHR, where as natural hFSH does not bind to eFSHR.

Internalization and expression of extracellular molecules into cells and tissues is known very important process to biological processes and therapy of various diseases. In this study, we analyzed expression pattern of extracellular molecule after transduction into various human cells. To investigate cellular expression of internalized molecule, we used adenovirus containing green fluorescence protein. After infection of adenovirus into various human cells, the efficiency of intracellular gene expression was assessed with determining GFP expressing cells by fluorescence microscopy or FACS. After one day of adenovirus infection into HepG2 and A549, we observed that GFP expression was low at 10moi but expression levels were increased at 100moi in both cells. But, adenovirus infection into HCT116 showed low expression of GFP at concentrations from 1moi to 100moi. After 2 day infection with adenovirus, GFP expression level at 10moi and 100moi was highly increased in HepG2 and A549 compared with 1 day infection. Especially, GFP expression was significantly increased in HCT116 after 2 days infection. However, GFP expressing SKOV3 cells by adenovirus infection were not found in all the experimental conditions tested. For quantitative analysis of GFP expression of cells by adenovirus infection, we carried out FACS analysis. As a result, GFP was expressed at very low levels at 1moi in all cells used in this experiment. GFP expression slightly increased after increasing moi to 10 in HepG2, HCT116, and A549 cells. By 100moi infection of adenovirus, GFP expression was elevated to 10 fold higher than 10moi in HepG2 and A549 and about 4 fold elevation was observed in HCT116. A549 showed 20 fold higher expression of GFP than SKOV3. We also found that GFP expression by adenovirus infection was the highest in HepG2 cells. Protein expression was enhanced by increasing concentrations or time of adenovirus infection. In these results, GFP expression efficiency of adenoviral gene transduction reveals the highest in HepG2 and lowest in SKOV3 among the cells tested. Taken together, we could confirm that intracellular protein expression efficiency by transduction of extracellular gene was different in various human cells. Our study suggests that the cell types and cellular properties should be carefully examined to enhance expression efficiency of extracelluar molecules in biological research and disease therapy

Porphyromonas (P.) gingivalis lipopolysaccharide (Pg LPS) is the major pathogenic component of periodontal disease. In this study, we have attempted to determine the expression profiles of the signal transduction pathway genes induced by Pg LPS in comparison with Escherichia (E.) coli LPS (Ec LPS). DC2.4 cells were treated for two hours with 1 μg/mℓ of Pg LPS or 0.5μg/mℓ of Ec LPS. The total RNA from these cells was then isolated and reverse-transcribed. Gene expression profiles were then analyzed with a signal transduction pathway finder GEArray Q series kit and significant changes in expression were confirmed by real-time PCR. The microarray results indicated that several genes, including Tnfrsf10b, Vcam1, Scyb9, Trim25, Klk6, and Stra6 were upregulated in the DC2.4 cells in response to Pg LPS treatment, but were downregulated or unaffected by Ec LPS. Realtime PCR revealed that the expression of Trim25, Scyb9 and Tnfrsf10b was increased over the untreated control. Notably, Trim25 and Tnfrsf10b were more strongly induced by Pg LPS than by Ec LPS. These results provide greater insight into the signal transduction pathways that are altered by P. gingivalis LPS.

There is considerable evidence that ionizing radiation (IR) mediates checkpoint control, repair and cell death. In this study, we have used a high density microarray hybridization approach to characterize the transcriptional response of human breast carci

The large extracellular domain of glycoprotein hormone receptors is a unique feature within the G protein-coupled receptors (GPCRs) family. After interaction with the hormone, the receptor becomes coupled to Gs, which, in turn stimulates adenylyl cyclase and the production of cAMP. Potential phosphorylation sites exist in the C-terminal region of GPCRs. The experiments described herein represent attempts to determine the functions of the eel follicle-stimulating hormone receptor (eelFSHR). We constructed a mutant of eelFSHR, in which the C-terminal cytoplasmic tail was truncated at residue 614 (eelFSHR-t614). The eelFSHR-t614 lacked all potential phosphorylation sites present in the C-terminal region of eelFSHR. In order to obtain the eelFSHR ligand, we produced recombinant follicle-stimulating hormone (rec-eelFSHβ/α) in the CHO-suspension cells. The expression level was 2-3 times higher than that of the transient expression of eelFSH in attached CHO-K1 cells. The molecular weight of the rec-eelFSHβ/α protein was identified to be approximately 34 kDa. The cells expressing eelFSHR-t614 showed an increase in agonist-induced cAMP responsiveness. The maximal cAMP responses of cells expressing eelFSHR-t614 were lower than those of cells expressing eelFSHR-wild type (eelFSHR-WT). The EC50 following C-terminal deletion in CHO-K1 cells was approximately 60.4% of that of eelFSHR-WT. The maximal response in eelFSHR-t614 cells was also drastically lower than that of eelFSHR-WT. We also found similar results in PathHunter Parental cells expressing β-arrestin. Thus, these data provide evidence that the truncation of the C-terminal cytoplasmic tail phosphorylation sites in the eelFSHR greatly decreased cAMP responsiveness and maximal response in both CHO-K1 cells and Path-Hunter Parental cells expressing β-arrestin.

Previous studies showed that recombinant equine chorionic gonadotropin (rec-eCGβ/α) exhibits both folliclestimulating hormone (FSH) and luteinizing hormone (LH)-like activities in rat LHR- and FSHR-expressing cells. In this study, we analyzed signal transduction by eelFSHR and eelLHR upon stimulation with rec-eCGβ/α and native eCG. The cyclic adenosine monophosphate (cAMP) stimulation in CHO-K1 cells expressing eelLHR was determined upon exposure to different doses (0–1,450 ng/mL) of rec-eCGβ/α and native eCG. The EC50 values of rec-eCGβ/α and native eCG were 172.4 and 786.6 ng/mL, respectively. The activity of rec-eCGβ/α was higher than that of native eCG. However, signal transduction in the CHO PathHunter Parental cells expressing eelFSHR was not enhanced by stimulation with both agonist rec-eCGβ/α and native eCG. We concluded that rec-eCGβ/α and native eCG were completely active in cells expressing eelLHR, similar to the activity in the mammalian cells expressing LHRs. However, rec-eCGβ/α and native eCG did not invoke any signaling response in the cells expressing eelFSHR. These results suggest that eCG has a potent activity in cells expressing eelLHR. Thus, we also suggest that rec-eCGβ/α can induce eel maturation by administering gonadotropic reagents (LH), such as salmon pituitary extract.

ABA는 식물에서 비 생물학적 스트레스 내성에 관여하는 중 요한 식물 호르몬이다. 애기장대의 group A bZIP 전사인자는 ABA 신호전달 과정에 중요한 역할을 한다고 알려져 있다. 그러나 벼에서는 group A bZIP 전사인자의 기능이 잘 알려져 있지 않다. 따라서 우리는 벼에서 group A bZIP 전사인자인 OsABF3 (Oryza sativa ABA responsive element binding factor 3)를 연 구하였다. 이를 위해 벼의 다양한 조직과 다양한 스트레스(가 뭄, 염분, 저온, ABA, 산화 스트레스)에 따른 OsABF3 발현 패턴을 분석하였다. 또한 maize의 원형질체에서 GFP fusion 벡터를 사용한 세포 내 위치 분석을 통해 OsABF3가 핵단백질이라는 것을 확인하였다. Yeast one-hybrid 실험을 통해 OsABF3의 Cterminal 부분이 ABREs에 결합한다는 것과 N-terminal 부분 이 하위 유전자의 transactivation 하는데 필요하다는 것을 알수 있었다. 그리고 T-DNA가 삽입된 OsABF3의 homozygous 돌연변이체가 야생형과 과발현체에 비해 발아와 발아 후 단계 에서 고농도의 ABA에 대한 민감도가 더 감소한 것을 알 수 있었다. 결과적으로 종합해 볼 때 OsABF3는 ABA의 의존적인 경로를 통해 비 생물학적 스트레스에 반응하는 유전자의 발현을 조절하는 기능을 하는 전사 조절자이다. 또한 OsABF3의 transactivation을 측정하는 실험에 있어서 억제 domain이 존 재한다는 결과를 얻었다.

The immediate early gene c-fos has long been known as a molecular marker of neural activity. The neuron's activity is transformed into intracellular calcium influx through NMDA receptors and L-type voltage sensitive calcium channels. For the transcription of c-fos, neural activity should be strong enough to activate mitogen-activated protein kinase (MAPK) signaling pathway which shows low calcium sensitivity. Upon translation, the auto-inhibition by Fos protein regulates basal Fos expression. The pattern of external stimuli and the valence of the stimulus to the animal change Fos signal, thus the signal reflects learning and memory aspects. Understanding the features of multiple components regulating Fos signaling is necessary for the optimal generation and interpretation of Fos signal.

Wnt 신호 전달 과정은 다세포 생물체의 발생 과정에서 세포의 증식이나 분화를 조절하거나 성인 조직에서 항상성을 유지하는데 결정적인 역할을 한다. 따라서 Wnt 신호 전달의 조절에 이상이 생기면 암을 비롯한 다양한 질병이 유발되어진다. 최근 들어서 Wnt 신호 전달의 이상에 의해 유도될 것이라고 생각되어지는 질병의 수가 많아져서, Wnt 신호 전달의 조절에 관심을 갖는 연구자가 많아지고 있다. 많은 리뷰 논문이 출판되었지만, 대부분의 경우 Wnt 전문가