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           Search results for: Rat TGF-beta-inducible early response gene-1(TIEG1)ELISA Kit   

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#27545814   2016/09/30 Save this To Up

Natural myocardial ECM patch drives cardiac progenitor based restoration even after scarring.

To evaluate the regenerative capacity of non-supplemented and bioactive patches made of decellularized porcine cardiac extracellular matrix (pcECM) and characterize the biological key factors involved in possible cardiac function (CF) restoration following acute and 8weeks chronic MI.

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#27188306   2016/06/20 Save this To Up

Taurine Reduced Epidural Fibrosis in Rat Models after Laminectomy via Downregulating EGR1.

Epidural fibrosis, a common complication after laminectomy, has been demonstrated to be closely associated with poor surgical outcomes. Previous studies showed that taurine had remarkable anti-fibrotic effects on lung and liver fibrosis. We performed this study to investigate the effects of taurine in rat models of epidural fibrosis after laminectomy and to explore the potential molecular mechanism.

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#26770872   2016/01/15 Save this To Up

Role of mast cell in the late phase of contact hypersensitivity induced by trimellitic anhydride.

Mast cells are known as effector cells of IgE-mediated allergic responses, but role of mast cells in contact hypersensitivity (CHS) has been considered controversial. In this study, we investigated role of mast cell in trimellitic anhydride (TMA)-induced CHS. The mice were sensitized to TMA on the back and repeatedly challenged with TMA on the left ear at 1-week intervals. The ear after challenge showed biphasic responses. The repetition of TMA challenge shifted in time course of ear response and enlarged the extent of early and late phase reactions in proportion to the frequency of TMA challenges in C57BL/6 mice. In late phase reaction, peak of ear response by single challenge showed at 24 hours after challenge, but the peak by repeat challenges at 8 hours after the last challenge. Number of mast cells and eosinophils per unit area increased in proportion to frequency of TMA challenges. However, mast cell-deficient WBB6F1/J-Kit(W)/Kit(W-v) mice developed the late phase reaction without the early phase reaction. The repetition of TMA challenge shifted in time course of ear response and enlarged the extent of ear response and the infiltration of eosinophils. The magnitude of these responses observed according to the frequency of the TMA challenge in mast cell-deficient WBB6F1/J-Kit(W)/Kit(W-v) mice was significantly lower than that in C57BL/6 mice. Also TMA elicited mast cell degranulation and histamine release from rat peritoneal mast cells in a concentration-dependent manner. Conclusively, TMA induces the early and late phase reactions in CHS, and mast cells may be required for TMA-induced CHS.

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#24502117   2014/02/07 Save this To Up

[Serum glucose concentration in subacute intoxication with chlorpyrifos - organophosphate insecticide].

Epidemiological studies suggest that exposure to organophosphate insecticides enhances the risk of various diseases, including neurological disorders, e.g. Parkinson's or Alzheimer's disease, arteriosclerosis and diabetes mellitus. For this reason the aim of the presented study was to estimate serum concentration of glucose in subchronic intoxication with low doses of chlorpyrifos, an organophosphate insecticide.

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#22777679   2012/09/18 Save this To Up

Parabens inhibit the early phase of folliculogenesis and steroidogenesis in the ovaries of neonatal rats.

Parabens are widely used as anti-microbial agents in the cosmetic and pharmaceutical industries. Recently, parabens have been shown to act as xenoestrogens, a class of endocrine disruptors. In the present study, 55 female pups were given daily subcutaneous injections of methyl-, propyl-, and butyl-paraben or 17beta-estradiol (E2) during neonatal Day 1-7. The ovaries were excised on postnatal Day 8, then fixed and stained with hematoxylin and eosin for histological analysis. The follicles were counted and classified as being in the primordial, early primary, or primary stages. The number of primordial follicles increased while early primary follicles decreased at the high doses of propyl- and butyl-paraben. The levels of anti-Mullerian hormone (AMH) and Foxl2 mRNA increased by propyl- and butyl-parabens whereas kit ligand/stem cell factor (KITL) expression was up regulated only by butyl-paraben. The mRNA levels of StAR and Cyp11a1 were significantly decreased after treatment with methyl-, propyl-, and butyl-parabens. Consistent with its use as a positive control, E2 regulated the expression of KITL, StAR, and Cyp11a1 genes, but surprisingly did not affect AMH and Foxl2 levels. Thus, E2 and parabens had different effects on the regulation of folliculogenic and steroidogenic genes, demonstrating the estrogenic and nonestrogenic properties of parabens in the ovary. Taken together, our data show that parabens stimulated AMH mRNA expression and consequently inhibited the early phase of folliculogenesis in the ovaries of neonatal female rat. The levels of steroidogenic enzymes, indicators of follicle differentiation, appeared to be regulated by parabens through inhibition of their transcriptional repressor, Foxl2.

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#22590612   2012/05/16 Save this To Up

Ischemia-reperfusion injury and pregnancy initiate time-dependent and robust signs of up-regulation of cardiac progenitor cells.

To explore how cardiac regeneration and cell turnover adapts to disease, different forms of stress were studied for their effects on the cardiac progenitor cell markers c-Kit and Isl1, the early cardiomyocyte marker Nkx2.5, and mast cells. Adult female rats were examined during pregnancy, after myocardial infarction and ischemia-reperfusion injury with/out insulin like growth factor-1(IGF-1) and hepatocyte growth factor (HGF). Different cardiac sub-domains were analyzed at one and two weeks post-intervention, both at the mRNA and protein levels. While pregnancy and myocardial infarction up-regulated Nkx2.5 and c-Kit (adjusted for mast cell activation), ischemia-reperfusion injury induced the strongest up-regulation which occurred globally throughout the entire heart and not just around the site of injury. This response seems to be partly mediated by increased endogenous production of IGF-1 and HGF. Contrary to c-Kit, Isl1 was not up-regulated by pregnancy or myocardial infarction while ischemia-reperfusion injury induced not a global but a focal up-regulation in the outflow tract and also in the peri-ischemic region, correlating with the up-regulation of endogenous IGF-1. The addition of IGF-1 and HGF did boost the endogenous expression of IGF and HGF correlating to focal up-regulation of Isl1. c-Kit expression was not further influenced by the exogenous growth factors. This indicates that there is a spatial mismatch between on one hand c-Kit and Nkx2.5 expression and on the other hand Isl1 expression. In conclusion, ischemia-reperfusion injury was the strongest stimulus with both global and focal cardiomyocyte progenitor cell marker up-regulations, correlating to the endogenous up-regulation of the growth factors IGF-1 and HGF. Also pregnancy induced a general up-regulation of c-Kit and early Nkx2.5+ cardiomyocytes throughout the heart. Utilization of these pathways could provide new strategies for the treatment of cardiac disease.

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#22444623   2012/09/03 Save this To Up

Anxiety-like behaviour and associated neurochemical and endocrinological alterations in male pups exposed to prenatal stress.

Epidemiological studies suggest that emotional liability in infancy could be a predictor of anxiety-related disorders in the adulthood. Rats exposed to prenatal restraint stress ("PRS rats") represent a valuable model for the study of the interplay between environmental triggers and neurodevelopment in the pathogenesis of anxious/depressive like behaviours. Repeated episodes of restraint stress were delivered to female Sprague-Dawley rats during pregnancy and male offspring were studied. Ultrasonic vocalization (USV) was assessed in pups under different behavioural paradigms. After weaning, anxiety was measured by conventional tests. Expression of GABA(A) receptor subunits and metabotropic glutamate (mGlu) receptors was assessed by immunoblotting. Plasma leptin levels were measured using a LINCOplex bead assay kit. The offspring of stressed dams emitted more USVs in response to isolation from their mothers and showed a later suppression of USV production when exposed to an unfamiliar male odour, indicating a pronounced anxiety-like profile. Anxiety like behaviour in PRS pups persisted one day after weaning. PRS pups did not show the plasma peak in leptin levels that is otherwise seen at PND14. In addition, PRS pups showed a reduced expression of the γ2 subunit of GABA(A) receptors in the amygdala at PND14 and PND22, an increased expression of mGlu5 receptors in the amygdala at PND22, a reduced expression of mGlu5 receptors in the hippocampus at PND14 and PND22, and a reduced expression of mGlu2/3 receptors in the hippocampus at PND22. These data offer a clear-cut demonstration that the early programming triggered by PRS could be already translated into anxiety-like behaviour during early postnatal life.

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#22239082   2012/01/13 Save this To Up

4-vinylcyclohexene diepoxide: a model chemical for ovotoxicity.

The occupational chemical 4-vinylcyclohexene diepoxide (VCD) has been shown to cause selective destruction of ovarian small pre-antral (primordial and primary) follicles in rats and mice by accelerating the natural, apoptotic process of atresia. Chemicals that destroy primordial follicles are of concern to women because exposure can result in premature ovarian failure (early menopause). Initial studies using in vivo exposure of rats determined that VCD specifically targets primordial and primary (small pre-antral) follicles and that repeated dosing is required. Through a method of isolation of ovarian small follicles, biochemical and molecular studies determined that intracellular pro-apoptotic pathways are activated following VCD dosing in rats. Subsequently an in vitro system using cultured whole neonatal rat ovaries was developed to provide more mechanistic information. That approach was used to demonstrate that the cell survival c-kit/kit ligand signaling pathway is the direct target for VCD-induced ovotoxicity. Specifically, VCD directly interacts with the oocyte-associated c-kit receptor to inhibit its autophosphorylation, and thereby impair oocyte viability. The cellular and molecular approach developed to determine these findings is described in this article.

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#21547497   2011/08/04 Save this To Up

Role for inducible cAMP early repressor in promoting pancreatic beta cell dysfunction evoked by oxidative stress in human and rat islets.

Pro-atherogenic and pro-oxidant, oxidised LDL trigger adverse effects on pancreatic beta cells, possibly contributing to diabetes progression. Because oxidised LDL diminish the expression of genes regulated by the inducible cAMP early repressor (ICER), we investigated the involvement of this transcription factor and of oxidative stress in beta cell failure elicited by oxidised LDL.

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#21534738   2011/05/03 Save this To Up

Protective effects of early hypoxic post-conditioning in cultured cortical neurons.

Recent evidence suggests that delayed hypoxic post-conditioning is neuroprotective. The aim of the present study was to test whether early post-conditioning applied immediately after hypoxia could protect cultured neurons from hypoxia/reoxygenation (H/R)-induced injuries.

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