Search results for: Receptor
#28728214 2017/07/20 Save this To Up
P2X receptor-channels in chronic pain pathways.Chronic pain is a highly prevalent debilitating condition for which treatment options remain limited for many patients. Ionotropic ATP signaling through excitatory and calcium-permeable P2X receptor-channels is now rightfully considered as a critical player in pathological pain generation and maintenance, therefore their selective targeting represents a therapeutic opportunity with promising yet untapped potential. Recent advances in the structural, functional and pharmacological characterization of rodent and human ATP-gated P2X receptor-channels have shed brighter light on the role of specific subtypes in the pathophysiology of chronic inflammatory, neuropathic or cancer pain. Here we will review the contribution of P2X3, P2X4 and P2X7 receptors to chronic pain and discuss the opportunities and challenges associated with the pharmacological manipulation of their function.
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#28728166 2017/07/20 Save this To Up
Whole-genome sequencing revealed novel prognostic biomarkers and promising targets for therapy of ovarian clear cell carcinoma.Ovarian clear cell carcinoma (OCCC) is mostly resistant to standard chemotherapy that results in poor patient survival. To understand the genetic background of these tumours, we performed whole-genome sequencing of OCCC tumours.
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#28728042 2017/07/20 Save this To Up
Pharmacological relationships and ligand discovery of G protein-coupled receptors revealed by simultaneous ligand and receptor clustering.Conventional ligand and receptor similarity methods have been extensively used for exposing pharmacological relationships and drug lead discovery. They may in some cases neglect minor relationships useful for target hopping particularly against the remote family members. To complement the conventional methods for capturing these minor relationships, we developed a new method that uses a SLARC (Simultaneous Ligand And Receptor Clustering) 2D map to simultaneously characterize the ligand structural and receptor binding-site sequence relationships of a receptor family. The SLARC maps of the rhodopsin-like GPCR family comprehensively revealed scaffold hopping, target hopping, and multi-target relationships for the ligands of both homologous and remote family members. Their usefulness in new ligand discovery was validated by guiding the prospective discovery of novel indole piperazinylpyrimidine dual-targeting adenosine A2A receptor antagonist and dopamine D2 agonist compounds. The SLARC approach is useful for revealing pharmacological relationships and discovering new ligands at target family levels.
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#28727987 2017/07/20 Save this To Up
Associations of Autoimmunity, Immunodeficiency, Lymphomagenesis, and Gut Microbiota in Mice with Knockins for a Pathogenic Autoantibody.A number of mouse strains transgenic for B-cell receptors specific for nucleic acids or other autoantigens have been generated to understand how autoreactive B cells are regulated in normal and autoimmune mice. Previous studies of nonautoimmune C57BL/6 mice heterozygous for both the IgH and IgL knockins of the polyreactive autoantibody, 564, produced high levels of autoantibodies in a largely Toll-like receptor 7-dependent manner. Herein, we describe studies of mice homozygous for the knockins that also expressed high levels of autoantibodies but, unlike the heterozygotes, exhibited a high incidence of mature B-cell lymphomas and enhanced susceptibility to bacterial infections. Microarray analyses and serological studies suggested that lymphomagenesis might be related to chronic B-cell activation promoted by IL-21. Strikingly, mice treated continuously with antibiotic-supplemented water did not develop lymphomas or abscesses and exhibited less autoimmunity. This mouse model may help us understand the reasons for enhanced susceptibility to lymphoma development exhibited by humans with a variety of autoimmune diseases, such as Sjögren syndrome, systemic lupus erythematosus, and highly active rheumatoid arthritis.
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#28727938 2017/07/20 Save this To Up
Difference in the response to Angiotensin II between left and right ventricular endocardial endothelial cells.Previous studies focused on the right ventricular endocardial endothelial cells (EECRs) and showed that angiotensin II (AngII) induced increase in cytosolic and nuclear calcium via AT1 receptor activation. In the present study, we verified whether the response of left EECs (EECLs) to AngII is different than that of EECRs. Our results showed that the EC50 of the AngII-induced increase of cytosolic and nuclear calcium in EECLs was ten times higher (around 2x10-13M) than in EECRs (around 8x10-12M). The densities of both AT1 and AT2 receptors were also higher in EECLs than those previously reported in EECRs. The effect of AngII was mediated in both cell types via the activation of AT1 receptors. Treatment with Ang II induced a significant increase of cytosolic and nuclear AT1 receptors in EECRs whereas the opposite was found in EECLs. In both cell types, there was a transient increase of cytosolic and nuclear AT2 receptors following the AngII treatment. In conclusion, our results showed that both AT1 and AT2 receptors densities are higher in both EECLs compared to what was reported in EECRs. The higher density of AT1 receptors in EECLs compared to REECs may explain, in part, the higher sensitivity of EECLs to AngII.
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#28727921 2017/07/20 Save this To Up
Effect of Lysophosphatidylglycerol on Intracellular Free Ca2+ Concentration in A10 Vascular Smooth Muscle Cells.Although plasma levels of lysophosphatidylglycerol (LPG) are increased in hypertension, its role in the pathogenesis of vascular defects is not clear. In view of the importance of Ca2+-overload in causing vascular smooth muscle (VSM) dysfunction, the action of LPG on [Ca2+]i in cultured A10 VSM cell line was examined by using Fura 2-AM acetoxymethyl ester technique. LPG was found to induce a concentration-dependent increase in [Ca2+]i in VSM cells. This change was dependent both on the extracellular and intracellular Ca2+ sources as it was reduced by 30% by EGTA, an extracellular Ca2+ chelator, and 70% by tharpsigargin, a sarcoplasmic reticulum (SR) Ca2+-pump inhibitor. However, the increase in [Ca2+]i due to LPG was not altered by caffeine or ryanodine, which affect Ca2+-release through the ryanodine receptors in the SR. On the other hand, LPG-induced change in [Ca2+]i was suppressed by 2-Nitro-4-carboxyphenyl N,N-diphenylcarbamate, a phospholipase C (PLC) inhibitor, as well as by xestospongin and 2 aminoethoxydiphenyl borate, two inositol trisphosphate (IP3) receptor inhibitors in the SR. These observations support the view that LPG-induced increase in [Ca2+]i in VSM cells is mainly a result of Ca2+-release from Ca2+ pool in the SR through PLC/IP3-sensitive signal transduction mechanism. Furthermore, it is suggested that the elevated level of LPG may induce intracellular Ca2+-overload and thus play a critical role in the development of vascular abnormalities.
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#28727906 2017/07/20 Save this To Up
Potential of telmisartan in the treatment of benign prostatic hyperplasia.Benign prostatic hyperplasia (BPH) is a common health problem in aging men. This study was carried out to investigate the protective effect of telmisartan on testosterone induced-BPH in rats. Fifty-four male Wistar rats (200 - 250g) were randomly divided into 9 groups (n =6) and orally treated for 28 consecutive days: group 1- vehicle normal, olive oil (10 ml/kg); group 2- BPH model control (10 ml/kg); groups 3-5 - telmisartan (5, 10 or 20 mg/kg, respectively); group 6- pioglitazone (20 mg/kg); group 7- celecoxib (20 mg/kg); group 8- combination of telmisartan (5 mg/kg) and pioglitazone (20 mg/kg); group 9- combination of telmisartan (5 mg/kg) and celecoxib (20 mg/kg). Animals in groups 2-9 were given testosterone propionate in olive oil (3 mg/kg) subcutaneously 15 min after pretreatments. On day 29, blood was collected for the estimation of serum testosterone and prostate specific antigen (PSA). The prostates were excised, weighed and subjected to biochemical and histological studies. Testosterone injection induced significant increase in prostatic index, serum testosterone and PSA suggesting BPH as well as increased prostate oxidative stress which were ameliorated with the pretreatment of rats with telmisartan or co-administration of celecoxib and pioglitazone. Histologic examination showed that testosterone disrupted the morphology of the prostate epithelial cells evidenced in the involution of the epithelial lining of the acini into the lumen indicating BPH which was reversed by telmisartan. Findings from this study showed that telmisartan alone or in combination with pioglitazone prevented the development of testosterone induced prostatic hyperplasia. This article is protected by copyright. All rights reserved.
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#28727849 2017/07/20 Save this To Up
Associations between PPARG polymorphisms and the risk of essential hypertension.Peroxisome proliferator-activated receptor gamma (PPARG) plays an important role in the pathogenesis and maintenance of essential hypertension (EH). It has been suggested that polymorphisms of PPARG are associated with the risk of EH. However, findings to date remain controversial. To elucidate the associations between the PPARG Pro12Ala and C161T polymorphisms and EH risk, a meta-analysis was carried out.
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#28727840 2017/07/20 Save this To Up
Dual inhibition of Fes and Flt3 tyrosine kinases potently inhibits Flt3-ITD+ AML cell growth.Acute myelogenous leukemia (AML) is often associated with activating mutations in the receptor tyrosine kinase, Flt3, including internal tandem duplications (ITDs) within the regulatory juxtamembrane region. Previous studies have linked Flt3-ITD to the activation of the Fes protein tyrosine kinase in AML, and RNAi-knockdown studies suggest that Fes may be required for Flt3 function. In this study, we tested Fes inhibitors from three different chemical classes for their growth-suppressive activity against Flt3-ITD+ myeloid leukemia cell lines (MV4-11, MOLM-13 and MOLM-14) vs. myeloid cells with wild-type Flt3 (THP-1). All Fes inhibitors selectively inhibited the growth of Flt3-ITD+ AML cells, with IC50 values for diaminopyrimidine and pyrrolopyridine inhibitors ranging from 19 to 166 nM. In contrast, a pyrazolopyrimidine inhibitor was less potent in Flt3-ITD+ AML cells, with IC50 values in the 1.0 μM range. In vitro kinase assays showed that the most potent inhibitors of Flt3-ITD+ AML cell proliferation blocked both Fes and Flt3-ITD kinase activity, while the pyrazolopyrimidine was more selective for Fes vs. Flt3-ITD. All three inhibitors induced significant apoptosis in Flt3-ITD+ AML cells, with potency equivalent to or greater than the established Flt3-ITD inhibitor, tandutinib. Transformation of TF-1 cells with Flt3-ITD resulted in constitutive activation of endogenous Fes, and rendered the cells highly sensitive to all three Fes inhibitors with IC50 values in the 30-500 nM range. The pyrrolopyridine compound also induced apoptotic responses in patient-derived Flt3-ITD+ AML bone marrow cells but not in normal bone marrow mononuclear cells. These results demonstrate that Fes kinase activity contributes to Flt3-ITD signaling in AML, and suggests that dual inhibition of both Flt3 and Fes may provide a therapeutic advantage for the treatment of Flt3-ITD+ AML.
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#28727830 2017/07/20 Save this To Up
The receptor tyrosine kinase AXL promotes migration and invasion in colorectal cancer.The receptor tyrosine kinases (RTKs) TYRO3, AXL and MERTK (TAM) have well-described oncogenic functions in a number of cancers. Notwithstanding, TAM RTKs are also potent and indispensable inhibitors of inflammation. The combined deletion of Axl and Mertk in mice enhances chronic inflammation and autoimmunity, including increased inflammation in the gut and colitis-associated cancer. On the other hand, deletion of Tyro3 increases the risk of allergic responses. Therefore, the indiscriminate inhibition of these TAM RTKs could result in undesirable immunological diseases. Here we show that AXL, but not MERTK or TYRO3 expression is enhanced in late stage colorectal cancer (CRC) and AXL expression associates with a cell migration gene signature. Silencing AXL or the inhibition of AXL kinase activity significantly inhibits tumor cell migration and invasion. These results indicate that the selective inhibition of AXL alone might confer sufficient therapeutic benefit in CRC, while preserving at least some of the beneficial, anti-inflammatory effects of MERTK and TYRO3 RTKs.
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