Improgo MR, Johnson CW, Tapper AR, Gardner PD. "PLoS One. 2011"
Intruduction:
A nuclear magnetic resonance-based ligand screening method making use of a paramagnetic lanthanide probe is offered. By repairing a paramagnetic lanthanide ion to a goal protein, a pseudo-contact shift (PCS) plus a paramagnetic relaxation enhancement (PRE) could be noticed for both the goal protein and its bound ligand. According to PRE and PCS data, the bound ligand is then screened from the compound library as well as the construction with the ligand-protein complicated is determined.
PRE is definitely an isotropic paramagnetic impact noticed inside 30 Å in the lanthanide ion, and it is utilized for the ligand screening inside the present research. PCS is an anisotropic paramagnetic effect providing long-range (~40 Å) distance and angular info on the noticed nuclei relative to the paramagnetic lanthanide ion, and used for the construction perseverance from the ligand-protein complex.
Since a two-point anchored lanthanide-binding peptide tag is used for repairing the lanthanide ion for the target protein, this screening strategy might be typically applied to non-metal-binding proteins. The usefulness of this technique was demonstrated in the situation of the growth element receptor-bound protein 2 (Grb2) Src homology two (SH2) domain and its low- and high-affinity ligands.
BACKGROUND:
Frontline treatment of small cell lung carcinoma (SCLC) relies greatly on chemotherapeutic agents and radiation treatment. Although SCLC individuals reply properly to first cycles of chemotherapy, they eventually develop resistance. Identification of novel therapies towards SCLC is as a result imperative.
METHODS AND FINDINGS:
We have created a bioluminescence-based cell viability assay for high-throughput screening of anti-SCLC agents. The assay was very first validated via common pharmacological agents and RNA interference employing two human SCLC cell lines. We then utilized the assay in a high-throughput screen employing the LOPAC(1280) compound library. The screening identified several drugs that target traditional most cancers signaling pathways also as neuroendocrine markers in SCLC. In specific, perturbation of dopaminergic and serotonergic signaling inhibits SCLC cell viability.
CONCLUSIONS:
The convergence of our pharmacological information with important SCLC pathway parts reiterates the importance of neurotransmitter signaling in SCLC etiology and points to possible qualified prospects for drug improvement.
2011年12月14日星期三
2011年12月11日星期日
G protein-coupled inward rectifier K(+) (GIRK) channels for the development of new therapeutic agents.
Walsh KB. "Front Pharmacol. 2011"
G protein-coupled inward rectifier K(+) (GIRK) channels stand for novel targets for your advancement of new therapeutic agents. GIRK channels are activated by a big number of G protein-coupled receptors (GPCRs) and control the electrical activityperform have already been implicated inside the patho-physiology of neuropathic discomfort, drug addiction, cardiac arrhythmias, and other disorders. Even so, the pharmacology of those channels stays mainly unexplored.
In this paper we describe the development of a screening assay for identifying new modulators of neuronal and cardiac GIRK channels. Pituitary (AtT20) and cardiac (HL-1) cell lines expressing GIRK channels were cultured in 96-well plates, loaded with oxonol membrane potential-sensitive dyes and measured employing a fluorescent imaging plate reader.
Activation from the endogenous GPCRs in the cells caused a quick, time-dependent lower in the fluorescent sign; indicative of K(+) efflux via the GIRK channels (GPCR stimulation as opposed to manage, Z'-factor = 0.5-0.7). As anticipated this sign was inhibited by addition of Ba(2+) along with the GIRK channel toxin tertiapin-Q.
To check the utility in the assay for screening GIRK channel blockers, cells were incubated for 5 min using a compound library of Na(+) and K(+) channel modulators. Ion transporter inhibitors including 5-(N,N-hexamethylene)-amiloride and SCH-28080 were identified as blockers in the GIRK channel at sub-micromolar concentrations. Therefore, the screening assay will be helpful for expanding the limited pharmacology of the GIRK channel and in developing new agents for the therapy of GIRK channelopathies.
As influenza viruses have created resistance towards existing medications, it really is urgent to find prospective novel antiviral Kinase inhibitors. Right here we produced an influenza virus reporter cell line by which the luciferase gene was driven by the influenza virus promoter and screened a small compound library (NCI Diversity Set II). Ten compounds had been discovered to get inhibitory activity versus influenza A virus H1N1. Among them, 4 compounds blocked influenza virus replication through inhibiting the exercise of vRNP.
The compound NSC 335506 inhibited HA-mediated membrane fusion. It confirmed the inhibitory exercise against H1N1, H9N2 and H5N1 subtype although not H3N2. Our results demonstrated that influenza virus reporter cell is a really valuable instrument to identify novel inhibitors towards influenza A virus.
G protein-coupled inward rectifier K(+) (GIRK) channels stand for novel targets for your advancement of new therapeutic agents. GIRK channels are activated by a big number of G protein-coupled receptors (GPCRs) and control the electrical activityperform have already been implicated inside the patho-physiology of neuropathic discomfort, drug addiction, cardiac arrhythmias, and other disorders. Even so, the pharmacology of those channels stays mainly unexplored.
In this paper we describe the development of a screening assay for identifying new modulators of neuronal and cardiac GIRK channels. Pituitary (AtT20) and cardiac (HL-1) cell lines expressing GIRK channels were cultured in 96-well plates, loaded with oxonol membrane potential-sensitive dyes and measured employing a fluorescent imaging plate reader.
Activation from the endogenous GPCRs in the cells caused a quick, time-dependent lower in the fluorescent sign; indicative of K(+) efflux via the GIRK channels (GPCR stimulation as opposed to manage, Z'-factor = 0.5-0.7). As anticipated this sign was inhibited by addition of Ba(2+) along with the GIRK channel toxin tertiapin-Q.
To check the utility in the assay for screening GIRK channel blockers, cells were incubated for 5 min using a compound library of Na(+) and K(+) channel modulators. Ion transporter inhibitors including 5-(N,N-hexamethylene)-amiloride and SCH-28080 were identified as blockers in the GIRK channel at sub-micromolar concentrations. Therefore, the screening assay will be helpful for expanding the limited pharmacology of the GIRK channel and in developing new agents for the therapy of GIRK channelopathies.
As influenza viruses have created resistance towards existing medications, it really is urgent to find prospective novel antiviral Kinase inhibitors. Right here we produced an influenza virus reporter cell line by which the luciferase gene was driven by the influenza virus promoter and screened a small compound library (NCI Diversity Set II). Ten compounds had been discovered to get inhibitory activity versus influenza A virus H1N1. Among them, 4 compounds blocked influenza virus replication through inhibiting the exercise of vRNP.
The compound NSC 335506 inhibited HA-mediated membrane fusion. It confirmed the inhibitory exercise against H1N1, H9N2 and H5N1 subtype although not H3N2. Our results demonstrated that influenza virus reporter cell is a really valuable instrument to identify novel inhibitors towards influenza A virus.
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