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ANTAGONIST - Crossref

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Last Updated: 10 August 2022

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Dynamics and structural changes of calmodulin upon interaction with the antagonist calmidazolium

CaM antagonists are needed for basic research as well as potential therapeutic applications due to their pleiotropic roles in normal and pathological cell functions. Calmidazolium, a potent small molecule antagonist of CaM and one of the most commonly used CaM inhibitors in cell biology, is a potent small molecule antagonist of CaM. Conclusions We have evidence that binding of a single molecule of CDZ promotes an open-to-closed conformational reorientation of CaM's two domains, resulting in a significant increase in protein dynamics as a function of a decrease in protein dynamics over a long time period. A CaM residues in close contact with CDZ and involved in the CaM:CDZ complex's stabilization have been discovered. Conclusion Our findings contribute to the rational design of more selective CaM antagonists, providing molecular insights into CDZ-induced behavior and structural changes of CaM leading to its inhibition and optimization, as well as the rationalization of more selective CaM antagonists.

Source link: https://doi.org/10.1186/s12915-022-01381-5


Andrographolide and Deoxyandrographolide Inhibit Protease and IFN-Antagonist Activities of Foot-and-Mouth Disease Virus 3Cpro

Using an in vitro cell-based assay, an investigation was conducted into the antiviral properties of andrographolide, deoxyandrographographographolide, and neoandrographographographolide against FMDV serotype A. FMDV in BHK-21 cells was inhibited by AGL and DAG, according to the study. The intracellular protease assay revealed that AGL and DAG blocked FMDV 3Cpro with an IC50 of 67. 41 and 25. 58 percent respectively, according to the u00b1 1. 41. 41 u00b5M. In addition, AGL and DAG significantly hampered with the 3Cpro's interferon antagonist activity by suppressing interferon-stimulating gene expression. AGL and DAG inhibited FMDV serotype A by being in contact with the 3Cpro and limiting its protease and IFN antagonist activities, according to Conclusively.

Source link: https://doi.org/10.3390/ani12151995


A peripheral opioid antagonist for treating urinary retention induced by opioids: A case report

Urinary retention is a poorly understood adverse effect related to opioid use, which is unclear. There is a paucity of data regarding the management of such changes in patients with advanced cancer receiving opioids. Despite this, a young man without comorbidities was receiving 30 mg of oxycodone for abdominal pain as a result of pancreatic cancer. Methadone therapy was very helpful on pain relief, but bladder dysfunction persists. Only anedoctal evidence of opioid-induced urinary retention exists for opioid-induced urinary retention. egypoetics are limited to the following points of action. According to the ostensible mechanism of urinary retention, the use of a peripheral opioid antagonist was planned. Outcome: The day after starting naldemedine, urinary retention completely recovered, and pain was pain-free, and it was well-controlled. Lessons: The rationale for using naldemedine was based on the fact that opioid-induced urinary retention was reduced due to the presence of peripheral receptors in the bladder and sphincter. View: In this case report, the effects of the peripheral opioid antagonist was immediate and long-lived.

Source link: https://doi.org/10.1177/02692163221107109


Discovery of the First Highly Selective Antagonist of the GluK3 Kainate Receptor Subtype

The majority of rapid excitatory synaptic transmission in the central nervous system is due to the presence of glutamate receptor ion channels within the family of glutamate receptors ion channels. GluK3 antagonist with submicromolar affinity and unprecedented binding selectivity was discovered by compound 28 in a 400-fold preference for GluK3 over other homomeric receptors, GluK1, GluK2, and GluA2. Using molecular docking and molecular dynamics simulations performed for individual GluK1 and GluK3 ligand-binding domains, the underlying determinants that gave the observed affinity profile of 28 people were investigated.

Source link: https://doi.org/10.3390/ijms23158797


The V2 receptor antagonist tolvaptan counteracts proliferation and invasivity in human cancer cells

Hyponatremia, the most common electrolyte replacement in clinical practice, has been attributed to a poorer prognosis in cancer patients. In vitro studies have shown that low extracellular sodium promotes cancer cell proliferation and invasiveness. So far, only a few in vitro results implying a specific role for tolvaptan in fighting cancer progression. The purpose of this research was to determine the effect and the mechanism of tolvaptan's action in cell lines from various tumors [i. e. Methods and findings First, we found that these cell lines express the V2 receptor. Cell proliferation was significantly reduced by Tolvaptan with an IC 50 in the micromolar range. Conclusions These results show that tolvaptan effectively stops tumor formation in vitro. Further studies will show whether the V2 receptor can be considered a potential target in anti-cancer strategies in the future.

Source link: https://doi.org/10.1007/s40618-022-01807-5


Recombinant LH supplementation improves cumulative live birth rates in the GnRH antagonist protocol: a multicenter retrospective study using a propensity score-matching analysis

Abstract Background: In follicle formation and oocyte maturation, the luteinizing hormone is critical. However, the benefit of recombinant LH supplementation to recombinant follicle stimulating hormone during controlled ovarian stimulation in the gonadotrophin releasing hormone antagonist therapy regimen is uncertain. Methods This multicenter retrospective cohort study recruited 899 GnRH antagonist cycles in three reproductive centers and matched them to 2652 r-FSH stimulating cycles in a 1:3 ratio using propensity score matching for potential confounders in a 1:3 ratio. In both fresh embryo transfer cycles and frozen embryo transfer cycles, R-LH supplementation resulted in a higher 2-pronuclear embryo rate, usable embryo rate, and live birth rate. Conclusions R-LH supplementation to r-FSH in the GnRH antagonist program was strongly associated with increased CLBR and live birth rates in fresh and FET cycles, as well as improved embryo quality without increasing the OHSS rate and cycle cancellation rate.

Source link: https://doi.org/10.1186/s12958-022-00985-4


Abuse potential assessment of the new dual orexin receptor antagonist daridorexant in recreational sedative drug users as compared to suvorexant and zolpidem

ABSTRACT RESULTS Abuse potential benefits have been found for the dual orexin receptor antagonists suvorexant and lemborexant, according to study objectives. Several secondary subjective and objective PD endpoints were also measured at the Emax of the drug-liking visual analog scale, which was assessed over 24 h. At 50 mg, the drug-liking VAS Emax of daridorexant was significantly lower than suvorexant and zolpidem, but not so good at 100 mg and 150 mg. Both control drugs and daridorexant were safe, and the pharmacokinetics of daridorexant were consistent with earlier trials that showed rapid absorption and elimination. Conclusions: In this large, valid human abuse potential research, daridorexant showed dose-related drug-liking among recreational sedative drug users with lower tolerances at the highest phase-3 dose, as well as identical effects in higher doses relative to supratherapeutic doses of suvorexant and zolpidem. 18 years old, NCT03657355, according to https://www. clinicaltrials. gov/ct43657355?term=ACT-541468&draw=3&rank=18, NCT03657355.

Source link: https://doi.org/10.1093/sleep/zsab224


Efficacy of prophylactic versus therapeutic administration of the NMDA receptor antagonist MK-801 on the acute neurochemical response to a concussion in a rat model combining force and rotation

OBJECTIVE RESULTS MODELIONS in amino acid concentrations are a significant contributor to the persistent neurological and behavioral effects induced by concussions and mild traumatic brain injuries. The aim of the present study was to investigate the effectiveness of prophylactic versus therapeutic use of MK-801, a promising NMDA receptor antagonist, on the acute changes in amino acid extracellular concentrations involved in excitotoxicity related to concussive trauma. MK-801, a Physiological saline, was administered intraperitoneally 60 minutes before or immediately following the induction of sham injury or concussion. RESULTS Following the introduction of concussion, glutamate, taurine, and glycine levels, as well as righting times in MK-801 treatment groups' cases were similar to those of vehicle-treated animals. In comparison, righting times and amino acid concentrations were comparable to those of sham-injured animals in the first ten minutes after the introduction of concussion in cases assigned to the MK-801 prophylaxis group.

Source link: https://doi.org/10.3171/2021.3.jns204163

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions