A phase 1, open-label, randomized, 2-way crossover study to assess the effects of acid reducing agent(s) on the pharmacokinetics of a single oral dose of JNJ-64417184 in healthy adult participants - Drug-drug Interaction of Multiple-dose JNJ-64417184

Start Date21 Jul 2020

Sponsor / Collaborator

Janssen-Cilag International NV

NCT04453189

/ CompletedPhase 1

A Phase 1, Open-label, Randomized, 2-Way Crossover Study to Assess the Effects of Acid-Reducing Agent(s) on the Pharmacokinetics of a Single Oral Dose of JNJ-64417184 in Healthy Adult Participants

The primary purpose of this study is to evaluate the effect of multiple-dose administration of lansoprazole on the single-dose pharmacokinetics (PK) of JNJ-64417184 in healthy adult participants; and to evaluate the effect of time-separated, multiple-dose administration of famotidine on the single-dose PK of JNJ-64417184 in healthy adult participants (optional).

Start Date20 Jul 2020

Sponsor / Collaborator

Janssen Research & Development LLC

NCT04426357

/ TerminatedPhase 1

A Single-dose, Open-label, Parallel-group Study to Evaluate the Effect of Renal Impairment on the Pharmacokinetics of JNJ-64417184 and Its Two Minor Metabolites JNJ-68294291 and JNJ-65201526 in Adult Participants

The main purpose of this study is to evaluate the pharmacokinetics of JNJ-64417184, JNJ-68294291, and JNJ-65201526 after a single oral dose of JNJ-64417184 in adult participants with various degrees of impaired renal function (moderate [optional], severe renal impairment, and end stage renal disease (ESRD) not requiring hemodialysis) compared to participants with normal renal function.

Start Date03 Jul 2020

Sponsor / Collaborator

Janssen Pharmaceutica NV

100 Clinical Results associated with RSV polymerase

100 Translational Medicine associated with RSV polymerase

0 Patents (Medical) associated with RSV polymerase

Literatures (Medical) associated with RSV polymerase

28 Nov 2023·Journal of General Virology

Actin cytoskeleton remodeling disrupts physical barriers to infection and presents entry receptors to respiratory syncytial virus

Article

Author: Bilawchuk, Leanne M ; McClelland, Ryley D ; Granoski, Madison J ; Proud, David ; Marchant, David J ; Elawar, Farah ; Kieser, Quinten J ; Stojic, Aleksandra ; Griffiths, Cameron ; Jamieson, Kyla

RSV is the leading cause of infant hospitalizations and a significant cause of paediatric and geriatric morbidity worldwide. Recently, we reported that insulin-like growth factor 1 receptor (IGF1R) was a receptor for respiratory syncytial virus (RSV) in airway epithelial cells and that activation of IGF1R recruited the coreceptor, nucleolin (NCL), to the cell surface. Cilia and mucus that line the airways pose a significant barrier to viral and bacterial infection. The cortical actin cytoskeleton has been shown by others to mediate RSV entry, so we studied the roles of the RSV receptors and actin remodelling during virus entry. We found that IGF1R expression and phosphorylation were associated with the ability of RSV to infect cells. Confocal immunofluorescence imaging showed that actin projections, a hallmark of macropinocytosis, formed around viral particles 30 min after infection. Consistent with prior reports we also found that virus particles were internalized into early endosome antigen-1 positive endosomes within 90 min. Inhibiting actin polymerization significantly reduced viral titre by approximately ten-fold. Inhibiting PI3 kinase and PKCζ in stratified air-liquid interface (ALI) models of the airway epithelium had similar effects on reducing the actin remodelling observed during infection and attenuating viral entry. Actin projections were associated with NCL interacting with RSV particles resting on apical cilia of the ALIs. We conclude that macropinocytosis-like actin projections protrude through normally protective cilia and mucus layers of stratified airway epithelium that helps present the IGF1R receptor and the NCL coreceptor to RSV particles waiting at the surface.

01 Jan 2023·Access microbiology

Binding of respiratory syncytial virus particles to platelets does not result in their degranulation in vitro.

Article

Author: Lakerveld, Anke J ; van Kasteren, Puck B ; van Erp, Elisabeth A

Respiratory syncytial virus (RSV) is a major cause of severe respiratory infection in infants and the elderly. The mechanisms behind severe RSV disease are incompletely understood, but a dysregulated immune response probably plays an important role. Platelets are increasingly being recognized as immune cells and are involved in the pathology of several viruses. The release of chemokines from platelets upon activation may attract, for example, neutrophils to the site of infection, which is a hallmark of RSV pathology. In addition, since RSV infections are sometimes associated with cardiovascular events and platelets express several known RSV receptors, we investigated the effect of RSV exposure on platelet degranulation. Washed human platelets were incubated with sucrose-purified RSV particles. P-selectin and CD63 surface expression and CCL5 secretion were measured to assess platelet degranulation. We found that platelets bind and internalize RSV particles, but this does not result in degranulation. Our results suggest that platelets do not play a direct role in RSV pathology by releasing chemokines to attract inflammatory cells.

13 Jul 2022·Journal of Agricultural and Food Chemistry

Crystal Structure of the Disease-Specific Protein of Rice Stripe Virus

Article

Author: Li, Shengping ; Sun, Lifang ; Chen, Pu ; Lin, Pingdong ; Chen, Lifei ; Dong, Panpan ; Zhang, Hong ; Chen, Yayu ; Wu, Yunkun ; Huang, Xiaojing ; Jiang, Meiqin ; Chen, Leiqing

The rice stripe virus (RSV) is responsible for devastating effects in East Asian rice-producing areas. The disease-specific protein (SP) level in rice plants determines the severity of RSV symptoms. Isothermal titration calorimetry (ITC) and bimolecular fluorescence complementation (BiFC) assays confirmed the interaction between an R3H domain-containing host factor, OsR3H3, and RSV SP in vitro and in vivo. This study determined the crystal structure of SP at 1.71 Å. It is a monomer with a clear shallow groove to accommodate host factors. Docking OsR3H3 into the groove generates an SP/OsR3H3 complex, which provides insights into the protein-binding mechanism of SP. Furthermore, SP's protein-binding properties and model-defined recognition residues were assessed using mutagenesis, ITC, and BiFC assays. This study revealed the structure and preliminary protein interaction mechanisms of RSV SP, shedding light on the molecular mechanism underlying the development of RSV infection symptoms.

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