Process development for quantitation and vaccine efficacy assessment of recombinant hemagglutinin-neuraminidase

Publication date: Available online 19 November 2019Source: Process BiochemistryAuthor(s): Ping Ying Lye, Suriani Mohd Noor, Syamsiah Aini Shohaimi, Niny Fariza Junoh, Soo Choon Tan, Shinichi Iwamoto, Eiji Kotani, Mohd Nor Norazmi, Toshihiro Nagamine, Hajime Mori, Mervyn W.O. LiewABSTRACTRecombinant hemagglutinin-neuraminidase (HN) based subunit vaccine, which is non-infectious and can be produced using insect cell-culture systems, is a potential alternative to conventional live and inactivated Newcastle disease virus (NDV) vaccines. However, process development for manufacture and efficacy assessment of HN subunit vaccines has been hampered by the absence of reference standards, a cornerstone for robust and sensitive quantitative analytical methods. In this work, a downstream purification strategy was developed to obtain NDV HN which was expressed with a hexa-histidine fusion tag (rHN) to facilitate detection using generic antibodies. Highly purified rHN (∼95%) attained after detergent extraction and two-stage ion-exchange-hydroxyapatite column chromatography was subsequently utilized as reference standards for quantitative ELISA development. Recovery of rHN at different stages of purification was monitored. Quantitation of rHN from crude cell lysates was performed for dose-ranging antibody response and protective efficacy studies. A higher dose (1500 ng) of rHN was correlated to a significant reduction in virus shedding and attainment of herd immunity, as indicate...
Source: Process Biochemistry - Category: Biochemistry Source Type: research

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Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
Up to 200,000 Regimens of Janssen ’s Investigational Ebola Vaccine to be Supplied to Rwanda for Use in Border Region near Democratic Republic of the Congo (DRC)
Source: Johnson and Johnson - Category: Pharmaceuticals Source Type: news
Authors: Babaer D, Zheng M, Ivy MT, Zent R, Tiriveedhi V Abstract Previous phase I DNA-vaccine based clinical trials using Mammaglobin-A (Mam-A), a human breast tumor associated antigen (TAA), demonstrated that this agent was safe and efficient at treating patients with stage IV breast cancer. The long-term success of cancer vaccines is limited by the diminished expression of human leukocyte antigen (HLA) class I molecules in the tumor microenvironment. The current study assessed the impact of various selenocompounds on the expression of HLA class I molecules in THP-1 cells, an apparent proficient antigen that pres...
Source: Oncology Letters - Category: Cancer & Oncology Tags: Oncol Lett Source Type: research
Publication date: 7 December 2019Source: New Scientist, Volume 244, Issue 3259Author(s):
Source: New Scientist - Category: Science Source Type: research
CONCLUSION: Deficiencies in public knowledge and insufficient provider practices are likely contributing to the suboptimal rates of HPV vaccination among eligible males. Additionally, eligible males are not interested in speaking with their healthcare providers about either HPV or the HPV vaccine. If the rates of HPV vaccination within the male population are to increase, health educators, public health proponents, and vaccine advocates need to devise a more effective approach to disseminate this information to eligible male recipients. PMID: 31808930 [PubMed - as supplied by publisher]
Source: Military Medicine - Category: International Medicine & Public Health Tags: Mil Med Source Type: research
After a deadly measles outbreak in Samoa, the government there says nearly everyone who is eligible has now been vaccinated for the disease. At least 65 people have died since October, and 57 of them were children under the age of four. Carter Evans reports.
Source: Health News: - Category: Consumer Health News Source Type: news
dejek Porcine circovirus type 2 (PCV2) is a globally spread pathogen controlled with generally highly efficacious vaccination protocols. In order to compare PCV2 detection profiles in farms with different vaccination statuses, serum (359) and fecal pools (351) and oral fluids (209) from four farms that do not vaccinate against PCV2 (NON-VAC) and from 22 farms that do vaccinate (VAC) were tested with quantitative real-time PCR. Additionally, nucleotide sequences of ORF2 of the virus were obtained from selected samples. Three genotypes, PCV2a, PCV2b, and PCV2d, were detected. Significant differences (p < 0.05) in ...
Source: Viruses - Category: Virology Authors: Tags: Article Source Type: research
This study investigating a multiphenotypic approach, based on the comparative study of a wild type strain of P. aeruginosa, its isogenic OprF mutant. Both P. aeruginosa PAO1 and OprF mutant strains were grown in same condition and cultures were subjected to further analysis by SDS PAGE, pyocyanin production and biofilm formation that was analyse using scanning electron microscopy. Based on biofilm formation essay and pyocyanin production, the study showed that OprF plays a dynamic role in P. aeruginosa virulence. The absence of OprF results in slow growth rate corresponded to elongated lag phase and reduced biofilm product...
Source: Saudi Pharmaceutical Journal - Category: Drugs & Pharmacology Source Type: research
Chitin: A "Hidden Figure" in the Fungal Cell Wall. Curr Top Microbiol Immunol. 2019 Dec 06;: Authors: Brown HE, Esher SK, Alspaugh JA Abstract Chitin and chitosan are two related polysaccharides that provide important structural stability to fungal cell walls. Often embedded deeply within the cell wall structure, these molecules anchor other components at the cell surface. Chitin-directed organization of the cell wall layers allows the fungal cell to effectively monitor and interact with the external environment. For fungal pathogens, this interaction includes maintaining cellular strategies ...
Source: Current Topics in Microbiology and Immunology - Category: Microbiology Tags: Curr Top Microbiol Immunol Source Type: research
Publication date: Available online 6 December 2019Source: Antiviral ResearchAuthor(s): Andrew M. Skidmore, Robert S. Adcock, Colleen B. Jonsson, Jennifer E. Golden, Dong-Hoon ChungAbstractVenezuelan equine encephalitis virus (VEEV) is an alphavirus that is endemic to the Americas. VEEV outbreaks occur periodically and cause encephalitis in both humans and equids. There are currently no therapeutics or vaccines for treatment of VEEV in humans. Our group has previously reported on the development of a benzamidine VEEV inhibitor, ML336, which shows potent antiviral activity in both in vitro and in vivo models of infection. In...
Source: Antiviral Therapy - Category: Virology Source Type: research
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