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Ion exchange chromatography of biotherapeutics: Fundamental principles and advanced approaches.
J Chromatogr A
February 2025
School of Pharmaceutical Sciences, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva 4, Switzerland. Electronic address:
Ion exchange chromatography (IEX) is an important analytical technique for the characterization of biotechnology-derived products, such as monoclonal antibodies (mAbs) and more recently, cell and gene therapy products such as messenger ribonucleic acid (mRNA) and adeno-associated viruses (AAVs). This review paper first outlines the basic principles and separation mechanisms of IEX for charge variant separation of biotherapeutics, and examines the different elution modes based on salt or pH gradients. It then highlights several recent trends when applying IEX for the characterization of biotechnology-derived products, including: i) the effective use of pH gradients, ii) the improvement of selectivity by using organic solvents in the mobile phase, multi-step gradients, or by combining ion pairing and ion exchange, and iii) the increase in analytical throughput using ultra-short columns or automated screening of conditions.
View Article and Find Full Text PDFDevelopment and optimization of an mRNA-vectored single-chain IgA1 isotype monoclonal antibody with potential to treat or prevent dengue virus infection.
Antiviral Res
February 2025
Department of Microbiology and Immunology, State University of New York Upstate Medical University, Syracuse, NY, 13210, USA; Institute for Global Health and Translational Sciences, State University of New York Upstate Medical University, Syracuse, NY, 13210, USA. Electronic address:
Dengue virus (DENV) is a rapidly expanding infectious disease threat that causes an estimated 100 million symptomatic infections every year. A barrier to preventing DENV infections with traditional vaccines or prophylactic monoclonal antibody (mAb) therapies is the phenomenon of Antibody-Dependent Enhancement (ADE), wherein sub-neutralizing levels of DENV-specific IgG antibodies can enhance infection and pathogenesis rather than providing protection from disease. Fortunately, IgG is not the only antibody isotype capable of binding and neutralizing DENV, as DENV-specific IgA1 isotype mAbs can bind and neutralize DENV while without exhibiting any ADE activity.
View Article and Find Full Text PDFCRISPR/Cas13X-assisted programmable and multiplexed translation regulation for controlled biosynthesis.
Nucleic Acids Res
January 2025
Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, No. 1800, Lihu Avenue, Binhu District, Wuxi 214122, China.
Developing efficient gene regulation tools is essential for optimizing microbial cell factories, but most existing tools only modulate gene expression at the transcriptional level. Regulation at the translational level provides a faster dynamic response, whereas developing a programmable, efficient and multiplexed translational regulation tool remains a challenge. Here, we have developed CRISPRi and CRISPRa systems based on hfCas13X that can regulate gene translation in Bacillus subtilis.
View Article and Find Full Text PDFDescriptive Epidemiology of Soil-Transmitted Helminth Infections in the United States: Using Big Data to Characterize Patients and Analyze Parasitic Disease Trends.
Pathogens
December 2024
Parasitology & Vector Biology (PARAVEC) Laboratory, School of Public Health, University of Nevada, Las Vegas, NV 89154, USA.
Soil-transmitted helminths (STH) include species responsible for hookworm disease, ascariasis, and trichuriasis. In the United States, STH infections have been greatly reduced with anthelmintic medications and improved hygiene and sanitation, however, cases still regularly occur, but limited epidemiological data exist. We investigated the occurrence of STH infections using big-data analytics of inpatient medical discharge records (1998-2020).
View Article and Find Full Text PDFLIN28A-dependent lncRNA NEAT1 aggravates sepsis-induced acute respiratory distress syndrome through destabilizing ACE2 mRNA by RNA methylation.
J Transl Med
January 2025
Emergency Department, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510630, China.
Background: Acute respiratory distress syndrome (ARDS) is a life-threatening and heterogeneous disorder leading to lung injury. To date, effective therapies for ARDS remain limited. Sepsis is a frequent inducer of ARDS.
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