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Correlative imaging using super‐resolution fluorescence microscopy and soft X‐ray tomography at cryogenic temperatures provides a new way to assess virosome solutions for vaccine development

DOI: 10.1111/jmi.13054 DOI Help

Authors: Chidinma A. Okolo (Diamond Light Source) , Archana Jadhav (Diamond Light Source) , Patrick Phillips (Diamond Light Source) , Maud Dumoux (Rosalind Franklin Institute) , Amanda A. Mcmurray (Activirosomes Limited) , Vishwas D. Joshi (Activirosomes Limited; Seagull BioSolutions Private Limited) , Claire Pizzey (Diamond Light Source) , Maria Harkiolaki (Diamond Light Source)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Journal Of Microscopy

State: Published (Approved)
Published: August 2021
Diamond Proposal Number(s): 24622

Abstract: Active Virosomes (AVs) are derivatives of viruses, broadly similar to ‘parent’ pathogens, with an outer envelope that contains a bespoke genome coding for 4–5 viral proteins capable of eliciting an antigenic response. AVs are essentially novel vaccine formulations that present on their surface selected viral proteins as antigens. Once administered, they elicit an initial “anti-viral” immune response. AVs are also internalised by host cells where their cargo viral genes are used to express viral antigen(s) intracellularly. These can then be transported to the host cell surface resulting in a second wave of antigen exposure and a more potent immuno-stimulation. A new 3D correlative microscopy approach is used here to provide a robust analytical method for characterisation of Zika and Chikungunya-derivatised AV populations including vesicle size distribution and variations in antigen loading. Manufactured batches were compared to assess the extent and nature of batch-to-batch variations. We also show preliminary results that verify antigen expression on the surface of host cells. We present here a reliable and efficient high-resolution 3D imaging regime that allows the evaluation of the microstructure and biochemistry of novel vaccine formulations such as AVs.

Journal Keywords: vaccine; correlative microscopy; X-ray microscopy; high resolution; fluorescence; biomaterials; virosomes

Diamond Keywords: Viruses

Subject Areas: Biology and Bio-materials, Chemistry, Medicine


Instruments: B24-Cryo Soft X-ray Tomography

Added On: 02/08/2021 13:50

Discipline Tags:

Vaccines Pathogens Infectious Diseases Health & Wellbeing Biochemistry Technique Development - Life Sciences & Biotech Chemistry Drug Discovery Life Sciences & Biotech

Technical Tags:

Imaging Microscopy Tomography X-ray Microscopy Correlative Light X-ray Microscopy (CLXM) Cryo-soft X-ray Tomography (Cryo-SXT)