Removal of minute virus of mice-mock virus particles by nanofiltration of culture growth medium supplemented with 10% human platelet lysate

Lassina Barro, Liling Delila, Ouada Nebie, Yu Wen Wu, Folke Knutson, Naoto Watanabe, Masayasu Takahara, Thierry Burnouf

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Background aims: Platelet concentrates (PCs) are pooled to prepare human platelet lysate (HPL) supplements of growth media to expand primary human cells for transplantation; this increases the risk of contamination by known, emerging, and unknown viruses. This possibility should be of concern because viral contamination of cell cultures is difficult to detect and may have detrimental consequences for recipients of cell therapies. Viral reduction treatments of chemically defined growth media have been proposed, but they are not applicable when media contain protein supplements currently needed to expand primary cell cultures. Recently, we successfully developed a Planova 35NPlanova 20N nanofiltration sequence of growth media supplemented with two types of HPL. The nanofiltered medium was found to be suitable for mesenchymal Stromal cell (MSC) expansion. Methods: Herein, we report viral clearance achieved by this nanofiltration process used for assessing a new experimental model using non-infectious minute virus of mice-mock virus particle (MVM-MVP) and its quantification by an immunoqPCR. Then, high doses of MVM-MVP (1012 MVPs/mL) were spiked to obtain a final concentration of 1010 MVPs/mL in Planova 35N-nanofiltered growth medium supplemented with both types of HPLs [serum converted platelet lysate SCPL) and intercept human platelet lysate (I-HPL)] at 10% (v/v) and then filtering through Planova 20N. Results: No substantial interference of growth medium matrices by the immune-qPCR assay was first verified. Log reduction values (LRVs) were ≥ 5.43 and ≥ 5.36 respectively, SCPL and I-HPL media. MVM-MVPs were also undetectable by dynamic light scattering and transmission electron microscopy. Conclusions: The nanofiltration of growth media supplemented with 10% HPL provides robust removal of small nonenveloped viruses, and is an option to improve the safety of therapeutic cells expanded using HPL supplements.

Original languageEnglish
Pages (from-to)902-907
Number of pages6
Issue number10
Publication statusPublished - Oct 2021


  • HPL
  • human platelet lysate
  • log reduction value
  • nanofiltration
  • viral clearance

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Oncology
  • Genetics(clinical)
  • Cell Biology
  • Transplantation
  • Cancer Research


Dive into the research topics of 'Removal of minute virus of mice-mock virus particles by nanofiltration of culture growth medium supplemented with 10% human platelet lysate'. Together they form a unique fingerprint.

Cite this