Establishment of a human somatic hybrid cell line for recombinant protein production

J Biomed Sci. 2002 Nov-Dec;9(6 Pt 2):631-8. doi: 10.1159/000067294.


Cell fusion techniques were used to derive mammalian host cell lines suitable for large-scale production of therapeutic proteins. Although the 293S cell line, of human embryonic kidney origin, is an excellent host cell for mammalian gene expression, these cells have a tendency to form large and tight aggregates in suspension cultures and bioreactors. To solve the problem of aggregation, 293S cells were fused to a human suspension cell line, 2B8 (a Burkitt's lymphoma derivative), using polyethylene glycol (PEG). The PEG-treated 293S and 2B8 cells were selected in a medium supplemented with hypoxanthine-aminopterin-thymidine and G418 (1 mg/ml) to eliminate nonfused cells. These hybrid clones, designated as HKB (hybrid of kidney and B cells), are negative for endogenous immunoglobulin expression. Most clones are readily adaptable to serum-free suspension culture under shaking conditions without forming large and tight aggregates. One clone, HKB11, was shown to support high-level expression of cytokines [interleukin (IL)-2 and IL-4], ICAM-1 and rFVIII in a side-by-side comparison with 293 and Chinese hamster ovary cells. The above-described characteristics of HKB cells indicate that HKB11 is a favorable cell host for the production of human therapeutic proteins.

MeSH terms

  • Burkitt Lymphoma / pathology
  • Cell Aggregation
  • Cell Culture Techniques / methods
  • Cell Fusion / methods
  • Cytokines / biosynthesis
  • Gene Expression
  • Humans
  • Hybrid Cells*
  • Immunoglobulins / analysis
  • Kidney / cytology
  • Recombinant Proteins / biosynthesis*


  • Cytokines
  • Immunoglobulins
  • Recombinant Proteins