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Species specificity of iron delivery in hybridomas

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Summary

Studies with Human x Human (HxH), Human x Mouse (HxM), and Mouse x Mouse (MxM) hybridomas have enabled us to define specific factors that affect hybridoma growth in a species-specific manner. Three transferrins and three lipophilic iron chelates have been tested for their ability to support hybridoma proliferation and antibody production. The results of these studies demonstrate that HxH hybridomas do not respond to bovine transferrin a+ concentrations up to 100 μg/ml and are approximately 100-fold less responsive to mouse transferrin than to human transferrin. HxM and MxM hybridomas respond equally to human or mouse transferrin but are 100-fold less sensitive to bovine transferrin. An antibody to the human transferrin receptor inhibited the growth-promoting activity of human or mouse transferrin on HxH hybridomas but was ineffective on HxM hybridomas. This semonstrated the functionality of the human transferrin receptor in HxH hybridomas and that human, mouse, and bovine transferrin were interacting through the mouse transferrin receptor in HxM hybridomas. HxH and HxM hybridomas respond similarly to three different iron chelates exhibiting 80 to 110% of the growth response to human transferrin. MxM hybridomas fail to respond to the iron chelates at similar concentrations, suggesting that the human genome present in the other hybridoma species confers a unique ability for utilizing iron when delivered in this form.

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Authors and Affiliations

  1. Department of In Vitro Antibody Production, Hybritech, Inc., 11085 Torreyana Road, 92121, San Diego, California

    Charles R. Ill, Tammy Brehm & Bjorn K. Lydersen

  2. Department of Cell Biology, Hybritech, Inc., 11085 Torreyana Road, 92121, San Diego, California

    Rachel Hernandez & Karen G. Burnett

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  1. Charles R. Ill
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  2. Tammy Brehm
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Ill, C.R., Brehm, T., Lydersen, B.K. et al. Species specificity of iron delivery in hybridomas. In Vitro Cell Dev Biol 24, 413–419 (1988). https://doi.org/10.1007/BF02628492

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