Abstract
Purpose
To determine the composition of commercially available protein supplements for embryo culture media and test if differences in protein supplement composition are biologically relevant in a murine model.
Methods
Amino acid, organic acid, ion and metal content were determined for 6 protein supplements: recombinant human albumin (AlbIX), human serum albumin (HSA and Buminate), and three complex protein supplements (SSS, SPS, LGPS). To determine if differences in the composition of these supplements are biologically relevant, mouse one-cell embryos were collected and cultured for 120 hours in each protein supplement in Global media at 5 and 20 % oxygen in an EmbryoScope time-lapse incubator. The compositions of six protein supplements were analyzed for concentrations of 39 individual amino acids, organic acids, ions and elements. Blastocyst development and cell cycle timings were calculated at 96-hours of culture and the experiments were repeated in triplicate. Blastocyst gene expression was analyzed.
Results
Recombinant albumin had the fewest undefined components , the lowest concentration of elements detected, and resulted in high blastocyst development in both 5 and 20 % oxygen. Buminate, LGPS and SPS had high levels of transition metals whereas SSS had high concentrations of amino acids. Pre-compaction mouse embryo development was delayed relative to embryos in AlbIX for all supplements and blastocyst formation was reduced in Buminate, SPS and SSS.
Conclusions
The composition of protein supplements are variable, consisting of previously undescribed components. High concentrations of pro-oxidant transition metals were most notable. Blastocyst development was protein dependent and showed an interaction with oxygen concentration and pro-oxidant supplements.

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Protein supplements for IVF and embryo culture are highly heterogeneous and poorly defined. Some components of supplements adversely affect mouse embryo development and these effects are dependent on oxygen concentration used for culture.
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Supplemental Figure 1
Specific cell division timings (hours; mean±se) from the 2-cell stage to 3-, 4-, 5- and 8 cells for embryos cultured with different protein supplements. Time to the 3-cell stage relative to AlbIX was longer for SPS (p<0.01) and Buminate and SSS (p<0.001). Time to 8-cell was delayed relative to AlbIX for Buminate, SSS, SPS and LGPS (p<0.01). (PPT 201 kb)
Supplemental Figure 2
Gene expression analyses, relative to 18s rRNA, for hatching mouse blastocysts cultured in 5 mg/mL AlbIX,10% Buminate, 5 mg/mL HSA, 10% LGPS, 10% SPS, or 10% SSS at 5% O2 compared to 20% O2. Positive fold changes indicate an increase in transcript abundance in embryos cultured at 20% O2 as compared to 5% O2, whereas a negative fold change indicates a decrease in transcript abundance in embryos cultured at 20% O2 as compared to 5% O2. *, P < 0.05; ‡, P < 0.1. (DOC 190 kb)
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Morbeck, D.E., Paczkowski, M., Fredrickson, J.R. et al. Composition of protein supplements used for human embryo culture. J Assist Reprod Genet 31, 1703–1711 (2014). https://doi.org/10.1007/s10815-014-0349-2
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DOI: https://doi.org/10.1007/s10815-014-0349-2