Human Reproduction, Vol. 16, No. 1, 153-163,
January 2001
© 2001 European Society of Human Reproduction and Embryology
Evidence that glucose is not always an inhibitor of mouse preimplantation development in vitro
Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
A factorial experimental design was used to examine the effects of 16 combinations of four concentrations of glucose (0.20, 0.60, 1.8, 5.4 mmol/l) and four concentrations of potassium dihydrogen phosphate (KH2PO4; 0.05, 0.15, 0.45, 1.35 mmol/l) on the development in vitro of outbred CF1 mouse zygotes. Three responses were measured: (i) the number of zona-enclosed blastocysts; (ii) the number of blastocysts that started to hatch; and (iii) the total cell counts in the blastocysts. General linear modelling was used to estimate the most parsimonious two-dimensional concentration–response surfaces that represent the three responses to the different concentrations of glucose and KH2PO4. There were no significant interactions between the effects of glucose and KH2PO4 in all cases. Thus, the effects of glucose and phosphate are independent. No significant effects of glucose on blastocyst formation and the initiation of hatching were observed. Increasing the concentration of KH2PO4 inhibited slightly (
20%) the development of zygotes into blastocysts and the initiation of hatching. The slight inhibitory effects of KH2PO4 appeared to be due to the inhibition of the development of a few sensitive embryos. No significant effects of glucose and KH2PO4 were observed on the total cell counts.
Key words: embryo culture/glucose/mouse preimplantation development/phosphate
1 To whom correspondence should be addressed. E-mail: john_biggers{at}hms.harvard.edu
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