| First Author | Houghton FD | Year | 1996 |
| Journal | Mol Hum Reprod | Volume | 2 |
| Issue | 10 | Pages | 793-8 |
| PubMed ID | 9239698 | Mgi Jnum | J:44375 |
| Mgi Id | MGI:1100016 | Doi | 10.1093/molehr/2.10.793 |
| Citation | Houghton FD, et al. (1996) Expression and activity of hexokinase in the early mouse embryo. Mol Hum Reprod 2(10):793-8 |
| abstractText | The maximal activity and Michaelis constant, KM, of hexokinase have been measured in the peri-implantation mouse embryo using an ultramicrofluorescence technique. In addition, transcript detection of the predominant isoenzyme hexokinase I has been determined in single preimplantation mouse embryos at successive stages of development using reverse transcriptase-mediated cDNA amplification. Maximal hexokinase activity decreased dramatically peri-implantation, from 0.97 +/- 0.19 nmol/microgram protein/h at the blastocyst stage to 0.31 +/- 0.05 nmol/microgram protein/h on day 6.5. The KM remained relatively low and constant over this period (0.23-0.39 mM), indicating the absence of the hexokinase type IV isoenzyme. The pattern of hexokinase activity resembled that of glucose consumption suggesting a possible regulatory role for the enzyme during this period of development. Hexokinase I mRNA was detected in the oocyte and all preimplantation stages of development. The blastocyst polymerase chain reaction (PCR) product, when cloned and sequenced was found to be 98% homologous with mouse tumour hexokinase I. Taken together, these data suggest that the hexokinase gene is not under transcriptional control during early mouse embryo development but plays a significant role in the regulation of glucose consumption. A role for hexokinase in the phosphate-induced inhibition of early embryo development is also proposed. |
