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In this study, we report a total of 292 mouse embryos cultured on Vero cell monolayers and 77 embryos cultured in medium alone at different preimplantation stages examined individually for embryonic mRNA of beta-actin, interleukin-1beta (IL-1beta), interleukin-1 receptor antagonist (icIL-1ra) and interleukin-1 receptor type I (IL-1RtI) using reverse transcription and two-step polymerase chain reaction (RT-PCR). The rates of blastocyst formation and blastocyst hatching were both significantly higher in embryos co-cultured with Vero cells in comparison with the embryos cultured in control medium (81.2 +/- 2.6 versus 42.2 +/- 3.7%, P &lt; 0.001; 75.6 +/- 2.7 versus 19.2 +/- 6.2%, P &lt; 0.001 respectively). We have identified a similar pattern of interleukin-1 family embryonic mRNA transcripts expressed from the compact morula stage through to hatching blastocyst in both control and Vero cell cultured embryos with significantly increased icIL-1ra transcript at hatching blastocyst stage (P &lt; 0.05, P &lt; 0.001 respectively). There was a significant increase in IL-1beta mRNA transcripts of embryos at hatching blastocyst stage compared to compact morula stage in Vero cell cultured embryos (P &lt; 0.05). These findings support the hypothesis that the IL-1 system is an important factor in embryo-maternal molecular communication during the implantation process.

human reproduction

Use of reverse transcription-polymerase chain reaction to detect embryonic interleukin-1 system messenger RNA in individual preimplantation mouse embryos co-cultured with Vero cells