Evaluation of mouse preimplantation embryos cultured in media enriched with insulin-like growth factors I and II, epidermal growth factor and tumor necrosis factor alpha.

Culture of preimplantation embryos is complex and requires strictly defined culture media to sustain their viability and quality. In the current study, an effort was made to evaluate comprehensively the quality of mice embryos, grown in media enriched with IGF I, IGF II, EGF and TNFalpha. For that purpose, critically chosen and thoroughly described, complex morphological methods based on contrast-phase, fluorescent and confocal microscopy were used. The study evaluated blastulation and hatching rates, total blastocyst cells, inner cell mass cell numbers (differential staining) as well as identified embryo cells with positive reactions for necrosis or apoptosis (TUNEL). The critical evaluation of the effects of the studied cytokines allowed for simultaneous, meticulous assessment of the applied study methods. Significantly more blastocysts were found in culture media enriched with IGF-I, IGF II and EGF. Significantly more hatched blastocysts were found in media with IGF-I and IGF II. Additionally, IGF I and II increased inner cell mass and total blastocyst cell numbers. Very few cells with necrosis and apoptosis were found in the culture media enriched with IGF I, IGF II and EGF. TNFalpha produced negative effects. The observed effects were dose-dependent.