IVF of mouse ova in a simplex optimized medium supplemented with amino acids

Area of Science:

• Reproductive Biology
• Developmental Biology
• Biochemistry

Background:

• Optimized culture media are crucial for in vitro fertilization (IVF) and preimplantation embryo development.
• Modified Simplex Optimized Medium (mKSOM) is a widely used medium for mouse embryo culture.
• The role of amino acids as osmolytes in improving embryo development requires further investigation.

Purpose of the Study:

• To investigate the effect of amino acid supplementation on mouse zygote and blastocyst development in vitro.
• To determine if amino acids in the culture medium alleviate osmotic stress on early-stage embryos.
• To assess the potential benefits for human IVF and mouse strain recovery.

Main Methods:

• CF1 mouse ova were fertilized in vitro and cultured in modified Simplex Optimized Medium (mKSOM) with or without amino acid supplementation.
• Developmental parameters assessed included blastocyst formation rate, hatching rate, and cell number (total and inner cell mass).
• Extracellular matrix organization was also evaluated in developed blastocysts.

Main Results:

• Amino acid supplementation did not increase the percentage of blastocysts formed.
• However, supplementation significantly increased the percentage of blastocysts that hatched and the total cell number, particularly within the inner cell mass.
• A more organized extracellular matrix was observed in blastocysts cultured in amino acid-supplemented medium.

Conclusions:

• Amino acid-supplemented mKSOM enhances mouse blastocyst development, indicated by improved hatching and cell proliferation.
• Amino acids may alleviate osmotic stress on zygotes and early embryos, thereby increasing developmental potential.
• These findings suggest potential applications for human IVF and the recovery of mouse strains using cryopreserved spermatozoa.