Pig blastocyst development in vitro is affected by amino acids

Area of Science:

• Reproductive Biology
• Developmental Biology
• Animal Science

Background:

• Optimizing in vitro culture conditions is crucial for successful early embryonic development.
• Nutrient availability, particularly amino acids, significantly impacts embryo growth and viability.
• Understanding specific amino acid requirements can improve assisted reproductive technologies in swine.

Purpose of the Study:

• To investigate the effects of supplemental amino acids (glutamine, phenylalanine, methionine, isoleucine) on pig embryo development in vitro.
• To determine the impact of these amino acids on embryo volume and hatching frequency.
• To evaluate nutrient requirements for pig embryos cultured in both serum-supplemented and serum-free media.

Main Methods:

• Pig embryos were cultured in modified Krebs-Ringer bicarbonate (mKRB) medium.
• Experiments involved supplementation with heat-inactivated lamb serum (LS), individual or combined amino acids (glutamine, phenylalanine, methionine, isoleucine).
• Embryo volume and hatching initiation were measured to assess developmental progression.

Main Results:

• Supplementation with phenylalanine, methionine, and isoleucine increased embryo volume and hatching frequency.
• Glutamine supplementation alone, in serum-free media, increased blastocyst volume.
• Conversely, glutamine in combination with other amino acids in serum-supplemented media depressed embryo volume.

Conclusions:

• Specific amino acids, particularly phenylalanine and methionine, are essential for promoting pig embryo growth and hatching.
• Glutamine's effect on embryo development is context-dependent, showing benefits in serum-free conditions but potential inhibition in serum-supplemented media.
• Tailoring amino acid profiles in culture media can significantly enhance in vitro pig embryo development.