Media solutions and methods for cryopreservation and thawing of in vitro fertilization specimens
View Patent ↗A medium solution which will increase the growth, survival and ultimately the live birth rate of oocytes and embryos which have been or will be subjected to cryopreservation. The solution contains varied amounts of glucose, pyruvates, amino acids, vitamins K5 and C, antioxidants, fatty acids to supply the specimens with the chemical ingredients and uptake requirements required to recover and prosper during and after the cryopreservation process. The solution supplies nutrients to the specimens that will replenish depletion and damage to the specimens and their mitochondria, spindles and structural features, such as cell walls. One formulation addresses the additional requirements of frozen specimens as opposed to the current media solutions and methods which treat the un-frozen specimens the same as the frozen specimens when recovering them from cryopreservation.
1. A method of freezing or vitrifying an embryo or oocyte specimen or specimens for storage in liquid nitrogen, said method comprising;
a) removing said specimen or specimens from a culture medium and placing said specimen or specimens in a first rejuvenation medium comprising effective amounts of glucose, pyruvate, amino acids, vitamins K5 and C, antioxidants, and fatty acids sufficient to supply the specimen or specimens with chemical ingredients and uptake requirements required to recover and prosper during the cryopreservation process, said first rejuvenation medium being operative to supply nutrients which will protect from depletion and damage to said specimen or specimens and its or their mitochondria, spindles, and structural features during cryopreservation, said first rejuvenation medium being devoid of HEPES or MOPS;
b) removing said specimen or specimens from said first rejuvenation medium and placing said specimen or specimens into a second rejuvenation medium comprising effective amounts of glucose, pyruvate, amino acids, vitamins K5 and C, antioxidants, and fatty acids sufficient to supply the specimen or specimens with chemical ingredients and uptake requirements required to recover and prosper during the cryopreservation process, said second rejuvenation medium being operative to supply nutrients which will protect from depletion and damage to said specimen or specimens and its or their mitochondria, spindles, and structural features during cryopreservation, said second rejuvenation medium including HEPES or MOPS;
c) removing said specimen or specimens from said second rejuvenation medium and placing said specimen or specimens in a first solution comprising a first amount of one or more cryoprotectants;
d) removing said specimen or specimens from said first solution and placing said specimen or specimens in a second solution comprising a second amount of one or more cryoprotectants which is greater than said first amount of cryoprotectant in step c); and
e) removing said specimen or specimens from said second solution and placing said specimen or specimens in liquid nitrogen.
2. The method of claim 1 , wherein said fatty acids include lipoic acid and linoleic acid.
3. The method of claim 2 , wherein said lipoic acid is present in a concentration range of about 0.000004 g/L to about 0.000008 g/L.
4. The method of claim 2 , wherein said linoleic acid is present in a concentration range of about 0.0000025 g/L to about 0.000010 g/L.
5. A method of freezing or vitrifying an embryo or oocyte specimen for storage in liquid nitrogen, said method comprising;
a) removing said specimen from a culture medium and placing said specimen in a first rejuvenation medium comprising effective amounts of glucose, pyruvate, amino acids, vitamins K and C, antioxidants, and fatty acids sufficient to supply the specimen with chemical ingredients and uptake requirements required to recover and prosper during the cryopreservation process, said first rejuvenation medium being operative to supply nutrients which will protect from depletion and damage to said specimen and its mitochondria, spindles, and structural features during cryopreservation, said first rejuvenation medium being devoid of HEPES or MOPS;
b) removing said specimen from said first rejuvenation medium and placing said specimen into a second rejuvenation medium comprising effective amounts of glucose, pyruvate, amino acids, vitamins K and C, antioxidants, and fatty acids sufficient to supply the specimen with chemical ingredients and uptake requirements required to recover and prosper during the cryopreservation process, said second rejuvenation medium being operative to supply nutrients which will protect from depletion and damage to said specimen and its mitochondria, spindles, and structural features during cryopreservation, said second rejuvenation medium including HEPES or MOPS;
c) removing said specimen from said second rejuvenation medium and placing said specimen in a first solution comprising a first amount of one or more cryoprotectants;
d) removing said specimen from said first solution and placing said specimen in a second solution comprising a second amount of one or more cryoprotectants which is greater than said first amount of cryoprotectant in step c); and
e) removing said specimen from said second solution and placing said specimen in liquid nitrogen.