We are analyzing https://link.springer.com/article/10.1007/bf01675415.

Title:
Age-related changes of glucose-6-phosphate dehydrogenase activity in mouse oocytes | Journal of Molecular Histology
Description:
Glucose-6-phosphate dehydrogenase (G6PDH) activity was measured in follicular oocytes and in ovulated eggs of prepubertal, adult and aged mice. G6PDH activity in ovulated eggs was 60% of the activity in follicular oocytes in all age groups. The mean G6PDH activity was significantly higher in follicular oocytes of adult mice than in oocytes of both prepubertal and aged mice. In aged mice, the decreased mean activity in follicular oocytes as well as in ovulated eggs was mainly due to a high percentage of cells with extremely low activity (25 and 18%, respectively). The percentage of preovulatory oocytes with low activity in prepubertal mice was 9% and in adult mice 0.3%. For ovulated eggs these percentages were 0% for both prepubertal and adult mice. In every age group, all ovulated eggs showed a normal morphology. When ovulated eggs with extremely low G6PDH activity can still be fertilized, it can be questioned whether this loss of activity could cause disturbances in development of (preimplantation) embryos. Our findings emphasize the potentialities of investigating intact single oocytes for changes in enzyme activities, which could be applied as parameters for ‘quality control’ of these cells.
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Keywords {🔍}

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Topics {✒️}

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Questions {❓}

Can peri-ovulatory putrescine supplementation improve egg quality in older infertile women?

Schema {🗺️}

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         description:Glucose-6-phosphate dehydrogenase (G6PDH) activity was measured in follicular oocytes and in ovulated eggs of prepubertal, adult and aged mice. G6PDH activity in ovulated eggs was 60% of the activity in follicular oocytes in all age groups. The mean G6PDH activity was significantly higher in follicular oocytes of adult mice than in oocytes of both prepubertal and aged mice. In aged mice, the decreased mean activity in follicular oocytes as well as in ovulated eggs was mainly due to a high percentage of cells with extremely low activity (25 and 18%, respectively). The percentage of preovulatory oocytes with low activity in prepubertal mice was 9% and in adult mice 0.3%. For ovulated eggs these percentages were 0% for both prepubertal and adult mice. In every age group, all ovulated eggs showed a normal morphology. When ovulated eggs with extremely low G6PDH activity can still be fertilized, it can be questioned whether this loss of activity could cause disturbances in development of (preimplantation) embryos. Our findings emphasize the potentialities of investigating intact single oocytes for changes in enzyme activities, which could be applied as parameters for ‘quality control’ of these cells.
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         Developmental Biology
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