Sperm movement in the ooplasm, dithiothreitol pretreatment and sperm freezing are not required for the development of porcine embryos derived from injection of head membrane-damaged sperm
| Autor: | Byeong Chun Lee, Hwan Yul Yong, Ji Young Hong, Eunsong Lee, Sung Keun Kang, Woo Suk Hwang |
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| Rok vydání: | 2005 |
| Předmět: |
Male
Cytoplasm endocrine system Swine medicine.medical_treatment Embryonic Development Motility Intracytoplasmic sperm injection Andrology Human fertilization Food Animals medicine Animals Sperm Injections Intracytoplasmic Blastocyst Small Animals Cells Cultured reproductive and urinary physiology Sperm motility Cryopreservation urogenital system Equine Chemistry Embryogenesis Male pronucleus Sperm Culture Media Dithiothreitol medicine.anatomical_structure Oocytes Sperm Motility Female Animal Science and Zoology Semen Preservation |
| Zdroj: | Theriogenology. 63:783-794 |
| ISSN: | 0093-691X |
| Popis: | The present study investigated the correlation of sperm movement in the ooplasm, pretreatment of sperm with dithiothreitol (DTT) and sperm freezing with the development of porcine embryos derived from modified intracytoplasmic sperm injection (ICSI). In vitro, matured gilt oocytes without centrifugation were injected with head membrane-damaged spermatozoa aspirated tail-first. In Exp. 1, frozen-thawed sperm were categorized into three groups: impaired, immotile or motile. Oocytes injected with motile sperm (43.6%) showed a higher (P < 0.05) fertilization rate compared to oocytes injected with impaired or immotile sperm (34.5 or 37.2%). The survival rate was significantly higher (P < 0.05) in oocytes injected with impaired sperm (92.9%) than in oocytes injected with immotile or motile sperm (84.8 or 86.7%). No differences were observed in the rates of cleavage or blastocyst formation, and in total cell number of blastocysts among three groups of oocytes. In Exp. 2, motile frozen-thawed sperm were pretreated with DTT before injection and non-treated sperm served as controls. Higher rates (P < 0.05) of fertilization, male pronucleus (MPN) and decondensed sperm head (DSH) formation were observed in oocytes injected with control sperm (41.1, 50.0 and 91.1%, respectively) than in oocytes injected with DTT-treated sperm (22.1, 30.2 and 72.1%, respectively). No differences in embryo development and total cell number of blastocysts were observed between two groups of oocytes. In Exp. 3, motile frozen-thawed or fresh sperm without DTT pretreatment were injected into oocytes. The rates of fertilization and MPN formation were significantly higher (P < 0.05) in oocytes injected with fresh sperm (59.8 and 73.5%) than in oocytes injected with frozen-thawed sperm (36.7 and 59.2%). No differences in embryo development and total cell number of blastocysts were observed between two groups of oocytes. In conclusion, the present study clearly demonstrated that sperm movement in the ooplasm, use of DTT and fresh spermatozoa did not significantly affect on embryo development in porcine modified ICSI. |
| Databáze: | OpenAIRE |
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