Identification of Insulin-Like Growth Factor I in Bovine Seminal Plasma and Its Receptor on Spermatozoa: Influence on Sperm Motility1
| Autor: | Sandra L. Gray, Donald M. Henricks, Andrew J. Kouba, Brett R. Lackey, William R. Boone |
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| Rok vydání: | 1998 |
| Předmět: |
endocrine system
medicine.medical_specialty urogenital system medicine.medical_treatment Motility Semen Cell Biology General Medicine Biology Sperm Electroejaculation Insulin-like growth factor Endocrinology Human fertilization Reproductive Medicine Internal medicine medicine Centrifugation reproductive and urinary physiology Sperm motility |
| Zdroj: | Biology of Reproduction. 59:330-337 |
| ISSN: | 1529-7268 0006-3363 |
| Popis: | Insulin-like growth factor I (IGF-I) has been identified in human seminal plasma. This study was conducted to determine whether IGF-I is present in bovine seminal plasma, whether sperm cells express the IGF-I receptor (IGF-IR), and whether IGF-I affects sperm motility. Semen samples were collected from bulls by electroejaculation and maintained at 378C, and motility of sperm was assessed. After centrifugation to separate sperm cells from seminal plasma, the seminal plasma was submitted to a validated heterologous RIA for IGF-I. Significant concentrations of IGF-I (116.29 6 40.83 ng/ml expressed as mean 6 SD) were measured in bovine seminal plasma. Sperm cells were washed with buffer and subjected to either radioreceptor assay (RRA) or immunocytochemistry (IC). RRA revealed a single high affinity for the IGF-IR with a Kd of 0.83 nM as determined by the computer program LIGAND. IC, using three monoclonal antibodies, localized the IGF-IR to the acrosomal region of the sperm. Computer-assisted sperm-motion analysis was used to determine the effects of IGF-I and IGF-II on bovine sperm motility parameters. Both IGF-I and IGF-II increased sperm motility and straight-line velocity (p , 0.05) relative to the control. The presence of IGF-IR on sperm, the presence of IGF-I in semen, and the ability of IGF-I to stimulate sperm motility provide evidence that the IGF system may be involved in the fertilization process in the bovine species. |
| Databáze: | OpenAIRE |
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