Influence of epidermal growth factor on mammalian oocyte maturation via tyrosine-kinase pathway

P. L. Lorenzo, Irwin Liu, J. C. Illera, R. A. Picazo, G. F. Carneiro, M. J. Illera, Alan J Conley, A. C. Enders, M. Illera

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Epidermal growth factor (EGF) has been reported to promote different functions in mammalian ovaries, including oocyte maturation. The aim of the present study was to establish: that EGF influences oocyte maturation in ovine and equine, that a tyrosine kinase-dependent intracellular mechanism mediates EGF effect and, that EGF-R receptor is detectable in ovarian follicles by immunohistochemistry methods. Selected ovine and equine oocytes were aspirated from 2-5 mm (ovine) or 25 mm (equine) follicles and cultured in TCM 199 for 22 (ovine) or 36 hours (equine). They are then subjected to culture with EGF and two specific tyrosine-kinase inhibitors (TKIs, tyrphostins A-23 y A-47). Maturation was determined as the percentage of oocytes at metaphase II stage after culture. Treatments with EGF significantly increased incidences of metaphase II stage compared to controls (86.2% vs. 55% and 70.4% vs. 22.5% in ovine and equine oocytes, respectively). Tyrphostins A-23 and A-47 were effective in suppressing EGF-effect on oocytes. EGF-receptor was local-ized in follicles, being more prominent in cumulus and granulosa cells. These results confirm that EGF has a physiological role in the regulation of oocyte maturation via tyrosine-kinase pathway.

Original languageEnglish (US)
Pages (from-to)15-22
Number of pages8
JournalJournal of Physiology and Biochemistry
Volume57
Issue number1
StatePublished - Mar 2001

Fingerprint

Epidermal Growth Factor
Protein-Tyrosine Kinases
Oocytes
Horses
Sheep
Tyrphostins
Metaphase
Epidermal Growth Factor Receptor
Cumulus Cells
Ovarian Follicle
Ovary
Immunohistochemistry
Incidence

Keywords

  • EGF
  • Oocyte
  • Tyrosine-kinase inhibitors
  • Tyrphostins

ASJC Scopus subject areas

  • Biochemistry
  • Physiology

Cite this

Lorenzo, P. L., Liu, I., Illera, J. C., Picazo, R. A., Carneiro, G. F., Illera, M. J., ... Illera, M. (2001). Influence of epidermal growth factor on mammalian oocyte maturation via tyrosine-kinase pathway. Journal of Physiology and Biochemistry, 57(1), 15-22.

Influence of epidermal growth factor on mammalian oocyte maturation via tyrosine-kinase pathway. / Lorenzo, P. L.; Liu, Irwin; Illera, J. C.; Picazo, R. A.; Carneiro, G. F.; Illera, M. J.; Conley, Alan J; Enders, A. C.; Illera, M.

In: Journal of Physiology and Biochemistry, Vol. 57, No. 1, 03.2001, p. 15-22.

Research output: Contribution to journalArticle

Lorenzo, PL, Liu, I, Illera, JC, Picazo, RA, Carneiro, GF, Illera, MJ, Conley, AJ, Enders, AC & Illera, M 2001, 'Influence of epidermal growth factor on mammalian oocyte maturation via tyrosine-kinase pathway', Journal of Physiology and Biochemistry, vol. 57, no. 1, pp. 15-22.
Lorenzo, P. L. ; Liu, Irwin ; Illera, J. C. ; Picazo, R. A. ; Carneiro, G. F. ; Illera, M. J. ; Conley, Alan J ; Enders, A. C. ; Illera, M. / Influence of epidermal growth factor on mammalian oocyte maturation via tyrosine-kinase pathway. In: Journal of Physiology and Biochemistry. 2001 ; Vol. 57, No. 1. pp. 15-22.
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