Changes in serum insulin-like growth factor-I (IGF-I), thyroxine and cortisol hormone levels during reproductive migration of female brood stocks of Persian sturgeon, Acipenser persicus

Editorial

Authors

1 Department of Fisheries Sciences, Faculty of Natural Resources, University of Kurdistan, Sanandaj

2 Department of Fisheries Sciences, Faculty of Natural Resources, University of Tehran, Karaj

3 Department of Medical Biotechnology, School of Medical Sciences, University of Tarbiat Modares, Tehran

4 Department of Marine Biology, Faculty of Biological Sciences, Shahid Beheshti University, G.C., Tehran

5 Department of Physiology, International Sturgeon Research Institute, Rasht

Abstract

In teleosts the insulin-like growth factor-I, a member of IGF system, play an important role in the control of growth and reproduction including metabolism, cell division, oogenesis, final oocyte maturation and secretory activity. This system is controlled by several hormones and metabolic status. Serum IGF-I, thyroxine (T4) and cortisol levels were studied in two female brood stocks (caught from sea and from river during their up stream migration) during their late stage of sex maturation. Blood samples were taken from 6 individual in each brood stocks, and at three ovarian developmental stages (brood stock capture, pituitary injection and artificial propagation) based on their polarization index (IP). A heterologous radioimmunoassay system which used polyclonal anti-human IGF-I and human IGF-I as antigen, was used for IGF-I serum measurements. T4 and cortisol concentrations were also measured by radioimmunoassay. Our results did not show significantly differences in IGF-I, T4 and cortisol levels between two brood stocks. However, in both brood stocks the mean IGF-I serum concentrations were higher in the second and third sampling stages than the first one (p<0.05). In the river brood stock, T4 serum level was significantly higher during ovulation than the second stage, but it was not observed in sea brood stock (p< 0.05). Cortisol serum levels had not showed significantly differences between three sampling stages in both brood stocks, except at second sampling in sea water brood. These results could provide evidence for a possible role of IGF-I during final oocyte maturation of Persian sturgeon. The up regulation of serum IGF-I may have a role in the resumption of meiotic arrest during late stage of sex maturation. However, we could not found any relationship between IGF-I, T4 and cortisol serum levels in both brood stocks.

References

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Veterinary Research & Biological Products
Volume 22, Issue 3 - Serial Number 3
September 2009
Pages 48-54

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  • Receive Date: 26 April 2015
  • Accept Date: 26 April 2015

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