Effects of Relaxin and Insulin on Porcine Granulosa-lutein Cell Steroidogenesis In Vitro

체외에서 돼지 황체화 과립막세포의 스테로이드 호르몬 생산에 미치는 Relaxin과 Insulin의 영향

  • Lee M. S. (College of Veterinary Medicine, Seoul National University) ;
  • Hossein M. S. (College of Veterinary Medicine, Seoul National University) ;
  • Lee C. K. ;
  • Kang S. K. (College of Veterinary Medicine, Seoul National University) ;
  • Lee B. C. (College of Veterinary Medicine, Seoul National University) ;
  • Hwang W. S. (College of Veterinary Medicine, Seoul National University)
  • 이명섭 (서울대학교 수의과대학) ;
  • ;
  • 이창규 (서울대 농업생명과학대학) ;
  • 강성근 (서울대학교 수의과대학) ;
  • 이병천 (서울대학교 수의과대학) ;
  • 황우석 (서울대학교 수의과대학)
  • Published : 2005.04.01

Abstract

To investigate the influence of relaxin and insulin on the ovarian steroid secretion of porcine granulosa cells, we used porcine granulosa cells partially luteinized in a primary culture and examined the production of progesterone and $17{\beta}-estradiol$. Porcine granulosa cells were cultured in the presence of serum for 48 h after attachment and subsequently in the absence of serum fur 24 h. To confirm the dose dependency of relaxin or insulin, various concentrations (10, 100, 1000 ng/ml) of relaxin or insulin were added in the medium for the last 24 h, respectively. To investigate the combinational effect of relaxin and insulin, 100 ng/ml relaxin and/or 100 ng/ml insulin were added in the medium for the last 24 h in the presence or absence of luteinizing hormone (100 ng/ml). The medium was collected and used for radioimmunoassay to measure the production of progesterone and $17{\beta}-estradiol$. Relaxin or insulin increased the production of progesterone by dose dependency, respectively while they had no effect of the production of $17{\beta}-estradiol$. Relaxin (100 ng/ml) and/or insulin (100 ng/ml) significantly increased the production of progesterone in the presence of luteinizing hormone while they had no effect of the production of $17{\beta}-estradiol$. In conclusion, relaxin and/or insulin increased the progesterone secretion of porcine granulosa-lutein cells in vitro while had no effect on the production of $17{\beta}-estradiol$ and had no synergism on the effects. The effects of relaxin and/or insulin on the production of progesterone were augmented by the presence of luteinizing hormone.

Relaxin과 insulin이 돼지 난포 과립막세포의 스테로이드 호르몬 분비에 미치는 영향을 연구하기위하여 체외에서 황체화된 과립막세포에서 prosesterone과 $17{\beta}-estradiol$의 생산을 조사하였다. 돼지난포 과립막세포를 혈청 존재하에 배양접시에 부착 후 48시간 동안 체외배양하고 무혈청 배지에서 24시간 배양하였다. Relaxin과 insulin의 용량의존성을 확인하기 위하여 다양한 농도 (10, 100, 1,000 ng/ml)를 각각 무혈청 배지에 첨가하였다. 병합 효과를 알아보기 위하여 100 ng/ml relaxin과 100 ng/ml insulin을 단독 혹은 병합하여 처리하였는데 황체호르몬 (100 ng/ml)을 처리한 경우와 처리하지 않은 경우 모두를 조사, 분석하였다. 최종 배양이 끝난 배양액을 수집하여 RIA법으로 proses-terone과 $17{\beta}-estradiol$의 농도를 조사하였다. Relaxin과 insulin은 용량이 증가될수록 progesterone의 생산을 증가시켰으나 $17{\beta}-estradiol$의 생산에는 아무런 영향이 없었다. 병합실험에서는 relaxin과 insulin 단독 또는 병합시 황체호르몬 존재 하에서 progesterone의 생산을 증가시켰으나 $17{\beta}-estradiol$의 생산에는 아무런 영향이 없었다. 결론적으로 relaxin과 insulin은 돼지 황체화 과립막세포의 progesterone 분비를 증가시키지만 $17{\beta}-estradiol$의 생산에는 효과가 없었으며 병합에 의한 상승효과는 없었다. Progesterone 생산에 미치는 relaxin과 insulin의 효과는 황체호르몬의 존재에 의해 증대되었다.

Keywords

References

  1. Bani D, Masini E, Bello MG, Bigazzi M and Sacchi TB. 1995. Relaxin activates the Larginine-nitric oxide pathway in human breast cancer cells. Cancer Research, 55:5272-5275
  2. Banisacchi T, Bigazzi M, Bani D, Mannaioni PF and Masini E. 1995. Relaxin-induced increased coronary flow through stimulation of nitric oxide production. Brit. J. Pharmacol., 116:1589-1594 https://doi.org/10.1111/j.1476-5381.1995.tb16377.x
  3. Cheah SH, Ng KH, Jongalingam VT and Ragavan M. 1995. The effects of oestradiol and relaxin on extensibility and collagen organisation of the pregnant rat cervix. J. Endocrinol., 146:331-337 https://doi.org/10.1677/joe.0.1460331
  4. Denkova RTz, Zvetkova EB, Martinova IS and Christov IA. 1998. Endocrine Regulation, 32:33-41
  5. Hansel W, Alita HW, Dowd JP and Yang X. 1987. Control of steroidogenesis in small and large luteal cells. Austral J. Biol. Sci., 40:331-347 https://doi.org/10.1071/BI9870331
  6. Havelock JC, Rainey WE and Carr BR. 2004. Ovarian granulosa cell lines. Mol. Cell. Endocrinol., 228:67-78 https://doi.org/10.1016/j.mce.2004.04.018
  7. Jarrett JC, Ballejo G, Saleem TH, Tsibris JM and Spellacy WN. 1984. The effect of prolactin and relaxin on insulin binding by adipocytes from pregnant women. Am. J. Obstet. Gynecol., 149:250-255 https://doi.org/10.1016/0002-9378(84)90223-0
  8. Lavoie HA, Garmey JC and Veldhuis JD. 1999. Mechanisms of insulin-like growth factor I augmentation of follicle-stimulating hormoneinduced porcine steroidogenic acute regulatory protein gene promotor activity in granulosa cells. Endocrinology, 140:146-153 https://doi.org/10.1210/en.140.1.146
  9. McGovern PG, Goldsmith LT, Schmidt CL, Von Hagen C, Linden M and Weiss G. 1992. Effects of endothelin and relaxin on rat uterine segment contractility. Biol, Reprod., 46:680-685 https://doi.org/10.1095/biolreprod46.4.680
  10. Murphy BD and Dobias M. 1999. Down-regulation of follicle-stimulating hormone receptor mRNA by homologous and heterologous ligands during luteinization of porcine granulosa cells. Mol. Reprod. Dev., 53:198-207 https://doi.org/10.1002/(SICI)1098-2795(199906)53:2<198::AID-MRD9>3.0.CO;2-K
  11. Olefsky JM, Sackow M and Kroc RL. 1982. Potentiation of insulin binding and insulin action by purified porcine relaxin. Ann. NY. Acad. Sci., 380:200-215 https://doi.org/10.1111/j.1749-6632.1982.tb18043.x
  12. Pawlina W, Larkin LH and Frost SC. 1989. Effect of relaxin on differentiation of 3T3-L1 preadipocyte. Endocrinology, 125:2049-2055 https://doi.org/10.1210/endo-125-4-2049
  13. Pescador N, Stocco DM and Murphy BD. 1999. Growth factor modulation of steroidogenic acute regulatory protein and luteinization in the pig ovary. Biol. Reprod., 60:1453-1461 https://doi.org/10.1095/biolreprod60.6.1453
  14. Schwabe C and McDonald JK. 1977. Relaxin: a disulfide homolog of insulin. Science, 197:914-915 https://doi.org/10.1126/science.887933
  15. Sekar N, Garmey JC and Veldhuis JD. 2000. Mechanisms underlying the steroidogenic synergy of insulin and luteinizing hormone in porcine granulosa cells: joint amplication of pivotal sterol-regulatory genes encoding the low-density lipoprotein (LDL) receptor, steroidogenic acute regulatory (StAR) protein and cytochrome P450 side-chain cleavage (P450 sec) enzyme. Mol. Cell. Endocrinol., 159:25-35 https://doi.org/10.1016/S0303-7207(99)00203-8
  16. Zang Q and Bagnell CA. 1993. Relaxin stimulation of porcine granulosa cell deoxyribonucleic acid synthesis in vitro: Interaction with insulin-like growth factor I. Endocrinology, 132:1643-1650 https://doi.org/10.1210/en.132.4.1643
  17. Zang Q and Bagnell CA. 1994. Trophic actions of relaxin on porcine theca cells: Interactions with insulin and insulin-like growth factor-I in vitro. Endocrine J., 2:349-355