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Porcine Granulosa Cells Produce Gonadotropin Surge Inhibiting Factor (GnSIF) Activity In Vitro
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KMID : 0358419990420122815
Abstract
¸ñÀû: ³úÇϼöü¿¡¼ ºÐºñµÇ´Â LH surge¸¦ ¾ïÁ¦ÇÏ´Â ¹°ÁúÀÇ Á¸Àç¿¡ ´ëÇÑ ¿¬±¸°¡ È°¹ßÇØ Áü¿¡ µû¶ó µÅÁö¿Í ¼ÒÀÇ ³Æ÷¾×À» ¿©·¯ Â÷·Ê »öÃþºÐ¼® ÇÏ¿© ÃßÃâµÈ ¾î¶² ´Ü¹éÁúÀÌ ¹è¾çµÈ ÁãÀÇ ³úÇϼöü Àü¿±¼¼Æ÷·ÎºÎÅÍ LH ºÐºñ¸¦ ¾ïÁ¦ÇÑ´Ù´Â »ç½ÇÀÌ ¹àÇôÁ³°í °ð GnSIF (Gonadotropin Surge Inhibiting Factor) ¶Ç´Â GnSAF (Gonadotropin Surge Attenuating Factor)·Î ¸í¸íµÇ¾ú´Ù. º» ¿¬±¸ÀÇ ¸ñÀûÀº µÅÁöÀÇ ³¼Ò °ú¸³¸·¼¼Æ÷¿¡¼ GnSIF¸¦ »ý¼ºÇÏ´Â °¡¸¦ ¾Ë¾Æº¸¸ç ³Æ÷±âÀÇ °¢ ½Ã±â¿¡ µû¸¥ GnSIF ºÐºñÁ¤µµÀÇ Â÷À̸¦ ¾Ë¾Æº¸±â À§ÇÑ °ÍÀÌ´Ù.
¿¬±¸¹æ¹ý ¹× Àç·á: 3±ºÀÇ °¢±â ´Ù¸¥ Å©±âÀÇ µÅÁö ³Æ÷·ÎºÎÅÍ ³Æ÷¾×À» õÀÚ ÇÏ¿© ¾ò¾îÁø °ú¸³¸·¼¼Æ÷¸¦ Ham¢¥s F-12/DMEM ¹è¾ç¾×À» ´ãÀº 24Ä ¹è¾çÆÇ¿¡ 3¹è¼ö·Î ÇÑ Ä´ç 500,000°³ÀÇ »ì¾ÆÀÖ´Â ¼¼Æ÷¸¦ ³Ö¾î 24½Ã°£ ¹è¾çÇÏ¿´´Ù. ¼¼Æ÷µéÀÌ ÂøÆÇ µÈ °ÍÀ» È®ÀÎÇÑ ÈÄ ¼¼Æ÷¸¦ EBSS (Earl¢¥s buffered saline solution)·Î ¼¼Ã´ÇÏ¿© 2% FBS¿Í 100ng/ml ³óµµÀÇ FSH¸¦ ÇÔÀ¯ÇÑ DMEM/F-12 ¹è¾ç¾×¿¡ 72½Ã°£ µ¿¾È ¹è¾çÇÑ ÈÄ °¢ ±ºÀÇ ¹è¾ç¾×À» ¼öÁýÇÏ¿´´Ù. ÀÌ ¹è¾ç¾×µéÀ» heparin-Sepharose·Î »öÃþºÐ¼® ÇÏ¿© inhibin°ú follistatinÀÇ È°¼ºÀ» Á¦°ÅÇÑ ÈÄ Áã ³úÇϼöü ¼¼Æ÷ »ýºÐ¼® (bioassay)À» ÀÌ¿ëÇÏ¿© °¢ ±ºÀÇ GnSIF È°¼ºÀ» ÃøÁ¤ÇÏ¿´´Ù. ¾î¸° ¾ÏÄÆ Sprague-Dawley ÁãÀÇ ³úÇϼöü¸¦ ºÐ¸®ÇÏ¿© 20% FBS, collagenase, hyaluronidase ±×¸®°í DNAse·Î ó¸®ÇÏ¿© ¼¼Æ÷¸¦ ºÐ»ê½ÃÄÑ 24Ä ¹è¾çÆÇ¿¡ Ä´ç 500,000°³ÀÇ »ì¾ÆÀÖ´Â ¼¼Æ÷ÀÇ ³óµµ·Î M199 ¹è¾ç¾à¿¡ 72½Ã°£ ¹è¾çÇÏ¿© ÂøÆÇ ½ÃŲ ÈÄ ¼¼Ã´ÇÑ µÚ 10nM/ml ³óµµÀÇ GnRH¿Í °¢ 3±ºÀÇ °ú¸³¸·¼¼Æ÷ ¹è¾ç¾×À» ÷°¡ÇÏ¿© 4½Ã°£ ¹è¾ç ÈÄ ¹è¾ç¾×À» ¼öÁýÇÏ¿© ÇÙ ¸é¿ª ºÐ¼®(RIA)À» ÅëÇØ LH ³óµµ¸¦ ÃøÁ¤ÇÏ¿´´Ù. À̶§ GnSIFÀÇ È°¼ºµµ´Â GnRH¿¡ ÀÇÇØ ÀÚ±ØµÈ ³úÇϼöü ¼¼Æ÷·ÎºÎÅÍ ºÐºñµÇ´Â LH°¡ 50% ¾ïÁ¦µÇ´Â °ÍÀ» 1´ÜÀ§(unit)·Î Á¤ÀÇÇÏ¿´´Ù.
°á°ú: ³¼Ò °ú¸³¸·¼¼Æ÷ ¹è¾ç¾×Àº GnRH¿¡ À¸ÇØ ÀÚ±ØµÈ ÁãÀÇ ³úÇϼöü ¼¼Æ÷ÀÇ LH ºÐºñ¸¦ ´ëÁ¶±ºÀÇ 69%¿¡¼ ¾ïÁ¦ÇÏ¿´°í (p<0.001, n=2), ÀÌ´Â FSH·Î °ú¸³¸·¼¼Æ÷¸¦ ÀÚ±ØÇÑ °á°ú dose dependent manner·Î ÀڱصǾú´Ù. Á÷°æ 1-3§® ÀÇ ³Æ÷·ÎºÎÅÍ ¼öÁýµÈ Ãʱ⠳Æ÷±âÀÇ °ú¸³¸·¼¼Æ÷ÀÇ ¹è¾ç¾×ÀÌ Á÷°æ 6§® ÀÌ»óÀÇ ³Æ÷·ÎºÎÅÍ ¼öÁýµÈ Èı⠳Æ÷±âÀÇ °ú¸³¸·¼¼Æ÷ÀÇ ¹è¾ç¾×º¸´Ù ³úÇϼöü ¼¼Æ÷ÀÇ LG ºÐºñ¸¦ ´õ¿í ¾ïÁ¦ÇÏ¿´´Ù.
°á·Ð: GnSIF È°¼ºÀº µÅÁö ³¼Ò °ú¸³¸·¼¼Æ÷ ¹è¾ç¾×¿¡ Á¸ÀçÇϸç ȲüÈ(Iutenization)°¡ µÇ±â ÀÌÀüÀÇ Ãʱ⠳Æ÷±âÀÇ °ú¸³¸·¼¼Æ÷°¡ GnSIF ºÐºñ¿¡ ´õ¿í Àû±ØÀûÀÌ´Ù. GnSIF´Â inhibin À̳ª follistatin°ú ´õºÒ¾î ³úÇϼöüÀÇ ¼º¼±ÀÚ±ØÈ£¸£¸óÀÇ ºÐºñ¸¦ Á¶ÀýÇÏ´Â Áß¿äÇÑ ³¼ÒÀÇ ºÐºñ ¹°ÁúÀÓÀ» ½Ã»çÇÑ´Ù.
Objectives: It has been identified a novel protein in porcine and bovine follicular fluid termed Gonadotropin Surge Inhibiting Factor (GnSIF) which inhibits GnRH-stimulated LH secretion by pituitary cells in culture. The purpose of this study was to investigate the production of GnSIF by porcine granulosa cell in vitro.
Materials and Methods: Granulosa cells were aspirated from different size of porcine follicles (1-3mm, 3-5mm, >6mm in diameter) and cultured in 24-well plates in Ham¢¥s F-12/DMEM at 500,000 cells/well for 24h. After plating, cells were washed and incubated in triplicate for 72h in DMEM/F-12 containing 2% FBS in the presence of 100ng/ml FSH and the media were collected. Granulosa cell-conditioned media were chromatographed on heparin-Sepharose to remove inhibin and follistatin, and assayed for GnSIF activity using a rat pituitary cell bioassay. Briefly, dispersed pituitary cells from adult female Sprague-Dawley rats were plated (500,000 cells/well) for 72h, washed, and incubated with granulosa cell-conditioned media in the presence of IOnM GnRH for 4h. The media were collected and assayed for LH by RIA. GnSIF activity is defined as the suppression of GnRH-stimulated LH secretion.
Results: Granulosa cell-conditioned media significantly inhibited GnRH-stimulated LH secretion by rat pituitary cells in vitro (69% of control, p<0.001, n=2 experiments). Preliminary data suggest that granulosa cells from small follicles (1-3mm) produce greater amounts of GnSIF than those obtained from larger follicles (>6mm).
Conclusions: GnSIF activity is produced by porcine granulosa cells in vitro. Granulosa cell production of GnSIF, along with other gonadal proteins such as inhibin, follistatin, and activin may be an. important component of the ovarian control of pituitary gonadotropin secretion.
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³¼Ò °ú¸³¸·¼¼Æ÷;GnSIF;inhibin;Gonadotropin surge inhibiting factor (GnSIF);Granulosa cell
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