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SCK ¼±¾Ï ¼¼Æ÷ÁÖ¿¡¼­ ¹æ»ç¼±¿¡ ÀÇÇÑ apoptosis¿Í ¼¼Æ÷ ÁÖ±â The Cell Cycle Dependence and Radiation-induced Apoptosis in SCK Mammary Adenocarcinoma Cell Line

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Abstract

¸ñ Àû : SCK ¼±¾Ï ¼¼Æ÷ÁÖ¿¡¼­ ¹æ»ç¼± Á¶»ç¿¡ ÀÇÇØ ÀϾ´Â apoptosis¿Í ¼¼Æ÷ ÁÖ±â¿ÍÀÇ ¿¬°ü¼ºÀ» ±Ô¸íÇÏ°íÀÚÇÏ¿´´Ù.

´ë»ó ¹× ¹æ¹ý : SCK ¼±¾Ï ¼¼Æ÷ÁÖ¸¦ apoptosisÀÇ Åë»óÀûÀÎ Á¤¼º ºÐ¼® ¹æ¹ýÀÎ agarose gel electrophoresis ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© ¹æ»ç¼± Á¶»ç·®°ú ¹èÁö pH ȯ°æ°úÀÇ ¿¬±¸¿¡¼­ 2-12GyÀÇ ¹æ»ç¼± Á¶»ç·®°ú pH 7.5 ¹× 6.6ÀÇ ¹è¾ç ¹èÁö Á¶°ÇÇÏ¿¡¼­ ´Ù¾çÇÑ ¹è¾ç ½Ã°£ÀÇ °æ°ú¿¡ µû¸¥ DNA
fragmentationÀÇ ÁöÇ¥ÀÎ ladderingÀ» °üÂûÇÏ¿´´Ù. ½ÇÇè Á¶ÀÛÀ¸·Î apoptosis°¡ À¯¹ßµÈ ¼¼Æ÷±ºÀ» Á¤·®ÀûÀ¸·Î ºÐ¼®ÇÏ°í ¼¼Æ÷ Áֱ⠺м®À» À§ÇØ FACScanÀ» ÀÌ¿ëÇÏ¿´´Ù.

°á °ú : apoptosis°¡ ¿Õ¼ºÈ÷ ¹ßÇöµÇ¾ú´ø pH 7.5 ¹èÁö¿¡¼­ ¹è¾çÇÏ¿´´ø ¼¼Æ÷¿¡¼­´Â ¹æ»ç¼± Á¶»çÁ÷ÈĺÎÅÍ G2/M phaseÀÇ ¼¼Æ÷µéÀÇ ºÐȹÀÌ Áõ°¡Çϱ⠽ÃÀÛÇÏ¿© 12½Ã°£Â° ¾à 70%±îÁöÀÇ ÃÖ°íÄ¡¸¦ º¸ÀÎ ÈÄ 36½Ã°£Â°¿¡ ¹æ»ç¼±À» Á¶»çÇÏÁö ¾Ê¾Ò´ø »óÅÂÀÇ ºÐȹÀ¸·Î
Á¤»óÈ­µÇ¾ú´Ù. ÇÏÁö¸¸ pH 6.6 ¹èÁö¿¡¼­ ¹è¾çÇÏ¿´´ø ¼¼Æ÷¿¡¼­ÀÇ G2/M phaseÀÇ ¼¼Æ÷µéÀÇ ºÐȹÀÇ Áõ°¡´Â pH 7.5 ¹èÁö¿¡¼­ ¹è¾çÇÏ¿´´ø ¼¼Æ÷µé¿¡ ºñÇØ ºñ±³Àû õõÈ÷ ÀϾ°í ±× ÃÖ°íÄ¡µµ 24½Ã°£Â°¿¡ ¾à 45%·Î °üÂûµÇ¾ú´Ù. ƯÀÌÇÑ °ÍÀº G2/M phaseÀÇ
¼¼Æ÷µéÀÇ ºÐȹÀÌ ±× ÀÌÈÄ °¨¼ÒµÇ´Â Á¤µµ°¡ pH 7.5 ¹èÁö¿¡¼­ ¹è¾çÇÏ¿´´ø ¼¼Æ÷µé¿¡ ºñÇØ ¹Ì¾àÇÏ¿© 48½Ã°£ ¹è¾ç ÀÌÈÄ¿¡µµ ¾à 30-35%ÀÇ ¼¼Æ÷´Â G2/M phaseÀÇ ¼¼Æ÷µéÀÇ ºÐȹÀ¸·Î °üÂûµÇ¾ú´Ù.

°á ·Ð : ¿¬±¸ÀÚµéÀº ÀÌ·¯ÇÑ Çö»óÀÌ ¼¼Æ÷µéÀÌ G2/M phase¿¡¼­ ¸¹Àº ¾çÀÇ ¼¼Æ÷µéÀÌ ÁýÀûµÇ¾î ¼¼Æ÷ Áֱ⸦ ¼øȯÇÏÁö ¸øÇÏ´Â G2/M arrest Çö»óÀ¸·Î ÀÌÇØÇÏ¿´´Ù. ¼¼Æ÷ ³»¿ÜÀÇ »ê¼ºÈ¯°æ »óÅ¿¡¼­ ¹æ»ç¼±À» Á¶»ç ¹ÞÀº SCK Á¾¾ç¼¼Æ÷´Â G2/M arrest »óÅ°¡ Áö¼ÓµÇ¸ç ÀÌ´Â post-mitotic apoptosis¸¦ ¾ïÁ¦ÇÑ´Ù°í Ãß·ÐÇÏ¿´´Ù.

Purpose : The relationship between environmental pH on the radiation induced-apoptosis in SCK mammary adenocarcinoma cells and cell cycle dependence was investigated.

Material and Methods : Mammary adenocarcinoma cells of A/J mice(SCK cells) in exponential growth phase were irradiated with a 137Cs irradiator at room
temperature. The cells were irradiated 1 hour after the media was replaced with fresh
media at a different pHs. After incubation at 37¡É for 0-48 h, the extent of apoptosis
was determined using agarose gel electrophoresis and flow cytometry. The progression
of cells through the cell cycle after irradiation in different pHs was also determined with
flow cytometry.

Results : The induction of apoptosis by irradiation in pH 6.6 medium was markedly less than that in pH 7.5 medium. When the cells were irradiated and maintained in pH 7.5 medium, the percentage of cells in G2/M phase rapidly increased to about 70% at 12 h after an exposure to 12Gy and returned to control level by 36 h. The
percentage of cells in G1 phase decreased as the percentage of cells in
G2/M increased. On the other hand, in pH 6.6 medium the percentage of
cells in G2/M phases gradually increased to about 45% at 24 h after 12Gy
irradiation and then slowly recessed and consequently, as much as 30-35% of the cells
were still in the G2/M phase 48 h after irradiation. The percentage of cells
in G1 phase then increased as the G2/M arrest began to recede. The
radiation-induced G2/M arrest in pH 6.6 medium lasted markedly longer
than that in pH 7.5 medium.

Conclusion : Radiation-induced apoptosis in SCK tumor cells are reversely suppressed in an acidic environment. Radiation-induced G2/M arrest is prolonged in an acidic environment indicating that the suppression of radiation- induced apoptosis and prolongation of radiation-induced G2/M arrest in an acidic environment are related.

Å°¿öµå

Radiation-induced apoptosis; Environmental pH; Cell cycle

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