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»ý¹°ÇÐÀû Ä¡·á ¸ñÇ¥·Î¼­ À§¾Ï¿¡¼­ Midkine ¹ßÇöÀÇ Å½»ö Evaluation of Biologic phenotype by Midkine Gene Expression in Gastric Cancer as a Target for Biotherapy

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Abstract

°á·Ð
À§¾Ï ¼¼Æ÷ÁÖ¸¦ ÀÌ¿ëÇÏ¿© MK À¯ÀüÀÚ ¹ßÇö¿¡ µû¸¥ »ý¹°ÇÐÀû È°¼ºÀÇ Â÷À̸¦ Á¶»çÇÏ¿© ´ÙÀ½
°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1) À§¾Ï ¼¼Æ÷ÁÖ¿¡¼­´Â 66.7%(6/9), À§¾ÏÁ¶Á÷¿¡¼­´Â 56.0%(14/25)ÀÇ ºóµµ·Î MK À¯ÀüÀÚÀÇ
mRNA ¹ßÇöÀÌ °üÂûµÇ¾ú´Ù.
2) MK ¹ßÇöÇÏ´Â À§¾Ï ¼¼Æ÷ÁÖ¿¡¼­ Áý¶ôÇü¼º´ÉÀÌ Áõ°¡ÇÏ¿´´Ù.
3) MK ¹ßÇö°ú uPA¹ßÇö°úÀÇ »ó°ü¼ºÀº ¾ø¾ú´Ù.
4) MK ¹ßÇöÇÏ´Â À§¾Ï¼¼Æ÷ÁÖ¿¡¼­ Áõ°¡µÈ ³»ÇÇ ¼¼Æ÷ Áõ½Ä À¯µµ´ÉÀÌ °üÂûµÇ¾ú´Ù.
5) MK ´Ü¹éÀ» ¹ßÇöÇÏ´Â À§¾Ï¼¼Æ÷ÁÖÀÇ autocrine ¼¼Æ÷Áõ½Ä Åë·Î´Â heparine binding
analogueÀÎ pentosan polysulfate¿¡ ÀÇÇØ ¾ïÁ¦µÇ¾ú´Ù.
6) À§¾ÏÁ¶Á÷¿¡¼­ MK À¯ÀüÀÚ ¹ßÇöºóµµ´Â Á¾¾çÀÇ Å©±â°¡ Ŭ¼ö·Ï Áõ°¡ÇÏ¿´´Ù.
ÀÌ»óÀÇ °á°ú·Î MK À¯ÀüÀÚ´Â À§¾Ï¿¡¼­ autocrine pathway¿Í paracrine pathway¿¡ ÀÇÇØ
Áõ½ÄÀ» À¯µµÇϸç, ÀÌ autocrine pathway´Â »ý¹°ÇÐÀû ¾ïÁ¦Á¦¸¦ »ç¿ëÇÏ¿© º¯È¯ÀÌ °¡´ÉÇÏ¿´´Ù.
µû¶ó¼­ À§¾Ï¿¡¼­ ƯÀÌÀû Ä¡·á¸ñÇ¥¸¦ Á¶ÀýÇÏ´Â »ý¹°ÇÐÀû Ä¡·áÀÇ °¡´É¼ºÀ» Á¦½ÃÇÒ ¼ö ÀÖ¾ú´Ù.
#ÃÊ·Ï#
Purpose : We studied biological phenotypes of gastric cancer cell lines based on a
novel heparin-binding growth/differentiation factor, midkine (MK) expression.
Materials and Methods : Nine gastric cancer cell lines and 25 gastric cancer tissues
were tested for MK expression by Northern blot . analysis. Soft agar assay for in vitro
tumorigenesis, cross- feeding assay for paracrine angiogenic activity, ELISA for uPA
and PAI-1 measurement were performed.
Results : MK expression was found in 67% (6/9) of the gastric cancer cell lines, and
56%(14/25) of the primary gastric cancer tissues. Gastric cancer cell lines with MK
expression were more tumorigenic in soft agar assay and endothelial cell growth
stimulatory in cross-feeding assay than cells which did not express MK. However,
urokinase-type plasminogen activator (uPA) expression did not correlate with MK
expression. Growth of MK expressing cells was inhibited by a heparin-binding blocking
agent, pentosan polysulfate (PPS). In cancer tissues, MK expression correlated with
tumor size, suggesting in vivo autocrine and paracrine activity.
Conclusion : Gastric cancer cells with increased MK gene expression showed
increased tumorigenic and angiogenic activity. Therefore, this proliferation promoting
activity of MK can be targeted by an anti-heparin binding agent as a biotherapy model
in gastric cancer treatment.

Å°¿öµå

Gastric cancer; Midkine; Pentosan polysulfate; Biotherapy;

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