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´ëÀå¾Ï ȯÀÚ Ç÷ûÀ» ÀÌ¿ëÇÑ Ç¥ÇÇ ¼ºÀå ÀÎÀÚ ¼ö¿ëü(EGFr) ¹× º¯Çë ¼ºÀå ÀÎÀÚ ¾ËÆÄ(TGF-¥á)ÀÇ µ¿½Ã ÃøÁ¤ Simultaneous Elevation of Epidermal Growth Factor Receptor and Transforming Growth Factor-¥á in the Serum of Colorectal Cancer Patients

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Abstract

¿¬±¸ ¸ñÀû : EGFr¹× TGF-¥á´Â ´ëÀå Á¡¸·ÀÇ Á¤»ó »óÇÇ ¼¼Æ÷¿¡¼­ Ç¥ÇöµÉ »Ó¸¸ ¾Æ´Ï¶ó ´ë
Àå¾Ï ȯÀÚ¿¡¼­µµ ¸Å¿ì ´Ù¾çÇÏ°Ô °úÇ¥ÇöµÇ´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖ´Ù. º» ¿¬±¸´Â ´ëÀå¾Ï ȯÀÚÀÇ
Ç÷ûÀ» ÀÌ¿ëÇÑ EGFr ¹× TCF-¥áÀÇ µ¿½Ã ÃøÁ¤°ú Á¤»ó ´ëÁ¶±º¿¡¼­ÀÇ EGFr ¹× TGF-¥á ÃøÁ¤
°ú ºñ±³ ºÐ¼®ÇÏ¿© ÀÓ»óÀû À¯¿ë¼ºÀ» ¹àÈ÷°íÀÚ ÇÏ¿´´Ù.
´ë»ó ¹× ¹æ¹ý : ¸ðµÎ 42¿¹ÀÇ ´ëÀå¾Ï ȯÀÚ¿Í °Ç°­ÇÑ Á¤»ó ¼ºÀÎ 20¿¹°¡ ´ëÁ¶±ºÀ¸·Î »ç¿ëµÇ
¾ú´Ù. µÎ ±º°£¿¡ ¼ºº°°ú ¿¬·ÉÀº À¯»çÇÏ¿´´Ù. EGFr¹× TGF-¥á ÃøÁ¤Àº EGFr
AssayTM system ¹× TGF-¥á AssayTM systemÀ» »ç¿ëÇÏ¿©
ELISA¹æ¹ýÀ¸·Î ÃøÁ¤ÇÏ¿´´Ù.
°á °ú : ´ëÀå¾Ï ȯÀÚÀÇ Ç÷û EGFrÀº 413.8¡¾91.4 fm/ml(mean¡¾SD; range, 252 to 641
fm/ml)·Î ´ëÁ¶±ºÀÇ 296.0¡¾53.5 fm/mlº¸´Ù À¯ÀÇÇÏ°Ô ³ô¾Ò´Ù(p=0.0001). ´ëÁ¶±ºÀÇ Æò±Õ+2SD
¸¦ »óÇѼ±À¸·Î ÇÏ¿´À» ¶§ÀÇ EGFr Àüü ¾ç¼º·üÀº 52%(22/42)¿´´Ù. º´±âº° EGFr³óµµ´Â º´±â
A 447.0 fm/ml (n=1), º´±âB 428.7¡¾89.2 fm/ml (n=11), º´±âC 413.9¡¾112.3 fm/ml (n=19),
º´±âD 395.6¡¾53.6 fm/ml (n=11)·Î º´±âº° À¯ÀǼºÀº ¾ø¾ú´Ù. ´ëÀå¾Ï ȯÀÚÀÇ Ç÷û TGF-¥á´Â
92.6¡¾43.9 pg/ml(mean¡¾SD; range, 36 to 231 pg/ml)·Î ´ëÁ¶±ºÀÇ 56.2¡¾ 12.0 pg/mlº¸´Ù À¯
ÀÇÇÏ°Ô ³ô¾Ò´Ù(p=0.001). ´ëÁ¶±ºÀÇ Æò±Õ+ESD¸¦ »óÇѼ±À¸·Î ÇÏ¿´À» ¶§ÀÇ TGF-¥á Àüü ¾ç¼º
·üÀº 50%(21/42)¿´´Ù. º´±âº° TGF-¥á ³óµµ´Â º´±âA 84.1 pg/ml (n=1), º´±âB 112.8¡¾60.2
pg/ml (n=11), º´±âC 84.7¡¾34.8 pg/ml (n=19), º´±âD 78.3 ¡¾ 33.1 (n=11)·Î º´±â º° À¯ÀǼº
Àº ¾ø¾ú´Ù. ´ëÀå¾Ï ȯÀÚ¿¡¼­ Ç÷û EGFr Áõ°¡ÇÔ¿¡ µû¶ó µ¿½Ã¿¡ TGF-¥áµµ Áõ°¡ÇÏ¿© µÎ ÀÎÀÚ
»çÀÌ¿¡´Â À¯ÀÇÇÑ »ó°ü °ü°è°¡ ÀÖ¾ú´Ù(r2=0.23, p<0.05). Ç÷û CEA¾ç¼º·üÀº
47%(20/42)·Î EGFr°ú TGF-¥áÀÇ ¾ç¼ºÀ²°ú À¯»çÇÏ¿´À¸³ª À̸¦ µ¿½Ã ÃøÁ¤ÇÏ¿´À» ¶§ ¾ç¼º·ü
ÀÇ »ó½ÂÀ» º¸¿´´Ù.
°á ·Ð : º» ¿¬±¸´Â EGFr¹× TGF-¥áÀÇ ÀÚ°¡ºÐºñ °í¸®(autocrine loop)¸¦ ´ëÀå¾Ï ȯÀÚ Ç÷û
À» ÀÌ¿ëÇÑ ½ÇÇèÀ¸·Î È®ÀÎÇÏ¿´´Ù. ¶ÇÇÑ, ºñ·Ï º´±âº° À¯ÀǼºÀº ¾ø¾úÀ¸³ª ´ëÀå¾Ï ȯÀÚ Ç÷û³»
EGFr ¹× TGF-¥á´Â ´ëÁ¶±º¿¡ ºñÇØ ÇöÀúÈ÷ ³ôÀº °ÍÀ¸·Î ³ªÅ¸³ª ÇâÈÄ ´õ ¸¹Àº ȯÀÚ¸¦ ´ë»ó
À¸·Î ÀÓ»óÀû À¯¿ë¼º¿¡ ´ëÇÑ ¿¬±¸°¡ ÇÊ¿äÇÒ °ÍÀ¸·Î º»´Ù.

INTRODUCTION
Epidermal growth factor receptor (EGFr) is a membrane bound glycoprotein expressed
on the surface of epithelial cells. EGFr is activated when its ligand binds to the
extracellular domain resulting in phosphorylation of the receptor's intracellular domain by
a family of growth factors. For mammalian cells, in addition to epidermal growth factor
(EGF), these include transforming growth factor-¥á (TGF-¥á), amphiregulin, and
heparin-binding EGF.
EGFrs are expressed at varying levels on normal bowel epithelium and malignant
colon epithelium. Collectively, 25¡­77% of tumors express detectable levels of EGFr by
Western blotting with anti EGFr-antibodies or by immunohistochemistry. Approximately
50¡­90% of colon tumors express TGF-¥á and a subpopulation of tumors contains
higher levels of TGF-¥á protein than that of matched normal colonic mucosa. TGF-¥á
is structurally and functionally related to EGF and acts exculsively through EGFr. Also,
increased EGFr expression is often associated with increased production of TGF-¥á by
the same tumor cells in a subset of colon tumor. These results for coexpression suggest
that a potential autocrine loop involving TGF-¥á may be operative in vivo for some of
these tumors.
The present study investigated the serum EGFr levels, serum TGF-¥á levels, and the
well known biomarker carcinoembryonic antigen (CEA) in patients with colorectal cancer
and control group. We evaluated the clinical significance of the results in association
with tumor stage, histology, and other parameters. Finally, we investigated the
relationship between serum EGFr levels and serum TGF-¥á levels. We used the enzyme
linked immunosorbent assay (ELISA) system to quantitate EGFr and TGF-¥á in the
sera of colorectal cancer patients. Serum EGFr extracellular domain (EGFr ECD) levels
were measured for the detection of EGFr.

Å°¿öµå

´ëÀå¾Ï; EGFr; TGF-¥á; ELISA; Ç÷û;

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