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CD45 ¿¢¼Õ 6°á¼Õ ¸¶¿ì½º¿¡¼­ÀÇ ´ë½Ä¼¼Æ÷ ±â´É Macrophage Fuctions in CD45 Exon 6 Deficient Mice

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Abstract

ÃÖ±Ù ¼¼Æ÷ÀÇ ¹ß»ý, ºÐÈ­ ¹× È°¼ºÈ­¿¡ °ü¿©ÇÏ´Â ¿©·¯°¡Áö Ç׿øÀÌ ÀÕ´Þ¾Æ gene targeting µÊ
À¸·Î½á °¢ Ç׿øÀÇ ±â´ÉÀÌ º¸´Ù ¸íÈ®È÷ ÆľÇÇÒ ¼ö ÀÖ°Ô µÇ¾ú´Ù. CD45 ¿¢¼Õ 6 °á¼Õ ¸¶¿ì½º¸¦
ºÐ¼® ÇÔÀ¸·Î CD45°¡ T¼¼Æ÷ÀÇ ¹ß»ý ¹× ºÐÈ­¿¡ ¸Å¿ì Áß¿äÇÑ ¿ªÇÒÀ» Çϸç, ÀÓÆı¸ÀÇ Ç׿ø ¼ö
¿ëü¸¦ ÅëÇÑ ½ÅÈ£ Àü´Þ¿¡ ºÒ°¡°áÇÏ´Ù´Â »ç½ÇµîÀÌ ¹àÇôÁ³°í ±×¹ÛÀÇ »ýü³» ±â´É¿¡ ´ëÇØ ¿¬±¸
°¡ ÁøÇàµÇ°í ÀÖ´Ù. ´ë½Ä¼¼Æ÷¿¡¼­ÀÇ CD45ÀÇ ¿ªÇÒÀ» ¾Ë¾Æº¸±â À§ÇØ CD45 ¿¢¼Õ6 °á¼Õ ¸¶¿ì½º
(C57BL/7 À¯·¡)ÀÇ ´ë½Ä¼¼Æ÷¿¡¼­ ´ÜÀÏÇ×ü¸¦ ÀÌ¿ëÇÑ ¼¼Æ÷Ç¥¸é Ç׿ø ¹ßÇöÀÇ FACSºÐ¼®,
RT-PCR¹ý¿¡ ÀÇÇÑ ¸ð³ëÄ«ÀÎÀÇ »ý»ê, OVA¸é¿ª TÀÓÆı¸¸¦ »ç¿ëÇÑ Ç׿øÁ¦½Ã´É, ¸é¾çÀûÇ÷±¸
¹× Çü±¤Ã¼ ÇǺ¹ latex beads¸¦ ÀÌ¿ëÇÑ Å½½Ä´É°ú p815 mastocytoma ¼¼Æ÷ÁÖ¸¦ ÀÌ¿ëÇÑ Ç×Á¾¾ç
¼¼Æ÷ÀúÁö´ÉÀ» ÃøÁ¤ÈÄ Á¤»ó ¸¶¿ì½º(C57BL/6)ÀÇ ´ë½Ä¼¼Æ÷¿Í ºñ±³ ºÐ¼®ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú
¸¦ ¾ò¾ú´Ù.
1. ´ë½Ä¼¼Æ÷ Ç¥¸é Ç׿ø(F4/80°ú Mac-1)°ú IabÀÇ ¹ßÇö¿¡´Â µÎ±º°£¿¡ Â÷ÀÌ°¡
¾ø¾úÀ¸³ª CD45 ¿¢¼Õ 6 °á¼Õ ¸¶¿ì½º¿¡¼­ CD45ÀÇ ¹ßÇöÀº º¼ ¼ö ¾ø¾ú´Ù.
2. ¸ð³ëÄ«ÀÎ(IL-1¥á, IL-6, TNF-¥á, JE TGF-¥â, Eta-l, IFN-¥á, GM-CSF, M-CSF-lR,
G-CSF-R) ¹× NOSÀÇ ¹ßÇö¿¡¼­´Â µÎ±º°£¿¡ Â÷ÀÌ°¡ ¾ø¾ú´Ù
3. Ç׿øÁ¦½Ã´É¿¡¼­´Â CD45 ¿¢¼Õ 6 °á¼Õ ¸¶¿ì½º¿Í Á¤»ó ¸¶¿ì½º°£ÀÇ À¯ÀÇÇÑ Â÷À̸¦ º¼ ¼ö
¾ø¾ú´Ù
4. Ž½Ä´É¿¡¼­µµ µÎ ±º°£ÀÇ À¯ÀÇÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù.
5. ´ë½Ä¼¼Æ÷¸¦ IFW-¥ã·Î È°¼ºÈ­ÇÑ ½ÇÇè¿¡¼­´Â CD45¿¢¼Õ 6°á¼Õ ¸¶¿ì½º À¯·¡ ´ë½Ä¼¼Æ÷¿¡
¼­ Ç×Á¾¾ç Á¦Áö´ÉÀÌ Á¤»ó ¸¶¿ì½º ´ë½Ä¼¼Æ÷¿¡ ºñÇØ À¯ÀÇÇÏ°Ô ³·¾ÒÀ¸³ª, LPS·Î È°¼ºÈ­ÇÑ ½Ç
Çè¿¡¼­´Â ¹Ý´ë·Î À¯ÀÇÇÏ°Ô ³ô¾Ò´Ù.
ÀÌ»óÀÇ °á°ú·Îº¸¾Æ CD45°¡ ´ë½Ä¼¼Æ÷ÀÇ È°¼º°ú ±â´É¿¡ °áÁ¤ÀûÀÎ ¿ªÈ°Àº ÇÏÁö¾Ê¾ÒÀ¸³ª È°
¼ºÈ­µÈ ´ë½Ä¼¼Æ÷ÀÇ Ç×Á¾¾ç ±âÀü¿¡ °ü¿©Çϸç, ´ë½Ä¼¼Æ÷ÀÇ IFN-¥ã¿Í LPS¿¡ ÀÇÇÑ È°¼ºÈ­ ±âÀü
¿¡¼­ ¼­·Î ¹Ý´ë·Î ÀÛ¿ëÇÒ ¼ö ÀÖ´Ù´Â °ÍÀ» ½Ã»çÇÑ´Ù.
#ÃÊ·Ï#
CD45, a membrane protein tyrosine phosphatase(PTP), is expressed in multiple
isoforms on all nucleated hematopoietic cells. The diversity of CD45 isoforms is
generated by alterative splicing of variable exons(mainly econ 4¡­6). It is suggested that
CD45 is one of the most important molecules for signal transduction of hematopoietic
cells. Thus, it is supposed that CD45 dephosphorylates a phosphotyrosyl residue of a
negative regulation site located commonly in C-terminal portions of torc family protein
tyrosine kinases followed by the activation of the kineses. Previously, critical roles of
CD45 in a signaling pathway mediated by antigen receptors expressed on lymphocytes
have been demonstrated in CD45 axon 6-deficient mice(CD45-/-mice)
generated by gene targeting technology. However, the significance of CD45 in
macrophage differentiation and functions is still unknown. In this study, we approached
these problems by analyzing macrophage activation and functions in CD45 exon
6-deficient mice. The results were described as follows:
1. The expression levels of the lineage-specific surface antigens (F4/80 and Macl-¥á)
and MHC class II (lab) molecule on proteose peptone-induced macrophages
from peritoneal cavities of CD45-/-mice were not significantly different
from those from normal mice except the CD45 surface expression was undetectable in
CD45-/-mice.
2. As the results of quantitative RT-PCR analysis, the gene expression of
monokines(IL-1¥á, IL¡­6, TNF-¥á, Eta-1, JE, IFN-¥á, GM-CSF, CSF-R and G-CSF-R)
and inducible nitric oxide synthase (iNOS) in unstimulated and LPS-or IFN-¥ã
-stimulated macrophages from peritoneal exudate cells of CD45-/- mice
showed no significant difference that from normal mice.
3. The antigen presentation ability of macrophages from CD45-/-mice
was comparable to that from normal mice.
4. No significant difference of phagocytic activities was observed in macrophages from
CD45-/- and normal mice using latex particles.
5. In the cytostasis assay using P8l5 mastcytoma cell line as target cells, IFN-¥ã
-stimulated macrophages except CD45 expression showed a significant decrease of
cytostatic activity, while LPS-stimulated macrophages except CD45 had an more
enhanced cytostatic activity than the, normal control.
6. No difference in nitric oxide production and was observed in LPS-or IFN-¥ã
-stimulated macrophages despite CD45 expression.
These results suggest that CD45 in not crucial for macrophage activation and
functions. However, differential influence of CD45 defect was observed in cytostatic
activity in LPS-or IFN-¥ã-stimulated macrophages implying CD45 may be involved in
the regulation mechanism to induce cytostatic activity in macrophages by LPS or IFN-
¥ã.

CD45; Protein tyrosine phosphotase; Gene tasseling; Macrophage; Monokine; Antigen presentation; Phagocytosis; Cytostasis; No.;

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