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Orotic Acid¿¡ ÀÇÇÑ Áö¹æ°£ Çü¼º°úÁ¤ÀÇ ÃʹÌÇüÅ ÇÐÀû ¿¬±¸ An Ultrastructural Cytochemical Study on the Mechanism in the Development of Fatty Liver Induced by the Orotie Acid

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Abstract

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ÀúÀÚµéÀº orotic acid¿¡ ÀÇÇÑ Áö¹æ°£ »ý¼ºÀÇ º´¸®±âÀüÀ» ±Ô¸íÇϱâ À§ÇÏ¿© Sprague¡¤
Dawley°è ¼öÄÆ ÈòÁã¿¡ 1% orotic acid°¡ ÷°¡µÈ ±ÔÁ¤½ÄÀ» ÀÏÁÖÀÏ°£ ¸ÔÀÎµÚ °£À» äÃëÇÏ¿©
ÇüÅÂÇÐÀû º¯È­¸¦ °üÂûÇÏ¿´´Ù. ½ÇÇ豺Àº orotic acidÇÔÀ¯ ±ÔÁ¤½ÄÀ» ¸ÔÀÎ 1,3,5,7ÀÏ ÈÄ¿¡ °¢°¢
µµ»ìÇÑ °Í°ú orotic acid¸¦ 1ÁÖÀÏ°£ ¸ÔÀÎ µÚ ´Ù½Ã ÀϹݽÄÀÌ·Î ÀüȯÇÑ ±ºÀ¸·Î ³ª´©¾úÀ¸¸ç ´ë
Á¶±ºÀº orotic acid¸¦ ³ÖÁö ¾Ê´Â ±ÔÁ¤½Ä°ú ÀϹݽÄÀÏ ¸ÔÀÎ °ÍÀ» »ç¿ëÇÏ¿´´Ù. °£Á¶Á÷Àº ±¤ÇÐÇö
¹Ì°æ ¹× ÀüÀÚÇö¹Ì°æÀûÀ¸·Î °üÂûÇÏ¿´À¸¸ç ´õÇÏ¿© G-6-Pase¿Í TPPaseÀÇ ÀüÀÚÇö¹Ì°æÀû ¼¼Æ÷
È­ÇÐÀû °Ë»ç¸¦ ½ÃµµÇÏ¿´´Ù. °á°ú¸¦ ¿ä¾àÇÏ¸é ±¤ÇÐÇö¹Ì°æÀûÀ¸·Î orotic acidÅõ¿© 3ÀÏ ÈĺÎÅÍ
Áö¹æÀûÀÌ º¸¿´À¸¸ç 7ÀÏ ÈÄ¿¡´Â Àüü °£¼¼Æ÷¿¡¼­ °üÂûµÇ¾ú´Ù. ÀüÀÚÇö¹Ì°æÀûÀ¸·Î orotic acid
Åõ¿© 3ÀÏ ÈÄ ERÀÌ ¼öÆ÷»óÀ¸·Î ºÐÀýµÇ¾úÀ¸¸ç Golgiü ÁÖº¯¿¡ VLDLÀÔÀÚ¸¦ °¡Áø ¼öÆ÷°¡ ºÐ
Æ÷ÇÏ¿´´Ù. 5ÀÏ ÈÄ¿¡´Â »ó±â ÇÑ VLDLÀÔÀÚ¸¦ °¡Áø ¼öÆ÷°¡ ¹è¿­ÇÏ¿© Golgi stackÀ» Çü¼ºÇÏ¿´
´Ù. 7ÀÏ ÈÄ ¿¡´Â GolgiüÀÇ ¼ö°¡ Áõ°¡ÇÏ¿´´Ù. Orotic acidÅõ¿© 3ÀÏ ÈĺÎÅÍ Áö¹æÀûÀÇ ¼ö°¡ Áõ
°¡ÇÏ¿´À¸¸ç 7ÀÏ ÈÄ¿¡´Â ¼¼Æ÷ÁúÀÇ »ó´çºÎºÐÀÌ Áö¹æÀû¿¡ ¹Ð·È´Ù. ¼¼Æ÷È­ÇÐÀû °Ë»ç¿¡¼­ Áö¹æÀû
À» ½Î´Â ¸·Àº TPPase¾ç¼º ¹ÝÀÀÀ» º¸¿© RER¿¡¼­ À¯·¡ÇÑ °ÍÀ¸·Î »ý°¢µÇ¾ú´Ù. Golgiü´Â
erotic acidÅõ¿© 1ÀÏ ÈĺÎÅÍ TPPaseÈ°¼ºÀÌ °¨¼ÒÇÏ¿´À¸¸ç ±× ÈÄ¿¡´Â ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù.
ÀÌ»óÀÇ ¼ºÀûÀ¸·Î º¸¾Æ orotic acid´Â Golgi stackÀÇ trans¸éÀÇ ±â´É°ú VLDLÀÇ ¼º¼÷À» Àå
¾ÖÇÏ¿© VLDLÀÇ ºÐºñ¸¦ ¾ïÁ¦ÇÏ°í °á°úÀûÀ¸·Î VLDLÀÇ ÃàÀûÀ» À¯¹ßÇÑ´Ù. Golgi stackÀÇ cia
¸é°ú RER¿¡´Â VLDL ÀÔÀÚ°¡ ÃàÀûµÇ°í °á°úÀûÀ¸·Î VLDLÀÔÀÚ¸¦ °¡Áø ¼öÆ÷°¡ ÇÕÃÄÁ®¼­ Áö
¹æÀûÀ» ¸¸µç´Ù. ÀÌ¿Í °°Àº RER°ú GolgiüÀÇ ¿¬¼ÓÀûÀÎ º¯È­´Â ¸· ±¸Á¶ÀÇ º¯È­¿¡¼­
cytocavitary networkÀÇ °³³äÀ» µÞ¹ÞħÇÑ´Ù°í »ý°¢µÈ´Ù.
#ÃÊ·Ï#
For the elucidation of a possible pathogenetic mechanism of fatty accumulation by the
orotic acid in the liver, male Sprague-Dawley rats were fed on semisynthetic diet
containing 1 per cent orotic acid for a week, and followed by the morphological
examination on the rat livers.
The experimental animals were sacrificed on the 1st, 2nd, 3rd, and the 7th day of
orotic acid feeding and daily sacrifice was performed after conversion to normal diet
feeding during the performed after conversion to normal diet feeding during the period
of successive 7 days. The control group animals were fed on normal regular diet, or
semisynthetic diet without orotic acid. The liver tissues were examined by the light and
electron microscopy, together with electron microscopic cytochemical study for
glucose-6-phosphatase and thiamine pyrophosphatase. On the light microscopy, the lipid
droplets began to appear in the 3rd day of orotic acid feeding and then occupy through
the all hepatic lobules in the 7th day of orotic acid feeding. On the electron microscopy,
in the 3rd day of orotic acid administration, the endoplasmic rdticulum were fragmented
and vesiculated, and vesicles containing VLDL particles were demonstrated closely
around the Golgi complex. In the 5th day, these enriched vesicles were arranged in a
row, and assembled in the form of Golgi stack. In the 7th day, Golgi complex were in-
creased in numbers. The limiting membranes of lipid vacuoles were regarded to
originated from rough-surfaced endoplasmic rdticulum of account of demonstration of
glucose-6-phosphatase in them. In the Golgi complex the activity of thiamine
pyprophosphatase were markedly decreased in the 1st day of orotic acid feeding, and
then the activity of this enzyme is failed to present afterthat.
On the above findings it is assumed that orotic acid depresses the function of trans
aspect of Golgi stack and the VLDL maturation is inhibited, so the excretion process of
VLDL is interrupted and followed by the retrograde accumulation of VLDL. The cis
aspect of Golgi stack and rough-surfaced endoplasmic reticulum were accumulated with
VLDL particles, and eventually coalesced vesicles of VLDL with become lipid vacuole.
The sequential alteration of endoplasmic reticulum and Golgi complex is supporting the
concept of conformational change of membranes in cytocavitary network.

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