Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Comparative Expression of the Aedes aegypti 5-Hydroxytryptamine7 Receptor in Drosophila Schneider2 and Chinese Hamster Ovary-K1 Cells

초파리 Schneider2 세포와 Chinese hamster ovary-K1 세포에서 Aedes aegypti 5-Hydroxytryptamine7 수용체의 발현비교

  • 이대원 (서울대학교 농업생명과학대학 농생명공학부)
  • Published : 2004.06.01
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Abstract

Serotonin receptor binds to serotonin (5-HT) and activates effector proteins such as adenylyl cyclase, phospholipase C, cyclic GMP phosphodiesterase or ion channel through G protein on the cell membrane, resulting in various physiological responses like diuresis, memory and development. To examine the comparative expression of the 5-HT$\_$7/ receptor of Aedes aegypti, the Aedes 5-HT$\_$7/ receptor gene was transfected into Drosophila Schneider2 (S2) cells and mammalian Chinese hamster ovary (CHO)-Kl cells. The expression of the Aedes 5-HT$\_$7/ receptor gene in selected cell lines, Tr-CHO and Tr-S2, was confirmed with reverse transcription-PCR, Western blot and immunocytochemistry. Compared with the induced intracellular cAMP level of Tr-S2 cell line to 5-HT, the induced cAMP in the Tr-CHO cell line was over 9 times higher and was dose-dependent. These results suggest that the functionality of Aedes 5-HT$\_$7/ receptor is much more effective in mammalian CHO-K 1 cells and that the Tr-CHO cell line expressing Aedes 5-HT$\_$7/ receptor can be used for synthetic agonist or antagonist candidate screening.

세로토닌 수용체는 세로토닌과 반응하여 세포막의 G단백질을 통해 중개단백질 (adenylyl cyclase, phospholipase C, cGMP phosphodiesterase, ion channel)을 활성화시켜, 이뇨, 기억, 발생 등의 다양한 생리적 반응에 관여한다. 곤충세포인 Schneider2 (S2)와 척추동물 세포인 Chinese hamster ovary (CHO)-Kl에서 Aedes 5-HT$_{7}$ 수용체 유전자 발현을 비교하기 위해, Aedes 5-HT$_{7}$ 수용체 유전자를 형질이입시켰다. 선발된 세포주들(Tr-S2, Tr-CHO)에서 세로토닌 수용체 유전자의 발현은 reverse transcription-PCR, Western blot, immunocytochemistry를 이용하여 확인하였다. 세로토닌 농도증가에 대한 Aedes 5-HT$_{7}$수용체의 기능을 세포 내 cAMP수준을 통해 조사한 결과,Tr-CHO 세포주는 Tr-S2 세포주보다 9배 이상 cAMP수준이 높게 나타났으며, 농도에 의존적이었다. 이 결과는 수용체 유전자가 세포에서 발현되었으나, 세포의 종류와 세포막에 존재하는 G단백질 차이에 따라 중개단백질 활성 차이가 있다는 것을 보여주었다. CHO-Kl 세포에서 Aedes 5-HT$_{7}$ 수용체의 기능이 S2 세포보다 더 효율적이며, Aedes 5-HT$_{7}$ 수용체를 발현하는 Tr-CHO 세포주는 동력제 또는 대립제 검정에 활용될 수 있을 것으로 기대된다. 것으로 기대된다.

Keywords

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