트레드밀 운동이 당뇨 유발 쥐 심근의 단백질 수송체 및 젖산탈수소 동위효소 발현에 미치는 영향
Effects of treadmill exercise on MCTs and LDH expression of heart tissue in the streptozotocin-induced diabetic rats.
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본 연구의 목적은 저강도 트레드밀 운동이 스트렙토조토신으로 유도된 당뇨 흰쥐의 심장근육 세포의 MCT 1(monocarboxylate transporter1) 발현과 LDH(lactate dehydrogenase) 발현에 미치는 영향을 알아보기 위한 것이다. 본 연구를 수행하기 위하여 생후 7주령 SD 계열의 수컷 흰쥐의 복강에 STZ를 투여하여 당뇨를 유발한 후 통제집단(n=12), 당뇨유발집단(n=12), 당뇨운동집단(n=12)으로 분류하여 4주간 주당 4회, 1회당 20분, 저강도 트레드밀운동을 실시하였다. 본 실험 결과 당뇨 유발 군의 모든 LDH 동위효소는 정상 대조군에 비해 유의하게 감소하는 것으로 나타났으며, 당뇨 유발 후 저강도 운동을 수행한 그룹의 LDH 동위효소는 당뇨 유발 후 운동을 수행하지 않은 그룹에 비해 유의하게 증가하는 것으로 나타났다(p<.05). 또한 MCT 발현량은 대조군에 비해 당뇨군들이 유의하게 감소되는 것으로 나타났으며, 당뇨 유발 후 저강도 운동을 수행한 집단은 당뇨유발 후 운동을 수행하지 않는 그룹에 비해 유의하게 증가하는 경향을 보였다. 본 연구에서는 당뇨쥐 심근조직의 MCT 1의 발현이 운동에 의해 증가되는 결과를 나타냈으나, 본 연구결과를 종합해 볼 때, 비록 운동이 MCTs 단백질의 발현을 조절하는 요소라 하지만 급성 근육 자극이나, 운동량이 MCTs 발현에 어떻게 영향을 주는지에 관하여는 향후 지속적인 연구가 이루어져야 할 것으로 사료된다.
Abstract
We examined the changes in monocarboxylate transporter 1 (MCT1) and lactate dehydrogenase (LDH) isozymes in heart in sedentary control and streptozotocin (STZ)-induced diabetic rats (4 wk) and in trained (4 wk) control and STZ-induced diabetic animals. In nondiabetic animals, training increased MCT1 in the heart muscles (p<.05). LDH B4 was increased in the heart muscles (p<.05). In sedentary diabetic animals, MCT1 was reduced in the heart muscles (p<.05). LDH B4 content was also reduced in sedentary diabetic animals in the heart muscles (p<.05). In contrast, in trained diabetic animals, MCT 1 and LDH B4 in heart muscle were markedly greater than in the sedentary diabetic animals (p<.05). These studies have shown that 1) with STZ-induced diabetes, MCT1 and LDH B4 are reduced in the heart and 2) exercise training alleviated these diabetes induced reductions.
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