Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effects of Pine Needle Extract Oil on Blood Glucose and Serum Insulin Levels in db/db Mice

2형 당뇨 마우스에서 솔잎 추출용액의 경구투여가 혈당조절에 미치는 영향

  • Published : 2006.03.01
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Abstract

This study was performed to investigate the hypoglycemic effect of pine needle extract oil against type 2 diabetes. Six-week-old male C57BL/Ks(db/db) mice were divided into four groups : negative control, pine needle extract oil low dose, high dose and positive control groups, which fed daily for 6 weeks with corn oil, pine needle extract oil 112.5 mg/kg, 450 mg/kg or metformin (150 mg/kg ), respectively. The oral administration of the pine needle extract oil resulted in the significant and dose-dependent decreases of blood glucose levels in comparison with corn oil treatment. The levels of HbAlc showed a tendency of the decrease by the high dose treatment of the pine needle extract oil and were positively correlated with blood glucose levels (r=0.5046, p=0.0023) . However, the levels of serum insulin and C-peptide were not affected by pine needle extract oil or metformin treatments. The levels of serum leptin, which is related with the insulin sensitivity, showed a tendency of the increases by pine needle extract oil treatment and were negatively correlated to blood glucose levels (r=-0.4754, p=0.0052). In conclusion, these results suggest that the pine needle extract oil have a potential for the oral anti-hyperglycemic agent and the mode of action may be related with the improvement of the insulin sensitivity through blood leptin.

본 연구는 솔잎을 수증기 증류법으로 생산한 솔잎 추출용액을 2형 당뇨 마우스인 db/db mice에게 투여하여 솔잎 추출용액의 혈당강하 효과를 조사하고자 하였다. 이를 위해서 $30{\sim}40g$정도의 6주령 수컷 C57BL/Ksj(BL/Ls) homozygous diabetic(db/db) mice(SPF)를 음성대조군(corn oil), 솔잎 추출용액 저용량군(112.5 mg/kg), 고용량군(450 mg/kg) 및 양성대조군(metformin 150 mg/kg)의 4군으로 나누어 6주간 시험물질을 경구 투여하였다. 6주 사육기간 동안 혈당의 변화를 측정하기 위해 매주 1회씩 6시간 공복 시 미정맥으로부터 혈당을 측정하였으며, 6주 실험종료 후 모든 동물은 희생시킨 후 복대정맥에서 혈액을 채취하여 당화혈색소(HbAlc), 혈청 인슐린, C-peptide 및 leptin 농도 등을 측정하였다. 그 결과 다음과 같은 결론을 얻었다. 식이섭취량은 솔잎 추출용액 투여군에서 감소하는 경향을 보였으며, 양성대조군은 섭취량의 변화가 없었고, 1일 1마리당 평균섭취량은 고용량군이 음성대조군 및 양성대조군에 비하여 유의적으로 낮은 섭취량을 보였다. 체중은 군 간의 차이가 나타나지 않았으며, 간 무게와 상대적 간 무게는 음성대조군에 비하여 솔잎 추출용액 고용량군에서 유의적으로 높게 나타났다. 혈당은 솔잎 추출용액 고용량군에서 실험개시 3주부터 음성대조군에 비하여 유의적으로 감소하였으며, 최종 혈당은 저용량과 고용량군 모두 음성 대조군에 비해 유의적으로 낮아졌고, 용량 의존적인 경향성을 나타내었다. 당화혈색소의 함량 역시 솔잎 추출용액 고용량군에서 음성대조군에 비해 유의적이지는 않지만 낮은 경향을 보였다. 혈청 인슐린과 C-peptide농도는 솔잎 추출용액의 투여에 따른 차이가 나타나지 않아 솔잎 추출용액이 인슐린의 생성에 영향을 미치지는 않는 것으로 사료된다. 혈청 leptin 농도는 유의적이지는 않지만 음성대조군에 비해 솔잎 추출용액 투여군에서 높은 경향을 나타냈으며, 혈당과 음의 상관관계를 나타내고 있어 솔잎 추출용액의 혈당강하 효과의 작용기전으로 leptin과 관련된 인슐린 감수성에 영향을 미첬을 가능성이 있는 것으로 기대된다. 그러므로 본 연구에 사용한 112.5 mg/kg 및 450 mg/kg의 솔잎 추출용액은 6주 경구투여 시 혈당강하 효과를 나타냈으며, 인슐린의 농도에는 영향을 미치지는 않았다. 이러한 결과는 솔잎 추출용액의 혈당강하 효과의 작용기전이 인슐린의 감수성이나 저항성에 영향을 미쳤을 가능성이 있는 것으로 기대되며, 본 연구가 앞으로 솔잎 추출용액에 대한 다양한 연구를 활성화하는데 기여할 것으로 사료된다.

Keywords

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