Soppela Päivi, Nieminen Mauri
Arctic Centre, University of Lapland, P.O. Box 122, 96101 Rovaniemi, Finland.
Comp Biochem Physiol A Mol Integr Physiol. 2002 Jun;132(2):403-9. doi: 10.1016/s1095-6433(02)00040-5.
We studied the effect of moderate undernutrition on the fatty acid composition of adipose tissues in reindeer calves (<1 year) between early winter and late spring. Calves studied in early winter (December) had grazed on natural pastures and were in good condition, while the calves in spring (April) had been maintained on a negative energy balance since December, had lost approximately 16% of body weight and were in a moderate undernutritional state. The fatty acid composition of total lipids in adipose tissues (perirenal-abdominal, peristernal, scapular, intralumbar, and caudal locations) had a high proportion of oleic acid (35-47%) in both seasons. The proportion of oleic acid was significantly lower (29%), and that of palmitic acid (31%) was higher in the adipose tissue of cardiac groove as compared to other locations. There were only small differences in the fatty acid composition of adipose tissues between early winter and spring. However, the proportions of the principal C18-polyunsaturated fatty acids (PUFAs), linoleic and alpha-linolenic acid, were significantly lower in all adipose tissues in calves in poor than in good condition. The observations suggest that linoleic and alpha-linolenic acids may be selectively mobilized from adipose tissues of undernourished reindeer during winter.
我们研究了初冬到晚春期间，中度营养不良对驯鹿幼崽（<1岁）脂肪组织脂肪酸组成的影响。在初冬（12月）研究的幼崽以天然牧场为食，身体状况良好，而春季（4月）的幼崽自12月以来一直处于负能量平衡状态，体重减轻了约16%，处于中度营养不良状态。两个季节中，脂肪组织（肾周-腹部、胸骨旁、肩胛、腰椎内和尾部）总脂质的脂肪酸组成中油酸比例都很高（35-47%）。与其他部位相比，心沟脂肪组织中油酸比例显著较低（29%），棕榈酸比例（31%）较高。初冬和春季之间，脂肪组织的脂肪酸组成只有微小差异。然而，状况不佳的幼崽所有脂肪组织中主要的C18多不饱和脂肪酸（PUFA），即亚油酸和α-亚麻酸的比例，明显低于状况良好的幼崽。这些观察结果表明，冬季期间，亚油酸和α-亚麻酸可能会从营养不良的驯鹿脂肪组织中被选择性地动员出来。
