肥胖儿童食欲素、瘦素和神经肽Y水平及其相互关系

目的分析肥胖儿童血中食欲素(O rex ins)、瘦素(L eptin、LEP)和神经肽Y(neuropeptide Y,NPY)水平及其相互关系,探讨O rex ins,LEP和NPY在儿童肥胖发生中的作用及三者存在的相互作用关系。方法以放射免疫法测定98名肥胖〔BM I男(29.24±1.87)kg/m2,女(28.12±2.30)kg/m2〕和104名正常对照〔BM I男(20.49±1.95)kg/m2,女(19.59±1.51)kg/m2〕儿童血中的LEP、O rex ins和NPY浓度。结果肥胖儿童血中LEP浓度〔男(26.00±14.66)ng/mL;女(33.59±14.63)ng/mL〕高于对照组儿童〔男(6.65±4.49)ng/mL;女(10.48±5.52)ng/mL,P<0.01〕;肥胖儿童血中O rex inA浓度〔男(3.23±1.86)pg/mL;女(3.38±1.80)pg/mL〕低于对照组〔男(4.52±1.52)pg/mL;女(4.71±1.53)pg/mL,P<0.05〕;两组间LEP与NPY皆呈负相关关系(对照组r=-0.310;肥胖组r=-0.302,P均<0.01),但斜率不同(对照组-2.969;肥胖组-0.809);NPY与O rex inA为正相关关系r=0.207 P<0.05,肥胖组儿童相对于对照组O rex inA的波动范围明显变小。结论肥胖儿童与对照组相比血中LEP与O rex inA浓度水平相反,儿童肥胖的发生与LEP、O rex inA、NPY和它们之间的相互作用有关。

Blood Leptin, Orexins and NPY Levels and Their Relations in Obese Children

OBJECTIVE: To investigate the concentration levels of leptin, orexins and neuropeptide Y (NPY) in the blood of obese children, and to analysed the relationship between these substances. METHODS: RIA methods were used to measure the concentrations of leptin, orexinA, orexinB, and NPY in the blood of 98 obese children BMI: male (29.24 +/- 1.87) kg/mZ, female (28.12 +/- 2.30) kg/m2] and in 104 normal children BMI: male (20.49 +/- 1.95) kg/m2, female (19.59 +/- 1.51) kg/m2] as the control group. RESULTS: The leptin concentrations in obese children male (26.00 +/- 14.66) ng/mL; female (33.59 +/- 14.63) ng/mL] were higher than those in the control group male (6.65 +/- 44.49) ng/mL; female 10.48 +/- 5.52) ng/mL P < 0.013]. The concentrations of plasma orexinA in obes children male (3.23 +/- 1.86) pg/mL; female (3.38 +/- 1.80) pg/mL] were lower than those in the control group male (4.52 +/- 1.52) pg/mL; female (4.71 +/- 1.53) pg/mL P < 0.05]; Negative correlations between leptin and NPY were noted in the obesity group (r = -0.302) and the control group (r = -0.310, P < 0.01), while the slopes in the two groups were different (control group -2.969; obese group -0.809). A positive correlation between NPY and orexinA was noted (r = 0.207, P < 0.05). The fluctuation range of orexinA in obese children was markedly narrowed when compared with that in the control group. CONCLUSION: The concentration level of peripheral orexinA and leptin in the obese and non-obese children change inversely. The obesity in children correlates with the concentrations of orexinA, leptin, NPY as well as with their interactions.