铁缺乏儿童血清转铁蛋白受体的变化及对铁干预的反应

目的观察血清转铁蛋白受体(sTfR)在铁状况正常和不同程度缺铁儿童体内的水平和铁干预后的变化,评价sTfR在筛检人群铁缺乏和补铁效果中的价值.方法初筛北京房山区6～14岁儿童1006名,检测其铁生化指标,从中筛选铁正常、贮存铁减少(ID)、红细胞生成缺铁(IDE)和缺铁性贫血(IDA)儿童239名,采用双抗体夹心ELISA法测定sTfR含量,计算sTfR/log血清铁蛋白(SF).对铁缺乏儿童给予口服乙二胺四乙酸钠铁胶囊(60mg元素铁/粒),每次1粒,ID与IDE儿童,每周1次,IDA儿童每周3次,连续9周.补铁后重复测定铁生化指标与sTfR,比较补铁前后sTfR的变化.结果ID、IDE、IDA期儿童sTfR含量分别为(20.03±2.33)nmol/L、(24.52±1.07)nmol/L和(33.28±6.09)nmol/L,sTfR/logSF值分别为18.15±5.31、20.98±8.88和29.08±8.57,均显著高于正常对照组的sTfR(18.74±3.06)nmol/L与sTfR/logSF值9.89±1.74.sTfR与红细胞游离原卟啉(FEP)、血红蛋白(Hb)显著相关.正常儿童sTfR为12.5～23.5nmol/L.补铁后,ID、IDE与IDA期儿童sTfR含量为(16.37±3.10)nmol/L,明显低于补铁前水平,但在IDE与IDA期没有变化;ID期儿童sTfR/logSF值分别为11.42±3.12、16.54±4.70和23.59±9.93,与补铁前相比均显著降低.结论sTfR为鉴定铁缺乏IDE与IDA期的特异指标,sTfR/logSF为观察补铁效果的敏感指标.

Changes of serum transferrin receptor in children with iron deficiency and its response to iron supplementation

OBJECTIVES: To study the level of serum transferrin receptor (sTfR) in children with different stages of iron deficiency, as well as in the normal children, to observe its response to iron supplementation, and to explore the role of sTfR in surveillance of iron status and assessment of iron supplementation in population. METHODS: By determining iron status index, 1,006 children aged 6-14 years in Fangshan District, Beijing were divided into four groups, control group, iron depletion (ID) group, iron deficiency erythropoiesis (IDE) group and iron deficiency anemia (IDA) group, and 239 of them were measured for sTfR with Quintikine enzyme immunoassay (R&D system, Minneapolis, MN) and sTfR/logserum ferratin (SF) was estimated. Iron supplementation (NaFeEDTA capsules, containing 60 mg iron element per capsule) was administered for the children with ID and IDE per capsule once weekly and for the children with IDA per capsule thrice weekly for nine weeks. Iron status index and sTfR were measured before and after iron supplementation. RESULTS: The levels of sTfR and sTfR/log SF in children with ID, IDE and IDA were (20.03 +/- 2.33) nmol/L, (24.52 +/- 1.07) nmol/L, (33.28 +/- 6.09) nmol/L and (18.15 +/- 5.31), (20.98 +/- 8.88), (29.08 +/- 8.57), respectively, significantly higher than those in the control group [sTfR(18.74 +/- 3.06) nmol/L and sTfR/log SF(9.89 +/- 1.74)]. Statistical analysis showed that sTfR correlated to free erythrocyte protoporphyrin and hemoglobin. sTfR levels in normal children was (12.5-23.5) nmol/L. After iron supplementation, sTfR levels in children with ID was (16.37 +/- 3.10) nmol/L, significantly decreased than those before iron supplementation, but no change in sTfR was observed in children with IDE and IDA. sTfR/log SF were decreased significantly in all children with ID group(11.42 +/- 3.12), IDE (16.54 +/- 4.70) and IDA (23.59 +/- 9.93). CONCLUSION: sTfR is a specific indicator for identifying IDE and IDA, and sTfR/log SF is a sensitive index for assessing the effects of iron supplementation.