Variations of serum bone resorption biomarkers of children of the coal-burning fluorosis area / 中国学校卫生

Objective@#To investigate the concentration of serum bone resorption markers NTX and TRACP-5b of children aged 8-14 years in a coal-burning fluorosis area and its relationship with age, and to provide population data for the study of pathogenesis of skeletal fluorosis.@*Methods@#Totally 123 children of 8-14 schoolage in the two primary schools in Doujing Township, Shuicheng County, Liupanshui City, Guizhou Province were randomly selected as the exposed group. According to the matching principle, 64 children were randomly selected as a control from a primary school in a nondisease area Huaga Town. The dental fluorosis was investigated, and the concentrations of serum NTX and TRACP-5b were measured.@*Results@#The detection rate of dental fluorosis in the fluorosis area was 94.3% and 0 in the control area. The concentrations of serum NTX in fluorosis area children were 13.04 (10.76, 15.64), 14.82 (12.15, 18.26)nmol/L in the early adolescence and middle-aged period, which lower than the control area 15.73(14.36, 18.61), 16.45(15.45, 22.02)nmol/L( P <0.05); The serum TRACP-5b levels in children with fluorosis were 276.74(237.63, 312.75), 270.14(242.82, 321.97), 305.95(259.78, 339.87)nmol/L in prepubertal, early adolescence and middle youth, lower than the control area 370.88 (304.47, 452.84), 353.30 (262.05, 393.19), 420.22 (376.96, 544.60)nmol/L( Z =-3.03, -2.66, -3.10, P <0.05). Serum NTx and TRACP-5b in fluorosis area were negatively correlated with dental fluorosis in children( r =-0.51, -0.37, P <0.01).@*Conclusion@#Fluorosis can reduce the concentrations of serum bone resorption markers NTX and TRACP-5b in children of different age groups. TRACP-5b may be more sensitive to fluoride exposure than NTX, but the specific mechanism remains to be further studied.