Changes in bone mineral density, bone metabolism and its influencing factors in early-onset type 2 diabetes mellitus
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摘要:
目的 研究早发2型糖尿病(T2DM)骨密度、骨代谢水平改变并探讨其影响因素。 方法 选取2018年1月—2021年12月在上海交通大学医学院附属新华医院内分泌科住院的初诊年龄≤40岁的2型糖尿病患者201例为早发组,另以本院与早发组年龄、性别相匹配的非糖尿病患者107例为对照组。比较2组一般临床资料及腰椎L1~4平均骨密度(BMD)、骨代谢水平差异。 结果 (1)校正BMI后,早发组与对照组BMD比较差异无统计学意义(F=1.004,P>0.05),早发组1型原胶原氨基端前肽(P1NP)、骨钙素、25(OH)D3、甲状旁腺激素均低于对照组(t=3.941、6.556、7.123、4.620,均P<0.05),2组1型胶原羧基端肽β特殊序列(β-CTX)比较差异无统计学意义(t=1.684,P>0.05)。(2)影响因素分析结果显示,BMD与年龄呈独立负相关关系(95% CI:-0.007~-0.001,P=0.012),与BMI(95% CI:0.004~0.014,P=0.001)、糖化血红蛋白(95% CI:0.002~0.021,P=0.014)呈独立正相关关系;β-CTX与年龄(95% CI:-0.013~-0.003,P=0.001)、TC(95% CI:-0.079~-0.015,P=0.004)呈独立负相关关系,女性(95% CI:-0.177~-0.020,P=0.014)是β-CTX降低的独立危险因素;P1NP与年龄(95% CI:-0.831~-0.137,P=0.007)、空腹血糖(95% CI:-1.815~-0.333,P=0.005)、TG(95% CI:-0.635~-0.508,P=0.004)呈独立负相关关系。 结论 早发2型糖尿病患者的骨密度与非糖尿病人群相比未见明显差异,但骨形成标志物降低,年龄、性别、BMI、血糖、血脂水平是其骨密度、骨代谢水平改变的独立影响因素。 Abstract:Objective To analyse the changes in bone mineral density, bone metabolism and its influencing factors in early-onset type 2 diabetes mellitus (T2DM). Methods We performed a retrospective analysis of 201 patients with T2DM who were diagnosed with diabetes aged ≤ 40 years old in the Department of Endocrinology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine from January 2018 to December 2021. These subjects were classified as the early-onset group. In addition, we selected 107 non-diabetic patients matched with the early-onset group with regard to age and sex ratio as the control group. The general clinical data, biochemical indexes, mean bone mineral density (BMD) of lumbar spine L1-4 and bone metabolism markers were compared between the two groups. Results (1) After correcting the BMI, no statistically significant difference in BMD was observed between the early-onset group and control group (F=1.004, P>0.05). The levels of type Ⅰ procollagen amino-terminal peptide, osteocalcin, 25(OH)D3 and parathyroid hormone of the early-onset group were lower than those in the control group (t=3.941, 6.556, 7.123, 4.620, all P < 0.05), whereas no significant difference in β-carboxyl terminal peptide (β-CTX) was found between the two groups (t=1.684, P>0.05). (2) Correlation analysis results showed that BMD was independently and negatively correlated with age (95% CI: -0.007 to -0.001, P=0.012) but was independently and positively correlated with BMI (95% CI: 0.004 to 0.014, P=0.001) and HbA1c (95% CI: 0.002 to 0.021, P=0.014). β-CTX was independently and negatively correlated with age (95% CI: -0.013 to -0.003, P=0.001) and TC (95% CI: -0.079 to -0.015, P=0.004). In addition, the female gender was an independent risk factor for decreased β-CTX (95% CI: -0.177 to -0.020, P=0.014). P1NP was independently and negatively correlated with age (95% CI: -0.831 to -0.137, P=0.007), FPG (95% CI: -1.815 to -0.333, P=0.005) and TG (95% CI: -0.635 to -0.508, P=0.004). Conclusion There is no significant difference in BMD amongst patients with early-onset type 2 diabetes compared with non-diabetic people, but the markers of bone formation decrease. The age, gender, BMI, blood glucose and blood lipid levels are independent influencing factors of changes in BMD and bone metabolism in patients. -
表 1 2组研究对象一般临床资料比较
Table 1. Comparison of general clinical data between two groups
组别 例数 性别(男/女, 例) 年龄(x±s, 岁) BMI(x±s) SBP(x±s, mm Hg) DBP(x±s, mm Hg) 吸烟[例(%)] 早发组 201 146/55 38.13±7.10 27.11±4.53 129.04±15.66 83.33±11.56 46(22.89) 对照组 107 77/30 38.93±5.87 24.94±3.24 124.81±12.66 77.90±9.44 16(14.95) 统计量 0.016a -1.057b 5.072b 2.564b 4.658b 2.733a P值 0.900 0.291 <0.001 0.011 <0.001 0.098 组别 例数 饮酒[例(%)] 高血压[例(%)] 心脑血管疾病[例(%)] 动脉粥样硬化斑块[例(%)] 脂肪肝[例(%)] 早发组 201 16(7.96) 55(27.36) 30(14.92) 76(37.81) 128(63.68) 对照组 107 8(7.48) 20(18.69) 9(8.41) 37(34.58) 34(31.78) 统计量 0.023a 2.850a 2.679a 0.314a 28.510a P值 0.880 0.091 0.528 0.575 <0.001 注:1 mm Hg=0.133 kPa;a为χ2值,b为t值。 表 2 2组研究对象生化指标比较
Table 2. Comparison of biochemical indexes between two groups
组别 例数 ALT [M(P25, P75),U/L] AST [M(P25, P75),U/L] 尿酸[M(P25, P75),μmol/L] TC (x±s,mmol/L) TG[M(P25, P75),mmol/L] 早发组 201 26.00(16.00, 41.00) 20.00(15.00, 32.00) 353.00(294.00, 425.00) 4.91±1.10 2.00(1.27, 3.25) 对照组 107 22.00(13.00, 37.00) 20.00(16.00, 26.50) 360.00(276.50, 431.00) 4.58±0.99 1.53(0.97, 2.33) t值 -2.356a -0.192a -0.252a 2.583b -3.581a P值 0.018 0.847 0.801 0.010 <0.001 组别 例数 LDL-C (x±s, mmol/L) HDL-C[M(P25, P75),mmol/L] Scr (x±s, μmol/L) eGFR[x±s, mL/(min·1.73m2)] Ca (x±s, mmol/L) Mg (x±s, mmol/L) P (x±s, mmol/L) 早发组 201 2.97±0.91 0.95(0.83, 1.15) 58.64±17.56 135.57±40.69 2.21±0.10 0.85±0.09 1.26±0.18 对照组 107 2.72±0.82 1.15(1.00, 1.37) 63.18±14.80 113.07±21.12 2.23±0.12 0.91±0.07 1.15±0.16 t值 2.433b -5.254a -2.274b 6.302b -1.205b -7.227b 5.362b P值 0.016 <0.001 0.024 <0.001 0.230 <0.001 <0.001 注:a为Z值,b为t值。 表 3 2组研究对象骨密度、骨代谢指标比较(x±s)
Table 3. Comparison of bone mineral density and bone metabolism between two groups(x±s)
组别 例数 BMDa(g/cm3) β-CTX(ng/mL) P1NP(ng/mL) OC(ng/mL) 25(OH)D3(nmol/L) PTH(pmol/L) 早发组 201 1.189±0.010 0.46±0.27 42.64±18.68 11.18±5.86 33.98±11.88 3.86±1.48 对照组 107 1.170±0.014 0.51±0.27 52.01±22.40 15.75±5.68 48.53±19.27 4.76±1.87 统计量 1.004b 1.684c 3.941c 6.556c 7.123c 4.620c P值 0.317 0.093 <0.001 <0.001 <0.001 <0.001 注:a为校正BMI后;b为F值,c为t值。 表 4 早发T2DM患者骨密度和骨代谢指标与各因素的相关性分析
Table 4. Correlation analysis of bone mineral density and bone metabolism indexes with various factors in patients with early-onset T2DM
项目 BMD β-CTX P1NP r值 P值 r值 P值 r值 P值 病程(年) -0.007 0.919 -0.103 0.146 0.010 0.883 年龄(岁) -0.249 <0.001 -0.243 0.001 -0.165 0.019 BMI 0.314 <0.001 0.046 0.518 0.011 0.876 HbA1c(%) 0.218 0.002 0.074 0.298 -0.148 0.036 FPG(mmol/L) 0.090 0.203 -0.089 0.211 -0.226 0.001 TC(mmol/L) 0.030 0.677 -0.226 0.001 -0.228 0.001 TG(mmol/L) 0.179 0.011 -0.164 0.020 -0.242 0.001 LDL-C(mmol/L) -0.097 0.171 -0.110 0.120 -0.077 0.279 HDL-C(mmol/L) -0.135 0.055 -0.139 0.049 0.010 0.890 Ca(mmol/L) 0.078 0.269 0.075 0.290 0.049 0.490 Mg(mmol/L) -0.102 0.152 -0.003 0.969 0.092 0.193 P(mmol/L) 0.094 0.183 -0.037 0.605 -0.030 0.676 表 5 早发2型糖尿病患者骨密度、骨代谢指标与各因素的多元线性回归分析
Table 5. Multiple linear regression analysis of bone mineral density, bone metabolism indexes and various factors in patients with early-onset type 2 diabetes mellitus
因变量 自变量 B β SE t值 P值 BMD 年龄 -0.004 -0.172 0.002 -2.526 0.012 BMI 0.009 0.238 0.003 3.476 0.001 HbA1c 0.012 0.164 0.005 2.470 0.014 β-CTX 年龄 -0.008 -0.223 0.003 -3.335 0.001 女性 -0.099 -0.166 0.040 -2.487 0.014 TC -0.047 -0.196 0.016 -2.921 0.004 P1NP 年龄 -0.484 -0.184 0.176 -2.749 0.007 TG -1.572 -0.200 0.539 -2.914 0.004 FPG -1.074 -0.197 0.376 -2.858 0.005 注:性别赋值女性=1、男性=0;其余连续变量均以实际值赋值。 -
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