甲钴胺及叶酸治疗对2型糖尿病同型半胱氨酸硫内酯解酶活性和血浆同型半胱氨酸水平的影响

目的 探讨甲钴胺、叶酸治疗对2型糖尿病患者血浆同型半胱氨酸（Hcy）及同型半胱氨酸硫内酯解酶（HTase／PON）活性的影响。方法 2型糖尿病患者120例,分为4组,每组30例,组Ⅰ：无干预对照组;组Ⅱ：给予叶酸5mg口服,1次／日;组Ⅲ：给予甲钴胺500μg肌注,17欠／日;组Ⅳ：给予叶酸5mg＋甲钴胺500μg肌注,1次／日;治疗2周。结果 干预组血浆Hcy水平比治疗前均显著下降（P〈0．05）,分别下降为组Ⅳ37．3％,组Ⅲ21．7％,组Ⅱ14．0％,组Ⅰ2．8％（F=28．894P=0．000）;血清HTase／PON活性均显著升高（均P〈0．05）,分别升高为组Ⅳ17．6％,组Ⅱ8．0％．组Ⅲ3．4％,组Ⅰ2．7％（F=36．100,P=0．000）。结论 甲钴胺降低血浆Hcy作用显著;联合用药对Hcy及HTase／PON的作用显著优于单独用药。叶酸可能通过其抗氧化特性间接影响HTase／PON活性。

Effects of intervention therapy of methylcobalamin and folic acid on plasma homocysteine concentration and homocysteine thiolactonases/paraoxonase activity in patients with type 2 diabetes mellitus

OBJECTIVE: To study the effects of methylcobalamin and folic acid treatment on plasma homocysteine (Hcy) level and homocysteine thiolactonase/paraoxonase (HTase/PON) activity in patients with type 2 diabetes mellitus. METHODS: 120 patients with type 2 diabetes mellitus were randomly divided into four equal groups: Group I, receiving no intervention therapy as control group, Group II, given folic acid orally (5 mg/d), Group III, receiving intramuscular injection of methylcobalamin (500 microg qd), and Group IV, treated with methylcobalamin (500 microg qd) in addition to folic acid (5 mg/d). Forty healthy age-matched persons were used as normal controls. Before and 12 weeks after 2-week treatment, plasma total Hcy, vitamin B(12), folic acid, and HTase/PON activity were assayed. RESULTS: After 12-week treatment the plasma folic acid and methylcobalamin, and Hcy levels decreased and serum HTase/PON activity increased significantly in the three groups receiving intervention treatment (all P < 0.05). The Hcy level decreased by 2.8% in Group I, 14.0% in Group II, 37.3% in Group III, and 21.7% in Group IV respectively (all P < 0.01). The HTase/PON activity increased by 2.7% in Group I, 8.0% in Group II, 3.4% in Group III, and 17.6% in Group IV respectively (all P < 0.05). CONCLUSION: Methylcobalamin and folic acid treatment alone can decrease the Hcy level and increase the HTase/PON activity in the patients with type 2 diabetes mellitus, and the methylcobalamin and folic acid combination therapy is much more effective. Folic acid may affect the HTase/PON activity through its antioxidant ability.