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DPP-4抑制剂LGT-6在不同种属血浆中蛋白结合率的比较 Δ
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廖伟科 1,2* ,杨华丽 ,王忠元 ,陈 瑞 ,汤 磊 ,崔 杏 ,朱高峰 (1.贵州省化学合成药物研发利用工程
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技术研究中心,贵阳 550004;2.贵州医科大学药学院,贵阳 550004;3.贵州省人民医院药剂科,贵阳
550002)
中图分类号 R969.1 文献标志码 A 文章编号 1001-0408(2021)14-1728-06
DOI 10.6039/j.issn.1001-0408.2021.14.11
摘 要 目的:建立二肽基肽酶4抑制剂LGT-6在不同种属血浆中蛋白结合率的测定方法并比较差异。方法:采用平衡透析法,
以磷酸盐缓冲液为透析外液,将3、30、300、3 000 nmol/L的LGT-6分别在大鼠、猴、人血浆(即透析内液)中平衡48 h。以甲苯磺丁
脲为内标,采用超高效液相色谱-串联质谱法测定透析内、外液中LGT-6的浓度,计算血浆蛋白结合率。以ACQUITY UPLC HSS
T3为色谱柱,以水(含0.01%甲酸)-乙腈(含0.01%甲酸)为流动相进行梯度洗脱,流速为0.6 mL/min,柱温为40 ℃,进样量为2 μL;
离子源为电喷雾离子源,监测模式为多反应监测模式,采集模式为正离子模式,定量分析用离子对分别为 m/z 487.0→434.3
(LGT-6)、m/z 271.1→172.0(内标)。结果:在 3、30、300、3 000 nmol/L 浓度下,LGT-6 在大鼠血浆中的蛋白结合率分别为(96.25±
0.97)%、(84.16±1.24)%、(78.25±0.61)%、(66.63±0.95)%,在猴血浆中的蛋白结合率分别为(98.54±0.58)%、(87.27±
1.01)%、(79.35±0.86)%、(66.69±0.54)%,在人血浆中的蛋白结合率分别为(99.40±1.03)%、(84.48±1.15)%、(77.62±
0.77)%、(66.93±0.48)%。在相同浓度下,LGT-6在大鼠、猴和人血浆中的蛋白结合率没有明显差异(P>0.05);在相同种属血浆
中,不同浓度LGT-6的血浆蛋白结合率组间比较差异有统计学意义(P<0.05),且有随药物浓度的升高而降低的趋势。结论:成功
建立了测定LGT-6血浆蛋白结合率的方法。在相同浓度下,LGT-6在大鼠、猴、人血浆中的蛋白结合率没有明显的种属差异,但有
明显的浓度依赖趋势。
关键词 二肽基肽酶4抑制剂;LGT-6;平衡透析法;超高效液相色谱-串联质谱法;血浆蛋白结合率;不同种属血浆
Comparison of Protein Binding Rate of DPP-4 Inhibitor LGT-6 in Different Species of Plasma
LIAO Weike ,YANG Huali ,WANG Zhongyuan ,CHEN Rui ,TANG Lei ,CUI Xing ,ZHU Gaofeng 1,2
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(1. Guizhou Provincial Engineering Technology Research Center for Chemical Drug R&D,Guiyang 550004,
China;2. College of Pharmacy,Guizhou Medical University,Guiyang 550004,China;3. Dept. of Pharmacy,
Guizhou Provincial People’s Hospital,Guiyang 550002,China)
ABSTRACT OBJECTIVE:To establish the method for determining protein binding rate of dipeptidyl peptidase-4 inhibitor LGT-6
in different species of plasma,and to compare their difference. METHODS:By equilibrium dialysis,LGT-6(3,30,300,3 000
nmol/L)was equilibrated in rat,monkey and human plasma(i. e. internal dialysis solution)for 48 h,using phosphate buffer as the
external dialysis solution. The concentration of LGT-6 in internal and external dialysis solution was determined by UPLC-MS/MS
using tolbutamide as internal standard,and the plasma protein binding rate was calculated. The determination was performed on
ACQUITY UPLC HSS T3 column with water (containing 0.01% formic acid)-acetonitrile (containing 0.01% formic acid) as
mobile phase at the flow rate of 0.6 mL/min. The column temperature was 40 ℃,and the sample size was 2 μL. The ion source
was electrospray ion source,and the multiple ion monitoring mode was used to carry out positive ionization scanning. The ion pairs
for quantitative analysis were m/z 487.0→434.3(LGT-6),m/z 271.1→172.0(internal standard),respectively. RESULTS:At the
concentrations of 3,30,300,and 3 000 nmol/L,the protein binding rates of LGT-6 in rat plasma were(96.25±0.97)%,(84.16±
1.24)%,(78.25±0.61)%,(66.63±0.95)%;the protein protein binding rates in monkey plasma were(98.54±0.58)%,(87.27±
1.01)% ,(79.35 ± 0.86)% ,(66.69 ± 0.54)% ;the protein binding rates in human plasma were (99.40 ± 1.03)% ,(84.48 ±
1.15)%,(77.62±0.77)%,(66.93±0.48)%. At the same concentration,the protein binding rates of LGT-6 in rat,monkey and
human plasma had no significant difference(P>0.05). In the same species of plasma,there were significant differences in the
plasma protein binding rates of different concentration of
Δ 基金项目:贵州省科技计划项目(No.黔科合支撑〔2019〕2761
LGT-6 among those groups(P<0.05),and it decreased with
号);贵州省高层次创新型人才“百层次人才”项目(No.黔科合平台人
the increase of drug concentration. CONCLUSIONS: The
才〔2016〕4015)
*副教授,硕士生导师,博士。研究方向:创新药物研发。电话: method for the determination of plasma protein binding rate of
0851-86908318。E-mail:641212891@qq.com LGT-6 is successfully established. The data revealed that the
# 通信作者:高级实验师,硕士生导师,硕士。研究方向:药物分 protein binding rate of LGT-6 is concentration-dependent,
析与药动学。电话:0851-86908318。E-mail:64949824@qq.com there was no obvious species difference on protein binding
·1728 · China Pharmacy 2021 Vol. 32 No. 14 中国药房 2021年第32卷第14期