三种不同的基于99mTc的模拟毒液制剂用于外周蛇咬伤环境临床前模型淋巴闪烁扫描研究的评价

IF 1.3 4区 医学 Q4 PHARMACOLOGY & PHARMACY
Nidhi Tiwari , Abhinav Jaimini , Gaurav Kumar Jain , Geeta Aggarwal , Gaurav Mittal
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引用次数: 0

摘要

蛇咬伤是许多国家的主要公共卫生问题之一;世界卫生组织将其列为“被忽视的热带疾病”,并强调需要制定新的治疗策略,在2030年底前降低死亡率和残疾率。由于毒液的主要成分;高分子量(HMw)毒素通过淋巴系统进入血液,研究的重点是在局部应用合适的候选药物后调节淋巴流速。本研究比较了三种放射性药物,即99mTc-硫胶体(SC)、99mTc-菲酸盐(Phy)和99mTc-人血清白蛋白(HSA),作为模拟毒液剂,在外周蛇咬伤环境的临床前模型中使用淋巴闪烁扫描研究淋巴流速的调节。该研究在72只Sprague-Dawley大鼠中进行;分为6组,每组12只。对照组将99mTc-Phy/999mTc-SC/99mTc-HSA皮内注射(在100μl生理盐水中1.29–1.48 MBq)到尾巴中,作为“模拟毒液”。在各试验组中,在皮内注射放射性药物后20秒内,立即将含有硝苯地平(Nif;0.3%w/w)和利多卡因(Lid;1.5%w/w)的市售局部制剂(Anoblis®乳膏)局部应用于动物的下半身(尾巴和后肢)。使用淋巴闪烁扫描法评估从外周到全身循环的淋巴转移时间的任何调节,方法是在注射受试放射性药物后1小时内分别拍摄60秒的动态伽马闪烁扫描图像。三种放射性药物在淋巴运动方面存在显著差异。在对照组和试验干预组中,99mTc-Phy没有显示出显著的淋巴管移动,并且肝脏微弱可见。在99mTc-SC的情况下,与对照组相比,试验干预组局部应用Nif/Lid后放射性示踪剂的运动发生了显著变化(P<;0.05)。对照组(5±1个淋巴结)和试验干预组(3±1个LNs)可以清楚地看到多个淋巴结(LNs)。肝摄取在对照动物中更为显著,在试验干预组中显著降低。另一方面,与99mTc-SC相比,99mTc-HSA在肝脏中显示出较少的淋巴结数量和较高的积聚,这表明这种放射性药物的运动非常快。结果表明,99mTc-SC可作为模拟蛇毒HMw毒素组分淋巴转运行为的合适试剂,因此可作为研究任何试验药物干预对调节淋巴转运速率影响的模型。额外的优势可能是显著减少牺牲大量动物的需要,特别是在药物开发周期的初始筛选阶段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of three different 99mTc-based mock-venom agents for lymphoscintigraphy studies in preclinical models of peripheral snakebite envenomation

Snakebite envenomation is one of the major public health concerns across many countries; with the WHO designating it as a ‘priority neglected tropical disease’ and stressing for a need to develop novel therapeutic strategies to reduce death and disability rate by end of 2030. Since a major component of venom; the high molecular weight (HMw) toxins enter the bloodstream through lymphatic system, research is focusing on modulating the lymphatic flow rate after topical application of suitable drug candidates. Present study compared the suitability of three radiopharmaceutical agents, namely 99mTc-Sulfur colloid (SC), 99mTc-Phytate (Phy) and 99mTc-Human serum albumin (HSA), to be used as mock-venom agent in studying modulation in lymphatic flow rate in preclinical models of peripheral snakebite envenomation using lymphoscintigraphy studies. The study was performed in 72 Sprague Dawley rats; divided into six groups of 12 rats each. Control groups were given intradermal injection (1.29–1.48 MBq in 100 μl normal saline) of either 99mTc-Phy/ 99mTc-SC/ 99mTc-HSA into the tail as ‘mock-venom’. In respective test groups, commercially available topical formulation (Anobliss® Cream) containing Nifedipine (Nif; 0.3% w/w) and Lidocaine (Lid; 1.5% w/w) was applied topically over the animals' lower body (tail and hind limbs) immediately within 20s of administering intradermal injection of the radiopharmaceutical. Any modulation in lymph transit time from periphery to systemic circulation was assessed using lymphoscintigraphy by taking dynamic gamma-scintigraphy images of 60s each till 1 h post-injection of the test radiopharmaceuticals. Significant difference in movement of the three radiopharmaceuticals was noted in terms of their lymphatic movement. 99mTc-Phy did not show significant travel through the lymphatics and the liver was faintly visualized in control as well as test intervention groups. In case of 99mTc-SC, significant changes in movement of the radiotracer after topical application of Nif/Lid in the test intervention groups were clearly noted in comparison to control (P < 0.05). Multiple numbers of lymph nodes (LNs) could be clearly visualized in control (5 ± 1 LNs) and test intervention groups (3 ± 1 LNs). Liver uptake was more prominent in control animals and it reduced significantly in test intervention groups. On the other hand, 99mTc-HSA showed lesser number of lymph nodes and higher accumulation in liver as compared to 99mTc-SC, suggesting very fast movement of this radiopharmaceutical. Results indicates that 99mTc-SC could be used as a suitable agent to mimic lymphatic transit behavior of HMw toxin components of snake venom and could therefore be used as a model in studying the effect of any test pharmacological intervention in modulating lymphatic transit rate. Additional advantage could be a significant reduction in the need for sacrificing large number of animals, particularly during initial screening phase of drug development cycle.

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来源期刊
Journal of pharmacological and toxicological methods
Journal of pharmacological and toxicological methods PHARMACOLOGY & PHARMACY-TOXICOLOGY
CiteScore
3.60
自引率
10.50%
发文量
56
审稿时长
26 days
期刊介绍: Journal of Pharmacological and Toxicological Methods publishes original articles on current methods of investigation used in pharmacology and toxicology. Pharmacology and toxicology are defined in the broadest sense, referring to actions of drugs and chemicals on all living systems. With its international editorial board and noted contributors, Journal of Pharmacological and Toxicological Methods is the leading journal devoted exclusively to experimental procedures used by pharmacologists and toxicologists.
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