中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (22): 3550-3556.doi: 10.3969/j.issn.2095-4344.0919

• 纳米生物材料 nanobiomaterials • 上一篇    下一篇

pH敏感壳聚糖与地塞米松磷酸钠纳米载药体系制备及炎症抑制作用

陈 娜1,谢铁民2,张一凡2,王 江1,王庆峰2   

  1. 1解放军沈阳军区总医院中医科,辽宁省沈阳市 110016;2沈阳师范大学粮食学院,辽宁省沈阳市 110032
  • 收稿日期:2018-06-11 出版日期:2018-08-08 发布日期:2018-08-08
  • 通讯作者: 王庆峰,讲师,沈阳师范大学粮食学院,辽宁省沈阳市 110032
  • 作者简介:陈娜,女,1981年生,辽宁省沈阳市人,汉族,辽宁中医药大学毕业,硕士,药师,主要从事药事管理,中药现代化研究。
  • 基金资助:

    沈阳市科技局,沈阳市科技计划项目(18-013-0-44)

Preparation and inflammation suppression of pH sensitive chitosan/dexamethasone sodium phosphate nano-drug delivery system

Chen Na1, Xie Tie-min2, Zhang Yi-fan2, Wang Jiang1, Wang Qing-feng2   

  1. 1Department of Traditional Chinese Medicine, General Hospital of Shenyang Military Region, Shenyang 110016, Liaoning Province, China; 2College of Grain Science and Technology, Shenyang Normal University, Shenyang 110032, Liaoning Province, China
  • Received:2018-06-11 Online:2018-08-08 Published:2018-08-08
  • Contact: Wang Qing-feng, Lecturer, College of Grain Science and Technology, Shenyang Normal University, Shenyang 110032, Liaoning Province, China
  • About author:Chen Na, Master, Pharmacist, Department of Traditional Chinese Medicine, General Hospital of Shenyang Military Region, Shenyang 110016, Liaoning Province, China
  • Supported by:

    the Science and Technology Research Project of Shenyang, No. 18-013-0-44

摘要:

文章快速阅读:

 

文题释义:
壳聚糖应用于药物运输体系中的特性:具有生物吸附性能;pH敏感,不同的pH条件下释药速率可调;可提高药物的穿透作用,帮助疏水药物通过细胞膜;成胶条件温和,可与多种类型交联剂成胶;易修饰,壳聚糖表面大量羟基和氨基可根据要求修饰。目前壳聚糖应用于药物运输体系中的主要形式有纳米粒、微球和水凝胶。
地塞米松磷酸钠:是肾上腺糖皮质激素药物,参与人体糖、脂肪、蛋白质物质代谢,可制成针剂、口服及外用制剂。同其他糖皮质激素类药物相比,地塞米松磷酸钠属激素类长效药,具有更强的抗炎、抗毒素、抗休克作用,且无留钠、排钾作用,是抢救垂危患者不可缺少的“皮质激素药物之王”。
 
 
背景:在治疗肺部哮喘过程中,地塞米松磷酸钠存在毒性大、体内代谢时间短等问题,因此急需一种以缓释方式给药的地塞米松磷酸钠制剂,以解决上述问题。
目的:制备pH敏感壳聚糖/地塞米松磷酸钠纳米颗粒,考察其载药量、微观形貌、粒径分布及体外释放等特性,同时考察其炎症抑制作用。
方法:以壳聚糖为原料,采用离子凝胶法制备pH敏感壳聚糖/地塞米松磷酸钠纳米颗粒,检测其载药量、微观形貌、粒径分布及体外释放特性。将32只SD大鼠随机分为4组,正常组第0,7天分别皮下注射1 mL生理盐水,第14天起雾化吸入生理盐水1 mL,1次/d,30 min/次,连续7 d;哮喘组第0,7天分别皮下注射1 mL致敏液,第14天起雾化吸入含1%卵白蛋白的生理盐水1 mL,1次/d,30 min/次,连续7 d;对照组激发前30 min腹腔注射地塞米松磷酸钠(0.25 mg/kg),其余同哮喘组;实验组激发前30 min腹腔注射壳聚糖/地塞米松磷酸钠纳米颗粒(地塞米松磷酸钠0.25 mg/kg),其余同哮喘组;14 d后取肺组织,进行苏木精-伊红染色。

结果与结论:①随着地塞米松磷酸钠质量浓度的增加,壳聚糖/地塞米松磷酸钠纳米颗粒载药量逐渐增加;    ②壳聚糖/地塞米松磷酸钠纳米颗粒为白色椭圆形,95%纳米颗粒直径在40-70 nm之间,平均粒径为53.2 nm;③在pH=7.4的模拟肠液中,地塞米松磷酸钠缓慢地从纳米颗粒中出来,120 min后全部释放;在pH=2.1和pH=4.6的模拟胃液中,120 min内没有地塞米松磷酸钠释放出来;④苏木精-伊红染色显示,哮喘组支气管平滑肌肥厚,黏膜充血水肿,并有大量炎症细胞浸润;对照组支气管炎症性有所减轻;实验组支气管炎症明显减轻,支气管壁周围仅有少量炎症细胞浸润;⑤结果表明,pH敏感壳聚糖/地塞米松磷酸钠纳米颗粒具有缓释功能,可抑制哮喘大鼠肺泡灌洗液中炎症细胞的产生。

ORCID: 0000-0002-2467-3205(陈娜)

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

关键词: 壳聚糖, pH敏感性, 载药体系, 地塞米松磷酸钠, 炎症细胞, 生物材料

Abstract:

BACKGROUND: The clinical utilization of dexamethasone sodium phosphate in the treatment of asthma is limited due to its toxicity and short metabolic time, which means, a slow-release preparation of dexamethasone sodium phosphate is a good solution.

OBJECTIVE: To prepare a pH sensitive chitosan/dexamethasone sodium phosphate nanoparticle, and to investigate its drug loading, microstructure, particle size distribution, in vitro release characteristics, and anti-inflammatory effect.
METHODS: Chitosan as raw material was used to prepare pH sensitive chitosan/dexamethasone sodium phosphate nanoparticles by ionic gelation method. Drug-polymer interactions, morphology, particle size distribution and in vitro release characteristics of the nanoparticles were then detected. Thirty-two Sprague-Dawley rats were randomly divided into four groups: the normal group was subcutaneously injected 1 mL of normal saline at days 0 and 7, and inhaled 1 mL of atomized saline, 30 minutes per day, from day 14 to day 21. The asthma group was subcutaneously injected 1 mL of sensitization solution at days 0 and 7, and inhaled 1 mL of atomized saline solution containing 1% ovalbumin, 30 minutes per day, from day 14 to day 21. The control group was intraperitoneally injected dexamethasone sodium phosphate (0.25 mg/kg) at 30 minutes before induction of asthma, and the other procedures were the same as those used in the asthma group. The experimental group was intraperitoneally injected chitosan/dexamethasone sodium phosphate nanoparticles (0.25 mg/kg dexamethasone sodium phosphate) at 30 minutes before induction of asthma, and the other procedures were the same as those used in the asthma group. Lung tissue samples from each rat were taken at day 14 for histological observation using hematoxylin-eosin staining.

RESULTS AND CONCLUSION: (1) With the increase of dexamethasone sodium phosphate concentration, the drug-loading rate of chitosan/dexamethasone sodium phosphate nanoparticles increased gradually. (2) The chitosan/dexamethasone sodium phosphate nanoparticles obtained were white oval, 95% of which had a diameter of 40-70 nm, with the average diameter being 53.2 nm. (3) In the simulated intestine solution (pH=7.4), sodium dexamethasone phosphate was gradually released from the nanoparticles and completely released within 120 minutes. In the simulated gastric juice (pH=2.1 and pH=4.6), no sodium dexamethasone phosphate was released within 120 minutes. (4) Hematoxylin-eosin staining results showed that the bronchial smooth muscle in the asthma group was hypertrophic accompanied by mucosal hyperemia and edema and infiltration of plenty inflammatory cells. Bronchial inflammation was relieved in the control group, and considerably alleviated in the experimental group, where only a small number of inflammatory cells were infiltrated around the bronchial wall. We make a conclusion from these findings that pH-sensitive chitosan/dexamethasone sodium phosphate nanoparticles exhibit a slow-release potential, which can be used to inhibit the production of inflammatory cells in asthmatic rats given broncho-alveolar lavage

Key words: Chitosan, Inflammation, Asthma, Delayed-Action Preparations, Tissue Engineering

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