据美国《大众科学》杂志报道,在癌症转移或扩散到全身之前捕获癌症是一种增加癌症患者生存率的方法。如今科学家发现了一种办法,即使在癌症已经转移或扩散时,仍旧可利用磁铁粒子来俘获癌细胞,并将它们“拉”出体外。美国乔治亚州工学院的研究人员通过研究表明,磁性纳米粒子——微小的磁金属粒子可以用于吸附癌细胞,之后在其它磁铁的作用下将它们移到体外。
此研究成果发表在7月刊的《美国化学会志》(JACS)上。它描述了二项实验,在第一项实验中,研究人员将子宫癌细胞注入到老鼠体内,在注入之前,科学家对此癌细胞进行了染色,并让癌细胞只和与癌症细胞而非常规细胞结合的蛋白质所吸附。在第二项实验中,研究人员轻轻按摩老鼠促使此癌细胞扩散,接着研究人员用将一块磁铁放在老鼠的腹部达30秒钟。增长的癌细胞可以透过老鼠皮肤清晰可见,而此可见位置正好位于此磁铁放置的地方。
利用循环泵系统,研究人员还能展示磁铁能将增长的癌细胞拖拉到塑料管的一侧,表明转移的癌细胞可能已经被移出了体外,通过过滤,就能消除任何磁化了的癌细胞。
此研究表明这一技术可以潜在地应用于其它癌症治疗手段的辅助治疗中,如手术和化疗。但在实际应用之前,还需进行更多的研究来评估此技术的毒副作用,之后还要进行临床实验来检测此粒子有没有副作用。(生物谷Bioon.com)
生物谷推荐原始出处:
JACS,doi:10.1021/ja801969b,Kenneth E. Scarberry,Z. John Zhang
Magnetic Nanoparticle−Peptide Conjugates for in Vitro and in Vivo Targeting and Extraction of Cancer Cells
Kenneth E. Scarberry,† Erin B. Dickerson,‡§ John F. McDonald,‡§ and Z. John Zhang*†
School of Chemistry and Biochemistry, School of Biology, Ovarian Cancer Institute, Georgia Institute of Technology, Atlanta, Georgia 30332
john.zhang@chemistry.gatech.edu
Abstract:
Magnetic cobalt spinel ferrite nanoparticles coated with biocompatible polygalacturonic acid were functionalized with ligands specific for targeting expressed EphA2 receptors on ovarian cancer cells. By using such magnetic nanoparticle−peptide conjugates, targeting and extraction of malignant cells were achieved with a magnetic field. Targeting ovarian cancer cells with receptor specific peptide-modified magnetic nanoparticles resulted in cell capture from a flow stream in vitro and from the peritoneal cavity of mice in vivo. Successful removal of metastatic cancer cells from the abdominal cavity and circulation using magnetic nanoparticle conjugates indicate the feasibility of a dialysis-like treatment and may improve long-term survival rates of ovarian cancer patients. This approach can be applied for fighting other cancers, such as leukemia, once the receptors on malignant cells are identified and the efficacy of targeting ligands is established.