School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China.
Sci China Life Sci. 2010 Apr;53(4):504-10. doi: 10.1007/s11427-010-0093-5. Epub 2010 May 7.
The injury of central nervous system (CNS) usually causes the cavity formation. Although transplantation of neural stem/precursor cells (NSPCs) into the lesioned area of CNS has been shown to be implicated in the functional restoration, the therapeutic result is limited by the poor survival of NSPCs as well as their insufficient proliferation and differentiation abilities. Type-1 collagen is considered as a candidate scaffold or drug delivery system to overcome the aforementioned obstacle. This study observed the effects of the CNTF (ciliary neurotrophic factor)-collagen gel-controlled delivery system and daily addition of soluble-form CNTF on the NSPC survival, migration, proliferation and differentiation. The results showed that, within 12 h of the initial co-culture, CNTF was released in a burst pattern, then the CNTF-collagen gel-controlled delivery system stably released CNTF for up to 12 d. The cell viability test, together with immunohistochemistry, RT-PCR and Western blotting, showed that the CNTF-collagen gel-controlled delivery system supported the NSPCs seeded on the surface of collagen gel survival and facilitated their migration and proliferation. The daily addition of soluble-form CNTF to the medium had similar effects to the CNTF-collagen gel-controlled delivery system, but large quantities of soluble-form CNTF were consumed during the entire process. Taken together, the CNTF-collagen gel-controlled delivery system not only provides a physical scaffold for the transplanted NSPCs to adhere and migrate, but also facilitates the NSPC survival, growth and proliferation, simultaneously reducing the consumption of the expensive growth factors. This system may be used to enhance the microenvironment in the lesioned area of CNS.
中枢神经系统(CNS)损伤通常会导致腔形成。尽管将神经干细胞/前体细胞(NSPCs)移植到 CNS 的损伤区域已被证明与功能恢复有关,但治疗效果受到 NSPCs 存活率低以及其增殖和分化能力不足的限制。I 型胶原被认为是克服上述障碍的候选支架或药物传递系统。本研究观察了 CNTF(睫状神经营养因子)-胶原凝胶控释系统和可溶性 CNTF 每日添加对 NSPC 存活、迁移、增殖和分化的影响。结果表明,在初始共培养的 12 小时内,CNTF 呈爆发式释放,然后 CNTF-胶原凝胶控释系统稳定释放 CNTF 长达 12 天。细胞活力测试以及免疫组织化学、RT-PCR 和 Western blot 显示,CNTF-胶原凝胶控释系统支持接种在胶原凝胶表面的 NSPCs 存活,并促进其迁移和增殖。可溶性 CNTF 每日添加到培养基中具有与 CNTF-胶原凝胶控释系统相似的作用,但在整个过程中会消耗大量可溶性 CNTF。总之,CNTF-胶原凝胶控释系统不仅为移植的 NSPC 提供了附着和迁移的物理支架,还促进了 NSPC 的存活、生长和增殖,同时减少了昂贵生长因子的消耗。该系统可用于增强 CNS 损伤区域的微环境。
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