Disclosed are a crosslinked gelatin microspheres containing CSF and a water soluble CSF-gelatin conjugate. Both the microspheres and the water soluble conjugate provide an improved CSF stability. They have a high potentiation on the antitumor activity of macrophages in respect of the CSF amount and the time required for macrophage activation and are effective in maintaining their activated state for a long period, compared with the native CSF. The mechanism of macrophage activation by the microspheres containing CSF is mediated via phagocytosis and different from that by native CSF, which is believed to activate macrophages via cell surface receptor. The species specificity of CSF may be absrogated when the CSF is internalized into macrophages through hagocytosis.
本发明公开了一种含有 CSF 的交联明胶微球和一种
水溶性 CSF-明胶共轭物。微球和
水溶性共轭物都能提高 CSF 的稳定性。与原生 CSF 相比,它们对巨噬细胞的抗肿瘤活性具有很高的增效作用,与巨噬细胞活化所需的 CSF 量和时间相比,它们能长期有效地维持巨噬细胞的活化状态。含有 CSF 的微球激活巨噬细胞的机制是通过吞噬作用介导的,与原生 CSF 不同,原生 CSF 被认为是通过细胞表面受体激活巨噬细胞的。当 CSF 通过吞噬作用内化到巨噬细胞中时,CSF 的物种特异性可能会消失。