Adhesion and growth of CaCo2 cells on surface-modified PEEK substrata

A series of surface-functionalized poly(ether ether ketone) (PEEK) films has been prepared by selective wet-chemistry; they are hydroxylated polymer (PEEK-OH) obtained by reduction, aminated polymer (PEEK-[]-NH2) prepared by coupling a diisocyanate reagent to PEEKOH (PEEK-[]-NCO) followed by hydrolysis, and carboxylated and aminocarboxylated polymers (PEEK-[]-GABA and PEEK-Lysine) resulting from the coupling of aminoacids to PEEK-[]-NCO. The aminated and carboxylated substrata promoted the adhesion and growth of CaCo2 cells in the presence of serum. Fibronectin (FN), an extra-cellular matrix protein, has been covalently fixed and/or adsorbed on various PEEK substrata, in the presence or not of a polymeric surfactant (Pluronic F68). The performances of the FN-grafted substrata (PEEK-[]-FN(1) and PEEK-[]-FN(2)) were significantly higher than those of reference substrata simply coated with FN (PEEK-OH(+FN)(1) and (2), PEEK-[]-NH2(+FN)(1) and (2)), considering the adhesion and spreading of CaCo2 cells in the absence of serum. Moreover, the stability of the adherent cells on the FN-adsorbed substrata dramatically depended on the experimental conditions applied during the PEEK coating with FN.     

淫羊藿注射液促进鸡胚背根节神经纤维生长的初步研究

用鸡胚背根神经节48枚,随机分成6组。1组为空白(B)组,另5组为实验(T_2～T_5)组,在其培养液中加入淫羊藿注射液,浓度分别为0.25％、0.5％、1％、2％、4％。连续培养4天。每天测量神经纤维长度,第3天测量神经纤维密度。结果提示,淫羊藿注射液能明显促进神经纤维的生长。体外生长3天时,实验组神经纤维的长度分别为对照组的1.046、1.074、1.154、1.181、1.246倍,密度分别为对照组的1.254、1.316、1.568、1.381、1.487倍,差别显著。在适宜范围内,加药浓度增高,促进效应增强。