(3)NE+IFN-DMEM(-6M,50ng)
NE---A液(1μg/μl,1mg/ml) 20.5μl
IFN-γ(25ng/μl) 25 μl
DMEM UP TO 100 ml
过滤消毒,4℃保存
(4)低血清DMEM培养基(上室)
(5)20%FBS-DMEM培养基(下室)
2、准备
(1)溶胶,4℃过夜(Thaw Matrigel at 4℃ overnight.)
(2)室温下基质胶易成凝胶,所以,步骤2和3种使用试管和枪头要在试验前-20C预冷。(Matrigel tends to form gel
very quickly at room temerature, therefore, pipets and tips using in
steps 2 and 3 have to be chilled at prior to experiements.)
3、包被基底膜(冰上操作)
(1)用无血清的冷细胞培养基DMEM稀释Matrigel胶(10mg/ml to 5 mg/ml)) (Dilute Matrigel
(10mg/ml to 5 mg/ml) in serum free-cold cell culture media (RPMI1640,
EMEM, DMEM, etc).)
(2)取100ul稀释胶加到24-well transwell上室中 (Put 100 ul of the diluted matrigel into upper chamber of 24-well transwell)
(3)37℃孵育transwell至少4-5h (Incubate the transwell at 37C at least 4 to 5 h for gelling.)
4、水化基底膜
用无血清培养基轻洗凝胶 (Gently wash gelled matrigel with warmed serum free-culture media.)
5、准备细胞悬液和小室
(1)消化法从细胞培养瓶中获取细胞; (Harvest cells from tissue culture flasks by Trypsin/EDTA;)
(2)用培养基洗3遍(Wash the cells 3 times with culture media (RPMI1640, EMEM, DMEM etc) containing 1 % FBS.)
(3)重悬细胞,5×105 cells/ml,1% FBS (Resuspend the cells in media containing 1% FBS at a density of 5×105 cells/ml.)
(4)上室加200 ul细胞悬液 (Put 200 ul of the cell suspension onto the matrigel.)
(5)下室中加入600 ul细胞培养基,含有5 ug/ml fibronectin作为黏连亚族 (lower chamber of the
transwell is filled with 600 ul of culture media containing, as an
adhesive subtrate.)
6、孵育,37℃,20 to 24 h (Incubate at 37C for 20 to 24 h.
7、染色和计数
(1)棉签擦去上室上面的非侵袭细胞(Scrape off noninvaded cells on the top of the transwell with a cotton swab)
(2)移去transwells,倒置,风干(Remove transwells from 24-well plates and stained with Diff-Quick solution.)
(3)24孔板中加入500µl含0.1%结晶紫,将小室置于其中,使膜浸没在培养基中,37℃ 30min后取出,PBS清洗。
(4)直径上取4个视野,照相,计数。
(5)24孔板中加入500µl 33%醋酸,将小室置于其中,浸膜,振荡10min,充分溶解。取出小室,24孔板于酶标仪上570nm测OD值,间接反应细胞数。
小技巧:照相前一定要晾干,照相时将小室正置于载玻片上,在倒置显微镜下观察、照相。经济、实用、方便。