Biology
This content is Free Access.
The JoVE video player is compatible with HTML5 and Adobe Flash. Older browsers that do not support HTML5 and the H.264 video codec will still use a Flash-based video player. We recommend downloading the newest version of Flash here, but we support all versions 10 and above.
If that doesn't help, please let us know.
从全血和巴菲皮脂中分离出人类嗜中性粒细胞
Chapters
Summary September 17th, 2021
Please note that all translations are automatically generated.
Click here for the English version.
该协议详细介绍了从全血,黄褐色涂层或白细胞分离膜中性粒细胞的方法,从而实现良好的产量,高纯度和最小的细胞活化。我们利用梯度纯化,红细胞(RBC)沉降和红细胞裂解来获得高质量/纯度的中性粒细胞制剂。
Transcript
中性粒细胞是终末分化的细胞,目前还没有细胞系来完全概括中性粒细胞生物学。因此,有必要获得纯净,灭活,健康和新鲜的嗜中性粒细胞来研究它们的生物学。这种刷新方法结合了密度梯度,沉淀,温和裂解,以获得纯中性粒细胞制剂。
它易于设置,需要简单的设备和很少的练习。这种方法的技术方面,例如渐变分层,将需要一些练习来掌握,但是一旦梯度完善,其他步骤应该变得轻而易举。首先对抛光外套、包装和层流罩进行灭菌。
然后将10毫升血液加入50毫升管中。为了稀释血液以获得更清洁的梯度,添加5%FBS / HBSS,并化妆体积高达35毫升。合上盖子后,将管倒置几次进行混合,然后将管倒置以获得底部没有红细胞。
在血液正下方加入10毫升密度梯度培养基,确保培养基和血液不混合,界面保持锋利。在室温下以400倍g旋转管子30分钟,确保禁用制动器。纺丝后,观察梯度分离成顶部血清血浆层,外周血单核细胞的中间白色环,浑浊密度梯度培养基层,以及由红细胞顶部的白色薄嗜中性粒细胞带组成的底部沉淀。
要去除PBMC,将吸液器直接放入PBMC层并完全吸出,而血清血浆层随着环的去除而减少。用吸液器刮擦管的侧面,以最大限度地去除PBMC。小心地去除PBMC环和嗜中性粒细胞/红细胞沉淀之间的混浊密度梯度培养基层。
对于红细胞沉降,使用10毫升移液管将中性粒细胞/红细胞沉淀转移到干净的管中。然后将5%FBS / HBSS加入到25毫升的最终体积中。直接将含有3%葡聚糖/ 0.9%NaCl的25毫升预热溶液加入管中,并通过倒置轻轻混合。
将管子放在水平和非振动表面上15分钟。将管子放回抽油烟机后,将移液器稍微浸入液体中,并沿着液体表面向下收集约30毫升的顶层。旋转管以获得红色颗粒,在介质中没有漂浮颗粒。
为了裂解残留的红细胞,轻轻吸出上清液而不破坏沉淀。将25毫米无菌超纯水直接加入管中,并通过倒置管28秒轻轻混合以裂解红细胞。然后,立即将25毫升在水中制备的无菌1.8%NaCl溶液加入管中,并通过温和混合将溶液带回等渗条件。
用低制动以200倍g旋转管子三到五分钟,以尽量减少红细胞和血小板与嗜中性粒细胞的沉淀。为了重悬白色中性粒细胞沉淀,直接将培养基加入沉淀上,但不要上下移液。接下来,从一侧到另一侧水平摇动管以最小化细胞活化。
如果观察到细胞聚集或聚集,则通过70微米的网格过滤细胞悬浮液以丢弃聚集的嗜中性粒细胞。为了评估分离的中性粒细胞制剂的质量,用中性粒细胞,嗜酸性粒细胞和活化标记物特异性标记物染色细胞。通过流式细胞术获取20, 000个细胞后,使用门控策略分析细胞纯度和活化,并使用膜联蛋白V/碘化丙啶确定细胞活力,如文本手稿中所述。
低速的密度梯度产生纯度的中性粒细胞,而高速导致以牺牲纯度为代价的产量增加。使用荧光激活的细胞分选,单独提供细胞分布的细胞分离质量估计,但应首选使用特定的细胞标记物。鉴定出的污染细胞群是单核细胞,淋巴细胞和嗜酸性粒细胞。
使用该协议实现了巨大的中性粒细胞产量。评估CD62L的表达。阳性对照细胞中CD62L的平均荧光强度降低,表明CD62L脱落和中性粒细胞活化。
在进行测定之前,应评估中性粒细胞的健康状况,因为嗜中性粒细胞的半衰期相对较短,激活会进一步缩短寿命。使用密度梯度和商业微珠纯化中性粒细胞后,培养细胞24小时,并通过流式细胞术分析细胞存活率。活细胞的定量表明,密度梯度纯化在24小时后比使用试剂盒纯化产生更多的活细胞。
尽可能好地进行梯度分层和离心步骤非常重要,因为它将极大地影响制备质量。体外实验和生化测定可以在该过程后进行。此外,如果需要超纯细胞,则可以进行阴性选择,如在细胞因子和蛋白质表达实验中。
Related Videos
You might already have access to this content!
Please enter your Institution or Company email below to check.
has access to
Please create a free JoVE account to get access
Login to access JoVE
Please login to your JoVE account to get access
We use/store this info to ensure you have proper access and that your account is secure. We may use this info to send you notifications about your account, your institutional access, and/or other related products. To learn more about our GDPR policies click here.
If you want more info regarding data storage, please contact gdpr@jove.com.
Please enter your email address so we may send you a link to reset your password.
We use/store this info to ensure you have proper access and that your account is secure. We may use this info to send you notifications about your account, your institutional access, and/or other related products. To learn more about our GDPR policies click here.
If you want more info regarding data storage, please contact gdpr@jove.com.
Your JoVE Unlimited Free Trial
Fill the form to request your free trial.
We use/store this info to ensure you have proper access and that your account is secure. We may use this info to send you notifications about your account, your institutional access, and/or other related products. To learn more about our GDPR policies click here.
If you want more info regarding data storage, please contact gdpr@jove.com.
Thank You!
A JoVE representative will be in touch with you shortly.
Thank You!
You have already requested a trial and a JoVE representative will be in touch with you shortly. If you need immediate assistance, please email us at subscriptions@jove.com.
Thank You!
Please enjoy a free 2-hour trial. In order to begin, please login.
Thank You!
You have unlocked a 2-hour free trial now. All JoVE videos and articles can be accessed for free.
To get started, a verification email has been sent to email@institution.com. Please follow the link in the email to activate your free trial account. If you do not see the message in your inbox, please check your "Spam" folder.