John Elliot (2010) CIL:7864, Mus musculus, permanent cell line cell. CIL. Dataset

This is part of a triplicate data set of non-overlapping fields of NIH 3T3 fibroblasts cultured on polystyrene. Each set is indicated by the well number. Each image contains 4 images of each field as a time series. The first image is the phase contrast image. The second image channel is Tenascin-C promoter driven destabilized EGFP reporter vector. The third image is Texas Red C2-maleimide (to stain cell body), and the fourth image is Dapi (to stain nuclei).

Images were collected on a Zeiss Axiovert 100. The samples were viewed with a Zeiss A-plan 10x Ph1 0.25 NA objective and recorded with a CoolSnapFX camera using 2 x 2 binning. The filters were as follows: 1.) A custom dichroic multipass beam splitter optimized for imaging DAPI, EGFP and TxRed (part# BS51019+400dclp, Chroma Technology, VT); 2.) DAPI excitation filter-360/40 nm; 3.) DAPI emission filter-460/50 nm; 4.) EGFP excitation filter-470/40 nm; 5.) EGFP emission filter-525/50 nm; 6.) TxRed excitation filter-568/24 nm; 7.) TxRed emission filter-630/60 nm. Autofocus on the TxRed color channel was performed at each location before the series of images were collected.

Protocol: The cells were seeded on TCPS dishes at ~1000 cells/well during a passage cycle. The test cultures were incubated overnight before being rinsed with PBS and then fixed with 300 uM m-maleimidobenzoyl-N-hydroxysuccinimidyl ester (MBS) in microtubule stabilizing buffer (MTSB) composed of 4% (w/v) polyethylene glycol (PEG) 8000, 100 mM 1,4-piperazinediethanesulfonic acid (PIPES),10 mM ethylene glycol-bis(2-aminoethylether)-N,N,N’,N’-tetraacetic acid (EGTA), pH 6.9 for at least 16h at RT. The fixative was removed and solution of 0.05% Triton X100 in PBS containing 10 ng/mL of Tx Red C2-maleimide and 2 ng/mL DAPI for 2h. The staining solution was removed, cells were rinsed with PBS/3% BSA, and 0.05% sodium azide and PBS. A 50% glycerol/10 mM Tris, pH 8.0 containing 2ng/mL DAPI and 0.9g/l 1,4-diazobicyclo[2,2,2]octane (DABCO) as an antifade reagent was then added to each well for imaging purposes. The bottom of the wells were wiped with 70% ethanol wipe and then a dry wipe before imaging.

Purpose: The purpose of the dataset was to measure the distribution of EGFP fluorescence intensities within individual cells in the population. Using the image sets collected, a plugin for ImageJ was used to perform the following image analysis tasks. 1.) The Txred images (which is a general purpose cell body stain) were segmented by manual thresholding. 2.) The resulting mask was used to define cell ROIs on the DAPI and EGFP images. 3.) The number of nuclei in each ROI is determined from the DAPI image and the integrated intensity of the EGFP signal in the cell is determined from ROI in the EGFP image. 4.) A local background intensity around each cell in the EGFP image is determined by dilating the ROI by 3 pixels and determining the pixel intensities in only the 3 pixel dilation area. When this data is placed in a spread sheet, you can use the results to identify cell clusters (i.e. have more than 1 nuclei), debris or partial cell (i.e. no nuclei), poor EGFP/cell measurements (i.e. high background intensity). The spreadsheet can be used to measure the distribution of EGFP cell intensities within a population of cells. The phase images were collected as quality control and validation data. The phase images provide a human validation mechanism if there are questions about the staining and/or fluorescence detection in an image.

References: 1. Langenbach, K.J., Elliott, J.T., Tona, A., and Plant, A.L. (2006) Evaluating the correlation between fibroblast morphology and promoter activity on thin films of extracellular matrix proteins. BMC-Biotechnology 6(1):14. 2.Elliott, J.T., Halter, M., Woodward, J.T., Langenbach, K.J., Tona, A., Plant, A.L. (2008) Evaluating the performance of fibrillar collagen films formed at polystyrene surfaces as cell culture substrates. Biointerphases. 3(2):19-28.

本数据集为非重叠域的 NIH 3T3 纤维母细胞在聚苯乙烯上培养的重复数据集之一。每个数据集以孔号进行标识。每个图像包含每个域的 4 张图像，形成时间序列。第一张图像为相位对比图像。第二张图像通道为受 Tenascin-C 启动子驱动的去稳定化 EGFP 报告基因载体。第三张图像为 Texas Red C2-马来酰亚胺（用于染色细胞体），第四张图像为 Dapi（用于染色细胞核）。图像收集于蔡司 Axiovert 100 显微镜上。样本通过蔡司 A-plan 10x Ph1 0.25 NA 物镜进行观察，并使用 CoolSnapFX 摄像头在 2 x 2 合并模式下进行记录。滤光片配置如下：1）用于成像 DAPI、EGFP 和 TxRed 的定制二向色倍频光束分离器（部件号 BS51019+400dclp，Chroma Technology，VT）；2）DAPI 激发滤光片-360/40 nm；3）DAPI 发射滤光片-460/50 nm；4）EGFP 激发滤光片-470/40 nm；5）EGFP 发射滤光片-525/50 nm；6）TxRed 激发滤光片-568/24 nm；7）TxRed 发射滤光片-630/60 nm。在收集图像序列之前，在每个位置上对 TxRed 颜色通道执行自动对焦。

实验方案：细胞在传代周期中以约 1000 个细胞/孔的密度接种于 TCPS 平底皿中。测试培养物在用 PBS 漂洗后过夜孵育，然后用微管稳定缓冲液（MTSB）中 300 uM m-马来酰亚胺苯甲酰-N-羟基琥珀酰亚胺酯（MBS）固定，MTSB 由 4% （w/v）聚乙二醇 8000、100 mM 1,4-哌嗪二乙烷磺酸（PIPES）、10 mM 乙二醇双（2-氨基乙基）乙二醇四乙酸（EGTA），pH 6.9 组成，在室温下至少固定 16 小时。移除固定剂，用含有 10 ng/mL Tx Red C2-马来酰亚胺和 2 ng/mL Dapi 的 PBS 中 0.05% 的 Triton X100 溶液固定 2 小时。移除染色溶液，细胞用 PBS/3% BSA 和 0.05% 碘化钠及 PBS 漂洗。然后向每个孔中加入含有 2 ng/mL Dapi 和 0.9g/l 1,4-二氮杂双环[2,2,2]辛烷（DABCO）作为抗褪色剂的 50% 甘油/10 mM Tris，pH 8.0 溶液，用于成像。在成像之前，用 70% 乙醇擦拭孔底，然后进行干擦拭。

目的：该数据集旨在测量单个细胞群体中 EGFP 荧光强度的分布。利用收集到的图像集，使用 ImageJ 插件执行以下图像分析任务：1）通过手动阈值分割 Txred 图像（这是一般用途的细胞体染色）；2）使用得到的掩模在 DAPI 和 EGFP 图像上定义细胞区域；3）通过 DAPI 图像确定每个区域中的核数量，并通过 EGFP 图像中的区域确定细胞中 EGFP 信号的积分强度；4）通过将 ROI 扩散 3 像素并确定仅在 3 像素扩散区域内的像素强度来确定每个 EGFP 图像中每个细胞周围的局部背景强度。将此数据放入电子表格中，可以使用结果来识别细胞簇（即具有超过 1 个核的细胞）、碎片或部分细胞（即无核细胞）、EGFP/细胞测量不良（即高背景强度）。电子表格可用于测量细胞群体中 EGFP 细胞强度的分布。相位图像作为质量控制和验证数据收集。相位图像提供了一种人工验证机制，以解决图像中染色和/或荧光检测方面的问题。

参考文献：1. Langenbach, K.J.，Elliott, J.T.，Tona, A.，Plant, A.L. (2006) 评估成纤维细胞形态与细胞外基质蛋白薄膜上启动子活性的相关性。BMC-Biotechnology 6(1):14。2. Elliott, J.T.，Halter, M.，Woodward, J.T.，Langenbach, K.J.，Tona, A.，Plant, A.L. (2008) 评估在聚苯乙烯表面形成的纤维状胶原蛋白薄膜作为细胞培养基质的性能。Biointerphases. 3(2):19-28。