<meta charset="utf8"></head><body>通过基于图像的 ML 策略监测多能干细胞分化

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>0.25% Trypsin-EDTA</td>
			<td>Gibco</td>
			<td>25200056</td>
			<td>Diluted digests were used for CPC and CM digestion</td>
		</tr>
		<tr>
			<td>4% Paraformaldehyde in PBS</td>
			<td>KeyGEN BioTECH</td>
			<td>KGIHC016</td>
			<td></td>
		</tr>
		<tr>
			<td>6-well Cell Culture Plate</td>
			<td>NEST</td>
			<td>703001</td>
			<td></td>
		</tr>
		<tr>
			<td>96-well Cell Culture Plate</td>
			<td>NEST</td>
			<td>701001</td>
			<td></td>
		</tr>
		<tr>
			<td>B27 Supplement</td>
			<td>Gibco</td>
			<td>17504044</td>
			<td></td>
		</tr>
		<tr>
			<td>B27 Supplement Minus Insulin</td>
			<td>Gibco</td>
			<td>A1895601</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine serum albumin (BSA)</td>
			<td>GPC BIOTECH</td>
			<td>AA904-100G</td>
			<td></td>
		</tr>
		<tr>
			<td>Celldiscoverer 7</td>
			<td>Zeiss</td>
			<td></td>
			<td>Instruments used to take bright-field images throughout differentiation and final cTnT images</td>
		</tr>
		<tr>
			<td>CHIR99021</td>
			<td>Selleck</td>
			<td>S1263</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM/F12</td>
			<td>Gibco</td>
			<td>12634010</td>
			<td></td>
		</tr>
		<tr>
			<td>Donkey anti-Mouse IgG (H+L) Highly Cross-Adsorbed Secondary Antibody, Alexa Fluor 488</td>
			<td>Thermo</td>
			<td>A-21202</td>
			<td>Secondary Antibody</td>
		</tr>
		<tr>
			<td>FACSAria III</td>
			<td>BD Biosciences</td>
			<td></td>
			<td>Flow cytometry sorter</td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum (FBS)</td>
			<td>VISTECH</td>
			<td>SE100-B</td>
			<td></td>
		</tr>
		<tr>
			<td>Hoechst 33342</td>
			<td>YEASEN</td>
			<td>40732ES03</td>
			<td></td>
		</tr>
		<tr>
			<td>Human Pluripotent Stem Cell Chemical-defined Medium</td>
			<td>Cauliscell Inc</td>
			<td>400105</td>
			<td>Basal medium of PSC preparation medium</td>
		</tr>
		<tr>
			<td>iPS-18</td>
			<td>TaKaRa</td>
			<td>Y00300</td>
			<td></td>
		</tr>
		<tr>
			<td>iPS-B1</td>
			<td>Cellapy</td>
			<td>CA4025106</td>
			<td></td>
		</tr>
		<tr>
			<td>iPS-F</td>
			<td>Nuwacell</td>
			<td>RC01001-B</td>
			<td></td>
		</tr>
		<tr>
			<td>iPS-M</td>
			<td>Nuwacell</td>
			<td>RC01001-A</td>
			<td></td>
		</tr>
		<tr>
			<td>IWR1-1-endo</td>
			<td>Selleck</td>
			<td>S7086</td>
			<td>IWR1</td>
		</tr>
		<tr>
			<td>Jupyter Notebook</td>
			<td>N/A</td>
			<td>Version 6.4.0</td>
			<td><a href="https://jupyter.org/">https://jupyter.org/</a></td>
		</tr>
		<tr>
			<td>MATLAB</td>
			<td>MathWorks</td>
			<td>Version R2020a</td>
			<td>Software for scientific computation and image annotation</td>
		</tr>
		<tr>
			<td>Matrigel Matrix</td>
			<td>Corning</td>
			<td>354230</td>
			<td>Matrigel</td>
		</tr>
		<tr>
			<td>Mouse monoclonal IgG1 anti-cTnT</td>
			<td>Thermo</td>
			<td>MA5-12960</td>
			<td>cTnT primary antibody</td>
		</tr>
		<tr>
			<td>Normal Donkey Serum</td>
			<td>Jackson</td>
			<td>017-000-121</td>
			<td></td>
		</tr>
		<tr>
			<td>ORCA-Flash 4.0 V3 digital CMOS camera</td>
			<td>Hamamatsu</td>
			<td>C13440-20CU</td>
			<td>The digital camera assembled on Celldiscoverer7</td>
		</tr>
		<tr>
			<td>PBS</td>
			<td>NEB</td>
			<td>21-040-CVR</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin</td>
			<td>Gibco</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>Pluripotency Growth Mater 1 basal medium</td>
			<td>Cellapy</td>
			<td>CA1007500-1</td>
			<td>Basal medium of PSC culture medium</td>
		</tr>
		<tr>
			<td>Pluripotency Growth Mater 1 supplement</td>
			<td>Cellapy</td>
			<td>CA1007500-2</td>
			<td>Supplement of PSC culture medium</td>
		</tr>
		<tr>
			<td>Prism</td>
			<td>Graphpad</td>
			<td>Version 8/9</td>
			<td>Statistical software for statistical analysis and plotting</td>
		</tr>
		<tr>
			<td>Python</td>
			<td>N/A</td>
			<td>version 3.6</td>
			<td>Python 3 environment for scientific computation, with packages pytorch (1.9.0), numpy, scipy, pandas, visdom, scikit-learn, scikit-image, opencv-python, and matplotlib software for scientific computation and image annotation.</td>
		</tr>
		<tr>
			<td>RPMI 1640</td>
			<td>Gibco</td>
			<td>11875176</td>
			<td></td>
		</tr>
		<tr>
			<td>Supplement hPSC-CDM (500x)</td>
			<td>Cauliscell Inc</td>
			<td>00015</td>
			<td>Supplement of PSC preparation medium</td>
		</tr>
		<tr>
			<td>TiE</td>
			<td>Nikon</td>
			<td></td>
			<td>An inverted fluorescence microscope (with modification) for region-selevtive purification</td>
		</tr>
		<tr>
			<td>Triton&#160;X-100</td>
			<td>Amresco</td>
			<td>9002-93-1</td>
			<td></td>
		</tr>
		<tr>
			<td>Versene Solution</td>
			<td>Thermo</td>
			<td>15040066</td>
			<td>EDTA solution for PSC digestion</td>
		</tr>
		<tr>
			<td>Y27632</td>
			<td>Selleck</td>
			<td>S6390</td>
			<td></td>
		</tr>
		<tr>
			<td>Zen</td>
			<td>Zeiss</td>
			<td>Version 3.1</td>
			<td>A supporting software of Celldiscoverer7 for&#160; image acquisition, processing and analysis</td>
		</tr>
	</tbody>
</table>

a live-cell image-based machine learning strategy to monitor pluripotent stem cell differentiation

Pluripotent stem cells (PSCs) possess the remarkable ability to differentiate into many types of cells in vitro. These differentiated functional cells could be used for cell therapy, disease modeling, and drug development, all valuable for research or clinical applications1,2,3. For example, a variety of methods have been developed to differentiate PSCs into cardiomyocytes (CMs)4,5,6,7. These CMs can be applied for cardiotoxicity testing of drugs, modeling of heart disease, and cell transplantation8,9,10,11.
However, the conversion from PSC to the terminal differentiated cells is a stepwise process, and multiple perturbations during the differentiation process may lead cells to divergent cell fates. Different genetic backgrounds and epigenetic marks of PSC lines influence the potential for differentiation to a specific lineage12,13,14,15; the number of PSC passages and accumulated gene mutations are also sources of PSC heterogeneity; differences in the experimental operations employed by different experimenters can also lead to completely different differentiation results16,17,18,19,20. Therefore, currently one of the main problems in PSC-derived cell production is the instability among cell lines and batches21,22,23,24,25. Instability in PSC differentiation often leads to multiple repeated experiments, consuming significant time and labor resources. To address this issue, it is crucial to develop a strategy that minimizes the variability among cell lines and batches, thus enhancing the stability and robustness of the differentiation.
Recently, advances in high-resolution microscopy and machine learning (ML) have facilitated the application of ML-based quantitative image analysis in cell biology, making it possible to utilize valuable information in cell imaging features26,27,28,29,30,31,32,33,34. In our previous work, we proposed a live-cell image-based ML strategy to monitor and intervene in the PSC differentiation status in real time to improve the stability and efficiency of the PSC differentiation (Figure 1)35. Taking PSC-to-cardiomyocyte differentiation as an example, we evaluated the initial PSC state using random forest models, predicted the optimal differentiation condition using logistic regression models, and recognized successfully differentiated cells using deep learning-based Grad-CAM36 and pix2pix37. ML models learned to identify cell lineages from a range of bright-field morphological features, including features about area, circumference, convexity, solidity, brightness, moving velocity, and other implicit features extracted by deep convolutional neural networks. Based on inference from these established ML models, we realized control of the initial PSC state, early assessment and intervention in differentiation conditions, and elimination of the misdifferentiated cell contamination, together providing a comprehensive and accurate modulation of the cardiac differentiation process. Here we provide a step-by-step protocol for developing the strategy.

<meta charset="utf8"></head><body>作者聚焦：使用基于活细胞明场成像的 ML 模型增强 PSC 到功能性细胞的分化

一种基于活细胞图像的机器学习策略，用于监测多能干细胞分化

In this study, based on live-cell bright-field images, we developed a strategy, harnessing different machine learning models. This strategy can identify cell lineage non-invasively, modulate the differentiation process in real-time, and optimize the differentiation protocol, improving the invulnerability in PSC-to-functional cell differentiation. Pluripotent stem cells present the ability to differentiate into many types of cells in vitro, which could be used for cell therapy, disease modeling, and drug development.One of the main problems in PSC-derived cell production, is the instability among cell lines and batches. It often leads to multiple repeated experiments, consuming significant time and labor. Currently, state-of-the-art microscopic technologies could support long-term time-lapse, high-throughput image acquisition on live cells.Meanwhile, the fast evolving machine learning method is being increasingly applied in cellular image analysis, which is opening possibilities to recognize specific cellular constituents or cell images during differentiation in cell culture. This method could hopefully be applied to standardized other cell fate induction systems like organoid differentiation, direct transdifferentiation, or cellular programming, especially for unstable systems requiring multiple steps and complex inducers. Also, our strategy is compatible with other technologies, which promisingly can be integrated into a self-adaptive and closed-loop system for full-automatic processing of PSC differentiation in vitro.

Pluripotent stem cell (PSC) technologies have been widely used in drug discovery, disease modeling, and regenerative medicine.&#160;However, available ...

a-live-cell-image-based-machine-learning-strategy-to-monitor

Research

JoVE Journal

Biology

A Live-cell Image-Based Machine Learning Strategy to Monitor Pluripotent Stem Cell Differentiation

244 次观看.  Peking University. 在这项研究中，基于活细胞明场图像，我们开发了一种策略，利用不同的机器学习模型。该策略可以无创地识别细胞谱系，实时调节分化过程，并优化分化方案，提高 PSC 到功能细胞分化的无敌性。多能干细胞具有在体外分化成多种类型细胞的能力，可用于细胞治疗、疾病建模和药物开发。PSC 衍生细胞生产的主要问题之一是细胞系和批次之间的...