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ClonaCell™-CHO CD培养基

化学定义，无动物成分，无血清，无蛋白质，无谷氨酰胺半固体甲基纤维素为基础的培养基，用于选择和克隆CHO细胞
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产品号 #（选择产品）

产品号 #03815_C

化学定义，无动物成分，无血清，无蛋白质，无谷氨酰胺半固体甲基纤维素为基础的培养基，用于选择和克隆CHO细胞

产品优势

  • 使单细胞克隆和CHO细胞在化学定义，无蛋白，无动物成分的培养基中扩增
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概述

ClonaCell™-CHO CD Medium是一种基于甲基纤维素的半固体培养基，推荐用于中国仓鼠卵巢（CHO）细胞的选择和克隆。该培养基是化学定义的，不含蛋白质，不含动物成分。它不含l -谷氨酰胺、选择剂或酚红，与二氢叶酸还原酶（DHFR）和谷氨酰胺合成酶（GS）选择系统兼容。

半固态克隆的好处：
•单个克隆及其后代在半固体基质中保持定位，因为它们生长形成不同的单克隆菌落。这可以防止在液体培养基中选择过程中，由于快速生长的细胞过度生长而导致稀有高产克隆的损失，并有助于分离出具有广泛生长速率和生产力范围的多种克隆，以供下游筛选。
•从半固体培养基中获得的菌落具有很高的单克隆可能性，与有限稀释克隆相比，可以在更短的时间内使用更少的资源生成克隆细胞系。
•菌落可以通过人工或机器人方法轻松地从半固体培养基中挑选出来，并分散到液体培养基中进行筛选和扩增。

Contains
• Methylcellulose
• Kolliphor® P188
• Other ingredients
 
Subtype
Semi-Solid Media, Specialized Media
 
Cell Type
CHO Cells
 
Species
Other
 
Application
Cell Culture, Semi-Solid Cloning
 
Brand
ClonaCell
 
Area of Interest
Antibody Development, Cell Line Development, Drug Discovery and Toxicity Testing
 
Formulation Category
Animal Component-Free, Chemically Defined, Protein-Free, Serum-Free
 

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Protocols and Documentation

Find supporting information and directions for use in the Product Information Sheet or explore additional protocols below.

Document Type
Product Name
Catalog #
Lot #
Language
Document Type
Product Information Sheet
Product Name
ClonaCell™-CHO CD Medium
Catalog #
03815
Lot #
All
Language
English
Document Type
Safety Data Sheet
Product Name
ClonaCell™-CHO CD Medium
Catalog #
03815
Lot #
All
Language
English

Applications

This product is designed for use in the following research area(s) as part of the highlighted workflow stage(s). Explore these workflows to learn more about the other products we offer to support each research area.

Research Area
Workflow Stages

Resources and Publications

Educational Materials (7)

ClonaCell-CHO Semi-Solid Cloning Testing Guidelines
Brochure
ClonaCell-CHO Semi-Solid Cloning Testing Guidelines
Increase the Efficiency of Your Hybridoma Workflow with EasySep™ and ClonaCell™
Brochure
Increase the Efficiency of Your Hybridoma Workflow with EasySep™ and ClonaCell™
ClonaCell™ Media for Hybridoma and Cell Line Development
Brochure
ClonaCell™ Media for Hybridoma and Cell Line Development
Protocol for Cloning CHO Cell Lines Using ClonaCell™-CHO Semi-Solid Medium
Technical Bulletin
Protocol for Cloning CHO Cell Lines Using ClonaCell™-CHO Semi-Solid Medium
Why Use Semi-Solid Medium for Cloning Hybridomas and CHO Cells
3:39
Video
Why Use Semi-Solid Medium for Cloning Hybridomas and CHO Cells
How to Perform Semi-Solid Cloning of CHO Cell Lines in 96-Well Plates Using ClonaCell™-CHO Medium
12:47
Video
How to Perform Semi-Solid Cloning of CHO Cell Lines in 96-Well Plates Using ClonaCell™-CHO Medium
Semi-Solid Cloning of CHO Cells Using ClonaCell™-CHO Medium
10:50
Video
Semi-Solid Cloning of CHO Cells Using ClonaCell™-CHO Medium

Frequently Asked Questions

Why do I get more cells when I select my fusion in liquid medium rather than in methylcellulose-based semi-solid medium?

Cells grown in liquid medium may appear to grow more rapidly than in methylcellulose-based medium. This is often due to the presence of a few rapidly growing clones that multiply quickly and become abundant in liquid culture, overgrowing clones that grow more slowly. In methylcellulose cultures, the rapidly growing cells remain in close proximity to each other, resulting in large colonies, each derived from a single fusion or transfection product. The large clones don't overgrow smaller, slower growing colonies, which can be separately isolated.

How do I thaw ClonaCell™ methylcellulose-based semi-solid medium?

We recommend thawing the medium overnight in a refrigerator at 4°C and mixing well.

How do I measure and dispense methylcellulose semi-solid medium?

We recommend using a 12 mL syringe with a 16 gauge needle attached (blunt end needles are recommended for safety purposes). Do not dispense the semi-solid media/cell mixture using serological pipettes as the media will stick to the pipette walls, resulting in inaccurate dispensed volumes and loss of cells.

My ClonaCell™ methylcellulose semi-solid medium appears runny. Why does this happen?

"Runny" methylcellulose could be a result of improper handling. Diluting the methylcellulose with too much liquid medium, or insufficient mixing before use, will result in methylcellulose with altered viscosity. Excessive condensation on the inside of the cell culture dish lid can result in water dripping onto the cultures, lowering viscosity. Additionally, bumping, shaking or other sudden movement of the culture may also disrupt the colonies. Note: methylcellulose is less viscous at room temperature than at 37°C.

What is the optimal number of colonies per plate?

We recommend 50-150 colonies per plate. As it is difficult to anticipate the numbers of colonies after a fusion or transfection, we recommend plating at three different densities to increase the likelihood of achieving a plating density of approximately 100 colonies per plate. This density allows sufficient space between the colonies to allow for easy colony picking.

There are still bubbles in the media after I plate my cells. Do I need to disrupt the bubbles?

We recommend that you avoid creating large bubbles during plating, but there is no need to manually pop or disperse the small bubbles after plating. They will disperse over the incubation period of 10-14 days.

Do I ever need to re-clone cultures grown with ClonaCell™ semi-solid medium?

Re-cloning is a good practice to observe and is recommended if the number of colonies in the original dishes was very high.

Once I pick the colonies and grow the cells in plates, will the residual methylcellulose interfere with characterization? For example, will I have problems doing an ELISA?

There will likely be some residual methylcellulose contamination when colonies are picked and transferred to the 96-well plate with the liquid growth medium. The concentration of methylcellulose, however, should be low enough that it should not interfere with most assays.

How important is the incubator humidity when culturing in methylcellulose-based medium?

Very important. In situations where the humidity is not high enough, we recommend that the 100 mm Petri dishes should be placed with an open dish containing sterile water inside a larger plastic container with a lid. Without very high humidity, the media will dry out over the culture period and this will impede the growth of the colonies.

Do I have to use 100 mm petri dishes or can I use other cultureware?

We recommend 100 mm Petri dishes as these have been used to develop and test ClonaCell™ semi-solid media. We have found that the surface area of these dishes allows for easy colony picking. Other sizes of dish (e.g. 6-well plates) can be used. It is important to use non-coated dishes to prevent cells from sticking to the bottom of the plate and obscuring the colonies. The volume of media plated should be adjusted to reflect the surface area of the dish being used.

Are there any selective agents in ClonaCell™-CHO ACF or ClonaCell™-CHO CD?

These media do not contain hypoxanthine, aminopterin, thymidine, glutamine, or any other selective agents or antibiotics. These media are therefore fully customizable. Both ClonaCell™-CHO ACF and ClonaCell™-CHO CD are compatible with dihydrofolate reductase (DHFR) and glutamine synthetase (GS) selection.

My cells grow fine in ClonaCell™-CHO ACF but I do not see colony growth in ClonaCell™-CHO CD. Why?

The plating density for successful colony growth in protein-free medium needs to be higher than what is recommended for medium that contains protein. The optimal plating density should be determined empirically by plating several cell densities. For example, when re-cloning established cell lines, we recommend testing 200-1000 cells per 100 mm plate for ClonaCell™-CHO ACF and testing 2000-10000 cells per 100mm dish for ClonaCell™-CHO CD.

What medium do you recommend for the expansion of clones after selection in ClonaCell™-CHO ACF or ClonaCell™-CHO CD?

CHO cells selected in either ClonaCell™-CHO ACF or ClonaCell™-CHO CD semi-solid medium can be expanded in ClonaCell™-CHO CD Liquid medium.

How many cells should I plate for cloning in ClonaCell™-CHO CD?

Cloning efficiencies vary for different clones and cell lines. For optimal cloning efficiencies, cells should be in logarithmic phase prior to plating. If you have had previous experience with cloning in a chemically defined liquid medium, plating cell concentration that would result in ~100 clones may be used to plate in semi-solid medium (e.g. If plating at 1 cell/well in a 96-well plate results in 10 wells being positive for clones, plating 1000 cells per 100mm plate in semi-solid medium would be a good starting cell concentration to test). A minimum of three plating cell concentrations is recommended. If no work has been previously done with the specific cell line, we recommend a range of 25 000 - 100,000 cells per 100 mm dish for selection and cloning after transfection, and 2000 - 10,000 cells per 100 mm dish for subcloning. Additional optimization of cell concentrations may be necessary.

Is the serum in ClonaCell™-TCS medium heat inactivated?

Yes, all serum used in ClonaCell™ is heat inactivated.

Is there any IgG in ClonaCell™ TCS?

While we don't add IgG to the ClonaCell™ media, we do add serum, which contains an undefined amount of IgG. We selectively use serum lots with low IgG levels in the production of ClonaCell™ media, however, levels vary from lot to lot. IgG levels in a specific lot of ClonaCell™ TCS medium are available in the lot-specific Certificate of Analysis.

Can ClonaCell™-TCS be used with any cell line?

A list of recommended cell lines can be found in the manual. Other cell lines may be compatible with ClonaCell™-TCS. It will be necessary, however, to determine the plating cell density and growth efficiency of the desired cells in ClonaCell™-TCS.

Publications (1)

Cell senescence as both a dynamic and a static phenotype Young ARJ et al. 2013

Abstract

It has been 50 years since cellular senescence was first described in human diploid fibroblasts (HDFs), yet its mechanism as well as its physiological and clinical implications are still not fully appreciated. Recent progress suggests that cellular senescence is a collective phenotype, composed of complex networks of effector programs. The balance and quality within the effector network varies depending on the cell type, the nature of the stress as well as the context. Therefore, understanding each of these effectors in the context of the whole network will be necessary in order to fully understand senescence as a whole. Furthermore, searching for new effector programs of senescence will help to define this heterogeneous and complex phenotype according to cellular contexts.
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Species Other
Contains • Methylcellulose • Kolliphor® P188 • Other ingredients
Formulation Category Animal Component-Free, Chemically Defined, Protein-Free, Serum-Free
Legal Statement: Kolliphor® is a registered trademark of BASF. PRODUCTS ARE FOR RESEARCH USE ONLY AND NOT INTENDED FOR HUMAN OR ANIMAL DIAGNOSTIC OR THERAPEUTIC USES UNLESS OTHERWISE STATED. FOR ADDITIONAL INFORMATION ON QUALITY AT STEMCELL, REFER TO WWW.STEMCELL.COM/COMPLIANCE.
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