Shop All Cell Growth and Differentiation Reagents and Kits

Product Type

DQ™ Collagen, type IV From Human Placenta, Fluorescein Conjugate Invitrogen™

The fluorogenic DQ™ collagen can be used to directly monitor collagenase activity. DQ™ substrates are analogs of the natural substrate that have an excessive number of fluorescent dyes attached so that the fluorescence signal is almost non-existent. This quenching of the signal is caused by the close proximity of the dyes on the intact substrate. The enzyme-driven hydrolysis of the substrate results in separation of the dye results in separation of the dye molecules from one another and the fluorescence signal increases.

DQ™ Ovalbumin - Special Packaging Invitrogen™

DQ ovalbumin is a fluorogenic substrate for proteases. A strong fluorescence quenching effect is observed when proteins are heavily labeled with BODIPY dyes. Upon hydrolysis of the DQ ovalbumin to single, dye-labeled peptides by proteases, this quenching is relieved, producing brightly fluorescent products.

DQ™ Gelatin From Pig Skin, Fluorescein Conjugate - Special Packaging Invitrogen™

Our DQ gelatin is a fluorogenic substrate that can be used to detect protease activity in vitro with high sensitivity. This substrate, formerly available only in our popular EnzChek Gelatinase/Collagenase Assay Kit (E-12055), consists of highly quenched, fluorescein-labeled gelatin. Upon proteolytic digestion, its bright, green fluorescence is revealed and can be used to measure enzymatic activity. The fluorescence increase can be monitored with a fluorescence microplate reader or fluorometer.

Thapsigargin Invitrogen™

Thapsigargin is a naturally occurring sesquiterpene lactone isolated from the umbelliferous plant Thapsia garganica. This tumor promoter releases Ca2+ from intracellular stores by specifically inhibiting the endoplasmic reticulum Ca2+-ATPase; it does not directly affect plasma membrane Ca2+-ATPases, Ins 1,4,5-P3 production or protein kinase C activity. Thapsigargin is also available in a 1 mg packaging, T7458.

Premo™ Autophagy Sensor LC3B-RFP (BacMam 2.0) Invitrogen™

Premo™ Autophagy Sensor combines the selectivity of a LC3B-red fluorescent protein (RFP) chimera with the transduction efficiency of BacMam technology, enabling unambiguous visualization of this protein. BacMam reagents (insect Baculovirus with a Mammalian promoter) are non-replicating in mammalian cells and thus safe to handle. They are also non-cytotoxic and ready-to-use. Unlike expression vectors, BacMam reagents enable titratable and reproducible expression and offer high co-transduction efficiency, therefore multiple BacMam reagents can readily be used in the same cell. Recent improvements made to the BacMam system enable efficient transduction in a wider variety of cells including neurons and neural stem cells (NSCs) with an easy, one-step protocol. Now, to visualize autophagy, simply add the BacMam LC3B-FP to the cells and incubate overnight for protein expression. Each Premo™ Autophagy Sensor Kit includes the BacMam LC3B-FP, a control BacMam LC3B (G120A)-RFP (mutation on the control BacMam LC3B prevents cleavage and subsequent lipidation during normal autophagy, thus protein localization should remain cytosolic and diffuse) and chloroquine diphosphate to artificially induce autophagosome accumulation.

CyQUANT™ LDH Cytotoxicity Assay Invitrogen™

The CyQUANT LDH Cytotoxicity Assay is a colorimetric assay that provides a simple and reliable method for determining cellular cytotoxicity. Lactate dehydrogenase (LDH) is a cytosolic enzyme present in many different cell types that is released into the cell culture medium upon damage to the plasma membrane. The CyQUANT LDH Cytotoxicity Assay provides the reagents to accurately and quantitatively measure this extracellular LDH.

Note: The CyQUANT LDH Cytotoxicity Assay (Cat. Nos. C20300 and C20301) are direct replacements for the Pierce LDH Cytotoxicity Assay Kit (Cat. Nos. 88953 and 88954).

CyQUANT LDH Cytotoxicity Assay features include:
Convenient—add-mix-read assay format for adherent and suspension cells, including 3D cell models
Accurate—provides a quantitative measurement of LDH release
Flexible—ideal for high-throughput screening, monitor cytotoxicity from the same sample over time
Robust—uses stable LDH enzyme activity as a cytotoxic marker

LDH is a cytosolic enzyme present in many different cell types and is a well-established and reliable indicator of cellular toxicity. Damage of the plasma membrane results in a release of LDH into the surrounding cell culture medium. This extracellular LDH can be quantified by a coupled enzymatic reaction in which LDH catalyzes the conversion of lactate to pyruvate via NAD+ reduction to NADH. Diaphorase then uses NADH to reduce a tetrazolium salt (INT) to a red formazan product that can be measured at 490 nm. The level of formazan formation is directly proportional to the amount of LDH released into the medium.

The CyQUANT LDH Cytotoxicity Assay provides the reagents needed for the simple, reliable colorimetric quantification of cellular cytotoxicity. The kit can be used with different cell types, including 3D cell models, to measure cytotoxicity mediated by chemical compounds as well as cell-mediated cytotoxicity. Since LDH in the medium is the indicator of cellular cytotoxicity, the assay can be used to monitor cytotoxicity from the same sample over time. To perform the assay, an aliquot of the cell culture medium is transferred to a new plate and the reaction mixture is added. After a 30-minute incubation, the reaction is stopped by adding Stop Solution and absorbance is measured using a microplate reader.

Biocytin TMR (5-(and-6)-Tetramethylrhodamine Biocytin) Invitrogen™

The water-soluble neuronal tracer 5-(and-6)-tetramethylrhodamine biocytin (biocytin TMR) can be detected in fixed tissues by using avidin or streptavidin probes. However, tetramethylrhodamine biocytin can also be observed directly in fixed or unfixed samples because the attached tetramethylrhodamine dye produces bright, orange-fluorescence (absorption/emission maxima ~554/581 nm).

Fluo-4 Direct™ Calcium Assay Kit Invitrogen™

The Fluo-4 Direct™ Calcium Assay Kit was formulated to provide a homogeneous fluorescent calcium assay that:
1. Easily loads into cells
2. Achieves a large assay window and
3. Suppresses background fluorescence generated from the calcium indicator in complete media with little-to-no impact on the specific cellular fluorescence

This advanced formulation allows the assay to be run in a simple “addition only" format in the presence of serum-containing media. Fluo-4 Direct™ is the third addition to the Fluo-4 family of calcium detection reagents. Fluo-4 AM and Fluo-4 NW both require media removal before assay detection, but Fluo-4 NW adds convenience by including the PowerLoad™ reagent for ease in cell loading. The Fluo-4 Direct™ Calcium Assay Kit is similar to Fluo-4 NW in that it is formulated with PowerLoad™ for ease in cell loading, but unique in that it can be used in the presence of complete culture media and will efficiently suppress background fluorescence without sacrificing the specific cellular fluorescence generated in the assay.

Fura-2, AM, cell permeant Invitrogen™

Fura-2, AM is a high affinity, intracellular calcium indicator that is ratiometric and UV light—excitable. This acetoxymethyl (AM) ester form is useful for noninvasive intracellular loading and is also available in 1 mg amounts (F-1201) and in a DMSO solution (F-1225). Cell-impermeant pentapotassium (F-1200) and pentasodium (F-6799) salt forms of the dye are available.

DQ™ Collagen, type I From Bovine Skin, Fluorescein Conjugate Invitrogen™

The fluorogenic DQ™ collagen can be used to directly monitor collagenase activity. DQ™ substrates are analogs of the natural substrate that have an excessive number of fluorescent dyes attached so that the fluorescence signal is almost non-existent. This quenching of the signal is caused by the close proximity of the dyes on the intact substrate. The enzyme-driven hydrolysis of the substrate results in separation of the dye results in separation of the dye molecules from one another and the fluorescence signal increases.

LIVE/DEAD™ Fixable Blue Dead Cell Stain Kit, for UV excitation Invitrogen™

The LIVE/DEAD™ Fixable Blue Dead Cell Stain Kit is used to determine the viability of cells prior to the fixation and permeabilization required for intracellular antibody staining or prior to elimination of biohazardous materials using formaldehyde fixation. This kit has been optimized and validated for use with a UV laser flow cytometer.

• Stable—dyes are freeze dried in separate vials to maintain stability

• Robust—staining pattern is the same before and after fixation

• Bright signal—allows for easy distinction between live/dead cells in single channel

View a selection guide for all fixable viability dyes for flow cytometry.

Unlike products that are sold in solution, the LIVE/DEAD™ Fixable Blue Stain has been conveniently packaged in 40-test vials to help ensure the stability and performance of the dye over time. Amine reactive dyes in solution will lose their effectiveness over a short period of time, therefore it is recommended to completely use the vial once rehydrated. If this is not possible, aliquot the vials in small volumes and store at -80°C, avoiding freeze-thaw cycles.

Dead cell discriminator stains can lose sensitivity after treatment with fixatives such as formaldehyde or ethanol-based fixation methods required for intracellular phosphorylation studies. The LIVE/DEAD™ Fixable Blue Stain is an amine reactive dye that binds covalently to intracellular and extracellular amines, and the staining pattern is preserved following formaldehyde fixation.

Optimal brightness
The LIVE/DEAD™ Fixable Blue Stain was selected based on its fluorescent properties to provide a bright signal when excited with a UV laser. The blue-fluorescent reactive dye has an excitation maximum of ~350 nm, making it ideal for use with an UV laser, and an emission of ~450 nm. By switching viability staining from a channel off of the blue 488 nm laser to the UV laser, you will free up a channel on your flow cytometer for other reagents that are difficult to find in colors other than FITC or PE. By using the UV laser, there is no spectral overlap issues with other common dyes, thus eliminating the need to compensate the viability stains from other stains in your panel. Since live and dead cells can be discriminated using a single dye and a single channel of a flow cytometer, it is an ideal choice for multi-color experiments.

How it works
In cells with compromised membranes, the dye reacts with free amines both in the cell interior and on the cell surface, yielding intense fluorescent staining. In viable cells, the dye's reactivity is restricted to the cell-surface amines, resulting in less intense fluorescence. The difference in intensity is typically greater than 50-fold between live and dead cells, allowing for easy discrimination.

Colors available
LIVE/DEAD™ Fixable Dead Cell Stains are available in a wide variety of colors to meet your multi-color panel needs.

StemPro™ Adipogenesis Differentiation Kit Gibco™

For Complete Differentiation of Human Mesenchymal Stem Cells into Fat Cells

StemPro® Adipogenesis Differentiation Kit has been developed for the adipogenic differentiation of mesenchymal stem cells (MSCs) in tissue culture vessels. The kit contains all reagents required for inducing MSCs to be committed to the adipogenesis pathway and generate adipocytes. Using StemPro® Adipogenesis Differentiation Kit in combination with StemPro® MSC SFM or MesenPRO RS™ Medium provides a standardized culture workflow solution for MSC isolation, expansion and differentiation into lipid vesicle-forming adipocytes.

Fluorescein Diphosphate, Tetraammonium Salt (FDP) Invitrogen™

FDP is a colorless and nonfluorescent substrate for alkaline phosphatases. Sequential alkaline phosphatase mediated hydrolysis of its two phosphate substituents yields weakly fluorescent fluorescein monophosphate followed by strongly fluorescent fluorescein (excitation/emission ~490/514 nm).

Premo™ FUCCI Cell Cycle Sensor (BacMam 2.0) Invitrogen™

Premo™ FUCCI Cell Cycle Sensor is a fluorescent, two-color sensor of cell cycle progression and division in live cells. It allows accurate and sensitive cell cycle analysis of individual cells or a population of cells by fluorescence microscopy, flow cytometry, or high-content imaging.

At 2 x 200 µL, this is a smaller pack size version (1/5 volume) of the popular full-size product and perfect for testing its performance in your system.

The Premo™ FUCCI Cell Cycle Sensor is delivered by highly efficient BacMam 2.0 technology, enabling cell cycle studies in essentially any cell type. Provided in a ready-to-use format—simply add, incubate, and image. Premo™ FUCCI affords highly efficient transient expression in cell lines, primary cells, and stem cells.

Premo™ FUCCI Cell Cycle Sensor is:

Accurate: Cell-cycle controlled expression of bright GFP and RFP indicators for live cell analysis of individual cells or populations
Highly Efficient: >90% transduction of a wide range of mammalian cell lines, including primary cells, stem cells, and neurons
Fast and Convenient: Simply add Premo™ FUCCI Cell Cycle Sensor to your cells in complete medium, incubate overnight, and analyze
Safe: BacMam reagents are non-integrating and non-replicating in mammalian cells, lack observable cytopathic effects, and are suitable for biosafety level (BSL) 1 handling

Study Cell Cycle in the Relevant Cellular Context
If you are studying cell cycle regulators, cell differentiation, or are developing anti-cancer compounds against cell cycle-related targets, Premo™ FUCCI is a superbly sensitive and accurate sensor tool. The efficient transduction and transient expression allows you to conduct these experiments in the biologically relevant cell types.

Simple, Quick Cell Cycle Visualization
Simply add the ready-to-use Premo™ FUCCI cell cycle sensor to your cells in complete medium, incubate overnight, then visualize cell cycle progression in populations of cells using fluorescence microscopy, flow cytometry, or high content imaging instruments. Cells change from red in the G1 to yellow in the G1/S interphase and green in S, G2, and M phases, as fusions of emGFP and TagRFP coupled to two cell cycle-regulated proteins are expressed and degraded.

How It Works
Premo™ FUCCI is derived from the fluorescence ubiquitination cell cycle indicator (FUCCI), developed by Miyawaki and colleagues (Ref 1). FUCCI is based on two cell cycle-regulated proteins, geminin and Cdt1, fused to one green (emGFP) and red (TagRFP) fluorescent protein, respectively. As Cdt1 and geminin are present only during specific phases of the cell cycle, the fluorescent protein partner is similarly cell-cycle dependent. Ubiquitination by specific ubiquitin E3 ligases target the fusion constructs in the proteasome for degradation. E3 ligases display temporal regulation of activity, resulting in biphasic cycling of geminin and Cdt1 levels during the cell cycle. Geminin-GFP is degraded in the G1 phase; the presence of Cdt1-TagRFP is indicated by red fluorescence within nuclei. During the S, G2, and M phases, however, Cdt1 is degraded and only geminin-GFP remains, giving cells green-fluorescent nuclei. During the G1/S transition, when Cdt1 levels are decreasing and geminin levels are increasing, both proteins are present, giving a yellow-fluorescent nuclear signal. This dynamic color change (red to yellow to green) clearly displays progression through the cell cycle and division.

Powered by BacMam 2.0 Technology
BacMam technology is based on an insect virus (baculovirus) for efficient transduction and transient expression in mammalian cells. The Premo™ FUCCI cell cycle sensor uses BacMam 2.0 technology to enable cell cycle studies in essentially any cell type, from cell lines to stem cells by incorporation of a mammalian expression cassette for the FUCCI construct. Compared with BacMam 1.0 technology, BacMam 2.0 does not require the use of an enhancer and can be used in complete medium. There is no need to purify plasmid or worry about vector integrity and quality. No lipids, dye-loading chemicals, or other potentially harmful treatments are required. BacMam 2.0 incorporates elements that greatly enhance transduction efficiency and expression levels: a pseudotyped capsid protein for more efficient cell entry, an enhanced CMV promoter, and the Woodchuck hepatitis post-transcriptional regulatory element (WPRE).

Titratable Expression that Lasts Up to Two Weeks
The transient transgene expression lasts from about 5 days in transformed cell lines to up to two weeks in slowly dividing cells, such as some primary cell types; we have imaged terminally differentiated neurons more than three weeks after transduction. In addition, BacMam technology permits defined optimization because it gives you the ability to precisely titrate expression levels. Baculoviruses do not replicate in mammalian cells, nor are viral genes expressed, giving them an excellent safety profile and lack of cytopathic effects on mammalian cells.

Learn more about the Premo™ FUCCI Cell Cycle Sensor


1. Sakaue-Sawano A, Kurokawa H, Morimura T, Hanyu A, Hama H, Osawa H, Kashiwagi S, Fukami K, Miyata T, Miyoshi H, Imamura T, Ogawa M, Masai H, Miyawaki A. Visualizing spatiotemporal dynamics of multicellular cell-cycle progression. Cell. 2008 Feb 8;132(3):487-98. PubMed PMID: 18267078

Related products
We offer a range of BacMam-based reagents beyond CellLight® reagents, including the BacMam GFP Transduction Control that is ideal to test out the technology and optimize transduction conditions, Premo™ Biosensors, including Premo™ Autophagy Sensor, ion channel drug targets, pathway analysis kits, and more.

Learn more about these products and the BacMam technology

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For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use.

EnzChek™ Elastase Assay Kit Invitrogen™

The EnzChek Elastase Assay Kit provides a sensitive, convenient and fast fluorometric method for measuring elastase or other protease activity in purified enzyme systems, cell/tissue lysates or for screening inhibitors in a high-throughput format. The substrate in the EnzChek kit is our BODIPY-FL-labeled DQ elastin conjugate that is highly labeled so that the fluorescence signal is quenched until enzymatic digestion yields highly fluorescent fragments.
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