Read the latest issue of the ProbesOnline E-Newsletter.
In This Issue
|Analyze and Visualize Cells Right at Your Bench — the Tali™ Image-Based Cytometer|
|Optimize Your Flow Cytometry Panel — Trial-Size Antibody Conjugates for the Violet Laser|
|Study HIF-1α With New Recombinant Antibodies — ABfinity™ Recombinant Rabbit Monoclonal Antibodies|
|Measure IL-23 Cytokine Levels — Human IL-23 Heterodimer ELISA Kit|
|One-Step Protocol for Antibody Labeling|
|Enhancing GFP Detection in Neurons|
|Weak Signal? A Case for TSA|
International Society for Stem Cell Research (ISSCR)
Metro Toronto Convention Centre
Toronto, Ontario, Canada
Southeast Flow Cytometry Interest Group
Georgia Center for Continuing Education
Western New York Flow Users Group
University of Rochester Medical Center
|NEW! BioProbes® 65
FEATURED NEW PRODUCTS
what it is
The Tali™ Image-Based Cytometer is a three-channel (bright-field, green and red fluorescence) benchtop assay platform that uses state-of-the-art optics, an intuitive user interface, and image analysis to perform suspension cell–based assays for GFP and RFP expression, apoptosis, cell viability, and cell counting.
what it offers
- Quantify fluorescent protein expression
- Analyze cell populations and cellular events (e.g., apoptosis by annexin V staining)
- Get quantitative results with visual confirmation
how it works
Three-parameter population analysis using the Tali™ Image-Based Cytometer can be completed in approximately 1 minute using 25 µL of sample. The Tali™ cytometer performs analyses by simultaneously capturing a series of bright-field and fluorescent images and then using sophisticated digital image analysis algorithms to determine the total and fluorescent cell counts and calculate their concentrations. The Tali™ cytometer provides the option to save the assay data and to export the data as a report.
- Learn More About the Tali™ Image-Based Cytometer
|Tali™ Image-Based Cytometer||1 instrument||T10796|
|Tali™ Cellular Analysis Slides—50 slides||1 box||T10794|
|Tali™ Cellular Analysis Slides—500 slides||10 boxes||T10795|
|Tali™ Calibration Beads||1 kit||T10790|
|Tali™ Viability Kit—Dead Cell Red||1 kit||A10786|
|Tali™ Viability Kit—Dead Cell Green||1 kit||A10787|
|Tali™ Apoptosis Kit—Annexin V Alexa Fluor® 488 and Propidium Iodide||1 kit||A10788|
what they are
Molecular Probes® flow cytometry antibodies in a trial size provide a convenient method for evaluating antibodies for your flow cytometry panel. These 405 nm–excitable fluorescent conjugates are designed to maximize use of the violet laser.
what they offer
- 25-test size ideal for panel optimization
- Available conjugates include Pacific Blue™ and Pacific Orange™ dyes, and Qdot® nanocrystals
- Stocked in Supply Centers upon request
how they work
Our most popular flow cytometry antibody conjugates for the violet laser are now available in a 25-test trial size. This convenient size allows you to easily and affordably test the compatibility of these markers and fluorescent conjugates to optimize or expand your current immunophenotyping panels.
- Learn More About Antibodies for Flow Cytometry
Multicolor analysis of CD3-positive and CD4-positive cell populations using Qdot® primary antibody conjugates.
Human PBLs were stained with Qdot® 605 anti-CD4 and Qdot® 655 anti-CD3 antibodies. Lymphocytes were analyzed for fluorescence using violet diode laser excitation and a 603/48 emission filter for the anti-CD4 Qdot® 605 conjugate, and 488 nm laser excitation and a 640LP emission filter for the anti-CD3 Qdot® 655 conjugate. Samples were run on the Attune® Acoustic Focusing Cytometer.
|CD3||Qdot® 655||S4.1||25 tests||Q10484|
|Pacific Blue™ dye||S4.1||25 tests||MHCD0328TR|
|Pacific Orange™ dye||UCHT1||25 tests||CD0330TR|
|CD4||Qdot® 605||S3.5||25 tests||Q10480|
|Qdot® 655||S3.5||25 tests||Q10482|
|Qdot® 705||S3.5||25 tests||Q10485|
|Pacific Blue™ dye||S3.5||25 tests||MHCD0428TR|
|Pacific Orange™ dye||S3.5||25 tests||MHCD0430TR|
|CD8||Qdot® 605||3B5||25 tests||Q10481|
|Qdot® 705||3B5||25 tests||Q10483|
|Pacific Blue™ dye||3B5||25 tests||MHCD0828TR|
|Pacific Orange™ dye||3B5||25 tests||MHCD0830TR|
|CD14||Pacific Blue™ dye||TüK4||25 tests||MHCD1428TR|
|Pacific Orange™ dye||TüK4||25 tests||MHCD1430TR|
|CD15||Pacific Orange™ dye||VIMC6||25 tests||MHCD1530TR|
|CD27||Qdot® 655||CLB-27/1||25 tests||Q10486|
|CD45||Pacific Blue™ dye||HI30||25 tests||MHCD4528TR|
|Pacific Orange™ dye||HI30||25 tests||MHCD4530TR|
|CD95||Pacific Blue™ dye||DX2||25 tests||MHCD9528TR|
|CD4||Pacific Blue™ dye||RM4-5||25 tests||MCD0428TR|
|CD8||Pacific Blue™ dye||5H10||25 tests||MCD0828TR|
|Pacific Orange™ dye||5H10||25 tests||MCD0830TR|
|CD45R||Pacific Orange™ dye||RA3-6B2||25 tests||RM2630TR|
what they are
Hypoxia-inducible factor (HIF-1) is a transcription factor complex made up of alpha and beta subunits. Under hypoxic conditions, HIF-1α localizes to the nucleus and binds with HIF-1β to regulate vascular endothelial growth factor (VEGF). In certain cancers, this activity can lead to tumor progression, making HIF-1α a potential target for therapeutics.
what it offers
- Recombinant antibodies enable consistent results
- New antibodies released every month
how they work
ABfinity™ recombinant rabbit monoclonal antibodies help ensure consistent antibody performance lot after lot, so you don’t have to revalidate dilutions for your experiments when you order more. HIF-1α antibodies are available as ABfinity™ Recombinant Rabbit Monoclonal and Recombinant Oligoclonal antibody preparations, and are validated in western blotting and ELISA applications.
- Learn More About the ABfinity™ Recombinant Rabbit Monoclonal Antibodies
- Find Primary and Secondary Antibodies
|HIF-1α ABfintiy™ Recombinant Rabbit Monoclonal Antibody||100 µg||700505|
|HIF-1α ABfinity™ Recombinant Rabbit Oligoclonal Antibody||100 µg||710059|
|VEGF Mouse Monoclonal Antibody||100 µg||AHG0114|
what it is
The Invitrogen™ Human IL-23 ELISA Kit allows accurate quantitation of IL-23 in serum or cell culture supernatant samples. IL-23 is a heterodimeric cytokine that plays a major role in survival and expansion of Th17 cells. IL-23 has a role in the development of both autoimmune and inflammatory disorders.
what it offers
- Validated in relevant cell models, THP-1 induced with either LPS or SAA-1
- Specificity—no cross-reactivity with 25 relevant human markers
- Sensitivity—less than 2 pg/mL
how it works
The Human IL-23 ELISA Kit is a conventional sandwich ELISA assay that is completed after 4 hours of incubation time. The 96-well plates are precoated with IL-23 antibody. Samples are incubated, followed by several sequential incubations, and quantitative results are obtained using a microplate reader.
- Learn More About the Invitrogen™ ELISA Kits
Human IL-23 ELISA Kit protocol.
All three Molecular Probes® protein labeling kits produced fluorescent conjugates that effectively stained cells, even without the column purification step. Furthermore, we found that the addition of Image-iT® FX Signal Enhancer to cells prior to staining with the labeled conjugate reduced the slight background fluorescence from free dye, producing results that were nearly indistinguishable from those obtained with a column-purified conjugate. More importantly, we found that, even without the column purification step, the Molecular Probes® protein labeling kits produced fluorescent conjugates that were far superior to those produced with the other one-step labeling kits, in terms of signal strength and background fluorescence. Thus, with this new simplified workflow, the Molecular Probes® protein labeling kits offer one-step labeling convenience with high yields and bright results.
We offer a wide selection of protein labeling kits for covalently labeling 20 μg to 3 mg of protein with a range of Alexa Fluor® dyes, as well as with biotin and several classic fluorophores including fluorescein, Oregon Green® 488, and Texas Red® dyes.
- Learn More About Antibody Labeling
|Alexa Fluor® 488 Monoclonal Antibody Labeling Kit||1 kit||A20181|
|Alexa Fluor® 488 Protein Labeling Kit||1 kit||A10235|
|Alexa Fluor® 647 Monoclonal Antibody Labeling Kit||1 kit||A20186|
|Alexa Fluor® 647 Protein Labeling Kit||1 kit||A20173|
|SAIVI™ Alexa Fluor® 647 Antibody/Protein Labeling Kit||1 kit||S30044|
|Image-iT® FX Signal Enhancer||10 mL||I36933|
Dr. Nagy and colleagues demonstrated the sensitivity of Anti-GFP ABfinity™ Rabbit Recombinant Monoclonal Antibody using tyrosine hydroxylase (TH)–GFP transgenic mice. These mice were generated to express GFP under the control of the TH gene promoter in the majority of midbrain dopamine neurons, and are useful for the study of the physiology and pathogenesis of dopamine neurons . Cryosections from the substantia nigra and cortex were fixed in 4% formaldehyde, and GFP signal was enhanced using anti-GFP ABfinity™ antibody as the primary antibody and Alexa Fluor® 594 goat anti–rabbit IgG as the secondary antibody. Results showed that the signal from endogenous GFP expression was enhanced by the anti-GFP antibody, and this enhancement was not obtained using an anti-GFP antibody from a leading competitor.
The highly sensitive anti-GFP ABfinity™ antibody allows detailed visualization of neuronal structures such as cell bodies, axons, and dendrites. This antibody is also suitable for other applications, including western blots, immunoprecipitation, ELISA, flow cytometry, and fluorescent imaging.
1. Matsushita N, Okada H, Yasoshima Y et al. (2002) J Neurochem 82:295–304.
Visualizing neurons in transgenic mice. Fixed cryosections of substantia nigra of TH-GFP transgenic mice. With the use of Anti-GFP ABfinity™ Rabbit Recombinant Monoclonal Antibody, the dendrites and axons are revealed, which is not possible with endogenous expression or with a competitor's antibody.
- Learn More About Anti-GFP Antibodies
- Learn More About ABfinity™ Recombinant Rabbit Monoclonal Antibodies
- Find Primary and Secondary Antibodies
|Anti-GFP, rabbit monoclonal||G10362|
|Anti-GFP, rabbit IgG fraction||A11122|
|Anti-GFP, mouse IgG2a||A11120|
|Anti-GFP, rabbit serum (polyclonal)||A6455|
|Anti-GFP, rabbit IgG fraction, Alexa Fluor® 488 conjugate||A21311|
|Anti-GFP, mouse IgG1||A11121|
|Anti-GFP, chicken IgY fraction||A10262|
|Anti-RFP, rabbit IgG polyclonal||R10367|
|Anti-GFP, rabbit IgG fraction, Alexa Fluor® 555 conjugate||A31851|
|Anti-GFP, rabbit IgG fraction, Alexa Fluor® 594 conjugate||A21312|
|Anti-GFP, rabbit IgG fraction, Alexa Fluor® 647 conjugate||A31852|
|Alexa Fluor® 594 goat anti-rabbit IgG (H+L)||A11012|
|* ICC = immunocytochemistry; IHC = cryosection immunohistochemistry; IP = immunoprecipitation; WB = western blot.|
Powerful Signal Amplification
Tyramide signal amplification (TSA) is an enzyme-mediated detection method that uses the catalytic activity of horseradish peroxidase (HRP) to generate high-density labeling of a target protein or nucleic acid sequence in situ. The Molecular Probes® TSA Detection Kits combine the versatile and powerful TSA technology with our high-performance Alexa Fluor® dyes, as well as our classic dyes like Oregon Green® and Pacific Blue™. The technology can also be used with colorimetric detection systems using our TSA biotin or DNP kits.
Applications of TSA Technology
For low-abundance targets, poor antibodies, or other reasons for a low signal, TSA technology has been proven in a number of systems and applications. The signal amplification derived from multiple tyramide substrates per peroxidase label translates to ultrasensitive detection of low-abundance targets and the use of smaller amounts of antibodies and hybridization probes. The increased sensitivity afforded by TSA technology can be critically important for detection of short oligonucleotide probes and low-abundance mRNAs by fluorescence in situ hybridization (FISH). Optimal probe concentrations are typically 2- to 10-fold lower for TSA-detected FISH than for conventional immunocytochemical detection procedures.
click to enlarge
Signal amplification in a zebrafish retina. A zebrafish cryosection was incubated with the biotin-XX conjugate of mouse monoclonal anti–α-tubulin antibody. The signal was amplified with TSA Kit #22, which includes HRP–streptavidin and Alexa Fluor® 488 tyramide. The sample was then incubated with a mouse monoclonal FRet 6 antibody and visualized with Alexa Fluor® 647 goat anti–mouse IgG, which is pseudocolored magenta. Finally, the nuclei were counterstained with SYTOX® Orange Nucleic Acid Stain.
|Mouse monoclonal anti–α-tubulin antibody||50 µg||A21371|
|TSA Kit #22||1 kit||T20932|
|Alexa Fluor® 647 goat anti–mouse IgG||0.5 mL||A21235|
|SYTOX® Orange Nucleic Acid Stain||250 mL||S11368|
click to enlarge
Multiplex imaging of apoptosis.
U2OS cells were treated with 30 μM etoposide for 18 hr to induce apoptosis. The treated cells were stained first with 7.5 μM CellEvent™ Caspase-3/7 Green Detection Reagent (Cat. No. C10423, green fluorescence) to detect apoptosis, and Hoechst 33342 nucleic acid stain (Cat. No. H3570, blue fluorescence) to label nuclei, and then with 150 nM MitoTracker® Deep Red FM (Cat. No. M22426, pink fluorescence) to label mitochondria. Following fixation and permeabilization, actin was labeled with Alexa Fluor® 546 phalloidin (Cat. No. A22283, orange fluorescence). Image contributed by Michelle Yan, Life Technologies Corporation.
|CellEvent™ Caspase-3/7 Green Detection Reagent||100 µL||C10423|
|MitoTracker® Deep Red FM||20 x 50 µg||M22426|
|Hoechst 33342||100 µL||H3570|
|Alexa Fluor® 546 Phalloidin||300 units||A22283|
Kim JY, Wei Y, Li J, Kim SO (2010) Biosens Bioelectron 26:555–559.
In a recent publication, Kim et al. describe an innovative new approach for inducing apoptosis in cancer cells. The authors used a "microplasma jet" device to precisely deliver atmospheric-pressure plasma—composed of ionized charged particles, free electrons, and radicals—into individual cultured murine melanoma tumor cells. Using the Click-iT® TUNEL Alexa Fluor® 488 Imaging Assay for Apoptosis, which employs click chemistry for the detection of DNA fragmentation associated with apoptosis, the authors observed the induction of apoptosis in a dose-dependent manner. Furthermore, the tumor cells were more sensitive to plasma treatment than murine fibroblast cells. The authors speculate that this novel microplasma jet technology can be used to support targeted cancer therapy approaches with improved precision.
- View the Bibliography Reference
- Learn More About Click-iT® TUNEL Assay for Apoptosis
The Molecular Probes® Handbook
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