Conjugados de anexina V para la detección de apoptosis
Conjugados de anexina V para la detección de apoptosis
Invitrogen™

Conjugados de anexina V para la detección de apoptosis

Detecte las primeras etapas de la apoptosis con la anexina V independiente Alexa Fluor, APC, Pacific Blue, PE, FITC y conjugados de biotina mediante citometría de flujo.
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Número de catálogoExcitación/emisiónLíneas láser del citómetro de flujoConjugado
A35111565/578488, 532, 561PE
A13201495/519488Alexa Fluor 488
A13199494/518488FITC
A13202578/603532, 561Alexa Fluor 568
A23202346/442UVAlexa Fluor 350
A23204650/665633-637Alexa Fluor 647
A35108555/565532, 561Alexa Fluor 555
A35109679/702633-637Alexa Fluor 680
A35110650/660633-637APC (Aloficocianina)
A35122410/455405Pacific Blue
Número de catálogo A35111
Precio (USD)
878,04
Each
Añadir al carro de la compra
Excitación/emisión:
565/578
Líneas láser del citómetro de flujo:
488, 532, 561
Conjugado:
PE
Precio (USD)
878,04
Each
Añadir al carro de la compra
Consiga una detección rápida y fiable de la apoptosis celular temprana con conjugados independientes de anexina V para la detección de apoptosis. Los conjugados de anexina V ofrecen una diferencia de hasta 100 veces en la intensidad de la señal de fluorescencia entre células apoptóticas y no apoptóticas mediante citometría de flujo.
La anexina V tiene una alta afinidad a la fosfatidilserina (PS), que se expone en el recubrimiento externo de las células que experimentan apoptosis. Debido a esta afinidad, los reactivos de anexina V etiquetados fluorescentemente se utilizan comúnmente en la investigación de la apoptosis.

Los conjugados de anexina V proporcionan métodos de detección rápidos y fiables para estudiar la externalización de la fosfatidilserina, un indicador de las etapas intermedias de la apoptosis. La diferencia en la intensidad de la fluorescencia entre las células apoptóticas y no apoptóticas teñidas con nuestros conjugados de anexina V fluorescente, medida por citometría de flujo, suele ser de aproximadamente 100 veces.

En colaboración con Nexins Research BV, proporcionamos los mejores y más brillantes conjugados de anexina V disponibles, incluidos los conjugados de anexina V Alexa Fluor 350, 488, 555, 568, 594, 647 y 680, así como los conjugados de anexina V APC, biotina-X, FITC, Pacific Blue y PE. Los conjugados de anexina V altamente fluorescente proporcionan métodos de detección rápidos y fiables para el estudio de la externalización de la fosfatidilserina, uno de los primeros indicadores de apoptosis.

El conjugado de anexina V Pacific Blue es excitable con violeta, lo que lo hace ideal para instrumentos con un láser violeta y para experimentos multicolor que incluyan colorantes verdes o rojos fluorescentes.

Los beneficios de nuestros conjugados de anexina V incluyen:
• Conjugado con los colorantes Invitrogen Alexa Fluor y eFluor para señales más brillantes
• Conjugado para todos los láseres disponibles
• Disponible como reactivos independientes o kits fáciles de usar

La tinción de anexina V para detectar células apoptóticas solo se puede realizar en células y tejidos vivos. Si las muestras se van a fijar después de la tinción, se requieren condiciones específicas para lograr la retención transitoria de la señal. Estas incluyen el uso de un método de fijación a base de aldehídos sin alcohol, el uso de tampones que contengan Ca2+ y evitar los tensioactivos/detergentes. Para su comodidad, también ofrecemos un tampón concentrado de unión a anexina que facilita la unión de la anexina V a la fosfatidilserina en ensayos de apoptosis.

For Research Use Only. Not for use in diagnostic procedures.
Especificaciones
ColorRojo
DescripciónConjugado de anexina V y PE (R-PE anexina V) (sustituye al producto de anexina AnnexinV04)
Excitación/emisión565/578
Líneas láser del citómetro de flujo488, 532, 561
Para utilizar con (equipo)Citómetro de flujo
FormularioSolución
Contenido del kitContiene un vial de anexina V, conjugado R-PE.
N.º de reacciones50
Tipo de productoConjugado de anexina V
Cantidad250 μL
Condiciones de envíoHielo húmedo
ConjugadoPE
Unit SizeEach
Contenido y almacenamiento
Almacenar en el refrigerador (2 °C a 8 °C) y proteger de la luz.

Preguntas frecuentes

I trypsinized my adherent cells and labeled with annexin V, and now my flow data is showing a high percentage of apoptotic cells even for control, untreated cells. What is the problem?

Trypsinization or mechanical scraping of cells temporarily disrupts the plasma membrane, allowing annexin V to bind phosphatidylserine on the cytoplasmic surface of the cell membrane and thus leading to false positive staining. Allow the cells to recover for about 30 minutes in optimal cell culture conditions and medium after trypsinizing/scraping so that they can recover their membrane integrity before staining. For lightly adherent cell lines, such as HeLa and NIH 3T3, another option is to use non-enzyme treatments like Gibco Cell Dissociation Buffer (Cat. No. 13151014).

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

Can I detect annexin V staining in an imaging assay?

Annexin V staining is not typically used in imaging experiments; it is a better reagent for flow cytometry analysis. All cells will stain to some extent, so it can be difficult to distinguish a relatively bright annexin V-stained cell from a dimmer non-apoptotic cell. Caspase activation, detected using our CellEvent Caspase 3/7 or Image-iT LIVE Caspase detection kits, is a better method for detecting apoptosis in an imaging assay.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

When should I stain adherent cells with annexin V for flow cytometric analysis? Before or after I trypsinize them?

Trypsinize first and then allow the cells to recover about 30 minutes in optimal cell culture conditions and medium before staining with annexin V conjugates. Trypsinization or mechanical scraping of cells temporarily disrupts the plasma membrane, allowing for annexin V to bind phosphatidylserine on the cytoplasmic surface of the cell membrane and thus leading to false positive staining. For lightly adherent cell lines such as HeLa and NIH 3T3, you could use a less harsh (non-enzymatic) dissociation product like Gibco Cell Dissociation Buffer (Cat. No. 13151014).

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

Can I fix my cells after annexin V staining?

Yes, this is possible. We have established protocols for annexin V staining combined with intracellular staining of lymphocytes that can be found here. The most important step is to leave some binding buffer in the suspension when fixation is started. Compared to staining of live cells, the intensity of the annexin V signal may be somewhat reduced.

I am trying to label adherent cells with annexin V and am finding that everything is getting labeled. How can I fix this?

Treating cells with trypsin or other reagents to detach adherent cells causes damage to the membrane, such that cells will be labeled with annexin V. The best way to avoid this problem is to allow your cells to recover for 30-45 min in the incubator. Swirl the tube/plate/flask every few minutes to prevent re-attachment. After this recovery period, you can label your cells with annexin V and analyze by flow cytometry.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

Citations & References (21)

Citations & References
Abstract
Human fetal retinal pigment epithelial cells induce apoptosis in the T-cell line Jurkat.
Authors:Farrokh-Siar L, Rezai KA, Semnani RT, Patel SC, Ernest JT, Peterson EJ, Koretzky GA, van Seventer GA
Journal:Invest Ophthalmol Vis Sci
PubMed ID:10359333
'PURPOSE: To investigate the mechanism(s) involved in human fetal retinal pigment epithelium (HFRPE)-mediated T-cell death. METHODS: Pure HFRPE cells were isolated and cultured. Normal and interferon (IFN)-gamma-activated HFRPE from early and late in vitro passages were incubated with cells from the human T-cell leukemia line Jurkat (Jkt). Cultures were pulsed ... More
High-resolution mapping reveals topologically distinct cellular pools of phosphatidylserine.
Authors:Fairn GD, Schieber NL, Ariotti N, Murphy S, Kuerschner L, Webb RI, Grinstein S, Parton RG,
Journal:J Cell Biol
PubMed ID:21788369
'Phosphatidylserine (PS) plays a central role in cell signaling and in the biosynthesis of other lipids. To date, however, the subcellular distribution and transmembrane topology of this crucial phospholipid remain ill-defined. We transfected cells with a GFP-tagged C2 domain of lactadherin to detect by light and electron microscopy PS exposed ... More
Cigarette smoke extract induces oxidative stress and apoptosis in human lung fibroblasts.
Authors:Carnevali S, Petruzzelli S, Longoni B, Vanacore R, Barale R, Cipollini M, Scatena F, Paggiaro P, Celi A, Giuntini C
Journal:Am J Physiol Lung Cell Mol Physiol
PubMed ID:12547733
'Cigarette smoke is a mixture of chemicals having direct and/or indirect toxic effects on different lung cells. We investigated the effect of cigarette smoke on human lung fibroblasts (HFL-1) oxidation and apoptosis. Cells were exposed to various concentrations (1, 5, and 10%) of cigarette smoke extract (CSE) for 3 h, ... More
Pseudomonas aeruginosa-induced apoptosis is defective in respiratory epithelial cells expressing mutant cystic fibrosis transmembrane conductance regulator.
Authors:Cannon CL, Kowalski MP, Stopak KS, Pier GB
Journal:Am J Respir Cell Mol Biol
PubMed ID:12878584
'Chronic lung infection with Pseudomonas aeruginosa constitutes the most severe manifestation of cystic fibrosis, a scenario that results from defects in early clearance of the microbe. Early clearance involves epithelial cell ingestion of bacteria, rapid activation of nuclear factor-kappa B and cellular desquamation within minutes of P. aeruginosa infection, processes ... More
N- and O-glycans modulate galectin-1 binding, CD45 signaling, and T cell death.
Authors:Earl LA, Bi S, Baum LG,
Journal:J Biol Chem
PubMed ID:19920154
'Galectin-1, a beta-galactoside-binding protein highly expressed in the thymus, induces apoptosis of specific thymocyte subsets and activated T cells. Galectin-1 binds to N- and O-glycans on several glycoprotein receptors, including CD7, CD43, and CD45. Here we show that galectin-1 signaling through CD45, which carries both N- and O-glycans, is regulated ... More