Molecular Probes™ Fluo-4, AM, cell permeant

Fluo-4, AM, cell permeant

Labeled calcium indicators are molecules that exhibit an increase in fluorescence upon binding Ca²⁺. Fluo-3 has been used to image the spatial dynamics of Ca²⁺ signaling, in flow cytometry experiments involving photoactivation of caged chelators, second messengers, and neurotransmitters, and for cell-based pharmacological screening. Fluo-4 is an analog of fluo-3 with the two chlorine substituents replaced by fluorines, which results in increased fluorescence excitation at 488 nm and consequently higher fluorescence signal levels. Cells may be loaded with the AM ester forms of these calcium indicators by adding the dissolved indicator directly to dishes containing cultured cells. These indicators are useful for fluorescence and confocal microscopy, flow cytometry, and microplate screening applications.

Calcium Indicator (AM Ester) Specifications:

Label (Ex/Em of Ca²⁺–bound form): Fluo-4 (494/506 nm)

Fluorescence intensity increase upon binding Ca²⁺: >100 fold

K_d for Ca²⁺ in buffer: ∼335 nM

Exhibit fluorescence increase upon binding Ca²⁺ with little shift in wavelength

Using TPEN to Control Heavy Metal Cations
In addition, BAPTA-based indicators such as these bind various heavy metal cations (e.g., Mn²⁺, Zn²⁺, Pb²⁺) with substantially higher affinity than Ca²⁺. Perturbations to calcium measurements caused by presence of these ions can be controlled using the heavy metal-selective chelator TPEN.

More Choices for Fluorescent Calcium Indicators
We offer a large selection of Molecular Probes™ calcium indicators for use in various experimental scenarios. For more information, review Fluorescent Ca²⁺ Indicators Excited with Visible Light—Section 19.3 in the Molecular Probes™ Handbook.

For UV-excitable Ca²⁺ indicators, protein-based Ca²⁺ indicators, conjugates of Ca²⁺ indicators, and for fluorescence-based indicators of other metal ions (i.e., Mg²⁺, Zn²⁺) review Indicators for Ca²⁺, Mg²⁺, Zn²⁺ and Other Metal Ions—Chapter 19 in the Molecular Probes™ Handbook.

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

For Use With (Equipment)

Confocal Microscope, Fluorescence Microscope, High Content Instrument, HTS Reader, Microplate Reader, Fluorescent Imager

Content And Storage

Store in freezer -5°C to -30°C and protect from light.

Dye Type

Fluorescent Dye-Based

Quantity

10 x 50μg

Detection Method

Fluorescent

Shipping Condition

Room Temperature

For Research Use Only. Not for use in diagnostic procedures.