Revision 1

#9995Store at -20C

2.5 mg

Cell Signaling Technology

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For Research Use Only. Not for Use in Diagnostic Procedures.

Background

Ionomycin is a potent and selective calcium ionophore agent (1,2). The molecule acts as a motile Ca2+ carrier and enhances Ca2+ influx by direct stimulation of store-regulated cation entry across biological membranes (3). At the micromolar level, ionomycin can activate Ca2+/Calmodulin dependent kinase and phosphatase to stimulate gene expression (4). In human T cells, ionomycin induces hydrolysis of phosphoinositides and activates PKC to mediate T cell activation (5). Ionomycin treatment of human B cells induces the activation of calcium-dependent endonuclease and results in apoptosis (6). Ionomycin treatment of bovine aortic endothelial cells (BAECs) induces rapid dephosphorylation of eNOS at Thr495 and mediates eNOS activation (7).

  1. Liu, C. and Hermann, T.E. (1978) J Biol Chem 253, 5892-4.
  2. Kauffman, R.F. et al. (1980) J Biol Chem 255, 2735-9.
  3. Morgan, A.J. and Jacob, R. (1994) Biochem J 300 ( Pt 3), 665-72.
  4. Lobo, F.M. et al. (1999) J Immunol 162, 2057-63.
  5. Chatila, T. et al. (1989) J Immunol 143, 1283-9.
  6. Aagaard-Tillery, K.M. and Jelinek, D.F. (1995) J Immunol 155, 3297-307.
  7. Lin, M.I. et al. (2003) J Biol Chem 278, 44719-26.

Molecular Formula

C41H70O9 • Ca2+

Molecular Weight

747.08 g/mol

Purity

>99%

CAS

56092-82-1

Solubility

Soluble in DMSO at 1.6mg/ml and EtOH at 20mg/ml.

Storage

Store lyophilized or in solution at -20ºC, desiccated. Protect from light. In lyophilized form, the chemical is stable for 24 months. Once in solution, use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.

Directions for Use

Ionomycin, calcium salt is supplied as 2.5 mg powder. Store at or below -20ºC. Before use, dissolve powder in 1.1 ml DMSO to make a 3 mM ionomycin stock solution. For working concentrations of 1 μM-3 μM, dilute DMSO stock 1:3000 to 1:1000. Treat cells with the desired concentration for intended time.

Background References

    Cross-Reactivity Key

    H: human M: mouse R: rat Hm: hamster Mk: monkey Vir: virus Mi: mink C: chicken Dm: D. melanogaster X: Xenopus Z: zebrafish B: bovine Dg: dog Pg: pig Sc: S. cerevisiae Ce: C. elegans Hr: horse GP: Guinea Pig Rab: rabbit All: all species expected

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    Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
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