ionomycin

Ionomycin is an calcium ionophore and an antibiotic that binds calcium ions (Ca2+). It is produced by the bacterium Streptomyces conglobatus.It is used in research to raise the intracellular calcium level (Ca2+) and as a research tool to understand Ca2+ transport across biological membranes. Ionomycin promotes apoptosis and induces the activation of protein kinase C (PKC).

Ionomycin calcium (SQ23377 calcium) is an effective and selective calcium ionophore, demonstrating high specificity for divalent cations (Ca>Mg>Sr=Ba).

NKH477 (Colforsin dapropate hydrochloride) is a derivative of forskolin with antidepressant activity. It inhibits ACh-induced Ca2+ mobilization by acting on ionomycin-sensitive storage sites. NKH477 is an adenylyl cyclase activator with bronchodilatory effects, inhibiting the production of CTL, T-cell proliferation in mixed lymphocyte reactions (MLR), as well as IL-2 production and mitogen responses.

Gliovirin is a fungal metabolite that has been found inT. harzianumand has fungicidal, antimicrobial and anti-inflammatory activities.1It is active against the plant pathogenic fungusP. ultimum(MIC = 60 ng/ml) and the parasiteT. brucei brucei(IC50= 90 ng/ml), but has no effect on the plant pathogenic fungiR. solani,P. omnivorum,T. basicola,R. arrhizus, andV. dahliaeor the bacteriaB. thuringiensis,P. fluorescens, andX. malvacearumwhen used at concentrations up to 1,000 ng/ml.2,3Gliovirin decreases phorbol 12-myristate 13-acetate (TPA)- and ionomycin-induced increased expression of COX-2 (IC50= 1 μM) and protein levels of IL-2 in Jurkat cells (IC50= 5.2 μM).1 1.Rether, J., Serwe, A., Anke, T., et al.Inhibition of inducible tumor necrosis factor-α expression by the fungal epipolythiodiketopiperazine gliovirinBiol. Chem.388(6)627-637(2007) 2.Howell, C.R., and Stipanovic, R.D.Gliovirin, a new antibiotic from Gliocladium virens, and its role in the biological control of Pythium ultimumCan. J. Microbiol.29(3)321-324(1983) 3.Iwatsuki, M., Otoguro, K., Ishiyama, A., et al.In vitro antitrypanosomal activity of 12 low-molecular-weight antibiotics and observations of structure/activity relationshipsJ. Antibiot. (Tokyo)63(10)619-622(2010)