Ionomycin calcium salt is a calcium ionophore [1].
Ca2+ ionophore acts as a Ca2+ ionophore, allowing Ca2+ to cross cell membranes.
Ionomycin calcium salt is a calcium ionophore. In cultured chicken pectoralis muscle, ionomycin (10-6-10-5 M) selectively increased the incorporation of methionine into two proteins. Ionomycin increased influx of extracellular Ca2+ and increased Ca2+ concentration in the cytoplasm, which then regulated the synthesis of muscle proteins [2]. In rat parotid gland, ionomycin increased 86Rb efflux, 22Na uptake and 3H-protein secretion, which were dependent on increasing cytosolic Ca2+. In parotid cells, ionomycin released the receptor-regulated cellular Ca2+ pool [3]. In human bladder cancer cells HT1376, ionomycin significantly inhibited cell growth in a time- and dose-dependent way and induced apoptotic DNA degradation. Also, ionomycin reduced the ratios of Bcl-2 to Bax mRNA and protein [4].
In athymic nude mice bearing HT1376 tumors, ionomycin significantly inhibited tumor growth and reduced the tumorigenicity [4].
References: [1]. Liu C, Hermann TE. Characterization of ionomycin as a calcium ionophore. J Biol Chem, 1978, 253(17): 5892-5894. [2]. Roufa D, Wu FS, Martonosi AN. The effect of Ca2+ ionophores upon the synthesis of proteins in cultured skeletal muscle. Biochim Biophys Acta, 1981, 674(2): 225-237. [3]. Poggioli J, Leslie BA, McKinney JS, et al. Actions of ionomycin in rat parotid gland. J Pharmacol Exp Ther, 1982, 221(1): 247-253. [4]. Miyake H, Hara I, Yamanaka K, et al. Calcium ionophore, ionomycin inhibits growth of human bladder cancer cells both in vitro and in vivo with alteration of Bcl-2 and Bax expression levels. J Urol, 1999, 162(3 Pt 1): 916-921.
Small Molecules with Blue Ice, Modified Nucleotides with Dry Ice.
General tips
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Protocol
Cell experiment:[1]
Cell lines
Human bladder cancer cell line HT1376
Reaction Conditions
0 ~ 100 μg/ml ionomycin for 0 ~ 96 h incubation
Applications
The in vitro growth rate of HT1376 cells was suppressed by ionomycin in a dose- and time-dependent manner. After continuous treatment with 10 μg/ml ionomycin, characteristic apoptotic DNA degradation, as well as marked decreases in the ratios of Bcl-2 to Bax mRNA and protein could be observed in HT1376 cells.
Animal experiment:[1]
Animal models
Athymic nude mice bearing HT1376 tumors
Dosage form
50 μg of ionomycin in 100 μl PBS
Injected intratumorally three times weekly for 4 weeks
Applications
Intratumoral injection of ionomycin into subcutaneous HT1376 tumors reduced the tumorigenicity in nude mice. Furthermore, these in vivo growth-inhibitory effects of ionomycin were significantly enhanced by pretreatment with cisplatin.
Note
The technical data provided above is for reference only.
References:
1. Miyake H, Hara I, Yamanaka K, et al. Calcium ionophore, ionomycin inhibits growth of human bladder cancer cells both in vitro and in vivo with alteration of Bcl-2 and Bax expression levels. The Journal of Urology, 1999, 162(3 Pt 1): 916-921.
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