biostudies-literatureUnknown7(6)Vasilev FIonomycin is a Ca(2+)-selective ionophore that is widely used to increase intracellular Ca(2+) levels in cell biology laboratories. It is also occasionally used to activate eggs in the clinics practicing in vitro fertilization. However, neither the precise molecular action of ionomycin nor its secondary effects on the eggs' structure and function is well known. In this communication we have studied the effects of ionomycin on starfish oocytes and zygotes. By use of confocal microscopy, calcium imaging, as well as light and transmission electron microscopy, we have demonstrated that immature oocytes exposed to ionomycin instantly increase intracellular Ca(2+) levels and undergo structural changes in the cortex. Surprisingly, when microinjected into the cells, ionomycin produced no Ca(2+) inPloS onee39231https://www.ebi.ac.uk/biostudies/studies/S-EPMC3377674biostudies-literatureEffects of ionomycin on egg activation and early development in starfish.PMC3377674Chun JTSantella LGarante EVasilev FGragnaniello GfalseEffects of ionomycin on egg activation and early development in starfish.Ionomycin is a Ca(2+)-selective ionophore that is widely used to increase intracellular Ca(2+) levels in cell biology laboratories. It is also occasionally used to activate eggs in the clinics practicing in vitro fertilization. However, neither the precise molecular action of ionomycin nor its secondary effects on the eggs' structure and function is well known. In this communication we have studied the effects of ionomycin on starfish oocytes and zygotes. By use of confocal microscopy, calcium imaging, as well as light and transmission electron microscopy, we have demonstrated that immature oocytes exposed to ionomycin instantly increase intracellular Ca(2+) levels and undergo structural changes in the cortex. Surprisingly, when microinjected into the cells, ionomycin produced no Ca(2+) in2012-01-01T00:00:00Z20122025-04-04T18:55:40.085Z2019-03-26T23:10:29ZS-EPMC33776742272397010.1371/journal.pone.0039231