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For electrophysiological analysis,MCF-7 cells were cultured in 35 mm petri dishes.Electrophysiological signals were recorded,amplified, digitized,and analyzed with the use of an Axopatch 200B patch-clamp (Axon Instruments,Burlingame,CA)in conjunction with Labmaster hardware(Digidata 1200,Axon Instruments)and Pclamp software(ver 6.03,Axon Instruments).The whole-cell mode of the patch-clamp technique was used with 4¨C7 MV resistance borosilicate fire-polished pipettes(Hirschmann 1 ,Laborgerate,Eberstadt,Germany).Seal resistance was typically in the 10¨C20 GV range.After formation of a seal,the amplifier was switched to voltage-clamp mode and currents attained stable values within 3¨C5 min.All recordings were made without leak subtraction.Results were expressed using current- densities(pA/pF)instead of current amplitude.The cell surface of the MCF-7 cells was thus estimated by measuring their membrane capacitance(20.8 4.7 pF,n?63).Whole-cell current was elicited by voltage ramp or by voltage step from 80 tot80 mV delivered at 30 sec intervals for 250 msec,applied from a holding potential of 40 mV.The cell under investigation was continuously superfused with control or test solutions. |
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Mally89: ½ð±Ò+1 2012-05-07 16:56:44
sltmac: ½ð±Ò+4 2012-05-11 08:06:18
whitney1989: ½ð±Ò+12, ·ÒëEPI+1, ¡ïÓаïÖú 2012-04-23 09:21:53
Mally89: ½ð±Ò+1 2012-05-07 16:56:44
sltmac: ½ð±Ò+4 2012-05-11 08:06:18
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2Â¥2012-04-23 00:02:37
whitney1989
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3Â¥2012-04-23 09:35:48
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4Â¥2012-04-23 10:40:36
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5Â¥2012-04-23 10:55:37














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