Summary

改进的膜片钳记录的压力抛光移液器

Published: October 22, 2008
doi:

Summary

这是一个指导修改形状的玻璃微量。具体来说,通过热和空气压力的锥度不增加尖端张开扩大,导致较低的吸液管电阻。这是至关重要的,以获得小细胞低噪音录音,但在许多应用中非常有用。

Abstract

压力抛光塑造膜片钳记录玻璃移液器的方法。首先,我们开发了适合小(<3米)的神经元细胞体的录音编造移液器此方法。基本原理是类似玻璃吹制,并结合空气的压力和热量,修改形状由传统的微量车夫准备的补丁移液器。它可以应用到所谓的软(碱石灰)和硬(硼硅)眼镜。一般来说,抛光压力,可以减少25%,吸液管电阻不减少的尖端张开“(Goodman和Lockery,2000)直径。它可以适用于几乎任何类型的玻璃,只需要增加一个高压阀门及配件一个microforge。这种技术是必要的记录,从超小细胞(<5米)和,还可以通过单声道录音,最大限度地减少吸液管电阻。钝的形状也很有用穿孔膜片钳记录,因为这在一个较大的膜穿孔的气泡的笔尖形状结果。

Protocol

拉移液器使用灯丝一个车夫,如萨特的P – 97火焰山/布朗微电极拖轮,拉约10-20移液器。 选择你的玻璃。我们使用硼硅(BF150 – 86 – 10,OD = 1.5毫米,编号= 0.86毫米)。商店的玻璃,仔细,所以保持清洁和无尘。 设计一个拉动的程序。其主要目的是尖端张开约所需的大小,这将取决于应用程序。萨特的 P – 97移液器食谱 2是一个很好的参考。 在显微镜下?…

Discussion

我们最初开发这种方法使移液器有用2-3μm的神经元 C片钳记录线虫 1。它是在古德曼实验室常规使用。我们的压力不仅波兰移液器录制从微小的C。线虫的神经元,但也获得macropatch表示在爪蟾卵母细胞的离子通道和单通道录音。对于一个给定的尖端开口直径,生硬的造型产生一个低电阻的吸管。下吸液管电阻会导致较低的串联电阻和低噪声录音。

Acknowledgements

压力抛光技术的开发与SR Lockery合作。

Materials

Material Name Type Company Catalogue Number Comment
Glass Capillaries Consumable Sutter Instruments BF150-85-10 (or similar) The method works with any type of capillary except those made from quartz. However, we recommend using capillaries with a filament.
Inverted Microscope Microscope Leica DM IL (or similar) Any simple inverted microscope will do. However, it is essential to have sufficient magnification to see pipettes during polishing. We use a 100x metallurgical lens with a long working distance for this purpose.
Microforge Kit Tool ALA Science CPM-2 Supplies polishing coil, controller and foot pedal.
Air pressure source Tool ALA Science PR-60 Accessory for providing high pressure, includes a suitable valve. Alternatively, compressed air from the building can be used together with a filter/regulator (set to 40 PSI) and a 4-way valve (see below)
4-way valve Tool Cole-Parmer A-98150-01 Fittings will be needed to couple valve to tubing
Pipette Holder with Luer Connector Tool World Precision Instruments MPH-6S20 Use a male luer-to-barb fitting to connect pipette holder to high-pressure tubing
Tygon® tubing Tool Cole-Parmer 06408-62 Use this tubing to connect pipette holder to 4-way valve

References

  1. Goodman, M. B., Lockery, S. R. Pressure polishing: a method for re-shaping patch pipettes during fire polishing. . J Neurosci Methods. 100, 13-15 (2000).
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Cite This Article
Johnson, B. E., Brown, A. L., Goodman, M. B. Pressure-polishing Pipettes for Improved Patch-clamp Recording. J. Vis. Exp. (20), e964, doi:10.3791/964 (2008).

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