The cloning and functional expression of the cyCav1 [11] and cyL
[10] subunits have previously been described. All clones were transcribed
using the T7 version of the mMessage mMachine kit (Ambion),
and the amount and purity of transcribed RNA were determined
by denaturation with glyoxal and gel electrophoresis. Oocytes
were injected with a constant amount of K1 RNA, combined either
with L subunit RNA or with an equivalent volume of water. RNA
was combined in a molar ratio of 1:3 K1 :L RNA in order to ensure
that the L subunit was present at saturating levels [6]. Oocytes were
incubated for 3^7 days; because levels of channel expression change
over time, recordings on any given day were made from oocytes in all
treatment groups. Two-electrode voltage clamp recordings were conducted
in a bath solution containing 40 mM Sr(OH)2, 40 mM Nmethylglucamine,
10 mM glucose, and 10 mM HEPES, adjusted to
pH 7.4 with methanesulfonic acid [12]. Sr2 was used as the charge
carrier due to its high permeance of the cyCav1 subunit [11]. All
oocytes were injected with 40 nl 100 mM BAPTA at least 1 h prior
The cloning and functional expression of the cyCav1 [11] and cyL[10] subunits have previously been described. All clones were transcribedusing the T7 version of the mMessage mMachine kit (Ambion),and the amount and purity of transcribed RNA were determinedby denaturation with glyoxal and gel electrophoresis. Oocyteswere injected with a constant amount of K1 RNA, combined eitherwith L subunit RNA or with an equivalent volume of water. RNAwas combined in a molar ratio of 1:3 K1 :L RNA in order to ensurethat the L subunit was present at saturating levels [6]. Oocytes wereincubated for 3^7 days; because levels of channel expression changeover time, recordings on any given day were made from oocytes in alltreatment groups. Two-electrode voltage clamp recordings were conductedin a bath solution containing 40 mM Sr(OH)2, 40 mM Nmethylglucamine,10 mM glucose, and 10 mM HEPES, adjusted topH 7.4 with methanesulfonic acid [12]. Sr2 was used as the chargecarrier due to its high permeance of the cyCav1 subunit [11]. Alloocytes were injected with 40 nl 100 mM BAPTA at least 1 h prior
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