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3 protocols using oregon green bapta 5n

1

Protocols for Cardiac Cell Experiments

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Krebs-Henseleit (K-H) solution (in mmol/l): 118 NaCl, 4.7 KCl, 1.66 MgCl2, 2 CaCl2, 1.18 KH2PO4, 15 NaHCO3, 11 glucose, pH 7.35, saturated with 95% O2 and 5% CO2.
Tyrode solution (in mmol/l): 135 NaCl, 5.4 KCl, 5 MgCl2, 1 CaCl2, 0.33 NaH2PO4, 10 HEPES, pH 7.3.
Ca-free Tyrode solution (in mmol/l): 135 NaCl, 5.4 KCl, 5 MgCl2, 0.02 CaCl2, 0.33 NaH2PO4, 10 HEPES, pH 7.3.
Enzyme solution (in mmol/l): 135 NaCl, 5.4 KCl, 5 MgCl2, 0.02 CaCl2, 0.33 NaH2PO4, 10 HEPES, 0.19 U ml−1 Liberase Blendzyme 3 (Roche Diagnostics, Basel, Switzerland), pH 7.3.
Storage solution (in mmol/l): 106 CH3SO3H, 106 KOH, 3.9 KCl, 2.4 MgSO4, 8 K2HPO4, 1 ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid (EGTA), 22 taurine, 22 glucose, pH 7.3.
Cacodylate buffer (in mmol/l): 150 Na cacodylate, 2 CaCl2, pH 7.3.
External solution (in mmol/l): 135 NaCl, 5.4 CsCl, 10 HEPES, 5 MgCl2, 0.33 NaH2PO4, 1 CaCl2, 0.01 IBMX, 0.02 TTX, pH 7.3.
Internal solution (in mmol/l): 135 CsCH3SO3, 10 CsCl, 10 HEPES, 2 EGTA, 2 CaEGTA, 3 MgSO4, 3 ATPNa2, 1 Oregon Green BAPTA-5N (Thermo Fisher Scientific, Brno, Czech Republic), 0.05 cAMP, pH 7.3; 100 nM free [Ca2+].
Chemicals were from Sigma-Aldrich (USA), if not stated otherwise.
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2

Characterization of Membrane Proteins

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N-Octyl-β-d-glucoside (βOG),
ethylenediamine-N-N-N′-N′-tetraacetic
acid (EDTA), and 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic
acid (HEPES) were purchased from Dojindo Laboratories (Kumamoto, Japan).
Ethanol, isopropyl-β-d(−)-galactopyranoside
(IPTG), 2-amino-2-hydroxymethyl-1,3-propanediol (Tris), sodium phosphate,
lysozyme, sucrose, glucose, urea, glycine, NaCl, NaF, KCl, and CaCl2 were purchased from Wako Pure Chemical Industries, Ltd. (Osaka,
Japan). Polyethylene glycol mono-p-isooctylphenyl
ether (Triton X-100) was purchased from Nacalai Tesque Inc., (Kyoto,
Japan). 1,2-Dioleoyl-sn-glycero-3-phosphocholine
(DOPC) and 1,2-dioleoyl-sn-glycero-3-phospho-(1′-rac-glycerol) (sodium salt) (DOPG) were purchased from Avanti
Polar Lipids Inc. (Alabaster, AL, USA). Alexa Fluor 546 carboxylic
acid, succinimidyl ester, Oregon Green BAPTA-5N, and hexapotassium
salt were purchased from Thermo Fisher Scientific (Waltham, MA, USA).
Calcein was purchased from Sigma-Aldrich (St. Louis, MO, USA). 5-Carboxyfluorescein
was purchased from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan).
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3

Calcium Imaging of Axonal Varicosities

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Epifluorescence imaging was performed with two LEDs on a dual lamp-house controlled by an OptoLed (Cairn Research). The first LED excited the sample at 470 ± 40 nm and the second LED at 572 ± 35 nm. Emitted light (520 ± 40 nm and 630 ± 60 nm) was detected with an electron-multiplying charge-coupled device camera (Ixon; Andor). Filters were from Chroma Technology. For calcium imaging, the calcium indicator Oregon Green BAPTA-5N (OGB5) was included in the presynaptic IS at a final concentration of 500 µM and Oregon Green BAPTA-1 (OGB1) at a final concentration of 100 µM (both from Thermo Fisher Scientific). After an axonal varicosity was identified, it was positioned on the center of the camera chip by moving the preparation, and fluorescent images were acquired at a frame rate of 4.5 ms (218 Hz), in 2 × 2 binned pixels, with Andor Solis software. Fluorescence recordings presented in Figs. 3 and 4 correspond to averages of four or five interleaved (control and test protocols) trials and were acquired through the 60× Olympus (1.0 NA) objective. Unlike synaptic responses, calcium responses to laser pulses were stable over time, displaying no run down.
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